CA2253753A1 - Washpipe stabilisation - Google Patents
Washpipe stabilisation Download PDFInfo
- Publication number
- CA2253753A1 CA2253753A1 CA002253753A CA2253753A CA2253753A1 CA 2253753 A1 CA2253753 A1 CA 2253753A1 CA 002253753 A CA002253753 A CA 002253753A CA 2253753 A CA2253753 A CA 2253753A CA 2253753 A1 CA2253753 A1 CA 2253753A1
- Authority
- CA
- Canada
- Prior art keywords
- washpipe
- washover
- assembly
- well bore
- shoe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000006641 stabilisation Effects 0.000 title 1
- 239000003381 stabilizer Substances 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims description 8
- 230000000712 assembly Effects 0.000 abstract description 5
- 238000000429 assembly Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 18
- 239000012530 fluid Substances 0.000 description 8
- 238000004891 communication Methods 0.000 description 2
- 230000003019 stabilising effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/03—Freeing by flushing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Marine Sciences & Fisheries (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Cleaning In General (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to washpipe assemblies for use in well bores and provides a washpipe assembly (2) comprising a washover shoe (10) attached to a washpipe (18), wherein a washpipe stabiliser (22) is provided on the washpipe (18) so that, when in use, deflection of the washover shoe (10) from a desired position is substantially prevented. The washpipe assembly of the present invention has the advantage over the prior art assemblies of providing means for supporting the washpipe off the wall of a well bore or well bore casing (52), and thereby reducing the torque required to rotate the washover string and the tendency of the washover shoe (10) to deviate from its preferred path down the well bore.
Description
CA 022~37~3 1998-11-06 WO 97/~3517 PCT/GB97/01219 WASHPIPE STABILISATIQN
The invention relates to washpipe assemblies for use in well bores.
It is common in the oil and gas drilling industry for equipment to become trapped in a well bore so that access to the region of well bore downhole of the e~uipment is restricted or prevented. Equipment becomes trapped for a variety of reasons. For example, sediment may settle about the equipment, the formation surrounding the equipment may collapse or the equipment may even be dellberately cemented. In order to remove equipment trapped under these circumstances, it is necessary to remove the external material retaining the equipment within the well bore. It is well known that this may be achieved by means of a washover string. This type of string cuts the external material from the trapped equipment and transfers the cut material to the surface by means of well bore fluid flow passing uphole through the annulus.
A conventional washover string typically incorporates a washover shoe, a washpipe, a drive sub (collectively referred to as the washpipe assembly) and a drive shaft linking the drive sub to drive equipment located at the surface. The washover shoe is rigidly connected to the washpipe and has the function of cutting the external material preventing the trapped equipment from being removed. Cutting elements, such as tungsten inserts, are provided for this purpose. Both the washover shoe and the washpipe are typically of a cylindrical shape having large inner and outer diameters. The large inner diameters define a bore which is capable of receiving the trapped equipment as the washover shoe cuts through the external material and moves downhole. The washpipe is rigidly connected to the drive sub which provides a connection between the washpipe and the drive shaft. The washover string is rotated by means of the drive equipment located at the surface and is pressed onto .
the external material until sufficient material has been cut to release the trapped equipment.
In order to guide the movement of the washover string as the washover shoe cuts through the external material, stabilising means is generally provided on the drive shaft. The centralisation of the washover shoe within the well bore is critical to the efficient and effective use of a washover string. However, centralisation of the washover shoe is often hindered when the direction of travel of the washover string is capable of being influenced by the external profile of the trapped equipment. In these circumstances, the portion of the washover string below the stabilising means tends to bend allowing the washover shoe to deviate from its preferred course.
Prior art document US 3,747,674 discloses a washover pipe spear apparatus for engaging and washing over a pipe stuck within a well bore. The apparatus includes a washpipe, a retrieving assembly within the washpipe, and releasable latch means joining the retrieving assembly and the washover pipe. The retrieving assembly includes a slip assembly and a releasable clutch which is operated by vertical manipulations of the supporting tubing string to selectively control the setting of the slip assembly. A stuck pipe may be thereby engaged by the retrieving assembly and removed from the well bore.
It is an objection of the present invention to provide a washpipe assembly which does not tend to deviate from its preferred course when the washover shoe engages the trapped equipment to be washed over.
