wide area overshot

Abstract

The invention relates to a wide-range catch socket. The catch socket comprises a top joint, a circulation joint, an outer barrel and a lower joint which are connected in sequence, wherein a ball seat is arranged in the circulation joint. The catch socket is characterized in that the circulation joint is a three-connection four-way joint; a plurality of groups of circulation outlets are formed in the pipe wall of the circulation joint; a sand filter and an inner barrel are connected with the other end of the three-connection four-way joint; a cyclone separator is connected with the other end of the sand filter; the lower joint is a four-connection two-way joint; connecting threads with two diameters are respectively formed at the two ends of the four-connection two-way joint. The wide-range catch socket has the advantages as follows: the catch socket can implement local reverse circulation of the well section where the catch socket is positioned through pitching; metal chippings, formation sand and the like generated in the processes of casing milling, grinding milling and sand washing can be effectively and heavily collected and carried completely along with the catch socket to the well head; the catch socket can be matched with a bit hook to avoid the complicated situation in the normal direct circulation, solves the problem that the traditional small fallen substance bit hook cannot perform complete catching and carrying, greatly improves the operation efficiency and the success rate, and reduces the additional cost generated in the operation process.

Description

technical field [0001] The invention belongs to the technical field of oil field workover tools, in particular to a wide-area overshot. Background technique [0002] At present, during the salvage operation of offshore oil wells, a large amount of debris is often encountered, such as: metal debris after casing milling, cement debris after drilling plug, corroded pipe string debris and formation sand production etc., using conventional fishing cups or reverse circulation fishing baskets and other tools, due to single performance and no filtering function, it is usually impossible to completely clean the wellbore at one time, the sand flushing problem of horizontal wells and extended-reach wells, and the liner well in the upper casing. The problem of difficulty in cleaning the upper wellbore due to changes in annular return velocity. Moreover, the residual various kinds of broken and lumpy impurities bring more uncertainties to the subsequent salvage operations. SUMMARY OF ...

AI Technical Summary

Problems solved by technology

[0004] This wide-area overshot can effectively clean up all kinds of detritus impurities in the downhole by cooperating with other downhole operation tools, or can effectively clean up all kinds of debris in the downhole by throwing balls in the state of positive circulation sleeve (grinding) milling operation , Separation and collection, which solves the problem that the traditional small-scale fallen object fishing tools cannot be completely salvaged and carried. It can not only greatly improve the operation efficiency and success rate, but also save the additional cost generated during the operation process.

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