Abstract:
An apparatus and method for remotely adjusting the hydraulic horse power per square inch (HSI) of a drill bit. The apparatus and method may allow the nozzle geometry to be varied remotely without the need to pull the drill string outside the hole. This nozzle may include a body configured to be secured within the rotary drill bit, and a fluid passage within that body that leads to an orifice. The geometry of the fluid passage may be variable, and varying it may result in a change in the nozzle HSI; this may allow drilling different rock formations to be optimized in different drilling environments. Different placements of the nozzle, such as within the inner flow passage or between the inner flow passage and annular flow passage for controlling flow profile within a wellbore, a tubular string or a flow conduit, may be envisioned.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation-in-part application of U.S. patent application Ser. No. 13/846,946, filed Mar. 18, 2013, for APPARATUS AND METHOD TO REMOTELY CONTROL FLUID FLOW IN TUBULAR STRINGS AND WELLBORE ANNULUS, by Ahmed M. Tahoun, Raed I. Kafafy, Karam J Jawamir, Mohamed A. Aldheeb, Abdul M. Khalil, included by reference herein and for which benefit of the priority date is hereby claimed. 
     The present application is a continuation-in-part application of U.S. patent application Ser. No. 13/861,255, filed Apr. 11, 2013, for APPARATUS AND METHOD TO REMOTELY CONTROL FLUID FLOW IN TUBULAR STRINGS AND WELLBORE ANNULUS, by Ahmed M. Tahoun, Raed I. Kafafy, Karam J Jawamir, Mohamed A. Aldheeb, Abdul M. Khalil, included by reference herein and for which benefit of the priority date is hereby claimed. 
     The present application is a continuation-in-part application of U.S. provisional patent application, Ser. No. 61/648,575, filed May 17, 2012, for METHOD AND APPARATUS TO REMOTELY CHANGE THE AREA OF DRILL BIT NOZZLES AND DRILL STRING FLOW RESTRICTORS, by Ahmed M. Tahoun, Raed I. Kafafy, Karam J Jawamir, Mohamed A. Aldheeb, included by reference herein and for which benefit of the priority date is hereby claimed. 
     The present application is a continuation-in-part application of U.S. provisional patent application, Ser. No. 61/622,572, filed Apr. 11, 2012, for METHOD AND APPARATUS OF CONTROL DRILLING FLUID LOSSES AND IMPROVED HOLE CLEANING IN OIL &amp; GAS SUBTERRANEAN DRILLING OPERATIONS, by Ahmed M. Tahoun, Raed I. Kafafy, Karam J Jawamir, Mohamed A. Aldheeb, included by reference herein and for which benefit of the priority date is hereby claimed. 
     The present application is a continuation-in-part application of U.S. provisional patent application, Ser. No. U.S. 61/710,823, filed Oct. 19, 2012, for METHOD AND APPARATUS TO HARVEST ENERGY INSIDE WELLBORE FROM CHANGE OF FLUID FLOW RATE, by Ahmed M. Tahoun, Raed I. Kafafy, Karam J Jawamir, Mohamed A. Aldheeb, included by reference herein and for which benefit of the priority date is hereby claimed. 
     The present application is a continuation-in-part application of U.S. provisional patent application, Ser. No. U.S. 61/710,887, filed Oct. 8, 2012, for METHOD AND APPARATUS TO CONTROL THE MUD FLOW IN DRILL STRINGS AND WELLBORE ANNULUS, by Ahmed M. Tahoun, Raed I. Kafafy, Karam J Jawamir, Mohamed A. Aldheeb, included by reference herein and for which benefit of the priority date is hereby claimed. 
     The present application is related to U.S. Pat. No. 6,227,316B1, issued Mar. 10, 1999, for JET WITH VARIABLE ORIFICE NOZZLE, by Bruce A. Rohde, included by reference herein. 
     The present application is related to U.S. Pat. No. 3,120,284, issued Aug. 17, 1959, for JET NOZZLE FOR DRILL BIT, by J. S. Goodwin, included by reference herein. 
     The present application is related to U.S. Pat. No. 3,137,354, issued Jan. 11, 1960, for DRILL BIT NOZZLES, by A. W. Crawfort Et Al, included by reference herein. 
     The present application is related to U.S. Pat. No. 4,533,005, issued Nov. 21, 1983, for ADJUSTABLE NOZZLE, by Wilford V Morris, included by reference herein. 
     The present application is related to United States patent number US20100147594, issued Nov. 8, 2007, for REVERSE NOZZLE DRILL BIT, by Sadek Ben Lamin, included by reference herein. 
     The present application is related to United States patent number US20090020334, issued Jul. 16, 2008, for NOZZLES INCLUDING SECONDARY PASSAGE, DRILL ASSEMBLIES INCLUDING SAME AND ASSOCIATED METHOD, by David Gavia, included by reference herein. 
     The present application is related to United States patent number US20110000716, issued Dec. 15, 2009, for DRILL BIT WITH A FLOW INTERRUPTER, by Laurier E Comeau, included by reference herein. 
     The present application is related to U.S. Pat. No. 8,342,266, issued Mar. 15, 2011, for TIMED STEERING NOZZLE ON A DOWNHOLE DRILL BIT, by David R Hall, included by reference herein. 
    
    
     BACKGROUND 
     The concept of forming subterranean wells is referred to; a drill string is typically used to drill a wellbore of a first depth into the formation. 
     While drilling, a drilling fluid (ormud fluid) is circulated down through the tubular string, then through perforation(s) in a drill bit which is located at the end of the drill string. Then, the drilling fluid continues the circulation up through the annular flow passage between the outer perimeter of the tubular string and inner wall of the well. 
     The mud jets from the bit nozzles are normally directed toward the hole bottom and formation being drilled, with the velocities of several hundred feet per second to create turbulence which serves to clean the bit, as well as carry away the cut chips. The drill bit nozzles are removable flow-restrictors which determine the total area of the drill bit outlet, and therefore the terminal velocity of the mud jet. 
     The majority of drilling systems in current use include a heavy tubular string with a substantially large outer diameter, and a Bottom Hole Assembly (BHA) linked to that tubular string and located below it. The BHA may include the drill bit, as well as other equipment such as motors, logging while drilling equipment, directional drilling control systems, or any combination thereof. Above the BHA, there normally extend smaller drill pipes connecting the BHA to the surface. 
