Safety rope socket and fuse calculation method for same

Abstract

The invention relates to a safety rope socket and a fuse calculation method for the same in order to overcome the defects that if the prior downhole steel wire operation gets stuck, break points of steel wire and the rope socket are indefinite, the falling accidents happen after the steel wire is broken, and the difficulty in handling the accidents is increased. The safety rope socket comprises ataper sleeve (2) and a taper rod (3). The sectional areas of the upper and lower end parts of a fuse (5) are larger than that of a middle part. One end of the fuse (5) is fixedly connected with the lower end of the taper sleeve (2), while the other end is fixedly connected with an external cylinder (1). The fuse (5) and the lower end of the taper sleeve (2) are connected through a pin I (4); and the fuse (5) and the external cylinder (1) are fixedly connected with each other through a pin II (6). The lower end part of the external cylinder (1) is connected with threads; and a fishing neck (7)is arranged on the external surface of the external cylinder (1). The safety rope socket has the advantages that: the safety rope socket has a simple structure and convenient operation, correctly determines the rupture tensile force value of a safety device, effectively avoids the occurrence of fishing accidents of broken steel wires, and ensures the normal process of the production operation.

Description

Technical field [0001] The invention relates to a downhole steel wire operation tool used in the oil exploitation process, in particular to a safety rope cap connected with a fixed steel wire and a fuse calculation method for the safety rope cap. Background technique [0002] In the process of oil exploitation, the steel wire is used for operation, and one end of the steel wire is fixedly connected with the rope cap, and the rope cap is connected with other downhole operation tools. When the downhole tool is stuck and the sticking force is greater than the breaking force of the steel wire, if the steel wire is continued to be lifted, the steel wire will break, and the steel wire and the tools connected thereto will fall into the well, resulting in a falling well accident. At present, the rope caps used in the field mainly include tapered rope caps and spring type rope caps. The Chinese utility model patent "Quick Connecting Rope Cap" (CN2651418Y) published on October 27, 20...

AI Technical Summary

Problems solved by technology

The connection strength of ordinary spring-type rope caps is generally 85% to 100% of the breaking force of the steel wire, but it cannot accurately control the breaking value. It is mainly used for steel wire operations below 2.4mm

[0003] The common features of the above two rope caps are simple structure and reliable connection, which can be applied to the connection of steel wires and wire ropes of different sizes. The steel wire was broken on the ground, causing the steel wire to fall into the well, which not only lost the steel wire, but also increased the difficulty of subsequent accident handling operations

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