The present invention provides a washpipe assembly for use in a well bore, the washpipe assembly comprising a washover shoe attached to a washpipe, the washover shoe and washpipe being cylinders defining a bore of the washpipe assembly adapted to receive equipment A~lENDED SHEE~
located within the well bore, characterised in that, a washpipe stabiliser is provided on the washpipe so that, when in use, deflection of the washover shoe from a desired position is substantially prevented.
The distance between the stabiliser and washover shoe in the washpipe assembly of the present invention is considerably less than in traditional washpipe assemblies. The close proximity of the stabiliser to the washover shoe reduces the degree of bend in the washover string between the washover shoe and the stabiliser. Consequently, the tendency of the washover shoe to deviate from the preferred path down the well bore is reduced.
It is preferable for the cylinder of the washover shoe to be provided with cutting members located on the lower end portion thereof.
Thus, as the washover shoe cuts external material surrounding trapped equipment and subsequently progresses down the well bore, the trapped equipment may be received within the bore of the washpipe assembly.
The stabiliser is preferably provided as a plurality of blade members projecting from an exterior surface of the washpipe. The stabiliser preferably incorporates five blade members and each blade member is preferably arranged in a helix about the washpipe.
Furthermore, each blade member is preferably provided with a cutting edge. It is also desirable for the stabiliser to be provided on a portion of the washpipe adjacent the washover shoe.
The washpipe assembly of the present invention has the advantage over the prior art assemblies of providing means for supporting the washpipe off the wall of the well bore or well bore casing, and thereby reducing the torque required to rotate the washover string and the tendency of the washover shoe to deviate from its preferred path down the well bore.
A specific embodiment of the present invention will now be AMENDED SHEET
CA 022.737.73 1998 - 1 1 - 06 described with reference to the accompanying drawings, in which:
Figure 1 is a cross-section view of a washpipe assembly according to the present invention;
Figure 2 is a side view of the stabiliser shown in Figure l;
Figure 3 is an end view of the stabiliser shown in Figure 2;
and Figure 4 is a cross-section view of the washpipe assembly of Figure 1 located within a well l)ore above trapped equipment.
The washpipe assembly 2 shown in Figure 1 incorporates a number of components rigidly attached to one another by means of threaded connections 4,6,8. The components include a washover shoe 10, a lower washpipe 12, an upper washpipe 14 and a drive sub 16. The lower washpipe 12 is rigidly attached to the upper washpipe 14 by means of threaded connection 6 and thereby provides a complete washpipe 18 of the desired length. The lower end of the washpipe 18 is rigidly attached to the washover shoe 10 by means of threaded connection 4.
The upper end of the washpipe 18 is rigidly attached to the drive sub 16 by means of threaded connection 8. When in use, the drive sub 16 is threadedly connected to a drive shaft 20 (shown in Figure 4).
The washpipe 18 is provided with a stabiliser 22 incorporating five bl;3de members 24 arranged in a helix about the lower washpipe 12. The blade members 24 are formed as an integral part of the lower washpipe 12 and may be provided by machining, welding or any other suitable manufacturing techniques. A detailed view of the washpipe 18 is provided by Figures 2 and 3. The washpipe assembly 2 has dimensions suitable for a 244 mm (9.625 inch) well bore casing having an inner diameter of 220 mm (8.681 inches). The outer diameter 26 of the washpipe is 206 mm (8.125 inches) and the outer diameter 28 of the blade members 24 is 216 mm (8.500 inches). The washpipe 18 AA~IENDED SHEET
.. . ~ ~ .
defines a washpipe bore 30 having a diameter 32 of 185 mm (7.285 inches). The bore 30 and the length of the washpipe 18 are of sufficient magnitude to receive trapped equinment when the washpipe assembly 2 is in use. An appropriate length of washpipe 18 may be arranged prior to use by selecting suitable lengths of lower and upper washpipe sections 12,14 or by using a suitable number of standard length washpipe sections.
Each blade member 24 of the stabiliser 22 has a helix angle 34 of 5.2~ and has a width 36 at 90~ to the helix of 67 mm (2.G25 inches). Furthermore, each blade member 24 is provided with a cutting edge 25.
The washover shoe 10 has substantially the same outer diameter as the washpipe 18 and is provided with a bore 38 having substantially the same diameter as the washpipe bore 30. The bores 30,38 of the washpipe 18 and the washover shoe 10 are in fluid communication with one another and with a bore 40 provided in the drive sub 16. When in use, the bores 30,38,40 of the washpipe assembly 2 are in fluid communication with the surface via a bore 42 provided in the drive shaft 20 (see Figure 4).