     When drilling in earth formations having rapid variations in mechanical properties between layers, the drill bit nozzle hydraulic horse power per square inch (HSI) can be too high for the formation, resulting in the formation being overdrilled, or can be too low for the formation, which results in less efficient removal of cuttings. 
     Conventionally, the drill bit nozzle lowered in the wellbore has a fixed flow geometry and total flow area (TFA). It is not possible to change to another nozzle geometry except through pulling the tubular string out of the wellbore. 
     Flow restrictors used within a tubular string during drilling, for example for the mud motor, may have a fixed geometry connecting between the inner flow passage and the annular flow passage. It is desirable to be able to change the flow restrictor flow geometry without the need to pull the tubular string out of the hole. 
     Flow restrictors exist in other components of the tubular string used for drilling or conduits used for flow of fluid in certain industries (like the oil and gas industry, or other industries at large) that communicate fluid from one point to another. Changing the geometry of flow restrictors remotely is desirable. 
     The majority of drilling systems used today use drill bit nozzles with fixed total flow area (TFA). One way to change the drill bit nozzle HSI is to change the mud flow rate through the whole drilling string, i.e. reduce mud circulation flow rate or increase the flow rate from the optimum flow rate. 
     Another way to change nozzle Total Flow Area (TFA) of the drill bit or other flow restrictor disposed within the conduit is to pull out the tubular string from the wellbore and replace the nozzle with another of the desired TFA. 
     A previously-described adjustable geometry nozzle requires the operator to pull the string out of the wellbore. 
     Changing mud flow rate from the optimum to adjust the HSI requires reducing mud circulation flow rate or increasing the flow rate from the optimum flow rate. This results in undesired annular flow velocity which causes deterioration in the hole cleaning efficiency through increase of suspended solids or cuttings within the wellbore or causing a washout when formation or other undesirable acts. 
     Pulling out the tubular string from the wellbore to replace the nozzle with another of the desired TFA cost the operator significant time and money and increase drilling risks. 
     One aspect of the current invention is to introduce methods and apparatus to remotely change the geometry of a drill bit nozzle which allows to adjust the HSI of the nozzle while maintaining optimum flow rate. Another aspect of the present invention is to introduce an apparatus and method for remotely and selectively changing flow profile within the tubular string or between the tubular string inner flow passage and annular flowpassage. 
     Maintenance of annular velocity and the introduction of adjustable TFA drill bit nozzles using the current invention will reduce the operating cost and risks associated with suspended solids or cuttings as well as risks associated with possible formation collapse. 
     Drill bit nozzles are made of fixed size, therefore drill bit manufacturers provide different drill bit designs with alternative number of nozzles and sizes. A typical nozzle (shown in  FIG. 3 ) is inserted into an aperture, and is held in place by any one of several means, such as a snap ring, screw threads, or a nail lock. The inner diameter of the nozzle outlet is approximately equal to the opening above which. The final outlet internal diameter of the nozzle is measured in increments of 1/32 of an inch. To adjust the flow, the nozzle has to be replaced with another nozzle which has a different outlet inner diameter. 
     Replacing a drill bit nozzle requires pulling the drill string out of the hole (POH) which retards drilling operation and multiplies drilling cost. The size of nozzle needed cannot be determined in advance due to the many factors affecting nozzle sizing. Therefore, drill bits are commonly shipped off-shore with several nozzles with different sizes for each aperture. At the drilling site, the correct-size nozzle is installed whereas unused nozzles are normally discarded or lost which increases the cost and time of drilling. 
     In a more recently disclosed invention, a drill bit nozzle with adjustable orifice is proposed (shown in  FIG. 4A ). This design allows the same nozzle to deliver the mud at variable pressures. This is accomplished by the use of two thick plates, each having a shaped aperture therein. The degree to which the two apertures are overlapped determines the size of the orifice. The movement of at least one of the plates, and thus the size of the orifice, can be adjusted at the drill site, to give a desired pressure drop across the nozzle. 
     SUMMARY 
     In one example, disclosed is a nozzle adapted for use in a rotary drill bit for drilling a n earth borehole based on changing the environment in the borehole, the nozzle including: a body configured to be secured within the rotary drill bit, at least one fluid passage of variable geometry through the body for connecting a fluid through the body, an orifice disposed within the body, in fluid communication with the at least one fluid passage and the borehole, a means for changing the geometry of the at least one fluid passage having at least one movable element, in fluid communication with the fluid passage and the orifice, the at least one movable element is movable from an initial position to at least one other predetermined position in response to intended changes in the borehole environment. 
     In one example, the at least one moveable element is movable from an initial position to another predetermined position under normal fluid circulation (from the drill bit to the borehole), and the at least one moveable element is movable from an initial position to a different predetermined position under reverse fluid circulation (from the borehole to the drill bit). 
     In one example, the at least one moveable element is rotatable to a plurality of predetermined positions. 
     In one example, disclosed is an apparatus for remotely changing flow profile in conduit and rotary drill bit based on changing the environment in the borehole, the apparatus including: (a) a nozzle adapted for use in a rotary drill bit for drilling an earth borehole, the nozzle including: a body configured to be secured within the rotary drill bit, at least one fluid passage of variable geometry through the body for connecting a fluid through the body, an orifice disposed within the body, in fluid communication with the at least one fluid passage and the borehole, a means for changing the geometry of the at least one fluid passage having at least one movable element, in fluid communication with the fluid passage and the orifice, wherein the at least one movable element is movable from an initial position to at least one other predetermined position in response to intended changes in the borehole environment; (b) at least one means for detecting a plurality of intended changes in at least one physical property of the borehole environment resulting in a detectable signal within the apparatus for processing the signal; (c) a means for actuating the means for changing the geometry of the at least one fluid passage; and (d) a means for powering the means for actuating the at least movable element. 
     In one example, the at least one detecting means comprises a sensor. 
     In one example, the actuating means comprises an electric motor. 
     In one example, the actuating means comprises a movable rack, the rack mechanically engaged with the at least one movable element. 
     In one example, the powering means comprises an energy harvester. 
