Positive rotation cleanout apparatus and method |
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| 申请号 | US18887671 | 申请日 | 1971-10-13 | 公开(公告)号 | US3809161A | 公开(公告)日 | 1974-05-07 |
| 申请人 | WILSON IND INC; | 发明人 | CAROTHERS W; | ||||
| 摘要 | Apparatus for retrieving drill pipe, drilling tools, or other equipment stuck in a well bore has a selectively insertable, positively rotating drill bit which can clean out the box end of a collar or tool to enable a fishing string to engage the stuck object, and can clean out the bore of a well pipe to enable lowering therethrough of an explosive charge as an aid to retrieving the stuck object. A method for retrieving drill pipe, drilling tools, or other equipment stuck in a well bore is also provided. | ||||||
| 权利要求 | 1. In apparatus for retrieving equipment stuck in a well bore and including: a fishing string adapted to be lowered within the well bore and having a central bore therethrough; and engaging means at the lower end of the fishing string for engaging the stuck equipment; the improvement comprising: drill means adapted to be selectively lowered through the bore of the fishing string and having: a central bore therethrough communicating with the bore of the fishing string; and a drill bit at the lower end of the drill means for drilling out material plugging the bore of the stuck equipment; and drive means comprising a passage of substantially noncircular internal cross section within the bore of the fishing string, said passage being adapted to receive a mating region of substantially similar exterior cross section extending over a portion of the length of the drill means to prevent relative rotational motion between the fishing string and the drill means. 2. Apparatus as recited in claim 1 wherein the mating noncircular elements are suBstantially hexagonal in cross-sectional configuration. 3. In apparatus for retrieving equipment stuck in a well bore and including: a fishing string adapted to be lowered within the well bore and having a central bore therethrough; and engaging means at the lower end of the fishing string for engaging the stuck equipment; the improvement comprising: drill means adapted to be selectively lowered through the bore of the fishing string and having: a central bore therethrough communicating with the bore of the fishing string; and a drill bit at the lower end of the drill means for drilling out material plugging the bore of the stuck equipment; drive means disposed near the lower end of the fishing string for forming a positive rotational driving connection between the drill means and the fishing string when the drill means is engaged with the drive means; and selective rotation means incorporated in the fishing string at a location below the drive means for permitting the selective relative rotation of that portion of the fishing string above said selective rotation means with respect to that portion of the fishing string below said selective rotation means. 4. Apparatus as recited in claim 3 wherein said selective rotation means is a slip spline joint. 5. In apparatus for retrieving equipment stuck in a well bore and including: a fishing string adapted to be lowered within the well bore and having a central bore therethrough; and engaging means at the lower end of the fishing string for engaging the stuck equipment; the improvement comprising: drill means adapted to be selectively lowered through the bore of the fishing string and having: a central bore therethrough communicating with the bore of the fishing string; and a drill bit at the lower end of the drill means for drilling out material plugging the bore of the stuck equipment; drive means disposed near the lower end of the fishing string for forming a positive rotational driving connection between the drill means and the fishing string when the drill means is engaged with the drive means; and seal means disposed between the exterior of the drill means and the interior of the fishing string to permit application of a downward fluid pressure on the drill means. 6. Apparatus as recited in claim 5 wherein said seal means comprises a resilient wiper disposed around said drill means and adapted to provide a seal between said drill means and the interior of said fishing string. 7. In apparatus for retrieving equipment stuck in a well bore and including: a fishing string adapted to be lowered within a well bore and having a central bore therethrough; engaging means at the lower end of the fishing string for engaging the stuck equipment; and selective rotation means disposed near the lower end of the fishing string for permitting the rotation of that part of the fishing string above said selective rotation means independent of that part of the fishing string below said selective rotation means; the improvement comprising: drill means adapted to be selectively lowered through and removed from the bore of the fishing string and having: a central bore extending entirely therethrough and communicating with the bore of the fishing string; a drill bit at the lower end of the drill means and extending below the lowermost surface of the fishing string for drilling out material plugging the bore of the stuck equipment; means forming a positive rotational driving connection between the drill means and a corresponding drive means disposed above the selective rotation means in the fishing string; and means producing a downward force on the drill means responsive to flow of drilling fluid therethrough. 