CA2432038A1 - Borehole stabilization while drilling - Google Patents
Borehole stabilization while drilling Download PDFInfo
- Publication number
- CA2432038A1 CA2432038A1 CA002432038A CA2432038A CA2432038A1 CA 2432038 A1 CA2432038 A1 CA 2432038A1 CA 002432038 A CA002432038 A CA 002432038A CA 2432038 A CA2432038 A CA 2432038A CA 2432038 A1 CA2432038 A1 CA 2432038A1
- Authority
- CA
- Canada
- Prior art keywords
- borehole
- drill string
- borehole wall
- pad
- drill
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 title claims abstract 20
- 230000006641 stabilisation Effects 0.000 title abstract 2
- 238000011105 stabilization Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 claims abstract 46
- 230000015572 biosynthetic process Effects 0.000 claims abstract 3
- 239000011505 plaster Substances 0.000 claims abstract 3
- 239000007787 solid Substances 0.000 claims 9
- 230000000087 stabilizing effect Effects 0.000 claims 8
- 230000008878 coupling Effects 0.000 claims 4
- 238000010168 coupling process Methods 0.000 claims 4
- 238000005859 coupling reaction Methods 0.000 claims 4
- 239000000463 material Substances 0.000 claims 4
- 238000005056 compaction Methods 0.000 claims 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
-
- 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
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
A method for drilling in unconsolidated formation is taught. In particular, a method for borehole stabilization in an unconsolidated formation includes providing a drill string; rotating the drill string to drive a drill bit to drill a borehole having a borehole wall; driving the drill string against the borehole wall while rotating the drift string to plaster the surface of the borehole wall.
Claims (55)
1. A method for stabilizing a borehole while drilling comprising: providing a drill string including a drill bit connected at a distal end thereof and a pad carried by the drill string to move axially and rotationally with the drill bit; rotating the drill bit to drill a borehole, the borehole including a borehole wall; and driving the pad substantially continuously against the borehole wall while rotating the drill bit to apply a lateral wall stress load helically about the borehole wall.
2. The method of claim 1, wherein the drill bit is driven by rotation of the drill string the pad is carried by the drill string to move rotationally and axially therewith.
3. The method of claim 1, wherein the pad applies lateral wall stress load to the borehole wall as it is driven against the borehole wall to compact earthen materials exposed on the borehole wall.
4. The method of claim 1, wherein the pad applies lateral wall stress load to the borehole wall as it is driven against the borehole wall to plaster borehole solids against the borehole wall.
5. The method of claim 1, wherein the pad applies lateral wall stress load to the borehole wall as it is driven against the borehole wall to reduce the hydraulic film between the pad and the borehole wall such that there is solid to solid contact.
6. The method of claim 1, wherein the pad applies lateral wall stress load to the borehole wall as it is driven against the borehole wall to reduce the hydraulic film between the pad and borehole solids such that there is solid to solid contact and the borehole solids are driven against the borehole wall.
7. The method of claim 1, further comprising selecting the pad to have wear resistance properties.
8. The method of claim 1, further comprising selecting the pad to ride against, substantially without digging into, the borehole wall.
9. The method of claim 1, further comprising driving the pad to sweep the complete circumference of the borehole wall during each revolution of the drill bit.
10. The method of claim 1, wherein the drill bit is driven by rotation of the drill string and the method further comprises driving the pad to sweep the complete circumference of the borehole wall during each revolution of the drill string.
11. The method of claim i further comprising stabilizing the drill string to reduce contact of the drill string with the borehole wall except at the pad.
12. A borehole drilling apparatus comprising: a drill string; a drill bit connected at a distal end of the drill string; and a pad carried by the drill string to move axially and rotationally with the drill bit, the drill bit being rotatable to drill a borehole, the borehole including a borehole wall and the pad being drivable substantially continuously against the borehole wall to apply a lateral wall stress load helically about the borehole wall as it is moved with the drill bit to stabilize the borehole wall.