     In one example, the energy harvester is set to receive hydraulic energy from fluid flow in the tubular string and is configured to provide electrical energy to the means for actuating. 
     In one example, the energy harvester is set to receive hydraulic energy from a fluid pressure difference between the inner fluid passage and the wellbore fluid. 
     In one example, the energy harvester is set to receive thermal energy from a temperature difference between two points within the drill bit and is configured to provide electrical energy to the means for actuating. 
     In one example, the powering means comprises an energized resilient element. 
     In one example, the powering means comprises a battery. 
     In one set of examples, disclosed is a method for drilling an earth borehole based on changing the environment in the borehole, the method including: (a) disposing in a wellbore a drill bit attached to a tubular string, the drill bit including an apparatus, the apparatus comprising: a nozzle adapted for use in a rotary drill bit for drilling an earth borehole, the nozzle comprising: a body configured to be secured within the rotary drill bit, at least one fluid passage of variable geometry through the body for connecting a fluid through the body, an orifice disposed within the body, in fluid communication with the at least one fluid passage and the borehole, a means for changing the geometry of the at least one fluid passage having at least one movable element, in fluid communication with the fluid passage and the orifice, the at least one movable element is movable from an initial position to at least one other predetermined position in response to intended changes in the borehole environment; at least one means for detecting a plurality of intended changes in at least one physical property of the borehole environment resulting in a detectable signal within the apparatus for processing the signal; a means for actuating the means for changing the geometry of the at least one fluid passage; a means for powering the means for actuating the at least movable element; (b) causing a change in at least one physical property within the borehole environment in certain sequence within a specified period of time resulting in a detectable pattern at the at least one detecting means; and (c) causing the actuating means to use the energy provided by the powering means to change the geometry of the at least one fluid passage within the nozzle. 
     In one example, the change in a physical property of the environment is a mechanical movement of the apparatus by means of moving the tubular string, causing the apparatus to move within the wellbore in at least one direction detectable by the detecting means. 
     In one example, the change of physical property includes a change in one or more of the following fluid properties: pressure, temperature, flow rate, density, viscosity, color, and composition, detectable by the detecting means. 
     In one example, the change in a physical property includes a change in one or more of the following physical properties: electromagnetic, electrostatic, and seismic, detectable by the detecting means. 
     In one example, changing the geometry of the at least one fluid passage includes reducing the area of the nozzle orifice to increase the velocity of the nozzle jet. 
     In one example, changing the geometry of the at least one fluid passage includes increasing the area of the nozzle orifice to decrease the velocity of the nozzle jet. 
     In one example, the change of physical property includes a change in the direction of flow circulation. 
     In one example, changing the geometry of the at least one fluid passage includes moving the at least one movable element from a first position to a second position when the flow is circulated in one direction and moving the at least one movable element from the second position to the first position when the flow is circulated in the opposite direction. 
     In one example, the apparatus may further include a cam and a latch to hold the at least one movable element in a position resulting in the desired change of the geometry of the at least one fluid passage and allowing the flow circulation to be changed. 
     In one example, the actuating means includes an actuator selected from at least one of a rack-type actuator, an electric motor, a solenoid, and a cam-type actuator. 
     In one example, the rack-type actuator includes at least one rack, and actuating the means for changing the geometry of the at least one fluid passage includes moving the rack between a first position and a second position. 
     In one example, the powering means includes a power source selected from at least one of a hydraulic power, an energized resilient element, a battery, a super capacitor, and an energy harvester. 
     In one example, the energy harvester is selected from at least one of an electromagnetic induction harvester, a piezoelectric harvester, and a thermoelectric harvester. 
     In one example, the hydraulic power includes creating a net pressure force on the surfaces of the movable element exposed to the fluid passing through the nozzle. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A complete understanding of the present invention may be obtained by reference to the accompanying drawings, when considered in conjunction with the subsequent, detailed description, in which: 
         FIG. 1  is a section view of a possible embodiment of a wellbore drilling system wherein a plurality of the fluid flow control apparatus are disposed within drilling tubular string; 
         FIG. 2  is a bottom view of an example of drill bit comprises at least one nozzle port; 
         FIG. 3  is a section view of a drill bit with conventional nozzle disposed in one port; 
         FIG. 4A  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4B  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4C  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4D  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4E  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4F  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4G  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 4H  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5A  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5B  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5C  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5D  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5E  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5F  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5G  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 5H  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 6A  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 6B  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 6C  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 6D  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 7A  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7B  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7C  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7D  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7E  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7F  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7G  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7H  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7I  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7J  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7K  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7L  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7M  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7N  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7O  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7P  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7Q  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7R  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7S  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 7T  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element having different shapes of movable element geometry orifice in different positions; 
         FIG. 8A  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8B  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8C  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8D  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8E  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8F  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8G  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8H  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8I  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8J  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8K  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 8L  is a detail view of a possible configuration of a variable geometry nozzle having one movable geometry element in different positions; 
         FIG. 9A  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9B  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9C  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9D  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9E  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9F  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9G  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9H  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9I  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9J  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9K  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 9L  is a detail view of a possible configuration of a variable geometry nozzle having two movable geometry elements in different positions; 
         FIG. 10A  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10B  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10C  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10D  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10E  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10F  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10G  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10H  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10I  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10J  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10K  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 10L  is a detail view of a possible configuration of a variable geometry nozzle having three movable geometry elements in different positions; 
         FIG. 11A  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 11B  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 11C  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 11D  is a detailed section view of one of an example set of possible configurations of a variable geometry nozzle showing a movable element in different positions; 
         FIG. 12A  is a partial cut out view of one of an example set of possible configurations of variable geometry nozzles showing a movable element in different positions; 
         FIG. 12B  is a partial cut out view of one of an example set of possible configurations of variable geometry nozzles showing a movable element in different positions; 
         FIG. 12C  is a partial cut out view of one of an example set of possible configurations of variable geometry nozzles showing a movable element in different positions; 
         FIG. 13A  is a detailed section view of an example of a possible configuration of a variable geometry nozzle showing movable elements in different positions and a restrictive element disposed within the nozzle body; 
         FIG. 13B  is a detailed section view of an example of a possible configuration of a variable geometry nozzle showing movable elements in different positions and a restrictive element disposed within the nozzle body; 
         FIG. 13C  is a detailed section view of an example of a possible configuration of a variable geometry nozzle showing movable elements in different positions and a restrictive element disposed within the nozzle body; 
         FIG. 14A  is a section view of an example of a variable geometry nozzle showing a movable element in different positions under the effect of a change of fluid flow direction; 
         FIG. 14B  is a section view of an example of a variable geometry nozzle showing a movable element in different positions under the effect of a change of fluid flow direction; 
         FIG. 14C  is a section view of an example of a variable geometry nozzle showing a movable element in different positions under the effect of a change of fluid flow direction; 
         FIG. 14D  is a section view of an example of a variable geometry nozzle showing a movable element in different positions under the effect of a change of fluid flow direction; 
         FIG. 15A  is a section view of an example of a variable geometry nozzle using a cam to change passage geometry through a cycling movement; 
         FIG. 15B  is a section view of an example of a variable geometry nozzle using a cam to change passage geometry through a cycling movement; 
         FIG. 15C  is a section view of an example of a variable geometry nozzle using a cam to change passage geometry through a cycling movement; 
         FIG. 15D  is a section view of an example of a variable geometry nozzle using a cam to change passage geometry through a cycling movement; 
         FIG. 16A  is a detail view of a possible disposition of a variable geometry nozzle in a drilling bit or drilling tubular conduit; 
         FIG. 16B  is a detail view of a possible disposition of a variable geometry nozzle in a drilling bit or drilling tubular conduit; 
         FIG. 16C  is a detail view of a possible disposition of a variable geometry nozzle in a drilling bit or drilling tubular conduit; 
         FIG. 16D  is a detail view of a possible disposition of a variable geometry nozzle in a drilling bit or drilling tubular conduit; and 
         FIG. 17  is a diagram depicting steps used for the method of remotely controlling the variable geometry nozzle. 