8. In apparatus for retrieving equipment stuck in a well bore and including: a fishing string adapted to be lowered within a well bore and having a central bore therethrough; aNd engaging means at the lower end of the fishing string for engaging the stuck equipment; the improvement comprising: a drive sub adapted to be disposed near the lower end of the fishing string and having a central bore therethrough communicating with the bore of the fishing string; means defining a noncircular passage within the bore of the drive sub; drill means adapted to be selectively lowered through and removed from the fishing string and having: a central bore therethrough communicating with the bore of the fishing string; a drill bit at the lower end of the drill means and extending below the lowermost surface of the fishing string; an upper section of substantially the same external diameter as the diameter of the bore of the fishing string above the drive sub, the lower end of said upper section being adapted to sit on an upwardly facing shoulder in the fishing string to prevent passage of the drill means through the fishing string; and a lower section having a noncircular exterior cross section of mating configuration with the non-circular passage in the drive sub for forming an engagement therewith, whereby rotation of the fishing string will rotate the drill means. 9. Apparatus as recited in claim 8 wherein the lowermost portion of said lower section comprises a pilot section to orient said drill means in said noncircular passage. 10. Apparatus as recited in claim 8 wherein aligning means are provided for bringing the noncircular elements into alignment as the drill means is lowered through the noncircular passage defined within the drive sub. 11. Apparatus as recited in claim 10 wherein said aligning means comprises cooperating inclined surfaces on said drill means and said drive sub adapted to align said lower section with said noncircular passage. 12. The method of retrieving stuck equipment having a plugged bore from a well bore, including the steps of: lowering into the well bore a fishing string having engaging means at the lower end thereof for engaging the stuck equipment; lowering drill means, having a drill bit at its lower end, downwardly through the fishing string to a position where the drill bit rests on the material plugging the bore of the stuck equipment; forming a positive rotational driving connection between said drill means and the fishing string; rotating the drill means to drill out the material plugging the bore of the stuck equipment; engaging the stuck equipment with the engaging means at the lower end of the fishing string; and manipulating the fishing string after the stuck equipment has been engaged to exert forces on the stuck equipment. 13. The method as recited in claim 12 including the step of maintaining downward fluid pressure on said drill means during rotation thereof. 14. The method as recited in claim 12 including the step of providing a flow of drilling fluid to said drill means during the drilling out of the plugging material to wash debris from the stuck equipment. 15. The method as recited in claim 12 including, after engaging the stuck equipment with the fishing string, the further steps of: drilling out material plugging the bore of the fish to a free joint thereof; lowering an explosive charge downwardly through the fishing string to a position adjacent said free joint of the stuck equipment and exploding the charge; and pulling the fishing string with the unstuck equipment engaged therewith out of the well bore. 16. The method as recited in claim 15 wherein the explosive charge is lowered through the drill means into position within the stuck equipment. 17. Apparatus for use in retrieving equipment stuck in a well bore, comprising: drill means adapted to be selectively lowered through and removed from the bore of a fishing string, said drill means having: a central bore therethrough communicating with the bore of the fishing string; a drill bit at the lower end of The drill means for drilling out material from the bore of the stuck equipment; an upper section including means adapted to sit on an upwardly facing shoulder in the fishing string to prevent passage of the drill means through the fishing string; a lower section including a noncircular exterior cross section adapted to mate with a corresponding noncircular passage in the fishing string to form a positive rotational driving connection therewith; and means for producing a downward force on the drill means when drilling fluid is flowed through the bore thereof. 18. Apparatus as recited in claim 17, wherein said means for producing a downward force on the drill means comprises a seal disposed about the exterior of the drill means and adapted to seal against the interior of the fishing string when the drill means is within the bore of the fishing string, whereby flow of drilling fluid downwardly within the bore of the fishing string will produce said downward force. |
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