13. The borehole drilling apparatus of claim 12 wherein the drill string includes a continuous length of tubing.
14. The borehole drilling apparatus of claim 12 wherein the drill string includes interconnected joints of tubing.
15. The borehole drilling apparatus of claim 12 wherein the drill string includes a string of casing joints connected together for both drilling the borehole and thereafter, remaining down hole to line the borehole.
16. The borehole drilling apparatus of claim 12 wherein the drill bit is driven by rotation of the drill string and the pad is carried by the drill string to move rotationally and axially therewith.
17. The borehole drilling apparatus of claim 12 wherein the pad applies lateral wall stress load to the borehole wall as it is driven against the borehole wall and the stress load causes compaction of the earthen materials exposed on the borehole wall and plasters materials against the borehole wall.
18. The borehole drilling apparatus of claim 12 wherein the pad includes a means for resisting wear from solid contact.
19. The borehole drilling apparatus of claim 18 wherein the means for resisting wear is applied at the surface of the pad that has solid contact.
20. The borehole drilling apparatus of claim 12 wherein the pad includes a leading edge and the leading edge is graduated to ride over the borehole wall.
21. The borehole drilling apparatus of claim 12 further comprising a second pad carried by the drill string to move axially and rotationally with the drill bit.
22. The borehole drilling apparatus of claim 12 further comprising a means for biasing the pad outwardly such that the pad includes an effective radius from a center axis of the drill string that extends outside the radius of the borehole if not constrained within the borehole.
23. The borehole drilling apparatus of claim 12 wherein the pad is positioned adjacent the bottom end of the drill string.
24. The method of claim 12 further comprising a stabilizing means on the drill string to reduce contact of the drill string with the borehole wall except at the pad.
25. A method for drilling a borehole having a borehole wall, the method comprising;
providing a drill string; rotating the drill string to drive a drill bit to drill the borehole; and driving the drill string against the borehole wall while rotating the drill string such that a lateral wall contact load is applied by the drill string against the borehole wall to consolidate the exposed wall earth materials to increase stability of the borehole wall.
providing a drill string; rotating the drill string to drive a drill bit to drill the borehole; and driving the drill string against the borehole wall while rotating the drill string such that a lateral wall contact load is applied by the drill string against the borehole wall to consolidate the exposed wall earth materials to increase stability of the borehole wall.
26. The method of claim 25 wherein the drill string is formed of drill pipe.
27. The method of claim 25 wherein the drill string is formed of casing joints connected by casing connections.
28. The method of claim 25 wherein the casing joints connected by casing connections.
29. The method of claim 25 wherein the drill string is driven against the borehole wall by provision of a bend in the drill string.
30. The method of claim 25 wherein the drill string is driven against the borehole wall by provision of a plurality of a bends along an interval of the drill string.
31. The method of claim 30 wherein the bends are intentionally imposed in the drill string.
32. The method of claim 29 further comprising providing wear protection at the bend.
33. The method of claim 29 further comprising selecting the angle magnitude of the bend.
34. The method of claim 29 further comprising the angular direction of the bend.
35. The method of claim 29 wherein the bend defines an outer bend area on the drill string and the method further comprising providing wear protection at the outer bend area.
36. A method for stabilizing a borehole wall in an unconsolidated formation, the method comprising: providing a drill string; rotating the drill string to drive a drill bit to drill a borehole having the borehole wall; driving the drill string against the borehole wall while rotating the drill string to plaster the surface of the borehole wall.
37. The method of claim 25 wherein the drill string is formed of drill pipe.
38. The method of claim 25 wherein the drill string is formed of casing joints connected by casing connections.
39. The method of claim 25 wherein the casing joints connected by casing connections.
40. The method of claim 25 wherein the drill string is driven against the borehole wall by provision of a bend in the drill string.
41. The method of claim 25 wherein the drill string is driven against the borehole wall by provision of a plurality of a bends along an interval of the drill string.
42. The method of claim 30 wherein the bends are intentionally imposed in the drill string.
43. The method of claim 29 further comprising selecting the angle magnitude of the bend.
44. The method of claim 29 further comprising the angular direction of the bend.
45. The method of claim 29 wherein the bend defines an outer bend area on the drill string and the method further comprising providing wear protection at the outer bend area.
