AN APPARATUS, A SYSTEM AND A METHOD FOR WASHING A TUBULAR IN A WELLBORE

Abstract: An apparatus for washing a tubular in a wellbore, said apparatus comprising a mandrel having a fluid flow bore therethrough, at least one mandrel port in said mandrel, a sleeve mounted around said mandrel, and at least one sleeve port in said sleeve, characterised in that said sleeve is, in use, rotating relative to said mandrel.

Description: - 1 - An Apparatus , a System and a Method for Washing a Tubular in a Wellbore This invention relates to an apparatus , an system and a method for washing a tubular in a wellbore, and is particularly, but not exclusively, relates to a wash nozzles for use in a wellbore for facilitating the flow of cuttings away from a mill, drill or mill-drill. In wellbore milling, drilling, and milling-drilling operations cuttings are produced which, if not efficiently removed from the area around a mill, drill, or mill-drill, will inhibit or prevent effective operation . Typically such cuttings are removed by fluid pumped from the surface down through a work string, tubing string, or coiled tubing, through various apparatuses and devices, to the location of milling, drilling, or milling-drilling. In many prior art systems fluid is pumped through ports in a nozzle, mill, drill, or mill-drill . The pumped fluid moves the cuttings away from wellbore tools and up in an annulus in the wellbore . In various wellbore operations, it is desirable to wash the interior of a tubular string. A variety of wash nozzles are used in prior art systems to accomplish this. There has long been a need for an efficient and effective wash nozzle for washing tubulars' interiors and/or for cuttings removal, and for wellbore systems and methods with such a nozzle . Accordingly, the present invention provides a An apparatus for washing a tubular in a wellbore, said apparatus comprising a mandrel having a fluid flow bore therethrough, at least one mandrel port in said mandrel, a sleeve mounted around said mandrel, and at least one sleeve port in said sleeve, characterised in that said sleeve is, in use, rotates relative to said mandrel. Other aspects of the invention are set out in the dependent claims . - 2 - The invention also provides a method and a system as set out in the claims . 3 - For a better understanding of the present invention, reference will now be made, by way of example, to the accompanying drawings , in which: Figure 1 is a side cross-sectional view of an apparatus in accordance with the present invention, shown in a first stage of operation; Figure 2A is a side cross-sectional view of the apparatus of Figure 1 , in a second stage of operation; Figure 2B is a view along line 2B-2B of Figure 2A; Figure 3 is a side view, with hidden parts shown with dash lines , partially schematic, of the apparatus of Figure 1 with parts attached thereto; Figure 4A is a side cross-sectional view of a second embodiment of an apparatus in accordance with the present invention; Figure 4B is a cross-section view along line 4B-4B of Figure 4A; Figure 4C is a cross-section view along line 4C-4C of Figure 4A; Figure 5 is a side cross-sectional view of part of a third embodiment of an apparatus in accordance with the present invention; Figure 6A is a top view of a ball useable in the apparatus of the present invention; Figure 6B is a top view of another ball useable in the apparatus of the present invention; Figure 7A is a side cross-sectional view of a plug useable in the apparatus of the present invention; Figure 7B is a side cross-sectional view of a plug useable in the apparatus of the present invention; Figure 8 is a side cross-sectional view of a prior art plug. Figure 9A is a top view of a plug useable in the apparatus of the present invention; and Figure 9B is a side view of the plug of Figure 9A. - 4 - Figs. 1 and 2A show a wash nozzle generally identified by reference numeral 10. The wash nozzle 10 according to the present invention comprises a central mandrel 20 which has a top sub 12 threadedly connected to a top 22 of the central mandrel 20 and a sleeve 30 with a bore 67 therethrough rotatably mounted around the exterior of the central mandrel 20. The top sub 12 is connectable to any other suitable wellbore apparatus, device, tubular, or tubular string. In one aspect the top sub 12 is sized to act as a top stabilizer for the wash nozzle 10. Alternatively a stabilizer and/or centralizer is attached to or formed of the top and/or bottom of the mandrel 20. Fluid pumped from the surface down a string to which the top sub 12 is connected flows through a fluid flow bore 24 through the top sub 12 and through a fluid flow bore 24 from the top 22 of