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CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application is a divisional of U.S. divisional patent application Ser. No. 10/388,869, filed Mar. 14, 2003, now U.S. Pat. No. 6,719,056, which is a divisional of patent application Ser. No. 10/163,814, filed Jun. 6, 2002, now U.S. Pat. No. 6,640,904, which is a divisional of patent application Ser. No. 09/536,937, filed Mar. 27, 2000, now U.S. Pat. No. 6,427,776. Each of the aforementioned related patent applications is herein incorporated by reference. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to an apparatus for removing sand and other debris from a wellbore; more particularly, the invention relates to apparatus and methods for use in a wellbore utilizing a venturi. 
   2. Background of the Related Art 
   In the production of oil and gas, sand breaks loose from oil producing formations and is carried into the wellbore with production fluid. As the production rate of oil increases, the formation sand which breaks loose and enters the wellbore also increases. Over time, the wellbore can become filled and clogged with sand making efficient production of the well increasingly difficult. In addition to sand from the formation, other debris including scale, metal shavings and perforation debris collects in the wellbore and interferes with production. 
   One method of removing debris from a wellbore involves the introduction of liquid which is circulated in the well. For example, liquid can be pumped down the wellbore through a pipe string and convey debris to the surface of the well upon return through an annulus formed between the pipe string and the wall of the wellbore. Nitrogen or some other gas can be added to the liquid to create a foam for increasing the debris carrying ability of the liquid. However, a relatively small amount of debris is actually conveyed to the well surface and removed in this manner because of the relatively large volume of space in a wellbore that must be filled with sand bearing liquid. 
   Another prior art method for removing debris from a well includes lowering a container into the well which is filled with debris and then removed. Typically, the container is sealed at the well surface and an atmospheric chamber formed therein. When the chamber is lowered into the well and opened, the pressure differential between the interior of the container and the wellbore causes the wellbore contents, like debris to be surged into the container. While this method of debris removal is effective, the amount of debris removed is strictly limited by the capacity of the container and in practice is typically not more than 85% of the chamber volume. Additionally, the container must be continuously lowered into the well, filled due to pressure differential, raised from the well and emptied at the well surface. 
   More recently, a nozzle or other restriction has been utilized in the wellbore to increase circulation of a liquid and to cause, by low pressure, a suction thereunder to collect or “bail” debris. The use of a nozzle in a pressurized stream of fluid is well known in the art and operates according to the following principles: The nozzle causes pressurized liquid pumped from the surface of the well to assume a high velocity as it leaves the nozzle. The area proximate the nozzle experiences a drop in pressure. The high velocity fluid from the nozzle is diverted out of the tool and the low pressure area creates a vacuum in the tool below the nozzle, which can be used to create a suction and pull debris from a well along with fluid returning to the high velocity stream. By the use of a container, the debris can be separated from the flow of fluid, collected and later removed from the well. A prior art tool utilizing a nozzle and a diverter is illustrated in  FIG. 1 . The device  100  includes a nozzle portion  105 , a diverter portion  110 , a container  120  for captured debris and one way valve  125  to prevent debris from returning from the tool to the wellbore  130 . A filter is provided above the container but is designed to prevent the passage of particles larger than grains of sand. While the fluid pumped through the nozzle creates a low pressure and suction therebelow, this design is only marginally effective and the suction created in the tool results in only a partially filled container of debris. For example, experiments measuring the effectiveness of the prior art design of  FIG. 1  have resulted in a measured suction of only 3–5″ of mercury. 
   Another apparatus for the removal of debris utilizes a venturi and is described in International Publication No. WO 99/22116 which is incorporated herein in its entirety by reference. The venturi utilizes a nozzle like the one illustrated in prior art  FIG. 1 . In additional to the nozzle, the venturi includes a throat portion and a diffuser portion to more effectively utilize the high velocity fluid to create a low pressure area and a suction therebelow. The apparatus of the &#39;116 publication, like the device of  FIG. 1  also includes a container for holding captured debris wherein the debris enters a flapper valve at the bottom of the container which fills with debris due to suction created by the venturi and is later removed from the well to be emptied at the well surface. While this arrangement is more effective than the one illustrated in  FIG. 1 , the mechanism is complex and expensive since each part of the device is specially fabricated and the parts are not interchangeable. Most importantly, the nozzle provided with the device is often too small to pass debris carried by the power fluid, clogging the nozzle and making the device useless. Additionally, the size of the container in the prior art devices is fixed limiting the flexibility of the tools for certain jobs requiring large capacity containers. 
