CA2600600A1 - Method and apparatus for directional drilling with variable drill string rotation - Google Patents
Method and apparatus for directional drilling with variable drill string rotation Download PDFInfo
- Publication number
- CA2600600A1 CA2600600A1 CA 2600600 CA2600600A CA2600600A1 CA 2600600 A1 CA2600600 A1 CA 2600600A1 CA 2600600 CA2600600 CA 2600600 CA 2600600 A CA2600600 A CA 2600600A CA 2600600 A1 CA2600600 A1 CA 2600600A1
- Authority
- CA
- Canada
- Prior art keywords
- drill string
- borehole
- drilling
- angular
- velocity profile
- 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
- 238000000034 method Methods 0.000 title claims abstract 18
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/068—Deflecting the direction of boreholes drilled by a down-hole drilling motor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
Apparatus and methodology is provided for directional drilling which avoid the effects of static friction between the drill string and the borehole. The drill string is rotated continuously in one direction during rotating drilling and during steering. During steering, the rotary speed of the drill string is varied within a revolution and substantially similarly for each of a plurality of subsequent revolutions. The drill string is be rotated very slowly when oriented at or near the desired orientation to achieve the desired change in direction and then rotated much faster during the balance of each revolution. This angular velocity profile results in drilling at or near a desired orientation for a high percentage of the time it takes for each revolution. Changes in an effective tool-face orientation can be effected by shifting the phase of the velocity profile.
Claims (19)
1. A method of drilling along a desired trajectory for at least a portion of a borehole in a subterranean formation comprising:
rotating a drill string from surface, the drill string extending downhole along the borehole;
supporting a drill bit at a distal end of the drill string, the drill bit being angularly deviated from an axis of the distal end of the drill string;
rotating the drill bit relative to the drill string for drilling the borehole;
and continuously rotating the drill string in one direction and varying the angular velocity of the rotation of the drill string within each revolution between at least a fast and a slow angular velocity, and varying the angular velocity of the rotation of the drill string substantially similarly for each of a plurality of revolutions wherein the drilling of the borehole is steered along the desired trajectory.
rotating a drill string from surface, the drill string extending downhole along the borehole;
supporting a drill bit at a distal end of the drill string, the drill bit being angularly deviated from an axis of the distal end of the drill string;
rotating the drill bit relative to the drill string for drilling the borehole;
and continuously rotating the drill string in one direction and varying the angular velocity of the rotation of the drill string within each revolution between at least a fast and a slow angular velocity, and varying the angular velocity of the rotation of the drill string substantially similarly for each of a plurality of revolutions wherein the drilling of the borehole is steered along the desired trajectory.
2. The method of claim 1 wherein the varying of the angular velocity of the rotation of the drill string within a revolution has a velocity profile, the method further comprising:
comparing an actual trajectory of the borehole to the desired trajectory for determining a corrective angular offset therebetween; and shifting the velocity profile by the corrective angular offset.
comparing an actual trajectory of the borehole to the desired trajectory for determining a corrective angular offset therebetween; and shifting the velocity profile by the corrective angular offset.
3. The method of claim 1 wherein the varying of the angular velocity of the rotation of the drill string within a revolution has a velocity profile, the method further comprising:
establishing an actual trajectory of the borehole;
determining an effective tool-face orientation for re-establishing the desired trajectory and having an corrective angular offset from the desired trajectory; and shifting the velocity profile by the corrective angular offset.
establishing an actual trajectory of the borehole;
determining an effective tool-face orientation for re-establishing the desired trajectory and having an corrective angular offset from the desired trajectory; and shifting the velocity profile by the corrective angular offset.
4. The method of claim 1 wherein the varying of the angular velocity of the rotation of the drill string within a revolution has a velocity profile, the method further comprising:
establishing an angular reference point of the drill string at surface;
and applying the velocity profile relative to the angular reference point.
establishing an angular reference point of the drill string at surface;
and applying the velocity profile relative to the angular reference point.
5. The method of claim 4 wherein further comprising:
comparing an actual trajectory of the borehole with a desired trajectory for determining an angular offset therebetween;
shifting the velocity profile, relative to the angular reference point, by the angular offset.
comparing an actual trajectory of the borehole with a desired trajectory for determining an angular offset therebetween;
shifting the velocity profile, relative to the angular reference point, by the angular offset.
6. The method of claim 4 wherein during drilling of the borehole the drill string and the borehole incrementally increases in length, further comprising:
estimating an incremental angular offset for each incremental increase in length; and for each incremental increase in length, shifting the velocity profile, relative to the angular reference point, by the estimated incremental angular offset.
estimating an incremental angular offset for each incremental increase in length; and for each incremental increase in length, shifting the velocity profile, relative to the angular reference point, by the estimated incremental angular offset.
7. The method of claim 1 further comprising:
drilling an incremental portion of the borehole;
comparing an actual trajectory of the incremental portion with a desired trajectory for determining a corrective angular offset therebetween;
and shifting the velocity profile by the angular offset; and applying the shifted velocity profile to the drilling string at surface.
drilling an incremental portion of the borehole;
comparing an actual trajectory of the incremental portion with a desired trajectory for determining a corrective angular offset therebetween;
and shifting the velocity profile by the angular offset; and applying the shifted velocity profile to the drilling string at surface.
8. The method of claim 7 further comprising:
establishing steady-state drilling parameters while drilling the incremental portion; and maintaining the steady-state drilling parameters while applying the shifted velocity profile.
establishing steady-state drilling parameters while drilling the incremental portion; and maintaining the steady-state drilling parameters while applying the shifted velocity profile.