The lower end portion 44 of the washover shoe 10 has a smaller internal diameter and a larger external diameter than the main body of the washover shoe 10. Tungsten inserts (not shown) are provided on the external surface 46, the lower surface 48 and the internal surface 50 of the lower end portion 44 so as to provide means for cutting external material from equipment trapped within a well bore. The lower end portion 44 has an external diameter equal in magnitude to that of the outer diameter 28 of the blade members 24. The external diameter of the lower end portion 44 may alternatively have a greater magnitude than the outer diameter 28, but should not have a magnitude less than the outer diameter 28 since this would prevent the passage of the stabiliser 22 passed the trapped equipment during the washover operation. The lower AMENDED SHEET
CA 022~37~3 1998-11-06 surface 48 of the washover shoe lO is provided with fluid courses (not shown~ which allow the flow of well bore fluid passed the external material being cut, thereby cooling the washover shoe 10 and removing cut portions of the external material.
The washover operation of the washpipe assembly 2 is shown in Figure 4 of the accompanying drawings. The washpipe assembly 2 is attached to a drive shaft 20 and run down a well bore 52 until the washover shoe 10 abuts external material 54 preventing removal of trapped equipment 56. The external material 54 is removed by rotating the drive shaft 20 and the washpipe assembly 2 by means of the drive equipment located at the surface. External material 54 cut fiom the trapped equipment 56 is removed by a flow of well bore fluid passing downhole through the bores 42,40,30,38 of the washover stri~ through the fluid courses and uphole through the annulus 58. The direction of flow of the well bore fluid is indicated by arrows A, B and C.
As the washover shoe 10 cuts away the external material 54, the washover strin~ is pushed downhole. As the washover shoe 10 progresses down the well bore 52, the trapped equipment 56 is received within the bores 38,30 of the washover shoe 10 and the washpipe 18. The tendency of the washover shoe 10 to be deflected from a central position within the well bore 52 is reduced by the guiding effect of the stabiliser 22. The washpipe assembly 2 is moved down the well bore 52 so that the washover shoe lO cuts away the external material 54 located both above the trapped equipment 56 and between the trapped equipment 56 and the well bore 52. Movement of the washpipe assembly 2 down the well bore 52 is continued until the stabiliser 22 passes the trapped equipment 56.
The blade members 24 of the stabiliser 22 not only guide the washover shoe 10, but also act as a milling tool and clean the interior surface of the well bore 52 in the region of the trapped equipment 56.
A~JlENDED SHEET
The present invention is not limited to the specific embodiment described above. Alternative arrangements and suitable materials will be apparent to a reader skilled in the art.
AMENDED SHEET
The invention relates to washpipe assemblies for use in well bores.
It is common in the oil and gas drilling industry for equipment to become trapped in a well bore so that access to the region of well bore downhole of the e~uipment is restricted or prevented. Equipment becomes trapped for a variety of reasons. For example, sediment may settle about the equipment, the formation surrounding the equipment may collapse or the equipment may even be dellberately cemented. In order to remove equipment trapped under these circumstances, it is necessary to remove the external material retaining the equipment within the well bore. It is well known that this may be achieved by means of a washover string. This type of string cuts the external material from the trapped equipment and transfers the cut material to the surface by means of well bore fluid flow passing uphole through the annulus.
A conventional washover string typically incorporates a washover shoe, a washpipe, a drive sub (collectively referred to as the washpipe assembly) and a drive shaft linking the drive sub to drive equipment located at the surface. The washover shoe is rigidly connected to the washpipe and has the function of cutting the external material preventing the trapped equipment from being removed. Cutting elements, such as tungsten inserts, are provided for this purpose. Both the washover shoe and the washpipe are typically of a cylindrical shape having large inner and outer diameters. The large inner diameters define a bore which is capable of receiving the trapped equipment as the washover shoe cuts through the external material and moves downhole. The washpipe is rigidly connected to the drive sub which provides a connection between the washpipe and the drive shaft. The washover string is rotated by means of the drive equipment located at the surface and is pressed onto .
the external material until sufficient material has been cut to release the trapped equipment.
In order to guide the movement of the washover string as the washover shoe cuts through the external material, stabilising means is generally provided on the drive shaft. The centralisation of the washover shoe within the well bore is critical to the efficient and effective use of a washover string. However, centralisation of the washover shoe is often hindered when the direction of travel of the washover string is capable of being influenced by the external profile of the trapped equipment. In these circumstances, the portion of the washover string below the stabilising means tends to bend allowing the washover shoe to deviate from its preferred course.