   Aside from simply clearing debris to improve flow of production fluids, debris removal tools can be used to clear debris that has collected in a wellbore over the top of a downhole device, exposing the device and allowing its retrieval and return to the well surface. For example, a bridge plug may be placed in a wellbore in order to isolate one formation from another or a plug maybe placed in a string of tubular to block the flow of fluid therethough. Any of these downhole devices can become covered with debris as it migrates into the wellbore, preventing their access and removal. Removing the debris is typically done with a debris removal device in a first trip and then, in a separate trip, a device retrieval tool is run into the well. This process is costly in terms of time because of the separate trips required to complete the operation. 
   Debris removal is necessary in any well, whether live and pressurized or dead. In a live well, problems associated with the prior devices are magnified. Circulating fluid through a live well requires a manifold at the well surface to retain pressure within the wellbore. Use of an atmospheric chamber in a live well requires a pressure vessel or lubricator at the well surface large enough to house the atmospheric chambers. 
   There is a need for debris removal tool utilizing a high velocity fluid stream which effectively removes debris from a wellbore. There is a further need for a debris removal tool that can utilize interchangeable parts depending upon the quality of debris to be removed. There is a further need for a device retrieval tool which can also be used in a single trip to retrieve a downhole device as well as remove debris. There is yet a further need for a debris removal tool with an adjustable container formed of coiled tubing. There is a further need for a method of debris removal and device retrieval in a live well. 
   SUMMARY OF THE INVENTION 
   The present invention provides a simple debris removal apparatus for use in a wellbore. In one aspect of the invention a modular, interchangeable venturi is provided which can be retrofit into an existing debris bailer having a filter and a debris collection container. The venturi module replaces a simple and ineffective nozzle and results in a much more effective bailing apparatus. In another aspect of the invention, a venturi is utilized to create a negative pressure in a wellbore sufficient to actuate a retrieval tool for a downhole device. In yet another aspect of the invention, a combination tool is provided which can evacuate debris in a wellbore, thereby uncovering a downhole device which can then be removed in a single trip. In yet another aspect of the invention, a debris removal apparatus is provided with a method for utilizing the apparatus in a wellbore on coiled tubing. In yet another aspect of the invention a debris removal apparatus is provided which can be run on coiled tubing in a live well using a method of selective isolation and pressure bleed off. In yet another aspect, the invention utilizes a section of coiled tubing for a debris container whereby the coiled tubing can be sized depending upon the amount of debris to be removed in the operation. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     So that the manner in which the above recited features, advantages and objects of the present invention are attained and can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. 
     It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments. 
       FIG. 1  is a prior art debris removal tool having a simple nozzle to increase velocity of a fluid therein to create a suction in the tool therebelow. 
       FIG. 2  is a section view of the debris removal tool of the present invention showing a venturi in a diverter portion in the tool. 
       FIG. 3  is an enlarged view of the venturi portion of the tool showing the flow direction of fluid therethrough. 
       FIG. 4  is a section view showing one dimensional design of the venturi portion of the tool. 
       FIG. 5  is a section view showing one dimensional design of the venturi portion of the tool. 
       FIG. 6  is a section view showing one dimensional design of the venturi portion of the tool. 
       FIG. 7  is a section view showing one dimensional design of the venturi portion of the tool. 
       FIG. 8  is a section view of the present invention including a retrieval tool disposed at a lower end thereof. 
       FIG. 9  is a section view of the retrieval tool in an actuated, retracted position. 
       FIG. 10  is a section view of the retrieval tool in a un-actuated, extended position. 
       FIG. 11  depicts the debris removal tool of the present invention with coiled tubing disposed therein as a debris container. 
       FIG. 12  is the tool of  FIG. 11  with a spoolable, double valve disposed within the length of coiled tubing and a retrieval tool disposed at the lower end of the tubing. 