     
    
    
     For purposes of clarity and brevity, like elements and components will bear the same designations and numbering throughout the Figures. 
     DETAILED DESCRIPTION 
     U.S. Provisional Application No. 61/710,887, filed Oct. 8, 2012 for METHOD AND APPARATUS TO CONTROL THE MUD FLOW IN DRILL STRINGS AND WELLBORE ANNULUS 156, by Ahmed TAHOUN, Raed Kafafy, Karam Jawamir, Mohamed Aldheeb, Abdul Mushawwir Mohamad Khalil is herein incorporated by reference in its entirety. 
     U.S. Provisional Application No. 61/622,572, filed Apr. 11, 2012 for METHOD AND APPARATUS OF CONTROL DRILLING FLUID LOSSES AND IMPROVED HOLE CLEANING IN OIL &amp; GAS SUBTERRANEAN DRILLING OPERATIONS, by Ahmed Moustafa Tahoun is herein incorporated by reference in its entirety. 
     U.S. Provisional Application No. 61/710,823, filed Oct. 8, 2012 for METHOD AND APPARATUS TO HARVEST ENERGY INSIDE WELLBORE 100 FROM CHANGE OF FLUID FLOW RATE, by Ahmed M. Tahoun, Raed I. Kafafy, Karam Jawamir, Mohamed A. Aldheeb, Abdul M. Khalil is herein incorporated by reference in its entirety. U.S. Provisional Application No. 61/648,575, filed May 17, 2012 for Method and Apparatus to remotely change the area of drill bit 120 nozzles and drill string flow restrictors, by Ahmed M. Tahoun, Raed I. Kafafy, Karam Jawamir, Mohamed A. Aldheeb is herein incorporated by reference in its entirety. 
     U.S. application Ser. No. 13/846,946, filed Mar. 18, 2013 for Apparatus and method to remotely control fluid flow in tubular strings and wellbore annulus 156, by Ahmed M. Tahoun, Raed I. Kafafy, Karam Jawamir, Mohamed A. Aldheeb, Abdul M Khalil is herein incorporated by reference in its entirety. U.S. application Ser. No. 13/861,255, filed Apr. 11, 2013 for Apparatus and method to remotely control fluid flow in tubular strings and wellbore annulus 156, by Ahmed M. Tahoun, Raed I. Kafafy, Karam Jawamir, Mohamed A. Aldheeb, Abdul M Khalil is herein incorporated by reference in its entirety. 
       FIG. 1  is a section view of an example of a wellbore  100  drilling system wherein a plurality of the variable geometry nozzle  150  are disposed within the drilling tubular string  110  during the well forming operation. The majority of drilling systems used in current days include a tubular string  110  composed of a drill bit  120  having at least one perforation  125  located through the drill bit  120  to allow fluid flow therethrough. A heavy tubular with a bigger outer diameter, among other equipment such as mud motors or logging while drilling equipment or directional drilling control systems, or any combination thereof, that may be referred to as a bottom hole assembly  130  may be connected to the drill bit  120  from one end. Bottom hole assembly  130  is normally connected in the form of a thread from the other end to another tubular string  110 , such as a drill pipe  140  connecting the bottom hole assembly  130  to the surface. The drill pipe  140  outer diameter is commonly known to be smaller when compared to the bottom hole assembly  130 . A plurality of variable geometry nozzles  150  disposed within the wellbore  100  are connected to a portion of the tubular string  110  by a suitable means, normally a form of thread. The wellbore  100  formed into the earth may have a deviated section where the wellbore  100  is not vertical. A cased hole section is the portion of the wellbore  100  having a tubular of large diameter, called casing, lining the inner side of the wellbore  100  to protect wellbore  100  from damage. While drilling a deeper section into earth formations an open hole section of the wellbore  100  is formed. A surface mud pump system  190  is disposed with most drilling operations and includes a drilling fluid tank to store drilling fluid and a pump  192  to force fluid into the inner flow passage  152 , defined as the inner space within the tubular string  110 . Cuttings generated from hole making are carried out through the annular flow passage  154 . An annular flow passage  154  is defined as the space between the inner wall of the wellbore  100  and the outer wall of the tubular string  110 . The variable geometry nozzle  150  is disposed inside perforation  125  or an opening within the drill bit  120 . 