the central mandrel 20 to and out through a bottom 25 of the central mandrel 20. An O-ring 13 seals an interface between the interior of the top sub 12 and the exterior of the central mandrel 20. An O-ring 14 in a recess 15 in the sleeve 30 seals a sleeve/mandrel interface as does O-ring 16 in a recess 17 of the mandrel 20, O-ring 18 in a recess 19 of the sleeve 30, O-ring 8 in a recess 9 of the mandrel 20, and O-ring 6 in a recess 7 of the sleeve 30. A plurality (eight in this embodiment) of upper wash ports 28 through the mandrel 20 are in fluid communication with a cut-out portion 29 of the mandrel 20 which, with a cut-out portion 39 of the sleeve 30 defines a cut-out area 40 which is in fluid communication with a plurality of upper wash ports 38 through the sleeve 30. A plurality (eight in this embodiment) of lower wash ports 26 through the mandrel 20 are in fluid communication with a cut-out portion 27 of the mandrel 20 which, with a cut-out portion 37 of the sleeve 30 defines 5 - a cut-out area 42 which is in fluid communication with a plurality of lower wash ports 36 through the sleeve 30. Rotation of the sleeve 30 with respect to the mandrel 20 is facilitated by a plurality of ball bearings 44 disposed in a raceway 23 in the mandrel 20 and a raceway 33 in the sleeve 30 ; and by a plurality of ball bearings 46 in a raceway 21 of the mandrel 20 and a raceway 31 of the sleeve 30. Removable plugs 66 provide access to the raceways and permit introduction of the bearings into the raceways and removal therefrom. A piston 50 with a fluid flow bore 54 therethrough from top to bottom is initially sealingly and releasably held in the bore 24 of the mandrel 20 by shearable pins 56 (one, two, three, or more) which extend through the mandrel 20 into the piston 50. In one aspect the pins shear in response to a force between about 180Kg (400 pounds) and lOOOKg (2200 pounds) . In one aspect the pins are brass . In the position shown in Figure 1 , the piston 50 blocks fluid flow through the lower wash ports 26 of the mandrel 20. An O-ring 51 in a recess 53 and an O-ring 55 in a recess 57 seal the piston/mandrel interface. As shown in Figure 2A, a ball 60 has been dropped into the piston 50 to sealingly abut a seat 59 of the piston 50 closing off fluid flow through the piston 50 and hence through the mandrel 20. Fluid pressure has sheared the pins 56, freeing the piston 50 for downward movement stopped by an inner shoulder 62 of the mandrel 20, thereby opening the lower wash ports 26 to fluid flow. Figure 2B shows one embodiment of a sleeve 30 with angled lower wash ports 36. Fluid flowing under pressure through the lower wash ports 26 of the mandrel 20 and through the cut-out area 42 impinges on the walls of the sleeve 30 defining its lower wash ports 36, causing the - 6 - sleeve 30 to move and to rotate around the mandrel 20. Thus rotating fluid spray is produced both through the lower wash ports 36 and through the upper wash ports 38. Alternatively, the upper wash ports may be similarly angled instead of or in addition to the angling of the lower wash ports . Figure 3 shows a system 70 according to the present invention with a wash nozzle 10 connected at the top to a connector C which itself is connected to a coil tubing string S that extends through a wellbore in the earth from the connector C to the surface . An optional downhole motor M is connected below the wash nozzle 10 and a cutting tool T (e.g. any suitable mill, bit, or mill-drill) is connected to and below the downhole motor M. In one specific method of operation of the system 70, the downhole motor M is activated to perform a cutting operation (milling, drilling, and/or milling- drilling) which produces cuttings . Upon completion of the cutting operation, the ball 60 is dropped to seal against the seat 59. Following movement of the piston 50 (e.g. to a position as shown in Figure 2A) fluid flows out through the lower wash ports 36 to move the cuttings and propel them upwardly to the surface. In one aspect such an operation including cutting (e.g. milling a window in a tubular and/or extending a bore in an earth formation) and washing is accomplished in a single trip into a wellbore . In another embodiment the piston 50 is optional and is deleted so that fluid flow rotates the sleeve 30 at all times. In such an embodiment, one, some or all of the various ports are sized and angled so that desired rotation of the sleeve is achieved. A wash nozzle 10, with or without a piston 50 , is movable through a tubular string (e.g. tubing, casing, pipe) to clean the interior - 7 - thereof . An enlarged portion 68 of the mandrel 20 acts as a centralizer or stabilizer. Instead of