       FIG. 13  is a section view showing a wellhead with a lubricator thereabove and a device retrieval tool disposed therein, the lubricator being installed on the wellhead. 
       FIG. 14  is a section view of the wellhead with the lubricator installed thereupon, the lubricator being pressurized to the pressure of the wellbore. 
       FIG. 15  is a section view of the wellhead with a blind ram opened, the retrieval tool having been lowered in the well and a double valve in the coiled tubing string in the lubricator. 
       FIG. 16  is a section view of the wellhead with a lower pipe ram in a closed position and the lubricator pressurized to atmospheric pressure. 
       FIG. 17  is a section view illustrating the wellhead with the lubricator having been lifted therefrom exposing the double valve and the coiled tubing severed thereabove. 
       FIG. 18  is a section view of the wellhead with debris removal tool inserted into the coiled tubing string and an access port installed therebelow. 
       FIG. 19  is a section view of the wellhead with the coiled tubing in the lubricator having been reattached to the coiled tubing in the wellhead, the upper pipe ram closed and the lubricator pressurized to the pressure of the wellbore. 
       FIG. 20  is a section view of a wellhead, the access port pressurized to the pressure of the wellbore and the upper and lower pipe rams opened. 
       FIG. 21  is a section view of the wellhead after the debris removal and device retrieval is completed, the debris removal tool raised into the lubricator and the double valve housed within the access port. 
       FIG. 22  is a section view of the wellhead wherein the upper and lower pipe rams have been closed and the access port has been pressurized to atmospheric pressure. 
       FIG. 23  is a section view of the wellhead showing a blind flange removed from the access port and the double valve adjusted to the closed position. 
       FIG. 24  is a section view of the wellhead showing the lubricator pressurized to atmospheric pressure and, thereafter, the upper pipe ram opened. 
       FIG. 25  is a section view of the wellhead showing the lubricator and debris removal tool removed from the wellhead, the coiled tubing severed above the double valve. 
       FIG. 26  is a section view of the wellhead showing the lubricator with the debris removal tool having been removed therefrom and a length of coiled tubing disposed within for connection to the coiled tubing extending from the wellhead therebelow. 
       FIG. 27  is a section view of the wellhead showing the lubricator pressurized to the pressure of the wellbore and thereafter, the lower pipe ram opened. 
       FIG. 28  is a section view of the wellhead showing the retrieval tool with the retrieved device lifted from the well and disposed within the lubricator. 
       FIG. 29  is a section view of the wellhead showing a blind ram in a closed position. 
       FIG. 30  is a section view of the wellhead showing the lubricator with the retrieval tool and retrieved device disposed therein and removed from the wellhead. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 2  is a section view of a debris bailer tool  200  of the present invention. The tool includes an upper portion  205 , a venturi portion  210 , a diverter portion  215 , a debris screen or filter portion  220  and a debris container  225  including a flapper or ball valve  230  at a lower end thereof. The filter portion  220  is replaceable and is designed to separate debris as small as sand particles from return fluid passing from the container to the venturi portion. In the one embodiment for example, the filter removes particles as small as 8 microns. Depending upon well conditions and the needs of the operator, the screen can be sized for the debris expected to be encountered in the wellbore as well as the type of fluid in the wellbore. For example, some drilling muds will clog a fine screen, but will flow easily through a screen with larger openings therein. The tool  200  operates by the injection of fluid into the upper portion  205  where the fluid travels to the venturi portion  210  and the velocity of the fluid increases as it passes through the nozzle and is then diverted outside of the tool. In the preferred embodiment, the upper portion of the venturi is threaded allowing easy replacement of the venturi for different debris removal operations or a retro fitting of the venturi portion into a prior art tool like the one shown in  FIG. 1 .  FIG. 3  is an enlarged view of the venturi portion of the tool. The venturi includes a nozzle  211 , throat  212  and a diffuser  213 . 
