Downhole salvaging device

Abstract

The invention relates to a downhole salvaging device, and belongs to the technical field of petroleum well-drilling salvaging tools. An upper joint is mounted on a guiding pup joint through a middle pup joint in a threaded mode. A bearing disc is fixedly mounted in the middle pup joint. A bearing pin is mounted on the bearing disc. A sliding locking sleeve is mounted on the bearing pin. A gripperhinging seat is mounted on the position, on the lower portion of the sliding locking sleeve, of the bearing pin through a pressing nut. A plurality of grippers are evenly distributed on the circumference of the gripper hinging seat through pin shafts. When the downhole salvaging device works, the grippers are compressed to collapsed inwards through sliding downwards-moving of the sliding locking sleeve, so that a to-be-salvaged tool is clamped fully, remaining drilling tools in a well can be tripped out conveniently in time, and thus salvaging reliability is greatly improved; the problem thatexiting drilling tools are buried and consequently the property loss is caused is solved; and the downhole salvaging device is simple in structure, reasonable in design and especially suitable for downhole drilling tool salvaging.

Description

technical field [0001] The invention relates to a downhole fishing device, belonging to the technical field of oil drilling and fishing tools. Background technique [0002] In oil drilling, it is often impossible to determine the structure of the stratum, and it is necessary to drill the bottom layer tentatively. Because the geological design does not match the actual working conditions, jamming often occurs in some well sections; once jamming occurs , Usually cause downhole accidents such as drill pipe breakage and drill bit drop. If the remaining drilling tools in the well cannot be pulled out in time, important drilling tools such as drill bits and impactors will be buried, resulting in great property losses. Contents of the invention [0003] The object of the present invention is to provide a downhole fishing device with simple structure and reasonable design, which can conveniently and timely lift out the remaining drilling tools in the well to avoid property loss ca...

AI Technical Summary

Problems solved by technology

[0002] In oil drilling, it is often impossible to determine the structure of the stratum, and it is necessary to drill the bottom layer tentatively. Because the geological design does not match the actual working conditions, jamming often occurs in some well sections; once jamming occurs , usually cause downhole accidents such as drill pipe breakage and drill bit drop. If the remaining drilling tools in the well cannot be pulled out in time, important drilling tools such as drill bits and impactors will be buried, resulting in great property losses.

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