Apparatus and method for situ sharpening of bore hole bits |
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| 申请号 | US30422472 | 申请日 | 1972-11-06 | 公开(公告)号 | US3818997A | 公开(公告)日 | 1974-06-25 |
| 申请人 | CHRISTENSEN DIAMOND PROD CO; | 发明人 | BRIDWELL H; | ||||
| 摘要 | An impregnated diamond core bit is sharpened at the bottom of a bore hole, the bit being secured to the outer barrel of coring apparatus attached to a tubular drill string extending to the top of the bore hole. A sharpener is releasably mounted in the lower end of an inner core barrel lowered through the drill string into the outer barrel and latched thereto, with the sharpener projecting below the lower end of the core bit, the sharpener having nozzles for discharging abrasive material pumped through the sharpener against the drilling face of the bit to sharpen the same, whereupon the coring operation can be effected in the usual manner, the core releasing the sharpener from the inner barrel and pushing it upwardly along and within the inner barrel as the core is formed. The sharpener is retrieved with the inner barrel upon release of the latter from the outer barrel and its upward removal through the drill string to the top of the bore hole. | ||||||
| 权利要求 | 1. In apparatus for effecting sharpening of a drill bit at the lower portion of a drilling string disposed in a bore hole: a drive structure adapted to be secured to the drilling string and including a drill bit for drilling the bore hole; a sharpening device within said drive structure; means positioning said device in the drive structure with the device extending below the lower end of said drill bit, said device including means for enabling a sharpening action to be effected on said drill bit while the drive structure is in the bore hole; and releasing means for effecting release of said sharpening device with respect to said drive structure to allow said device to shift relatively upwardly in the drive structure to a position above the lower end of said drill bit to enable said lower end to engage the bottom of the bore hole. 2. In apparatus as defined in claim 1; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said sharpening device and allow said sharpening device to be shifted to said position above the lower end of the drill bit in response to downward movement of the drive structure in the bore hole. 3. In apparatus as defined in claim 1; said means for enabling a sharpening action to be effected including a plurality of fluid passages for directing fluent material upwardly against the lower end of said drill bit to sharpen the same. 4. In apparatus as defined in claim 1; said means for enabling a sharpening action to be effected including a plurality of fluid passages for directing fluent material upwardly against the lower end of said drill bit to sharpen the same; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said sharpening device and allow said sharpening device to be shifted to said position above the lower end of the drill bit in response to downward movement of the drive structure in the bore hole. 5. In apparatus as defined in claim 1; said positioning means being constructed and arranged to permit relative rotation between said drive structure and sharpening device to enable the sharpening action to be effected around the full circumference of said lower end of the drill bit. 6. In apparatus as defined in claim 1; said means for enabling a sharpening action to be effected including a plurality of fluid passages for directing fluent material upwardly against the lower end of said drill bit to sharpen the same; said positioning means being constructed and arranged to permit relative rotation between said drive structure and sharpening device to enable the fluent material to be directed against said lower end of the drill bit around the full circumference of said lower end. 7. In apparatus as defined in claim 1; said means for enabling a sharpening action to be effected including a plurality of fluid passages for directing fluent material upwardly against the lower end of said drill bit to sharpen the same; said positioning means being constructed and arranged to permit relative rotation between said drive structure and sharpening device to enable the fluent material to be directed against said lower end of the drill bit around the full circumference of said lower end; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said sharpening device and allow said sharpening device to be shifted to said position above the lower end of the drill bit in response to downward movement of the drive structure in the bore hole. 8. In apparatus for effecting sharpening of a core bit at the lower portion of a tubular drilling string disposed in a bore hole: an outer drive structure adapted to be secured to the drilling string and including a core bit for drilling upon the bottom of the bore hole to produce a core therein; an inner core barrel within the outer drive structure to receive the core; a sharpening device within said inner barrel; means positioning said device in said inner barrel with the device extending below the lower end of said core bit, said device including means for enabling a sharpening action to be effected on the lower end of said core bit while the apparatus is in the bore hole; and releasing means for effecting release of said device with resPect to said inner barrel to allow said device to shift relatively upwardly in said inner barrel to enable the lower end of said core bit to engage and act upon the bottom of the bore hole and produce the core. 9. In apparatus as defined in claim 8; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said device and allow said sharpening device to be shifted relatively upwardly in said inner barrel, the core formed engaging said sharpening device to relatively shift said sharpening device relatively upwardly within and along said inner barrel toward the upper end of said inner barrel. 10. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same. 11. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said device and allow said sharpening device to be shifted relatively upward in said inner barrel, the core formed engaging said sharpening device to relatively shift said sharpening device relatively upwardly within and along said inner barrel toward the upper end of said inner barrel. 12. In apparatus as defined in claim 8; said positioning means being constructed and arranged to permit relative rotation between said outer drive structure and said sharpening device to enable the sharpening action to be effected around the full circumference of said core bit. 13. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same; said positioning means being constructed and arranged to permit relative rotation between said outer drive structure and said sharpening device to enable the fluent material to be directed against said lower end of the core bit around the full circumference of said lower end. 14. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same; said positioning means being constructed and arranged to permit relative rotation between said outer drive structure and said sharpening device to enable the fluent material to be directed against said lower end of the core bit around the full circumference of said lower end; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said device and allow said sharpening device to be shifted relatively upwardly in said inner barrel, the core formed engaging said sharpening device to relatively shift said sharpening device relatively upwardly within and along said inner barrel toward the upper end of said inner barrel. 15. In apparatus as defined in claim 8; and means releasably securing said inner core barrel within said outer drive structure, whereby said inner core barrel and sharpening device are movable downwardly through the drilling string to operative position within the outer drive structure and upwardly from the outer drive structure through the drilling string to the top of the bore hole. 16. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same; said releasing means prOjecting below said sharpening device and being engageable with the bottom of the bore hole to release said device and allow said sharpening device to be shifted relatively upward in said inner barrel, the core formed engaging said sharpening device to relatively shift said sharpening device relatively upwardly within and along said inner barrel toward the upper end of said inner barrel; and means releasably securing said inner core barrel within said outer drive structure, whereby said inner core barrel and sharpening device are movable downwardly through the drilling string to operative position within the outer drive structure and upwardly from the outer drive structure through the drilling string to the top of the bore hole. 17. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said device and allow said sharpening device to be shifted relatively upward in said inner barrel, the core formed engaging said sharpening device to relatively shift said sharpening device relatively upwardly within and along said inner barrel toward the upper end of said inner barrel; means releasably securing said inner core barrel within said outer drive structure, whereby said inner core barrel and sharpening device are movable downwardly through the drilling string to operative position within the outer drive structure and upwardly from the outer drive structure through the drilling string to the top of the bore hole; and passage means for directing the fluent material from the drilling string through the inner barrel and outer drive structure for discharge through the circumferentially spaced passages. 18. In apparatus as defined in claim 8; said means for enabling a sharpening action to be effected including a plurality of circumferentially spaced passages for directing fluent material upwardly against the lower end of said core bit to sharpen the same; said releasing means projecting below said sharpening device and being engageable with the bottom of the bore hole to release said device and allow said sharpening device to be shifted relatively upward in said inner barrel, the core formed engaging said sharpening device to relatively shift said sharpening device relatively upwardly within and along said inner barrel toward the upper end of said inner barrel; means releasably securing said inner core barrel within said outer drive structure, whereby said inner core barrel and sharpening device are movable downwardly through the drilling string to operative position within the outer drive structure and upwardly from the outer drive structure through the drilling string to the top of the bore hole; and passage means for directing the fluent material from the drilling string through the inner barrel and outer drive structure for discharge through the circumferentially spaced passages; said core bit being an impregnated diamond bit having a lower drilling face against which the fluent material is directed to sharpen the same. 19. The method of sharpening a drill bit at the lower portion of a drilling string disposed in a bore hole, comprising lowering a sharpening device through the drilling string to a position in which the lower portion of the device extends below the lower end of the drill bit, and then directing a sharpening medium from said device against the drill bit to sharpen the same. 20. The method as defined in claim 19; in which the sharpening medium embodies a fluent material pumped from the sharpening device and directed from the device against the lower face of the drill bit. 21. The method as defined in claim 19; and relatively rotating