or in addition to the bearings 44, 46, one or more bearing surfaces 48 may be provided on the exterior of the mandrel 20 and/or bearing surfaces 47 on the interior of the sleeve 30. The sleeve 30 , when no bearings 44, 46 are used, can ride on shoulder 69 of the mandrel 20 with the cut-out areas 40, 42 sufficiently large to insure fluid flow therethrough; or the end of the sleeve 30 as shown in Figure 1 is extended to contact the shoulder 69. The bearing surfaces 47 may be any desired length and may cover substantially all or a part of the inner surface of the sleeve 30 ; and the bearing surfaces 48 may be any desired length and may cover substantially all or a part of the exterior surface of the central mandrel 20 adjacent the sleeve 30. Appropriately sized nozzles according to the present invention are useful for washing any enclosed member, including, but not limited to any wellbore tubular or string thereof (above or below ground, vertically, horizontally, or otherwise oriented) , and any heat exchange member or tubular . Figure 4A discloses a wash nozzle 80 like the wash nozzle 10 in many respects and like numerals indicate like parts . A central mandrel 120 is like the central mandrel 20 of the wash nozzle 10, but the central mandrel 20 has no upper wash ports 28 or cut-out portion 29. A sleeve 130 is like the sleeve 30, but has no upper wash ports 38 or cut-out portion 39. A seat member 74 with a seat 75 and a flow bore 76 therethrough is secured in the bore 24 of the mandrel 120. A closure device (e.g. any suitable prior art ball, plug, dart etc. or any device disclosed herein) seating against the seat 75 closes off flow through the bottom 25 8 - of the mandrel 120. Fluid therefore is forced out mandrel ports 77, through a cut-out area 78, and then through upper sleeve ports 79. With the lower ports 26, 36 closed off to flow, flow through the upper sleeve ports 79 effects rotation of the sleeve 130. Ports in Figs. 4A - 4C and cut-out area 78 are shown schematically. Preferably, these items are sized and disposed so that, prior to entry and seating of a closure device on the seat 75, flow through the upper and lower sleeve ports produces counter balancing forces and the sleeve does not rotate or rotates only minimally. Following seating of a closure device in the seat 75, the lower sleeve ports are blocked to fluid flow and the fluid pressure of fluid flowing out the upper angled sleeve ports effects (and/or increases) sleeve rotation. Figure 5 shows an alternative mandrel/sleeve combination for any embodiment described above. A sleeve 150 is rotatably mounted around a mandrel 152. Mandrel ports 154 are in fluid communication with a cut-out area 156 which is in fluid communication with sleeve ports 158. A seat member 157 with seat 155 and bore 153 performs as does the seat member in Figure 4A. In one aspect the sleeve ports 158 are not angled with respect to the sleeve. In the embodiment shown, the ports resemble those of either Figure 4B or 4C so that fluid at sufficient pressure flowing through the ports effects sleeve rotation. Optionally, an optional shear pin (or pins) 151 initially releasably secures the sleeve 150 to the mandrel 152. This pin(s) shears at a desired fluid pressure when one or more angled sleeve ports are used. Figure 6A shows a ball closure device 160 made of washable, removable, or dissolvable material 161. Figure 6B shows a ball closure device 162 with a series of channels 163 extending through the ball from one side to the other, each filled with washable or dissolvable - 9 - material 164. Only one such channel may be used. Figure 7A shows a plug closure device 165 made entirely of washable, removable, or dissolvable material 166. Figure 7B shows a plug 167 with a central bore 168 initially filled with washable, removable, or dissolvable material 169. Additional bores with similar material may be used. Figure 8 shows a prior art plug 101 with a rupture disk 115 as described in U.S. Patent 5,390,736 issued Feb. 21, 1995, co-owned with the present invention and incorporated fully herein for all purposes . A rupture disk or burst tube may be used in any of the channels of the devices of Figs. 6A, 7B, and 9B. Figure 9A shows a plug 170 according to the present invention with a body 171 and portions 172 made of washable, removable, or dissolvable material 173. Any of the closure devices of Figs . 6A - 9a may be used to close off a seat in a seat member used in nozzles according to the present inventio . It is within the scope of this invention for any embodiment hereof having one series of ports or two series of ports to have one, two or more additional series of ports above those already shown.