       FIG. 2  is a bottom view of a typical drill bit  120  used in modern drilling activity. Drill bit  120  comprises a drill bit body  122 , one or more bit cutters  835  disposed on a bit outer surface and attached to at least one bit blade  840  suitably arranged to perform the cutting action when made to interact with an earth formation during a drilling operation. One or more perforations  125  is disposed on the bit body  200  in communication between the inner flow passage  152  and the annular flow passage  154 . A flow restrictor, commonly known as bit nozzle is normally disposed within the bit perforation  125 . In one example at least one variable geometry nozzle  150  is disposed in bit perforation  125 . 
       FIG. 3  is a section view of a drill bit  120  with conventional nozzle  135  disposed in one perforation  125  within drill bit body  122  connecting inner flow passage  152  to the annular flow passage  154 . The conventional nozzle  135  has a fixed geometry and cannot be changed except when brought out to surface. 
     Referring generally to  FIGS. 4A-4H ,  FIGS. 4A-4H  are detailed section views of an example set of possible configurations of a variable geometry nozzle  150  showing a movable element  400  in different positions. 
       FIG. 4A  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. 
       FIG. 4B  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 4A  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 4A . 
       FIG. 4C  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a resilient element  405  is attached to the movable element  400  causing it to be biased in specific direction. 
       FIG. 4D  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 4C  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 4C . 
       FIG. 4E  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a suitable cam  420  similar to those explained in U.S. patent application Ser. Nos. 13/846,946 and 13/861,255, is attached to the movable element  400 . A cam follower  415  disposed within the body  200  traverse the cam track  410  disposed on the cam  420  surface to control the movement of the movable element  400  and restrict it to certain distance and in certain direction. 
       FIG. 4F  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 4E  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 4E . 
       FIG. 4G  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a resilient element  405  is attached to the movable element  400  causing it to be biased in specific direction and a suitable cam  420  similar to those explained in U.S. patent application Ser. Nos. 13/846,946 and 13/861,255 is attached to the movable element  400 . A cam follower  415  disposed within the body  200  traverse the cam track  410  disposed on the cam  420  surface to control the movement of the movable element  400  and restrict it to certain distance and in certain direction.  FIG. 4H  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 4G  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 4G . 
     Referring generally to  FIGS. 5A-5H ,  FIGS. 5A-5H  are detailed section views of an example set of possible configurations of a variable geometry nozzle  150  showing a movable element  400  in different positions. In this set of examples a movement communication duct  430  is disposed within the body  200  in fluid communication on one side with the movable element  400  and on another side in communication with the inner flow passage  152 . 
       FIG. 5A  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a movement communication duct  430  is disposed within the body  200  in fluid communication on one side with the movable element  400  and on another side in communication with the inner flow passage  152 . 
       FIG. 5B  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 5A  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 5A . 
       FIG. 5C  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a resilient element  405  is attached to the movable element  400  causing it to be biased in specific direction. In this example a movement communication duct  430  is disposed within the body  200  in fluid communication on one side with the movable element  400  and on another side in communication with the inner flow passage  152 . 
       FIG. 5D  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 5C  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 5C . 
       FIG. 5E  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a suitable cam  420  similar to those explained in U.S. patent application Ser. Nos. 13/846,946 and 13/861,255 is attached to the movable element  400 . A cam follower  415  disposed within the body  200  traverse the cam track  410  disposed on the cam  420  surface to control the movement of the movable element  400  and restrict it to certain distance and in certain direction. In this example a movement communication duct  430  is disposed within the body  200  in fluid communication on one side with the movable element  400  and on another side in communication with the inner flow passage  152 . 
       FIG. 5F  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 5E  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 5E . 
       FIG. 5G  is a section view of one example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  in one position where the flow geometry  440  generated by interaction of the movable element  400  and the inner flow passage  152  is of specific geometry when the movable element  400  is in this position. The inner flow passage  152  is connected to the orifice  425  through a downstream passage  800 . The downstream passage  800  is the location within the variable geometry nozzle  150  where the movable element  400  interact with inner flow passage  152  causing a change in the inner flow passage  152  geometry and causing the variable geometry nozzle  150  to have a specific flow geometry  440  and specific to the movable element  400  shape. In this example a resilient element  405  is attached to the movable element  400  causing it to be biased in specific direction and a suitable cam  420  similar to those explained in U.S. patent application Ser. Nos. 13/846,946 and 13/861,255, is attached to the movable element  400 . A cam follower  415  disposed within the body  200  traverse the cam track  410  disposed on the cam  420  surface to control the movement of the movable element  400  and restrict it to certain distance and in certain direction. In this example a movement communication duct  430  is disposed within the body  200  in fluid communication on one side with the movable element  400  and on another side in communication with the inner flow passage  152 . 
       FIG. 5H  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 5G  where the movable element  400  is in a different position interacting with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 5G . 
     Referring generally to  FIGS. 6A-6D ,  FIGS. 6A-6D  are detailed section views of an example set of possible configurations of a variable geometry nozzle  150  showing a movable element  400  in different positions. 
       FIG. 6A  is an example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  having plurality of movable element geometry orifice  435 ( s ) in one position; similar to those explained in U.S. Patent application Ser. Nos. 13/846,946 and 13/861,255 is attached to the movable element  400 . A cam follower  415  disposed within the body  200  traverse the cam track  410  disposed on the cam  420  surface to control the movement of the movable element  400  and restrict it to certain distance and in certain direction. In this example the movable element  400  is in a specific position such that at least one movable element geometry orifice  435  is in fluid communication with the inner flow passage  152  from one side and the orifice  425  on another side resulting in a specific flow geometry  440  of the downstream passage  800 . 
       FIG. 6B  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 6A  where the movable element  400  is in a different position interacting with the inner flow passage  152  such that a different movable element geometry orifice  435  is in communication with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 5A . 
       FIG. 6C  is an example of the variable geometry nozzle  150  comprising a body  200 , a movable element  400  disposed within the body  200  having plurality of movable element geometry orifice  435 ( s ) in one position; similar to those explained in U.S. patent application Ser. Nos. 13/846,946 and 13/861,255 is attached to the movable element  400 . A cam follower  415  disposed within the body  200  traverse the cam track  410  disposed on the cam  420  surface to control the movement of the movable element  400  and restrict it to certain distance and in certain direction. In this example the movable element  400  is in specific position such that at least one movable element geometry orifice  435  is in fluid communication with the inner flow passage  152  from one side and the orifice  425  on another side resulting in a specific flow geometry  440  of the downstream passage  800 . In this example a resilient element  405  is attached to the movable element  400  causing it to be biased in specific direction. In another example, the resilient element  405  is arranged from the side in connection with the movable element  400  such that at least one movable element geometry orifice  435  is restricted from communication with the inner flow passage  152 . 