46. The method of claim 36 further comprising selecting the drill string to have a first bend angle and a second bend angle in an interval.
47. The method of claim 46 wherein the directional orientation of the first bend angle is selected.
48. The method of claim 46 wherein the first bend angle is generated at a connection between an upper casing joint and a lower casing joint.
49. The method of claim 48 wherein the connection includes a threaded coupling having a mill end box having a center axis and a field end box having a center axis and the mill end box center axis being angularly offset from the field end box center axis to form a coupling bend angle and the bend angle is controlled by selecting the coupling bend angle.
50. The method of claim 46 wherein the first bend angle is formed by incorporating into the interval a casing joint having a characteristic capable of generating a bend angle in a casing string.
51. The method of claim 46 wherein the first bend angle is formed by incorporating into the interval a casing coupling having a characteristic capable of generating a bend angle in a casing string.
52. A borehole stabilizing apparatus for use with a drilling apparatus comprising: a pad installable into a drill string to move axially and rotationally with a drill bit of the drill string, the drill bit being rotatable to drill a borehole including a borehole wall, the pad being drivable substantially continuously against the borehole wall to apply a lateral wall stress load helically about the borehole wall during drilling.
53. The borehole stabilizing apparatus of claim 52 wherein the pad is formed to provide a smooth resilient contact stress that sweeps substantially the complete circumference of the borehole wall each revolution of the drill bit, or in the case of rotary drilling, each revolution of the drill string.
54. The borehole stabilizing apparatus of claim 53 wherein the pad is biased outwardly from the drill string.
55. The borehole stabilizing apparatus of claim 53 wherein drill string resiliency causes the pad to be biased outwardly against the borehole wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2432038A CA2432038C (en) | 2002-07-18 | 2003-06-12 | Borehole stabilization while drilling |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CA2002/001114 WO2003008755A2 (en) | 2001-07-18 | 2002-07-18 | Wear resistant tubular connection |
| EPPCT/CA02/01114 | 2002-07-18 | ||
| CA2432038A CA2432038C (en) | 2002-07-18 | 2003-06-12 | Borehole stabilization while drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2432038A1 true CA2432038A1 (en) | 2004-01-18 |
| CA2432038C CA2432038C (en) | 2011-05-10 |
Family
ID=31189052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2432038A Expired - Fee Related CA2432038C (en) | 2002-07-18 | 2003-06-12 | Borehole stabilization while drilling |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2432038C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112031674A (en) * | 2019-06-03 | 2020-12-04 | 中国石油天然气股份有限公司 | Device for automatically adjusting friction force of drill column in underground well |
| CN114233178A (en) * | 2021-12-15 | 2022-03-25 | 山东方大工程有限责任公司 | Rotary excavating machine drill bit for coal mine ground engineering construction |
| CN116066092A (en) * | 2023-02-03 | 2023-05-05 | 西南石油大学 | Shale formation collapse pressure increment prediction method based on hardness experiment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2396365A (en) | 2002-12-21 | 2004-06-23 | Schlumberger Holdings | Apparatus and method for compacting borehole walls |
-
2003
- 2003-06-12 CA CA2432038A patent/CA2432038C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112031674A (en) * | 2019-06-03 | 2020-12-04 | 中国石油天然气股份有限公司 | Device for automatically adjusting friction force of drill column in underground well |
| CN114233178A (en) * | 2021-12-15 | 2022-03-25 | 山东方大工程有限责任公司 | Rotary excavating machine drill bit for coal mine ground engineering construction |
| CN116066092A (en) * | 2023-02-03 | 2023-05-05 | 西南石油大学 | Shale formation collapse pressure increment prediction method based on hardness experiment |
| CN116066092B (en) * | 2023-02-03 | 2024-04-26 | 西南石油大学 | Shale formation collapse pressure increment prediction method based on hardness experiment |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2432038C (en) | 2011-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20180612 |