Claims: - 10 - CLAIMS : 1. An apparatus for washing a tubular in a wellbore, said apparatus comprising a mandrel having a fluid flow bore therethrough, at least one mandrel port in said mandrel , a sleeve mounted around said mandrel , and at least one sleeve port in said sleeve, characterised in that said sleeve is, in use, rotates relative to said mandrel . 2. An apparatus as claimed in Claim 1 , wherein the at least one sleeve port is angled with respect to the sleeve so that fluid impinging on the wall defining the at least one sleeve port moves the sleeve to rotate about the central mandrel . 3. An apparatus as claimed in Claim 1 , wherein the at least one mandrel port is a plurality of lower mandrel ports, and the at least one sleeve port is a plurality of lower sleeve ports . 4. An apparatus as claimed in Claim 3 , further comprising a lower cut-out area within the apparatus defined by a cut-out portion of the central mandrel and a cut-out portion of the sleeve, and the lower mandrel ports and the lower sleeve ports in fluid communication with the lower cut-out area. 5. An apparatus as claimed in Claim 3 , wherein the at least one mandrel port includes a plurality of upper mandrel ports spaced apart from the lower mandrel ports , and the at least one sleeve port includes a plurality of upper sleeve ports spaced apart from the lower sleeve ports . 6. An apparatus as claimed in Claim 3 , further comprising an upper cut-out area within the wash nozzle defined by a cut-out portion of the central mandrel and a cut-out portion of the sleeve, and the upper mandrel ports and the upper sleeve ports in fluid communication with the upper cut-out area. 11 - 7. An apparatus as claimed in Claim 6 , further comprising a piston having a top, a bottom, and a fluid flow bore therethrough from top to bottom, at least one shearable member releasably securing the piston to and within the central mandrel , and a portion of the piston initially blocking fluid flow through the lower mandrel ports . 8. An apparatus as claimed in Claim 7 , wherein the piston is configured and sized so that upon shearing of the at least one shearable member the piston is movable within the central mandrel ' s fluid flow bore to a position at which the piston does not block fluid flow into the lower mandrel ports . 9. An apparatus as claimed in Claim 7 , wherein the piston has an internal seat closable by a closure device dropped into the piston's fluid flow bore to shut off fluid flow through the piston. 10. An apparatus as claimed in Claim 9, including a closure device shutting off fluid flow through the piston. 11. An apparatus as claimed in Claim 10, wherein the closure device has at least a portion thereof made of removable material whose removal re-establishes fluid flow through the piston . 12. An apparatus as claimed in claim 11 , wherein the closure device is substantially all made of removable material . 13. An apparatus as claimed in claim 11, wherein the removable material is shear-pinned with at least one shear pin to the closure device and shearing of the at least one shear pin frees the removable material . 14. An apparatus as claimed in claim 10, wherein the closure device has at least a portion thereof made of dissolvable material whose dissolution re-establishes fluid flow through the piston. - 12 - 15. An apparatus as claimed in claim 14, wherein the closure device is substantially all dissolvable material . 16. An apparatus as claimed in claim 1, further comprising bearing apparatus between the sleeve and the central mandrel to facilitate sleeve rotation . 17. An apparatus as claimed in claim 16, wherein the bearing apparatus includes a plurality of ball bearings in at least one raceway between the central mandrel and the sleeve . 18. An apparatus as claimed in claim 17, wherein the at least one raceway is at least two raceways each with a plurality of ball bearings therein . 19. An apparatus as claimed in claim 16, wherein the bearing apparatus is a bearing surface on an interior of the sleeve . 20. An apparatus as claimed in claim 16, wherein the bearing apparatus is a bearing surface on an exterior of the central mandrel . 21. An apparatus as claimed in claim 1, further comprising a stabilizer member at a lower end of the central mandrel, and a stabilizer member at the top of the central mandrel . 22. An apparatus as claimed in claim 1 , further comprising apparatus for selective rotation of the sleeve about the mandrel. 23. A wash nozzle for wellbore washing operations, the wash nozzle comprising a central mandrel having a fluid flow bore therethrough, a plurality of spaced-apart upper and lower mandrel ports through the central mandrel for fluid flow from within the central mandrel ' s fluid flow bore to an exterior of the central mandrel , a hollow sleeve rotatably mounted around the central mandrel, and a plurality of spaced-apart upper and lower sleeve ports through the sleeve for fluid flow from within the sleeve to an exterior of the sleeve, each lower sleeve port - 13 - defined by a wall of the sleeve and angled with respect to the sleeve so that fluid impinging on the wall defining each lower sleeve port moves the sleeve to rotate about the central mandrel , a lower cut-out area within the wash nozzle defined by a cut-out portion of the central mandrel and a cut-out portion of the sleeve, the lower mandrel ports and the lower sleeve ports in fluid communication with the lower cut-out area, an upper cut-out area within the wash nozzle defined by a cut-out portion of the central mandrel and a cut-out portion of the sleeve, the upper mandrel ports and the upper sleeve ports in fluid communication with the upper cut-out area, a piston having a top, a bottom, and a fluid flow bore therethrough from top to bottom, at least one shearable member releasably securing the piston to and within the central mandrel, a portion of the piston initially blocking fluid flow through the lower mandrel ports , and the piston configured and sized so that upon shearing of the at least one shearable member the piston is movable within the central mandrel's fluid flow bore to a position at which the piston does not block fluid flow into the lower mandrel ports so that fluid flows from the central mandrel , through the lower mandrel ports , through the lower cut out area and through the lower sleeve ports to rotate the sleeve effecting rotative fluid flow from the wash nozzle. 