Prior art document US 3,747,674 discloses a washover pipe spear apparatus for engaging and washing over a pipe stuck within a well bore. The apparatus includes a washpipe, a retrieving assembly within the washpipe, and releasable latch means joining the retrieving assembly and the washover pipe. The retrieving assembly includes a slip assembly and a releasable clutch which is operated by vertical manipulations of the supporting tubing string to selectively control the setting of the slip assembly. A stuck pipe may be thereby engaged by the retrieving assembly and removed from the well bore.
It is an objection of the present invention to provide a washpipe assembly which does not tend to deviate from its preferred course when the washover shoe engages the trapped equipment to be washed over.
The present invention provides a washpipe assembly for use in a well bore, the washpipe assembly comprising a washover shoe attached to a washpipe, the washover shoe and washpipe being cylinders defining a bore of the washpipe assembly adapted to receive equipment A~lENDED SHEE~
located within the well bore, characterised in that, a washpipe stabiliser is provided on the washpipe so that, when in use, deflection of the washover shoe from a desired position is substantially prevented.
The distance between the stabiliser and washover shoe in the washpipe assembly of the present invention is considerably less than in traditional washpipe assemblies. The close proximity of the stabiliser to the washover shoe reduces the degree of bend in the washover string between the washover shoe and the stabiliser. Consequently, the tendency of the washover shoe to deviate from the preferred path down the well bore is reduced.
It is preferable for the cylinder of the washover shoe to be provided with cutting members located on the lower end portion thereof.
Thus, as the washover shoe cuts external material surrounding trapped equipment and subsequently progresses down the well bore, the trapped equipment may be received within the bore of the washpipe assembly.
The stabiliser is preferably provided as a plurality of blade members projecting from an exterior surface of the washpipe. The stabiliser preferably incorporates five blade members and each blade member is preferably arranged in a helix about the washpipe.
Furthermore, each blade member is preferably provided with a cutting edge. It is also desirable for the stabiliser to be provided on a portion of the washpipe adjacent the washover shoe.
The washpipe assembly of the present invention has the advantage over the prior art assemblies of providing means for supporting the washpipe off the wall of the well bore or well bore casing, and thereby reducing the torque required to rotate the washover string and the tendency of the washover shoe to deviate from its preferred path down the well bore.
A specific embodiment of the present invention will now be AMENDED SHEET
CA 022.737.73 1998 - 1 1 - 06 described with reference to the accompanying drawings, in which:
Figure 1 is a cross-section view of a washpipe assembly according to the present invention;
Figure 2 is a side view of the stabiliser shown in Figure l;
Figure 3 is an end view of the stabiliser shown in Figure 2;
and Figure 4 is a cross-section view of the washpipe assembly of Figure 1 located within a well l)ore above trapped equipment.
The washpipe assembly 2 shown in Figure 1 incorporates a number of components rigidly attached to one another by means of threaded connections 4,6,8. The components include a washover shoe 10, a lower washpipe 12, an upper washpipe 14 and a drive sub 16. The lower washpipe 12 is rigidly attached to the upper washpipe 14 by means of threaded connection 6 and thereby provides a complete washpipe 18 of the desired length. The lower end of the washpipe 18 is rigidly attached to the washover shoe 10 by means of threaded connection 4.
The upper end of the washpipe 18 is rigidly attached to the drive sub 16 by means of threaded connection 8. When in use, the drive sub 16 is threadedly connected to a drive shaft 20 (shown in Figure 4).
The washpipe 18 is provided with a stabiliser 22 incorporating five bl;3de members 24 arranged in a helix about the lower washpipe 12. The blade members 24 are formed as an integral part of the lower washpipe 12 and may be provided by machining, welding or any other suitable manufacturing techniques. A detailed view of the washpipe 18 is provided by Figures 2 and 3. The washpipe assembly 2 has dimensions suitable for a 244 mm (9.625 inch) well bore casing having an inner diameter of 220 mm (8.681 inches). The outer diameter 26 of the washpipe is 206 mm (8.125 inches) and the outer diameter 28 of the blade members 24 is 216 mm (8.500 inches). The washpipe 18 AA~IENDED SHEET
.. . ~ ~ .
defines a washpipe bore 30 having a diameter 32 of 185 mm (7.285 inches). The bore 30 and the length of the washpipe 18 are of sufficient magnitude to receive trapped equinment when the washpipe assembly 2 is in use. An appropriate length of washpipe 18 may be arranged prior to use by selecting suitable lengths of lower and upper washpipe sections 12,14 or by using a suitable number of standard length washpipe sections.