9. The method of claim 7 wherein comprising temporarily slowing the rotation of the drill string to a stop for determining the actual trajectory of the incremental portion.
10. The method of claim 7 further comprising:
estimating incremental changes to the steady-state drilling parameters as the borehole is drilled;
estimating an incremental angular offset due to the estimated incremental changes; and further shifting the velocity profile by the incremental angular offset.
estimating incremental changes to the steady-state drilling parameters as the borehole is drilled;
estimating an incremental angular offset due to the estimated incremental changes; and further shifting the velocity profile by the incremental angular offset.
11. The method of claim 1 further comprising:
drilling an interval portion of the borehole;
comparing an actual trajectory of the interval portion with a desired trajectory for determining an angular offset therebetween; and shifting the velocity profile by the angular offset;
applying the shifted velocity profile to the drilling string at surface;
increasing the length of the interval portion of the borehole to be drilled; and repeating the drilling of the interval portion of the borehole.
drilling an interval portion of the borehole;
comparing an actual trajectory of the interval portion with a desired trajectory for determining an angular offset therebetween; and shifting the velocity profile by the angular offset;
applying the shifted velocity profile to the drilling string at surface;
increasing the length of the interval portion of the borehole to be drilled; and repeating the drilling of the interval portion of the borehole.
12. The method of claim 2 wherein the drill bit has an effective tool-face orientation which is angularly deviated from the axis of the distal end of the drill string, the method further comprising adjusting the orientation of the effective tool-face orientation by shifting the velocity profile by the corrective angular offset.
13. Apparatus for drilling along a desired trajectory for at least a portion of a borehole in a subterranean formation comprising:
a drill string extending from surface and downhole along the borehole;
a bottom hole assembly supported at a downhole end of the drill string comprising a motor and a drill bit, the drill bit being angularly deviated from an axis of the drill string and rotatable by the motor relative to the drill string for drilling the borehole;
a rotary drive at surface continuously rotating the drill string in one direction; and a controller coupled to the rotary drive for varying the angular velocity of the rotation of the drill string within each revolution between at least a fast and a slow rotation, and varying the angular velocity of the rotation of the drill string substantially similarly for each of a plurality of revolutions wherein the drilling of the borehole is steered along the desired trajectory.
a drill string extending from surface and downhole along the borehole;
a bottom hole assembly supported at a downhole end of the drill string comprising a motor and a drill bit, the drill bit being angularly deviated from an axis of the drill string and rotatable by the motor relative to the drill string for drilling the borehole;
a rotary drive at surface continuously rotating the drill string in one direction; and a controller coupled to the rotary drive for varying the angular velocity of the rotation of the drill string within each revolution between at least a fast and a slow rotation, and varying the angular velocity of the rotation of the drill string substantially similarly for each of a plurality of revolutions wherein the drilling of the borehole is steered along the desired trajectory.
14. The apparatus of claim 13 wherein the controller is mechanically coupled to the rotary drive.
15. The apparatus of claim 13 wherein:
the controller is coupled to a variable speed drive, and the rotary drive further comprises at least a variable speed motor.
the controller is coupled to a variable speed drive, and the rotary drive further comprises at least a variable speed motor.
16. The apparatus of claim 15 wherein the controller and the variable speed drive are one and the same.
17. The apparatus of claim 15 wherein:
the variable speed motor is at least one hydraulic motor for rotatably driving the drill string, and the apparatus further comprises a hydraulic pump hydraulically coupled to the at least one hydraulic motor.
the variable speed motor is at least one hydraulic motor for rotatably driving the drill string, and the apparatus further comprises a hydraulic pump hydraulically coupled to the at least one hydraulic motor.
18. The apparatus of claim 17 wherein the hydraulic pump is a fixed displacement hydraulic pump driven by a variable speed AC electric motor.
19. The apparatus of claim 17 wherein the hydraulic pump is a variable displacement pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2600600A CA2600600C (en) | 2007-09-06 | 2007-09-06 | Method and apparatus for directional drilling with variable drill string rotation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2600600A CA2600600C (en) | 2007-09-06 | 2007-09-06 | Method and apparatus for directional drilling with variable drill string rotation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2600600A1 true CA2600600A1 (en) | 2009-03-06 |
| CA2600600C CA2600600C (en) | 2011-05-24 |
Family
ID=40409996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2600600A Expired - Fee Related CA2600600C (en) | 2007-09-06 | 2007-09-06 | Method and apparatus for directional drilling with variable drill string rotation |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2600600C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107456A (en) * | 2021-04-02 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Method and device for controlling inclination angle of drill hole in coal mine underground composite drilling |
| CN115822451A (en) * | 2022-06-28 | 2023-03-21 | 中国石油天然气集团有限公司 | Detachable directional drilling tool combined structure and directional drilling method |
| US11767749B2 (en) | 2020-04-15 | 2023-09-26 | Ensign Drilling Inc | Inertial compensation for a quill oscillator |
-
2007
- 2007-09-06 CA CA2600600A patent/CA2600600C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11767749B2 (en) | 2020-04-15 | 2023-09-26 | Ensign Drilling Inc | Inertial compensation for a quill oscillator |
| CN113107456A (en) * | 2021-04-02 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Method and device for controlling inclination angle of drill hole in coal mine underground composite drilling |
| CN115822451A (en) * | 2022-06-28 | 2023-03-21 | 中国石油天然气集团有限公司 | Detachable directional drilling tool combined structure and directional drilling method |
| CN115822451B (en) * | 2022-06-28 | 2024-03-22 | 中国石油天然气集团有限公司 | Disengageable directional drilling tool assembly structure and directional drilling method |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2600600C (en) | 2011-05-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20220906 |