   According to the principals of a venturi device, high pressure power fluid passing through the nozzle has its potential energy (pressure energy) converted to kinetic energy in a jet of fluid at high velocity. The power fluid can be made up of a liquid like-water or a foam or even a gas. Well fluid mixes with the power fluid in a constant area throat and momentum is transferred to the well fluid, causing an energy rise in the well fluid. As the mixed fluids exit the throat, they are still at the high velocity, and thus contain substantial kinetic energy. The fluids are slowed in an expanding area diffuser that converts the remaining kinetic energy to static pressure sufficient to lift fluids and with them debris, to a containment member in the tool. The arrows  214  in  FIG. 3 , illustrate the flow of fluid through and around the venturi. Return fluid is recirculated into the nozzle through ports  304 . In a well setting, the device creates a vacuum and fluid and debris are drawn into the container portion of the tool. 
     FIGS. 4–7  are section views of the venturi portion of the device and illustrate a variety of physical nozzle, throat return port and diffuser sizes to determine flow rates therethrough. In every example, the venturi  300  includes a nozzle  301 , a throat  302  and a diffuser  303  portion. If a throat size is selected such that the area of the nozzle is 60% of the throat area, a relatively high head, low flow rate will result. Adversely, if a throat is selected such that the area of the nozzle is only 20% of the throat area, more well fluid flow is possible. However, since the nozzle energy is being transferred to a large amount of production compared to the power fluid rate, lower heads will be developed. Design variables include the size of the nozzle and throat and the ratios of their flow areas, as well as component shapes, angles, lengths, spacing, finishes and materials. Through selection of appropriate flow areas and ratios, the venturi configuration can be optimized to match well conditions. Most importantly, a nozzle size can be selected to pass debris that may be present in the power fluid. 
     FIG. 8  is a section view of the present invention including a retrieval tool disposed at a lower end thereof. The retrieval tool  400  is installed at the end of the debris removal tool  200  and relies upon the same venturi forces for operation as are utilized by the debris removal tool  200 . Retrieval tools are well known in the art and are used to retrieve downhole devices like plugs, bridge plugs and packers that have been fixed temporarily in the wellbore but are designed for removal and are fitted with some means for attachment to a retrieval tool. The combined apparatus including the debris removal tool  200  and retrieval tool  400  are run into a well together in order to clear debris from the surface of a downhole device in the wellbore and then retrieve the device and bring it back to the surface of the well. The apparatus of the invention allows both of these operations to be completed in one time-saving trip into the wellbore. 
     FIGS. 9 and 10  are section views showing the retrieval tool  400  in its actuated ( FIG. 9 ) and un-actuated ( FIG. 10 ) positions. The tool  400  includes an outer body  405 , a slidable member  410  and a collet member  415  disposed between the outer body  405  and the slidable member  410 . The collet member  415  is equipped with fingers at a downhole end. Fingers  420  are designed to flex inward when the tool is actuated and to be prevented from inward flexing by the slidable member  410  when the tool is in the extended position. A biasing member  425  biases the slidable member in a normally extended, position as depicted in  FIG. 10 . In order to actuate the tool  400  and cause it to assume the retracted position shown in  FIG. 9 , a venturi device thereabove as depicted in  FIG. 8  is operated creating a suction therebelow. The suction, in addition to gathering debris into the container as herein described, can also act upon a piston surface  430  formed at the downhole end of the retrieval tool, causing the inner member  410  to act against the biasing member  425  and the tool to assume a retracted position. 
   In operation, the retrieval tool  400  is run into the well along with the debris removal tool  200 . At a predetermined depth where debris is encountered, the debris removal tool  200  is operated and the debris removed from the wellbore and urged into the container  120  of the debris removal tool  200 . Throughout this operation, the retrieval tool  400  will be in an actuated, retracted position as shown in  FIG. 9 , its inner member urged upwards against the biasing member  425  by the suction force created in the debris removal tool  200  thereabove. After the debris has been contained and a downhole device  450  exposed for retrieval, the retrieval tool  400 , still in the actuated position, is inserted into a receiving member of the downhole device. Typically, the receiving member of the downhole device will include at least one profile  451  formed therein to interact with the fingers  420  of the retrieval tool  400 . The fingers  420  easily flex in order for the retrieval tool  400  to be inserted into the device  450 . Thereafter, the venturi device stops operating and the retrieval tool  400  returns to its normally extended position, preventing the fingers from flexing inward and locking the retrieval tool to the downhole device. The device  450  can then be removed by upward or rotational force or a combination thereof and raised to the top of the well along with the tools  200 ,  400 . 
