Claims
- 1. A drilling liner system for use in continued drilling of a borehole having a casing therein, the casing having a drilling tubular inside and a liner hanger/packer assembly at the bottom, the drilling liner system comprising:(a) a tubular coupled to the drilling tubular and to an inner bottom hole assembly, the inner bottom hole assembly including: (i) a drilling motor coupled to the tubular and adapted to be operated by mud conveyed by said tubular; and (ii) a drive shaft on the drilling motor coupled to a male sub with retractable drive splines thereon, the male sub coupled to a pilot bit for drilling a pilot hole upon operation of the drilling motor; and (b) a liner coupled at a first end to the liner hanger/packer and at a second end to an outer bottom hole assembly, the outer bottom hole assembly including: (i) a female sub adapted to engage drive splines on the male sub and rotate with the male sub upon being engaged thereto, and (ii) a core bit surrounding the pilot bit and coupled to the female sub for drilling an enlarged hole.
- 2. The drilling liner system of claim 1 further comprising a landing sub with splines thereon for ensuring proper alignment of the inner bottom hole assembly and the outer bottom hole assembly.
- 3. The drilling liner system of claim 1 further comprising a suspension and bearing sub for providing longitudinal length suspension and radial guidance and isolating the rotation of the female sub from the liner.
- 4. The drilling liner system of claim 1 further comprising an MWD device having a non-magnetic liner in the tubular for providing directional measurements, and devices to facilitate directional drilling on the inner bottom hole assembly and the outer bottom hole assembly.
- 5. The drilling liner system of claim 4 wherein the devices to facilitate directional drilling further comprise(I) a flex shaft between the motor and the male sub, and, (II) a bent sub on the outer bottom hole assembly above the female sub, said bent sub selected from (i) an AKO, and (ii) a fixed angle.
- 6. The drilling system of claim 4 further comprising a casing packer located below the liner hanger/packer and an open hole packer located close to the core bit, said casing packer and open hole packer preventing the flow of drilling fluids into an annulus between the liner and the borehole.
- 7. The drilling system of claim 1 further comprising an MWD device in the inner bottom hole assembly to provide directional measurements, and a plurality of retractable pads on the outside of the outer bottom hole assembly, said retractable pads adapted to engage the borehole wall and guide the drilling system in a desired direction in inclination and azimuth.
- 8. The drilling system of claim 7 further comprising a casing packer located below the liner hanger/packer and an open hole packer located close to the core bit, said casing packer and open hole packer preventing the flow of drilling fluids into an annulus between the liner and the borehole.
- 9. The drilling system of claim 1 further comprising a casing packer located below the liner hanger/packer and an open hole packer located close to the core bit, said casing packer and open hole packer preventing the flow of drilling fluids into an annulus between the liner and the borehole.
- 10. The drilling system of claim 1 further comprising a reamer on the outside of the outer bottom hole assembly, said reamer adapted to enlarge the hole drilled by the core bit.
- 11. The drilling system of claim 1 wherein at least one of (i) the core bit, and (ii) the pilot bit is expandable.
- 12. The drilling system of claim 1 wherein the pilot bit further comprises high pressure jetting nozzles.
- 13. The drilling liner system of claim 1 wherein the drilling tubular is selected from the group consisting of (i) a drill pipe, and (ii) coiled tubing.
- 14. A drilling liner system for use in continued drilling of a borehole having a casing therein, the casing having a drilling tubular and a liner hanger/packer assembly at the bottom, the drilling liner system comprising:(a) an inner bottom hole assembly including: (i) a drilling motor adapted to be operated by mud conveyed downhole by the drilling tubular; and (ii) a drive shaft on the drilling motor coupled to a male sub with retractable drive splines thereon, the male sub coupled to a pilot bit for drilling a pilot hole upon operation of the drilling motor; (b) a liner coupled at a first end to the liner hanger/packer and the drilling tubular, and at a second end to an outer bottom hole assembly, the outer bottom hole assembly including: (i) a female sub adapted to engage the drive splines on the male sub and rotate with the male sub upon being engaged thereto, and (ii) a core bit surrounding the pilot bit and coupled to the female sub for drilling an enlarged hole; and (c) a releasing tool for releasably coupling the inner bottom hole assembly to the liner.
- 15. The drilling liner system of claim 14 further comprising a fishable joint on the releasing tool for facilitating retrieval of the inner bottom hole assembly from the borehole.
- 16. The drilling liner system of claim 14 further comprising an MWD device in the inner bottom hole assembly to provide directional measurements and devices on the inner and outer bottom hole assemblies to facilitate directional drilling.
- 17. The drilling system of claim 14 further comprising an MWD device in the inner bottom hole assembly to provide directional measurements, and a plurality of retractable pads on the outside of the outer bottom hole assembly, said retractable pads adapted to engage the borehole wall and guide the drilling system in a desired direction in inclination and azimuth.
- 18. The drilling system of claim 14 further comprising a casing packer located below the liner hanger/packer and an open hole packer located close to the core bit, said casing packer and open hole packer preventing the flow of drilling fluids into an annulus between the liner and the borehole.
- 19. The drilling system of claim 14 further comprising a reamer on the outside of the outer bottom hole assembly, said reamer adapted to enlarge the hole drilled by the core bit.
- 20. The drilling system of claim 14 wherein at least one of (i) the core bit, and (ii) the pilot bit is expandable.
- 21. The drilling system of claim 14 wherein the pilot bit further comprises high pressure jetting nozzles.
