Anti-shock hydraulic release fishing spear

Abstract

The invention discloses an anti-shock hydraulic release fishing spear. The anti-shock hydraulic release fishing spear comprises a spear rod (1), the upper end of the spear rod is in threaded connection with the upper joint (2); the lower part of the spear rod is sleeved with a slip (3); the top end of the slip is in threaded connection with the slip seat (4); a lower limiting sleeve (5) is sleeved outside the slip bowl; the upper end of the lower limiting sleeve is in threaded connection with the lower end of a connecting sleeve (6); a salvage spring (10) is arranged in a gap between the top end of the slip and the lower end of the connecting sleeve; a middle sleeve (7) is arranged in an inner hole of the connecting sleeve; the upper end of the connecting sleeve is in threaded connection with an upper limiting sleeve (8); a piston (9), a balance spring (11) and a limiting ring (12) are sequentially arranged in a cavity between the upper limiting sleeve and the spear rod from bottom to top. And a return spring (13) is sleeved on the spear rod between the upper part of the upper limiting sleeve and the lower end of the upper joint. The slip can be prevented from loosening during jarring, and long-time jarring can be achieved after a fished falling object is fished.

Description

technical field [0001] The invention relates to an anti-shock hydraulic release fishing spear, which belongs to the technical field of fishing devices for downhole operations in oil fields. Background technique [0002] Existing fishing tools are retractable fishing tools, which usually consist of a retractable fishing spear, a male cone, a female cone, and the like. The working principle of the retractable fishing tool is to salvage the fallen fish by friction. If it is used for fishing in the horizontal well section, the fishing claws of the horizontal well enter the fish cavity, which may cause fishing failure because it is not affected by gravity. The reason is that due to the particularity of the wellbore structure of the horizontal well, the force of the pipe string is complicated, and the frictional resistance during lifting and lowering and rotation increases significantly. Torque cannot be effectively transferred directly to the fish. Therefore, in the salvage pr...

AI Technical Summary

Problems solved by technology

If it is used for fishing in the horizontal well section, the fishing claws of the horizontal well enter the fish cavity, which may cause fishing failure because it is not affected by gravity

The reason is that due to the particularity of the wellbore structure of the horizontal well, the force of the pipe string is complicated, and the frictional resistance during lifting and lowering and rotation increases significantly

Torque cannot be directly and effectively transmitted to the fish

Therefore, in the salvage process, it is often impossible to effectively salvage the fallen objects, and it is necessary to withdraw the salvage tool in time.

[0003] Conventional retractable fishing tools usually use the mechanism of rotation after hitting to withdraw. Under the limitation of the large curvature structure of the horizontal well, the fishing tool cannot be effectively withdrawn, and the success rate of withdrawing is less than 30%, resulting in high construction risks.

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