   In the embodiment described, the retrieval tool operates by communicating with a profile formed upon the inner surface of the downhole device. However, the tool could also operate with a downhole device having a profile formed on the outside thereof. In this case, the collet fingers would be prevented from inward flexing movement by the inner member. 
   Use of the debris removal tool of the present invention can be performed using a predetermined and measured length of coiled tubing as a debris container, whereby the tool can be easily and economically custom made for each debris removal job depending upon the amount of debris to be removed for a particular wellbore.  FIG. 11  depicts a debris removal tool  500  with a length of coiled tubing  505  disposed within as a debris container. Rather than a permanent container like those depicted in  FIGS. 1 &amp; 2 , the debris container in  FIG. 11  is formed of coiled tubing that has been cut to length at the well surface and installed between the venturi portion  510  of the debris removal tool  500  and the filter  515  and one way valve  520  thereof. 
   In a preferred embodiment, a motor head  525  is inserted between the venturi portion and the coiled tubing thereabove, the motor head typically including connectors, double flapper check valves to prevent pressurized fluid from returning to the well surface and a hydraulic disconnect (not shown). The assembled apparatus can then be lowered into a wellbore to a predetermined depth proximate formation debris to be removed. The venturi apparatus is then operated, causing a suction and urging debris into the coiled tubing portion between the venturi  510  and the one way valve  520 . 
     FIG. 12  is a view of a debris removal tool  600  with a retrieval tool  610  disposed therebelow and a length of coiled tubing  615  disposed therebetween. Like the apparatus of  FIG. 11 , the coiled tubing  615  is used as a debris container and is measured and sized depending upon the amount of debris to be removed. In addition, a spoolable, double valve  620  is inserted in the coiled tubing string. The purpose of the spoolable, double valve is to facilitate the isolation of areas above and below the valve when debris and/or a downhole device is removed from a live well as described below. Because the double valve is spoolable, it can be wound on and off of a reel without being removed from a string of coiled tubing. In the preferred embodiment, the valves making up the double valve are ball valves. However, any type valve could be used so long as it is tolerant of stresses applied during reeling and unreeling with coiled tubing. 
     FIG. 13  is a section view showing a wellhead  700  with a blind ram  705  in a closed position and a lubricator  715  disposed thereabove with a retrieval tool  720  at the end of a coiled tubing string  725  disposed therein. The lubricator  715  is a pressure vessel which can be pressurized to the pressure of the wellbore and placed in fluid communication with the wellbore. At an upper end of the lubricator  715 , a stripper  730  allows coiled tubing to move in and out of the lubricator, maintaining a pressurized seal therewith. Valves  735 ,  740  are provided at an upper end of the lubricator for pressurizing and bleeding pressure.  FIG. 14  is a section view showing the wellhead  700  with the lubricator  715  attached thereto. The lubricator  715  is pressurized via valve  740  to wellbore pressure by an external source of pressure. In the preferred embodiment, the retrieval tool  720  within the lubricator  715  includes a meltable plug (not shown) disposed in the end thereof. The plug is made of a substance which, at ambient temperature is a solid that seals the interior of the tool to external pressure. The plug is designed to melt and disintegrate at temperatures found in the wellbore where the debris removal will take place. 
     FIG. 15  is a section view showing the wellbore opened and the retrieval tool lowered into the wellbore a predetermined distance. Double valve  620 , inserted in the string of coiled tubing  615 , is at a location within the lubricator  715 .  FIG. 16  is a section view of the apparatus with a lower pipe ram  745  in the closed position and thereafter, the pressure in the lubricator bled off via valve  735 . 