       FIG. 6D  is a section view of one example of the variable geometry nozzle  150  explained in the description of  FIG. 6C  where the movable element  400  is in a different position interacting with the inner flow passage  152  such that a different movable element geometry orifice  435  is in communication with the inner flow passage  152  causing a change of the flow passage geometry when compared to the flow passage geometry of  FIG. 5C . 
     Referring generally to  FIGS. 7A-7T ,  FIGS. 7A-7T  are detailed section views of an example set of possible configurations of a variable geometry nozzle  150  showing a movable element  400  having different shapes of movable element geometry orifice  435  in different positions. 
       FIG. 7A  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in one position shown in the cross section view described in  FIG. 7B . 
       FIG. 7B  is a section view of an example set of possible configurations of variable geometry nozzle  150  showing movable element  400  having a movable element geometry orifice  435  in one position such that inner flow passage  152  is in free communication with the orifice  425  through the downstream passage  800 . 
       FIG. 7C  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in a different position described in  FIG. 7D  showing a restricted downstream passage 
       FIG. 7D  is a section view of the variable geometry nozzle  150  described in  FIG. 7B  wherein the movable element  400  is in different position when compared to the position described in  FIG. 7B . In this figure the downstream passage  800  is restricted due to the shape of the movable element  400  flow orifice  425  and the interaction of the movable element  400  with the inner flow passage  152  in this position. 
       FIG. 7E  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in one position shown in the cross section view described in  FIG. 7F . 
       FIG. 7F  is a section view of an example set of possible configurations of variable geometry nozzle  150  showing movable element  400  having a movable element geometry orifice  435  in one position such that inner flow passage  152  is in free communication with the orifice  425  through the downstream passage  800 . 
       FIG. 7G  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in a different position described in  FIG. 7H  showing a restricted downstream passage. 
       FIG. 7H  is a section view of the variable geometry nozzle  150  described in  FIG. 7F  wherein the movable element  400  is in different position when compared to the position described in  FIG. 7F . In this figure the downstream passage  800  is having a shape of two rounded openings wherein the movable element  400  flow orifice  425  ( s ) are in communication with the inner flow passage  152  on one side and to the orifice  425  on the other side. 
       FIG. 7I  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in one position shown in the cross section view described in  FIG. 7J . 
       FIG. 7J  is a section view of an example of a possible configurations of variable geometry nozzle  150  showing movable element  400  having a movable element geometry orifice  435  in one position such that inner flow passage  152  is in free communication with the orifice  425  through the downstream passage  800 . 
       FIG. 7K  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in a different position described in  FIG. 7L  showing a restricted downstream passage. 
       FIG. 7L  is a section view of the variable geometry nozzle  150  described in  FIG. 7J  wherein the movable element  400  is in different position when compared to the position described in  FIG. 7J . In this figure the downstream passage  800  is having a shape of three rounded openings wherein the movable element  400  flow orifice  425  ( s ) are in communication with the inner flow passage  152  on one side and to the orifice  425  on the other side. 
       FIG. 7M  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in one position shown in the cross section view described in  FIG. 7N . 
       FIG. 7N  is a section view of an example of a possible configurations of variable geometry nozzle  150  showing movable element  400  having a movable element geometry orifice  435  in one position such that inner flow passage  152  is in free communication with the orifice  425  through the downstream passage  800 . 
       FIG. 7O  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in a different position described in  FIG. 7P  showing a restricted downstream passage  800 . 
       FIG. 7P  is a section view of the variable geometry nozzle  150  described in  FIG. 7N  wherein the movable element  400  is in different position when compared to the position described in  FIG. 7N . In this figure the downstream passage  800  is having a shape of curved opening wherein the movable element  400  flow orifice  425  is in communication with the inner flow passage  152  on one side and to the orifice  425  on the other side. 
       FIG. 7Q  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in one position shown in the cross section view described in  FIG. 7R . 
       FIG. 7R  is a section view of an example of a possible configurations of variable geometry nozzle  150  showing movable element  400  having a movable element geometry orifice  435  in one position such that inner flow passage  152  is in free communication with the orifice  425  through the downstream passage  800 . 
       FIG. 7S  is a side view of the variable geometry nozzle  150  wherein the movable element  400  is in a different position described in  FIG. 7T  showing a restricted downstream passage. 
       FIG. 7T  is a section view of the variable geometry nozzle  150  described in  FIG. 7R  wherein the movable element  400  is in different position when compared to the position described in  FIG. 7R . In this figure the downstream passage  800  is having a shape of an opening having at least one straight side wherein the movable element  400  flow orifice  425  is in communication with the inner flow passage  152  on one side and to the orifice  425  on the other side. 
     Referring generally to  FIGS. 8A-8L ,  FIGS. 8A-8L  are detailed section views of an example of the variable geometry nozzle  150  wherein the movable element  400  has a curved surface and moves partially in rotation causing the change of downstream flow geometry  440 . 
       FIG. 8A  is a front view of a partial cutaway example of the variable geometry nozzle  150  having one movable element  400  in one position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  interacting with the inner flow passage  152  when it is in this position. 
       FIG. 8B  is a partial section view of the variable geometry nozzle  150  described in  FIG. 8A  wherein the movable element  400  is not cut away in view. 
       FIG. 8C  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 8A  wherein the movable element  400  is not cut away in view. 
       FIG. 8D  is a section view of the variable geometry nozzle  150  described in  FIG. 8A . 
       FIG. 8E  is a front view of a partial cutaway example of the variable geometry nozzle  150  having one movable element  400  in a second position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  interacting with the inner flow passage  152  when it is in this position. 
       FIG. 8F  is a partial section view of the variable geometry nozzle  150  described in  FIG. 8E  wherein the movable element  400  is not cut away in view. 