Each blade member 24 of the stabiliser 22 has a helix angle 34 of 5.2~ and has a width 36 at 90~ to the helix of 67 mm (2.G25 inches). Furthermore, each blade member 24 is provided with a cutting edge 25.
The washover shoe 10 has substantially the same outer diameter as the washpipe 18 and is provided with a bore 38 having substantially the same diameter as the washpipe bore 30. The bores 30,38 of the washpipe 18 and the washover shoe 10 are in fluid communication with one another and with a bore 40 provided in the drive sub 16. When in use, the bores 30,38,40 of the washpipe assembly 2 are in fluid communication with the surface via a bore 42 provided in the drive shaft 20 (see Figure 4).
The lower end portion 44 of the washover shoe 10 has a smaller internal diameter and a larger external diameter than the main body of the washover shoe 10. Tungsten inserts (not shown) are provided on the external surface 46, the lower surface 48 and the internal surface 50 of the lower end portion 44 so as to provide means for cutting external material from equipment trapped within a well bore. The lower end portion 44 has an external diameter equal in magnitude to that of the outer diameter 28 of the blade members 24. The external diameter of the lower end portion 44 may alternatively have a greater magnitude than the outer diameter 28, but should not have a magnitude less than the outer diameter 28 since this would prevent the passage of the stabiliser 22 passed the trapped equipment during the washover operation. The lower AMENDED SHEET
CA 022~37~3 1998-11-06 surface 48 of the washover shoe lO is provided with fluid courses (not shown~ which allow the flow of well bore fluid passed the external material being cut, thereby cooling the washover shoe 10 and removing cut portions of the external material.
The washover operation of the washpipe assembly 2 is shown in Figure 4 of the accompanying drawings. The washpipe assembly 2 is attached to a drive shaft 20 and run down a well bore 52 until the washover shoe 10 abuts external material 54 preventing removal of trapped equipment 56. The external material 54 is removed by rotating the drive shaft 20 and the washpipe assembly 2 by means of the drive equipment located at the surface. External material 54 cut fiom the trapped equipment 56 is removed by a flow of well bore fluid passing downhole through the bores 42,40,30,38 of the washover stri~ through the fluid courses and uphole through the annulus 58. The direction of flow of the well bore fluid is indicated by arrows A, B and C.
As the washover shoe 10 cuts away the external material 54, the washover strin~ is pushed downhole. As the washover shoe 10 progresses down the well bore 52, the trapped equipment 56 is received within the bores 38,30 of the washover shoe 10 and the washpipe 18. The tendency of the washover shoe 10 to be deflected from a central position within the well bore 52 is reduced by the guiding effect of the stabiliser 22. The washpipe assembly 2 is moved down the well bore 52 so that the washover shoe lO cuts away the external material 54 located both above the trapped equipment 56 and between the trapped equipment 56 and the well bore 52. Movement of the washpipe assembly 2 down the well bore 52 is continued until the stabiliser 22 passes the trapped equipment 56.
The blade members 24 of the stabiliser 22 not only guide the washover shoe 10, but also act as a milling tool and clean the interior surface of the well bore 52 in the region of the trapped equipment 56.
A~JlENDED SHEET
The present invention is not limited to the specific embodiment described above. Alternative arrangements and suitable materials will be apparent to a reader skilled in the art.
AMENDED SHEET
Claims (8)
1. A washpipe assembly (2) for use in a well bore, the washpipe assembly (2) comprising a washover shoe (10) attached to a washpipe (18), the washover shoe (10) and washpipe (18) being cylinders defining a bore of the washpipe assembly (2) adapted to receive equipment located within the well bore, characterised in that, a washpipe stabiliser (22) is provided on the washpipe (18) so that, when in use, deflection of the washover shoe (10) from a desired position is substantially prevented.
2. A washpipe assembly (2) as claimed in claim 1, wherein the cylinder of the washover shoe (10) is provided with cutting members mounted on the lower end portion (44) thereof.
3. A washpipe assembly (2) as claimed in claim 1 or 2. wherein the stabiliser (22) is provided as a plurality of blade members (24) projecting from an exterior surface of the washpipe (18).
