| 摘要 |
Apparatus for use on a non-rigid workstring for retrieving a downhole tool, comprising a jar (204); a swivel (202) threadedly connected to said jar (204); a safety release sub (200) threadedly connected to said swivel (202), containing at least one shear pin; a power mandrel (l00) threadedly connected to said safety release sub; means (l28,l40,l29,l32,l42,l34,l36), adapted to said power mandrel (l00), for latching said apparatus to said downhole tool; and overshot means (l52) cooperating with said power mandrel, for guiding said apparatus over said downhole tool. <IMAGE> <IMAGE> |