     FIG. 17  is a section view of the wellhead  700  with the lubricator  715  and raised thereabove. The coiled tubing string  615  has been severed above the double valve  620 .  FIG. 18  illustrates the assembly with the debris removal tool  510  and motor head  525  disposed within the lubricator  715  and an additional access port  750  and upper ram  755  added to the lubricator.  FIG. 19  is a section view wherein the lubricator  715 , upper pipe ram  755  and access port  750  have been attached to the wellhead  700  with the lower pipe ram  745  closed. The lubricator  715  is pressurized via valve  740  to the pressure of the wellbore.  FIG. 20  is a section view wherein the lower pipe ram  745  is open and the debris removal tool is lowered into the wellbore sufficient distance to place the retrieval tool therebelow in the area of the debris to be removed. 
   In the preferred embodiment, the retrieval tool is lowered into the well with a length of coiled tubing there behind sufficient and volume to house the debris which will be removed from the wellbore. After a sufficient amount of coiled tubing has been lowered into the well behind the retrieval tool, the venturi apparatus with its double safety valve is installed in the coiled tubing. As the retrieval tool reaches that location in the wellbore where it will be removed, the temperature present in the wellbore causes the plug in the end of the retrieval tool to melt by exposing the coiled tubing section to wellbore pressure and permitting communication between the venturi apparatus and the debris containing wellbore. 
     FIG. 21  depicts the wellhead assembly after the debris removal and device retrieval has been completed and the debris removal tool  510  has been raised out of the wellbore and is housed again in the lubricator  715 . Visible specifically in  FIG. 21  is the double valve  620 , still in its opened position and raised to a location where it is accessible through the access port  750 .  FIG. 22  is a section view depicting the upper pipe ram  755  between the access port  750  and the lubricator  715  in a closed position and the lower pipe ram  745  between the access port  750  and the wellhead  700  also in a closed position in order to isolate the access port  750 . As depicted in the figure, with the access port  750  isolated above and below, pressure is bled therefrom. 
     FIG. 23  is a section view depicting an access plate  751  removed from the access port  750  and the double valve  620  manipulated to a closed position.  FIG. 24  is a section view of showing the pressure bled from the lubricator  715  via valve  735 .  FIG. 25  depicts the lubricator  715  and access port  750  having been removed from the wellhead  700 , exposing the double valve  620 , the coiled tubing  615  thereabove having been severed. 
     FIG. 26  depicts the lubricator  715  with the debris removal tool  510  removed therefrom, leaving only a string of coiled tubing  615  in the lubricator  715 . As depicted in the figure, the coiled tubing string in the lubricator can now be reconnected to the coiled tubing string extending from the double valve  620 , which remains in the closed position.  FIG. 27  is a section view depicting the lubricator  715  having been reconnected to the wellhead  700  and pressurized to wellbore pressure via valve  740 . Thereafter, the lower pipe ram  745  is opened and, as illustrated by the directional arrow, the coiled tubing string  615  is retracted from the wellbore. 
     FIG. 28  is a section view wherein the retrieval tool  610  and downhole device  611  has been lifted from the wellbore and is housed within the lubricator  715 . 
     FIG. 29  is a section view wherein the blind ram  705  has been closed and, thereafter, the pressure within the lubricator  715  is bled via valve  735 .  FIG. 30  is a section view wherein the lubricator  715 , the retrieval tool  610  and downhole device  611  have been removed from the wellhead  700  and the debris removal and tool retrieval procedure is completed, leaving the wellhead  700  with the blind ram  705  in the closed position. 
   As described in the forgoing, the invention solves problems associated with prior art sand removal tools and provides an efficient, flexible means of removing debris or retrieving a downhole device from a live or dead well. The design of the tool is so efficient that tests have demonstrated a suction created in the tool measured at 28″ of mercury, compared with a measure of as little as 3–5″ of mercury using a prior art device like the one shown in  FIG. 1 . 
   While foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Summary:
A simple debris removal apparatus for use in a wellbore. In one aspect of the invention a modular, interchangeable venturi is provided which can be retrofit into an existing debris bailer having a filter and a debris collection container. In another aspect of the invention, a venturi is utilized to create a negative pressure in a wellbore sufficient to actuate a retrieval tool for a downhole device. In yet another aspect of the invention, a combination tool is provided which can evacuate debris in a wellbore, thereby uncovering a downhole device which can then be removed in a single trip. In yet another aspect of the invention, a debris removal apparatus is provided with a method for utilizing the apparatus in a wellbore on coiled tubing.