4. A washpipe assembly (2) as claimed in claim 3, wherein each blade member (24) is arranged in a helix about the washpipe (18).
5. A washpipe assembly (2) as claimed in claim 3 or 4, wherein the stabiliser (22) incorporates five blade members (24).
6. A washpipe assembly (2) as claimed in any of claims 3 to 5, wherein the blade members (24) are provided with a cutting edge.
7. A washpipe assembly (2) as claimed in any of the preceding claims, wherein the stabiliser (22) is provided on a portion of the washpipe (18) adjacent the washover shoe (10).
8. A washpipe assembly (2) as claimed in any of the preceding claims, wherein the stabiliser (22) is an integral part of the washpipe (18).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9609706.8A GB9609706D0 (en) | 1996-05-09 | 1996-05-09 | Washpipe stabiliser |
| GB9609706.8 | 1997-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2253753A1 true CA2253753A1 (en) | 1997-11-20 |
Family
ID=10793434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002253753A Abandoned CA2253753A1 (en) | 1996-05-09 | 1997-05-02 | Washpipe stabilisation |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20010035290A1 (en) |
| EP (1) | EP0898638B1 (en) |
| AU (1) | AU2705897A (en) |
| CA (1) | CA2253753A1 (en) |
| GB (2) | GB9609706D0 (en) |
| NO (1) | NO319098B1 (en) |
| WO (1) | WO1997043517A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0026460D0 (en) * | 2000-10-27 | 2000-12-13 | Sps Afos Internat Branch Ltd | Combined milling and scraping tool |
| US20090211747A1 (en) * | 2008-02-25 | 2009-08-27 | Baker Hughes Incorporated | Washpipe |
| AU2010281419B2 (en) | 2009-07-28 | 2014-05-29 | Halliburton Energy Services, Inc. | Wellbore cleanout tool |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2764387A (en) * | 1952-02-06 | 1956-09-25 | Dionisotti Joseph | Rock drill adapted to inject fluid into a bore hole |
| FR2071206A5 (en) * | 1969-12-19 | 1971-09-17 | Inst Francais Du Petrole | |
| US3747674A (en) * | 1971-05-06 | 1973-07-24 | Tri State Oil Tools Inc | Wash-over pipe spear apparatus |
| US3848684A (en) * | 1973-08-02 | 1974-11-19 | Tri State Oil Tools Inc | Apparatus for rotary drilling |
| US4275935A (en) * | 1979-07-17 | 1981-06-30 | American Coldset Corp. | Drilling stabilizer |
| DE3362959D1 (en) * | 1982-12-16 | 1986-05-15 | Appleton Robert P | Device for retrieving objects from wells |
| US4580826A (en) * | 1984-02-17 | 1986-04-08 | Carver Herman C | Retrieval tool |
| US4662436A (en) * | 1986-05-23 | 1987-05-05 | Parra Ernest P | Tool for washing over, cutting and retrieving a portion of a pipe within a well bore |
-
1996
- 1996-05-09 GB GBGB9609706.8A patent/GB9609706D0/en active Pending
-
1997
- 1997-05-02 CA CA002253753A patent/CA2253753A1/en not_active Abandoned
- 1997-05-02 EP EP97920827A patent/EP0898638B1/en not_active Expired - Lifetime
- 1997-05-02 WO PCT/GB1997/001219 patent/WO1997043517A1/en active IP Right Grant
- 1997-05-02 GB GB9709039A patent/GB2312907B/en not_active Expired - Fee Related
- 1997-05-02 AU AU27058/97A patent/AU2705897A/en not_active Abandoned
-
1998
- 1998-11-05 NO NO19985174A patent/NO319098B1/en not_active IP Right Cessation
-
2001
- 2001-01-24 US US09/729,712 patent/US20010035290A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB2312907B (en) | 2000-05-03 |
| NO319098B1 (en) | 2005-06-20 |
| NO985174D0 (en) | 1998-11-05 |
| GB9609706D0 (en) | 1996-07-10 |
| EP0898638B1 (en) | 2002-07-31 |
| GB9709039D0 (en) | 1997-06-25 |
| EP0898638A1 (en) | 1999-03-03 |
| NO985174L (en) | 1998-11-05 |
| WO1997043517A1 (en) | 1997-11-20 |
| GB2312907A (en) | 1997-11-12 |
| US20010035290A1 (en) | 2001-11-01 |
| AU2705897A (en) | 1997-12-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |