WO1997043517A1 - Washpipe stabilisation - Google Patents
Washpipe stabilisation Download PDFInfo
- Publication number
- WO1997043517A1 WO1997043517A1 PCT/GB1997/001219 GB9701219W WO9743517A1 WO 1997043517 A1 WO1997043517 A1 WO 1997043517A1 GB 9701219 W GB9701219 W GB 9701219W WO 9743517 A1 WO9743517 A1 WO 9743517A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- washpipe
- washover
- assembly
- well bore
- shoe
- Prior art date
Links
- 230000006641 stabilisation Effects 0.000 title description 2
- 239000003381 stabilizer Substances 0.000 claims abstract description 20
- 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 19
- 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
- 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
- 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
Definitions
- the invention relates to washpipe assemblies for use in well bores.
- 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.
- 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.
- 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.
- the portion of the washover string below the stabilising means tends to bend allowing the washover shoe to deviate from its preferred course.
- the present invention provides a washpipe assembly for use in a well bore, the washpipe assembly comprising a washover shoe attached to a washpipe, wherein 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.
- the washover shoe prefferably be a cylinder defining a bore, the cylinder of the washover shoe being provided with cutting members located on the lower end portion thereof. Furthermore, it is desirable for the bore of the washover shoe to be adapted to receive equipment located within the well bore. 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 washover shoe bore.
- the washpipe of the present invention may be provided as an elongate cylinder defining a bore.
- the bore of the washpipe is adapted to receive equipment located within the well bore.
- trapped equipment received by the bore of the washover shoe may progress into the bore of the washpipe as further external material is cut and the washover string moves further downhole.
- 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.
- 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 1 ;
- FIG 3 is an end view of the stabiliser shown in Figure 2;
- Figure 4 is a cross-section view of the washpipe assembly of Figure 1 located within a well bore 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.
- 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 blade 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 9.625 inch well bore casing having an inner diameter of 8.681 inches.
- the outer diameter 26 of the washpipe is 8.125 inches and the outer diameter 28 of the blade members 24 is 8.500 inches.
- the washpipe 18 defines a washpipe bore 30 having a diameter 32 of 7.285 inches.
- the bore 30 and the length of the washpipe 18 are of sufficient magnitude to receive trapped equipment 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 2.625 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.
- 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 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 surface 48 of the washover shoe 10 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 from 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 string, 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.
- the washover string is pushed downhole.
- 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 10 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.
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)
- Cleaning In General (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU27058/97A AU2705897A (en) | 1996-05-09 | 1997-05-02 | Washpipe stabilisation |
EP97920827A EP0898638B1 (en) | 1996-05-09 | 1997-05-02 | Washpipe stabilisation |
NO19985174A NO319098B1 (en) | 1996-05-09 | 1998-11-05 | Device for stabilizing a flushing tool in a borehole |
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 | 1996-05-09 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09180521 A-371-Of-International | 1998-12-02 | ||
US09/729,712 Continuation US20010035290A1 (en) | 1996-05-09 | 2001-01-24 | Washpipe stabilization system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997043517A1 true WO1997043517A1 (en) | 1997-11-20 |
Family
ID=10793434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/001219 WO1997043517A1 (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) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7096950B2 (en) * | 2000-10-27 | 2006-08-29 | Specialised Petroleum Services Group Limited | Combined milling and scraping tool |
US8857517B2 (en) | 2009-07-28 | 2014-10-14 | Halliburton Energy Services, Inc. | Wellbore cleanout tool |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090211747A1 (en) * | 2008-02-25 | 2009-08-27 | Baker Hughes Incorporated | Washpipe |
Citations (5)
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 |
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 |
US4580826A (en) * | 1984-02-17 | 1986-04-08 | Carver Herman C | Retrieval tool |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2071206A5 (en) * | 1969-12-19 | 1971-09-17 | Inst Francais Du Petrole | |
EP0113201B1 (en) * | 1982-12-16 | 1986-04-09 | Robert Patrick Appleton | Device for retrieving objects from wells |
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 GB GB9709039A patent/GB2312907B/en not_active Expired - Fee Related
- 1997-05-02 AU AU27058/97A patent/AU2705897A/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
-
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
Patent Citations (5)
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 |
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 |
US4580826A (en) * | 1984-02-17 | 1986-04-08 | Carver Herman C | Retrieval tool |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7096950B2 (en) * | 2000-10-27 | 2006-08-29 | Specialised Petroleum Services Group Limited | Combined milling and scraping tool |
US8857517B2 (en) | 2009-07-28 | 2014-10-14 | Halliburton Energy Services, Inc. | Wellbore cleanout tool |
Also Published As
Publication number | Publication date |
---|---|
GB2312907A (en) | 1997-11-12 |
GB9709039D0 (en) | 1997-06-25 |
NO985174L (en) | 1998-11-05 |
GB9609706D0 (en) | 1996-07-10 |
NO319098B1 (en) | 2005-06-20 |
US20010035290A1 (en) | 2001-11-01 |
GB2312907B (en) | 2000-05-03 |
EP0898638A1 (en) | 1999-03-03 |
AU2705897A (en) | 1997-12-05 |
NO985174D0 (en) | 1998-11-05 |
EP0898638B1 (en) | 2002-07-31 |
CA2253753A1 (en) | 1997-11-20 |
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