       FIG. 8G  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 8E  wherein the movable element  400  is not cut away in view. 
       FIG. 8H  is a section view of the variable geometry nozzle  150  described in  FIG. 8E . 
       FIG. 8I  is a front view of a partial cutaway example of the variable geometry nozzle  150  having one movable element  400  in a third position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  interacting with the inner flow passage  152  when it is in this position. 
       FIG. 8J  is a partial section view of the variable geometry nozzle  150  described in  FIG. 8I  wherein the movable element  400  is not cut away in view. 
       FIG. 8K  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 8I  wherein the movable element  400  is not cut away in view. 
       FIG. 8L  is a section view of the variable geometry nozzle  150  described in  FIG. 8I . 
     Referring generally to  FIGS. 9A-9L ,  FIGS. 9A-9L  are detailed section views of an example of the variable geometry nozzle  150  wherein two movable element  400  ( s ) are disposed within the body  200  and are having a curved surface and move partially in rotation causing the change of downstream flow geometry  440 . 
       FIG. 9A  is a front view of a partial cutaway example of the variable geometry nozzle  150  having two movable element  400  ( s ) in one position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position. 
       FIG. 9B  is a partial section view of the variable geometry nozzle  150  described in  FIG. 9A  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 9C  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 9A  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 9D  is a section view of the variable geometry nozzle  150  described in  FIG. 9A . 
       FIG. 9E  is a front view of a partial cutaway example of the variable geometry nozzle  150  having two movable element  400  ( s ) in a second position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position. 
       FIG. 9F  is a partial section view of the variable geometry nozzle  150  described in  FIG. 9E  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 9G  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 9E  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 9H  is a section view of the variable geometry nozzle  150  described in  FIG. 9E . 
       FIG. 9I  is a front view of a partial cutaway example of the variable geometry nozzle  150  having two movable element  400  ( s ) in a third position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position. 
       FIG. 9J  is a partial section view of the variable geometry nozzle  150  described in  FIG. 9I  wherein the movable element  400  ( s ) is not cut away in view. 
       FIG. 9K  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 9I  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 9L  is a section view of the variable geometry nozzle  150  described in  FIG. 9I . 
     Referring generally to  FIGS. 10A-10L ,  FIGS. 10A-10L  are detailed section views of an example of the variable geometry nozzle  150  wherein a plurality of movable element  400  ( s ) are disposed within the body  200  and have a curved surface and move partially in rotation causing the change of downstream flow geometry  440 . 
       FIG. 10A  is a front view of a partial cutaway example of the variable geometry nozzle  150  having plurality movable element  400  ( s ) in one position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position. 
       FIG. 10B  is a partial section view of the variable geometry nozzle  150  described in  FIG. 10A  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 10C  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 10A  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 10D  is a section view of the variable geometry nozzle  150  described in  FIG. 10A . 
       FIG. 10E  is a front view of a partial cutaway example of the variable geometry nozzle  150  having two movable element  400  ( s ) in a second position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position. 
       FIG. 10F  is a partial section view of the variable geometry nozzle  150  described in  FIG. 10E  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 10G  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 10 -B- 1  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 10H  is a section view of the variable geometry nozzle  150  described in  FIG. 10E . 
       FIG. 10I  is a front view of a partial cutaway example of the variable geometry nozzle  150  having two movable element  400  ( s ) in a third position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position. 
       FIG. 10J  is a partial section view of the variable geometry nozzle  150  described in  FIG. 10I  wherein the movable element  400  ( s ) is not cut away in view. 
       FIG. 10K  is a partial section view from a tilted angle of the variable geometry nozzle  150  described in  FIG. 10I  wherein the movable element  400  ( s ) are not cut away in view. 
       FIG. 10L  is a section view of the variable geometry nozzle  150  described in  FIG. 10I . 
     Referring generally to  FIGS. 11A-11D ,  FIGS. 11A-11D  are detailed section views of an example of the variable geometry nozzle  150  where the movable element  400  is having at least one spherical surface and is biased by a resilient element  405  in connection between the movable element  400  and the body  200 . The movable element  400  is placed such that it interact with the inner flow passage  152  when in different positions causing the downstream passage  800  to have different geometry. 
       FIG. 11A  and  FIG. 11B  are showing the movable element  400  in two different positions with the downstream passage  800  in  FIG. 11B  is of more restricted geometry when compared to the downstream passage  800  of  FIG. 11A . 
       FIG. 11C  and  FIG. 11D  are similar to  FIG. 11A  and  FIG. 11B  except that the downstream passage  800  of  FIGS. 11C and 11D  are of larger area caused by the placement of flow enlargement conduit  845  permanently in communication between the inner flow passage  152  and the orifice  425 . 
     Referring generally to  FIGS. 12A-12C ,  FIGS. 12A-12C  are detailed section views of an example of the variable geometry nozzle  150  wherein a plurality of movable element  400  ( s ) are disposed within the body  200  and move partially axially guided by a guide surface  850  disposed within the body  200  and while in contact with at least one of the movable element  400  ( s ) at least one time when the movable element  400  is traversing its travel pass. The guided movement causes the change of downstream flow geometry  440 . 
       FIG. 12A  is a partial cut away view of an example of the variable geometry nozzle  150  having plurality movable element  400  ( s ) in one position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position and guided by the guide surface  850 . 
       FIG. 12B  is a partial cut away view of an example of the variable geometry nozzle  150  having plurality movable element  400  ( s ) in a second position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position and guided by the guide surface  850 . The downstream passage  800  is having a less flow area in this position when compared to the flow area of the downstream passage  800  of  FIG. 12A . 
       FIG. 12C  is a partial cut away view of an example of the variable geometry nozzle  150  having plurality movable element  400  ( s ) in a second position such that the inner flow passage  152  is in communication with the orifice  425  through the downstream passage  800  wherein the downstream passage  800  geometry is of specific geometry generated by the movable element  400  ( s ) interacting with the inner flow passage  152  when it is in this position and guided by the guide surface  850 . The downstream passage  800  is having a less flow area In this position when compared to the flow area of the downstream passage  800  of  FIG. 12B . 