the drill bit and sharpening device to direct the sharpening medium against the full circumference of the drill bit. 22. The method as defined in claim 19; the sharpening device having circumferentially spaced nozzles directed upwardly toward the lower face of the drill bit, the sharpening medium embodying a fluent material pumped through the nozzles against the lower drill bit face. 23. The method of sharpening a core bit connected to an outer drive structure secured to a tubular drilling string disposed in a bore hole, an inner core barrel being adapted to be disposed in the drive structure with a sharpening device located in the lower portion of the inner barrel and with the lower portion of the device extending below the lower end of the inner barrel, comprising lowering the inner barrel and device through the tubular drilling string to a position in which the inner barrel is disposed within the outer structure with the device extending below the lower face of the core bit, then directing a sharpening medium from said device against the lower face to sharpen the same, and shifting the device upwardly in the inner barrel to enable the core bit to contact the bottom of the bore hole and form the core for movement into the inner barrel. 24. The method as defined in claim 23; the sharpening device having circumferentially spaced nozzles directed upwardly toward the lower face of the drill bit, and pumping the sharpening medium which embodies a fluent material through the nozzles against the lower drill bit face. 25. The method as defined in claim 23, releasably securing the sharpening device in the lower portion of the inner barrel prior to lowering the inner barrel and device through the tubular drilling string, and lowering the apparatus in the bore hole, after the core bit has been sharpened, to engage the sharpening device with the bottom of the bore hole to release the sharpening device from the inner barrel and relatively move the sharpening device upwardly within the inner barrel. 26. The method as defined in claim 23; releasably securing the sharpening device in the lower portion of the inner barrel prior to lowering the inner barrel and device through the tubular drilling string, and lowering the apparatus in the bore hole, after the core bit has been sharpened, to engage the sharpening device with the bottom of the bore hole to release the sharpening device from the inner barrel and relatively move the sharpening device upwardly within the inner barrel; the sharpening device having circumferentially spaced nozzles directed upwardly toward the lower face of the drill bit, and pumping the sharpening medium which embodies a fluent material through the nozzles against the lower drill bit face. 27. The method as defined in claim 23; releasably securing the sharpening device in the lower portion of the inner barrel prior to lowering the inner barrel and device through the tubular drilling string, releasably securing the inner barrel within the outer structure with the sharpening device projecting below the lower face of the core bit, lowering the apparatus in the bore hole, after the core bit has been sharpened, to engage the sharpening device with the bottom of the bore hole to release the sharpening device from the inner barrel and relatively move the sharpening device upwardly within the inner barrel, and releasing the inner barrel to permit the inner barrel, sharpening device and core in the inner barrel to be withdrawn through the drilling string to the top of the bore hole. 28. The method as defined in claim 23; releasably securing the sharpening device in the lower portion of the inner barrel prior to lowering the inner barrel and device through the tubular drilling string, releasably securing the inner barrel within the outer structure with the sharpening device projecting below the lower face of the core bit, lowering the apparatus in the bore hole, after the core bit has been sharpened, to engage the sharpening device with the bottom of the bore hole to release the sharpening device from the inner barrel and relatively move the sharpening device upwArdly within the inner barrel, and releasing the inner barrel to permit the inner barrel, sharpening device and core in the inner barrel to be withdrawn through the drilling string to the top of the bore hole; the sharpening device having circumferentially spaced nozzles directed upwardly toward the lower face of the drill bit, and pumping the sharpening medium which embodies a fluent material through the nozzles against the lower drill bit face. 29. The method as defined in claim 23; releasably securing the sharpening device in the lower portion of the inner barrel prior to lowering the inner barrel and device through the tubular drilling string, releasably securing the inner barrel within the outer structure with the sharpening device projecting below the lower face of the core bit, lowering the apparatus in the bore hole, after the core bit has been sharpened, to engage the sharpening device with the bottom of the bore hole to release the sharpening device from the inner barrel and relatively move the sharpening device upwardly within the inner barrel, and releasing the inner barrel to permit the inner barrel, sharpening device and core in the inner barrel to be withdrawn through the drilling string to the top of the bore hole; the sharpening device having circumferentially spaced nozzles directed upwardly toward the lower face of the drill bit, pumping the sharpening medium which embodies a fluent material through the nozzles against the lower drill bit face, and rotating the drilling string and core bit with respect to the inner barrel and sharpening device to direct the fluent material against the full circumference of the lower face of the drill bit. |
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