- 22. The drilling liner system of claim 14 wherein the drilling tubular is selected from the group consisting of (i) a drill pipe, and (ii) coiled tubing.
- 23. A drilling liner system for use in continued drilling of a borehole having a casing therein, a drilling tubular inside the casing, and a liner hanger/packer assembly at the bottom of the casing, the drilling liner system comprising:(a) a tubular coupled to the drilling tubular and to an inner bottom hole assembly, the inner bottom hole assembly including: (i) a drilling motor coupled to the tubular and adapted to be operated by mud carried by said tubular; (ii) a thruster coupled to a drive shaft on the drilling motor and to a male sub, the thruster adapted to extend and retract the position of the male sub relative to the drilling motor (iii) retractable drive splines on the male sub, and (iv) a pilot bit coupled to the male sub for drilling a pilot hole upon operation of the drilling motor; and (b) a liner coupled at a first end to the liner hanger/packer and at a second end to an outer bottom hole assembly, the outer bottom hole assembly including: (i) a female sub adapted to engage drive splines on the male sub and rotate with the male sub upon being engaged thereto, (ii) a core bit surrounding the pilot bit and coupled to the female sub for drilling an enlarged hole, and (iii) a telescopic suspension sub coupled to the drilling motor and the female sub, said telescopic sub adapted to move the female sub in conjunction with the motion of the thruster.
- 24. A method of drilling a borehole comprising:(a) setting a casing in a section of the borehole; (b) passing a drilling tubular through the casing and a liner hanger/packer assembly at the bottom of the casing; (c) operating a drilling motor coupled to a lower end of the tubular by passing mud carried by said tubular; (d) coupling a first end of a liner to the liner hanger/packer and at a second end to an outer bottom hole assembly; (e) coupling a drive shaft on the drilling motor to a male sub with retractable drive splines thereon and to a pilot bit for drilling a pilot hole upon operation of the drilling motor; (f) engaging a female sub on the outer bottom hole assembly to the drive splines on the male sub and rotating with the male sub upon being engaged thereto, thereby operating a core bit on the outer bottom hole assembly for drilling an enlarged hole.
- 25. The method of claim 24 further comprising using an MWD device in the tubular for providing directional measurements, and using such directional information on devices on the inner bottom hole assembly and the outer bottom hole assembly for directional drilling.
- 26. The method of claim 24 further comprising using an MWD device in the inner bottom hole assembly to provide directional measurements, and using a plurality of retractable pads on the outside of the outer bottom hole assembly to engage the borehole wall and guide the pilot bit and the core bit in a desired direction in inclination and azimuth.
- 27. The method of claim 24 further comprising using a casing packer located below the liner hanger/packer and an open hole packer located close to the core bit for preventing the flow of drilling fluids into an annulus between the liner and the borehole.
- 28. The method of claim 24 further comprising a using reamer on the outside of the outer bottom hole assembly, said reamer adapted to enlarge the hole drilled by the core bit.
- 29. The method of claim 24 wherein at least one of (i) the core bit, and (ii) the pilot bit is expandable.
- 30. The method of claim 24 further comprising using high pressure jetting nozzles on the core bit to facilitate drilling.
- 31. The method of claim 24 further comprising using a thruster on the inner bottom hole assembly to move the male sub relative to the drilling motor and using a telescopic suspension sub on the outer bottom hole assembly to maintain engagement between the female sub and the drive splines on the male sub.
- 32. A method of drilling a borehole comprising:(a) setting a casing in a section of the borehole; (b) coupling a first end of a liner to a liner hanger/packer at the bottom of the casing; (c) coupling a second end of the liner to an outer bottom hole assembly having a core bit thereon; (d) using a releasing tool to couple the outer bottom hole assembly to an inner bottom hole assembly having a mud motor therein; (e) coupling a drive shaft on the drilling motor to a male sub with retractable drive splines thereon and to a pilot bit for drilling a pilot hole upon operation of the drilling motor; (f) engaging a female sub on the outer bottom hole assembly to the drive splines on the male sub thereby enabling the core bit to drill an enlarged hole upon operation of the drilling motor; (g) conveying mud through a drilling tubular in the casing through the liner hanger/packer into the liner and using the mud to operate the drilling motor, thereby causing the pilot bit to drill a pilot hole and the core bit to drill an enlarged hole.
- 33. The method of claim 32 further comprising operating the releasing tool to decouple the inner bottom hole assembly from the outer bottom hole assembly, and using a fishing hook on the inner bottom hole assembly to retrieve the inner bottom hole assembly from the borehole.
Priority Claims (1)
Number |
Date |
Country |
Kind |
95116867 |
Oct 1995 |
EP |
|
CROSS REFERENCES TO RELATED APPLICATIONS
This application claims priority from the EP application, Application Number 95116867.4, filed with the European Patent Office on Oct. 9, 1995. It is a continuation-in-part of U.S. patent application Ser. No. 08/729,226 filed on Oct. 9, 1996, now U.S. Pat. No. 5,845,722.
US Referenced Citations (9)
Foreign Referenced Citations (4)
Number |
Date |
Country |
3839 760 |
Jan 1990 |
DE |
3902 868 |
Jun 1990 |
DE |
0 265 344 |
Apr 1988 |
EP |
0 462 618 |
Dec 1991 |
EP |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08/729226 |
Oct 1996 |
US |
Child |
09/205969 |
|
US |