     Referring generally to  FIGS. 13A-13C ,  FIGS. 13A-13C  are detailed section views of an example of the variable geometry nozzle  150  explained in  FIGS. 8, 9 and 10  having a restricting pin to prevent undesired movement of the movable element  400 . Enough force has to be exerted on the pin by the movable element  400  caused by a driving member to break the pin and allow for the movable element  400  to change position. 
       FIG. 13A  is a section view of one example of the variable geometry nozzle  150  having a driving member in a form of a threaded rack  810  engaged with a matching threaded groves on the movable element  400  surface such that when the rack  810  moves in certain direction it exerts a force on the pinion  815  in connection with the movable element  400 . When this force exceed a value set to break the restriction pin  805 , then the pin will break and the movable element  400  will move in partial rotation in response to the movement of the rack  810 . 
       FIG. 13B  is a section view of one example of the variable geometry nozzle  150  described in  FIG. 13A  wherein the movable element  400  ( s ) are in different position when compared to the position in  FIG. 13A  and the downstream geometry is accordingly different from the downstream geometry generated by the movable element  400  in  FIG. 13A . 
       FIG. 13C  is a section view of one example of the variable geometry nozzle  150  described in  FIG. 13B  wherein the movable element  400  ( s ) are in different position when compared to the position in  FIG. 13B  and the downstream geometry is accordingly different from the downstream geometry generated by the movable element  400  in  FIG. 13B . 
     Referring generally to  FIGS. 14A-14D ,  FIGS. 14A-14D  are detailed section views of an example of the variable geometry nozzle  150  described in  FIGS. 5A-5H  wherein the movable element movement direction  825  is controlled by the circulation pattern under the effect of the fluid flow direction  820 . 
       FIG. 14A  showing the effect of fluid flow from the orifice  425  towards the inner flow passage  152  in what is known in the industry as reverse circulation. This flow direction  820  forces the movable element  400  away from the inner flow passage  152  and resulting in a downstream passage  800  of specific geometry. 
       FIG. 14B  is a section view of an example of the variable geometry nozzle  150  described in  FIG. 14A  wherein the fluid flossing from the inner flow passage  152  in the direction of the orifice  425  in what is known in the art as normal circulation. Fluid force the movable element  400  to engage with the inner flow passage  152  and result in a downstream passage  800  geometry of different geometry when compared to the downstream geometry generated by the movement in  FIG. 14A . It is worth to note that the movable element  400  can be arranged such that that the downstream passage  800  geometry in  FIG. 14A  is larger or smaller than the downstream passage  800  geometry of  FIG. 14B . 
       FIG. 14C  is a section view of an example of the variable geometry nozzle  150  described in  FIG. 14A  under the effect of reverse circulation wherein a resilient element  405  as described in  FIG. 5C  insure that the movable element  400  is biased in certain direction such that its movement by effect of fluid flow starts when the force exerted by the fluid flowing through the variable geometry nozzle  150  exceed the force imposed by the resilient element  405 . 
       FIG. 14D  is a section view of an example of the variable geometry nozzle  150  described in  FIG. 14C  wherein the movable element  400  is in a different position under the effect of normal circulation when compared to  FIG. 14C  and resulting in a downstream passage  800  of different geometry. 
       FIGS. 15A-15D  depict examples of the variable geometry nozzle  150  described in  FIGS. 5E and 5F  wherein the movable element movement direction  825  is controlled by the circulation pattern. 
       FIG. 15A  is an example of the variable geometry nozzle  150  described in  FIG. 5E  wherein the normal circulation from inner flow passage  152  to the orifice  425  cause the movable element  400  to change position guided by the cam follower  415  traversing the cam track  410  in a determined spacing and direction. When fluid flow direction  820  is reversed in what is known reverse circulation or when it is moving from the orifice  425  direction towards inner flow passage  152 , then it will force the movable element  400  to change position to another direction guided by the cam  420  flower traversing the cam track  410  and resulting in the movable element  400  interacting with the inner flow passage  152  and causing the downstream passage  800  to have certain geometry as seen in  FIG. 15B . The cyclic movement of fluid flowing in normal flow direction  820  or reverse flow direction  820  will cause the movable element  400  to move within the variable geometry nozzle  150  body  200  as guided by the cam  420  and as a result the movable element  400  will engage with the inner flow passage  152  at different predetermined positions and stays in the same position until the fluid is reversed in circulation. 
     This is the main principle of the method disclosed in here to control the geometry of the variable geometry nozzle  150  apparatus and keep it at a certain position during the desired operation. 
       FIGS. 16A-16D  are examples of possible placements of preferred examples of the variable geometry nozzle  150  apparatus within the tubular string  110 . 
       FIG. 16A  is a section view of an example wherein the variable geometry nozzle  150  is placed in bit perforation  125  and the result is a bit having a remotely operated variable geometry nozzle  150 .  FIG. 16B  is a section view of an example of the variable geometry nozzle  150  disposed within a tubular string  110  having a downstream passage  800  of variable geometry affecting the fluid flow profile flowing between the inner flow passage  152  and the orifice  425 .  FIG. 16C  is a section view of an example of the variable geometry nozzle  150  disposed between the inner flow passage  152  and the annular flow passage  154  controlling the flow profile and flow pattern between the inner flow passage  152  and the annular flow passage  154  according to the downstream passage  800  geometry. This figure is showing a possible example of the variable geometry nozzle  150  wherein the variable geometry nozzle  150  body  200  is an integrated body  830  element within the bottom hole assembly  130 . 
       FIG. 16D  is an example of a portion of a tubular string  110  member such as a drill pipe  140 . 
       FIG. 17  is a flowchart diagram describing the method disclosed for remotely controlling the variable geometry nozzle  150 . Step  1   855  is to dispose in a well bore the variable geometry nozzle  150 . Step  2   860  is to cause at least one physical change of the environment. Step  3   865  causing the movable element  400  to change position to a different predetermined position wherein the different predetermined position results in a change of the geometry at the location between the inner flow passage  152  and the orifice  425 . 
     Since other modifications and changes varied to fit particular operating requirements and environments will be apparent to those skilled in the art, the invention is not considered limited to the example chosen for purposes of disclosure, and covers all changes and modifications which do not constitute departures from the true spirit and scope of this invention. 
     Having thus described the invention, what is desired to be protected by Letters Patent is presented in the subsequently appended claims.