24. An apparatus as claimed in claim 5 further comprising the plurality of lower sleeve ports including at least one angled lower sleeve port angled in a first direction with respect to the sleeve so that fluid from the central mandrel impinging on a wall defining the at least one angled lower sleeve port forces the sleeve to rotate in a first direction, the plurality of upper sleeve ports including at least one angled upper sleeve port angled in a second direction with respect to the - 14 - sleeve so that fluid from the central mandrel impinging on a wall defining the at least one angled upper sleeve port forces the sleeve to rotate in a second direction opposite to the first direction, and said forces on the sleeve counteracting each other to inhibit sleeve rotation . 25. An apparatus as claimed in claim 24 wherein the forces on the sleeve prevent sleeve rotation . 26. An apparatus as claimed in claim 24 wherein the at least one angled lower sleeve port is a plurality of angled lower sleeve ports , the at least one angled upper sleeve port is a plurality of angled upper sleeve ports, and forces on the upper and lower angled sleeve ports counteract each other to inhibit sleeve rotation. 27. An apparatus as claimed in claim 24 further comprising a seat around the fluid flow bore through the central mandrel , the seat disposed so that a closure device on the seat blocks fluid flow to the at least one angled lower sleeve port and so that flow to the at least one angled upper sleeve port is not blocked, effecting rotation of the sleeve. 28. An apparatus as claimed in claim 27 including a closure device on the seat. 29. An apparatus as claimed in claim 28 wherein the closure device has means for re-establishing fluid flow through the wash nozzle. 30. A system comprising a wash nozzle with a top and a bottom and comprising a central mandrel having a top, a bottom, and a fluid flow bore therethrough from top to bottom, at least one mandrel port through the central mandrel for fluid flow from within the central mandrel ' s fluid flow bore to an exterior of the central mandrel, a hollow sleeve rotatably mounted around the central mandrel, and at least one sleeve port through the sleeve for fluid flow from within the sleeve to an exterior of - 15 - the sleeve, the at least one sleeve port defined by a wall on the sleeve, a downhole motor operatively connected to the bottom of the wash nozzle and in fluid communication therewith, a wellbore cutting tool operatively connected to and beneath the downhole motor, and a tubular string connected to and above the wash nozzle and in fluid communication therewith . 31. A method for cleaning a tubular in an earth wellbore, the method comprising locating a wash nozzle adjacent a tubular to be cleaned, the wash nozzle comprising a central mandrel having a top, a bottom, and a fluid flow bore therethrough from top to bottom, at least one mandrel port through the central mandrel for fluid flow from within the central mandrel ' s fluid flow bore to an exterior of the central mandrel , a hollow sleeve rotatably mounted around the central mandrel, and at least one sleeve port through the sleeve for fluid flow from within the sleeve to an exterior of the sleeve, the at least one sleeve port defined by a wall on the sleeve, and flowing fluid through the wash nozzle to clean an interior of the tubular . 32. A method for removing cuttings from a wellbore, the method comprising introducing a wellbore system into the wellbore containing cuttings, the wellbore system comprising a wash nozzle comprising a central mandrel having a top, a bottom, and a fluid flow bore therethrough from top to bottom, at least one mandrel port through the central mandrel for fluid flow from within the central mandrel ' s fluid flow bore to an exterior of the central mandrel, a hollow sleeve rotatably mounted around the central mandrel , and at least one sleeve port through the sleeve for fluid flow from within the sleeve to an exterior of 16 - the sleeve , the at least one sleeve port defined by a wall on the sleeve, a downhole motor operatively connected to the bottom of the wash nozzle and in fluid communication therewith, a wellbore cutting tool operatively connected to and beneath the downhole motor, and a tubular string connected to and above the wash nozzle and in fluid communication therewith, rotating the wellbore cutting tool with the downhole motor, producing wellbore cuttings, and flowing fluid through the at least one mandrel port and through the at least one sleeve port into a space exterior to the wash nozzle to facilitate removal of the cuttings from the wellbore .

Inventors: BEEMAN ROBERT STEPHEN, BREAUX STEPHEN P, LEE MARK HOWARD, MCCLUNG GUY LAMONT III, BEEMAN, ROBERT, STEPHEN, BREAUX, STEPHEN, P., LEE, MARK, HOWARD, MCCLUNG, GUY, LAMONT, III
Applicants: LUCAS BRIAN RONALD, WEATHERFORD LAMB, LUCAS, BRIAN, RONALD, WEATHERFORD/LAMB, INC.
Application year: 1999
Main classification: E21B37
IPC codes: E21B37