Claims
- 1. A fitting for controlled trajectory drilling of a drill-hole from a surface, the fitting being adapted to be fixed to the lower end of a drill string and comprising:
- a drilling tool located at the lower end of said fitting,
- a motor operatively connected to said drilling tool for rotationally driving said drilling tool,
- a variable geometry stabilizer including a remotely controlled means for causing the geometry of the variable geometry stabilizer to vary due to a change in fluid pressure within the drill string, and
- at least one fixed stabilizer and an elbow element,
- wherein said variable geometry stabilizer, said at least one fixed stabilizer and said elbow element are operatively associated with at least one of the motor and the drilling tool to cause the controlled trajectory drilling, and
- wherein said variable geometry stabilizer has an outside diameter at most equal to the outside diameter of said fixed stabilizer.
- 2. The fitting according to claim 1, wherein said elbow element is provided with a fixed angle.
- 3. A fitting according to claim 1, wherein said elbow element is provided with a variable angle.
- 4. A fitting according to claim 1, wherein said elbow element is integrated with said motor.
- 5. A fitting as claimed in one of claims 1, 2, 3 or 4, wherein said variable geometry stabilizer comprises means adapted for varying a distance between an axis of said fitting and a bearing surface of at least one blade of the variable geometry stabilizer.
- 6. A fitting according to claim 1, wherein said fixed stabilizer is interlocked for rotation with said drilling tool.
- 7. A fitting according to claim 1, wherein the fixed stabilizer is interlocked for rotation with a body of the motor.
- 8. A fitting according to claim 1, wherein said variable geometry stabilizer is connected to a drill string above said motor and two fixed stabilizers are placed one above and one below the variable geometry stabilizer.
- 9. A fitting according to claim 8, wherein said elbow element is integrated with said motor.
- 10. A fitting according to claim 1, wherein the fitting is fitted at the end of a drill string which is adapted to be rotatably driven by a surface drive means.
- 11. Drilling equipment including a fitting for controlled trajectory drilling of a drill-hole from the surface fixed to a lower end of a drill string, said fitting comprising:
- a drilling tool located at the lower end of said fitting,
- a motor operatively connected to said drilling tool for rotationally driving said drilling tool,
- a variable geometry stabilizer provided with a remotely controlled means for causing the geometry of the variable geometric stabilizer to vary due to a change in fluid pressure within the drill string, and
- at least one fixed stabilizer and an elbow element,
- wherein said variable geometry stabilizer, said at least one fixed stabilizer and said elbow element are operatively associated with at least one of the motor and the drilling tool to cause the controlled trajectory drilling, and
- wherein said variable geometry stabilizer has an outside diameter at most equal to an outside diameter of said fixed stabilizer.
- 12. Drilling equipment according to claim 11, wherein surface drive means are provided for rotatably driving said drill string.
- 13. A fitting for controlled trajectory drilling of a drill hole from the surface adapted to be fixed to the lower end of a drill string, said fitting comprising:
- a drilling tool located at the lower end of said fitting,
- a motor operatively connected to said drilling tool for rotationally driving said drilling tool,
- a variable geometry stabilizer provided with a remotely controlled means for causing the geometry of the variable geometry stabilizer to vary, said remotely controlled means being operatively associated with said drill string, and
- at least one fixed stabilizer and an elbow element,
- wherein said variable geometry stabilizer, said at least one fixed stabilizer and said elbow element are operatively associated with at least one of the motor and the drilling tool to cause the controlled trajectory drilling, and
- wherein the variable geometry stabilizer has an outside diameter at most equal to the outside diameter of the fixed stabilizer.
- 14. Drilling equipment including a fitting for controlled trajectory drilling of a drill hole from the surface to the lower end of a drill string, said fitting comprising:
- a drilling tool located at the lower end of said fitting,
- a motor operatively connected to said drilling tool for rotationally driving said drilling tool,
- a variable geometry stabilizer equipped with a remotely controlled means for causing the geometry of the variable geometry stabilizer to vary, said remotely controlled means being operatively associated with said drill string, and
- at least one fixed stabilizer and an elbow element,
- wherein said variable geometry stabilizer, and said elbow element is operatively associated with at least one of the motor and the drilling tool to cause a controlled trajectory drilling, and
- wherein the variable geometry stabilizer has an outside diameter at most equal to the outside diameter of said fixed stabilizer.
- 15. Drilling equipment according to claim 14, wherein said drill string is adapted to be rotably driven by a surface drive means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
88 17597 |
Dec 1988 |
FRX |
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Parent Case Info
This application is a Continuation application of application Ser. No. 459,129, filed Dec. 29, 1989 now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (2)
Number |
Date |
Country |
251543 |
Jan 1988 |
EPX |
8703329 |
Jun 1987 |
WOX |
Continuations (1)
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Number |
Date |
Country |
Parent |
459129 |
Dec 1989 |
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