Steel wire fish catcher through variable diameter pipe string

Abstract

The invention relates to the technical field of fishing tools in oil and gas field drilling, and is a fishing tool for fish falling through a variable diameter pipe string steel wire, which includes a protective tube, an expanded inner fishing spear, a cable and a cable stall, and the upper end of the protective tube is fixedly installed with a The first mounting seat; the expansion-type inner fishing spear includes a central rod, a fishing hook, an outer cylinder, a second mounting seat and a shrapnel; the lower end of the cable passes through the first through hole and is connected with the upper end of the cable marrow, and the lower end of the cable marrow It is fixedly connected with the second mounting seat; the expansion-type inner fishing spear that can slide out of the protection cylinder is located inside the protection cylinder. The invention has a reasonable and compact structure and is easy to use, and is especially suitable for oil and gas wells installed with variable-diameter tools such as downhole safety valves, which can significantly improve the fishing effect of steel wires, successfully realize the fishing of fish dropped by steel wires, simplify the fishing procedure, and increase the success rate of fishing .

Description

technical field [0001] The invention relates to the technical field of fishing tools in oil and gas drilling, and relates to a fishing tool for fish falling through a pipe string with a reduced diameter. Background technique [0002] Steel wire operations widely exist in the development process of oil and gas fields, such as well logging and testing operations, fishing operations, etc., most of which use steel wire operations. Due to the low tensile strength of the steel wire, once it gets stuck in the wellbore during oil and gas well operation, improper handling can easily cause the steel wire to break and cause fish to fall. Falling fish will affect the logging and testing operations in the later stage. If the fishing is not handled properly, it may even lead to the shutdown of oil and gas wells for workover and pipe inspection. Choosing a suitable wire overhauler has high application value in the actual production process. At present, there are mainly three types of wir...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a steel wire fish fishing device through a variable diameter pipe string, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of the existing hook fishing The outer diameter of the tool is limited, it is difficult to capture the steel wire attached to the well wall after the diameter is changed, it is easy to decouple after capture, and the success rate of fishing the steel wire is low

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