Tubular pump fixed valve break off overshot

Abstract

The invention relates to a fisher for a broken-off fixed valve of a tubing pump. The fisher comprises an outer fishing cylinder and a ball shifting cylinder, wherein the upper part of the outer fishing cylinder is connected with a fishing tube pillar, the lower part is connected with the ball shifting cylinder, the ball shifting cylinder can extend into space between a coupling and a sleeve, a guiding oblique plane and a limiting baffle plate are arranged at the bottom end of the ball shifting cylinder, a vertical first straight groove provided with an opening in the bottom end is formed between the guiding oblique plane and the limiting baffle plate, the highest end of the guiding oblique plane intersects with the first straight groove, the top end of the first straight groove is connected with an upward tilted groove, the highest point of the tilted groove is connected with a vertical downward second straight groove, a reversing channel is formed by the first straight groove, the tilted groove and the second straight groove, a valve ball can move in the reversing channel, and spring shifting pieces are arranged below the bottommost end of the second straight groove and on the inner wall of the ball shifting cylinder. The fisher is simple in structure, convenient to operate and reusable, grinding and milling processes are omitted, the service life of the sleeve is prolonged, the cost is low, and the construction can be completed only by one-time tripping in of the fishing tube pillar, so that time is saved.

Description

technical field [0001] The invention relates to a fishing operation tool for oil field workover, in particular to a fishing device for breaking off a fixed valve of a tubular pump. Background technique [0002] The most commonly used method of artificial lifting in oilfields is to use rod-type pumps for production. When the fixed valve of the rod-type pump breaks off, the fixed valve and the production string below the fixed valve will fall into the bottom of the casing. It needs to be salvaged before normal production can resume. Since the outer diameter of the fixed valve of the general tubular pump is φ73mm and the inner diameter is φ30mm, the outer diameter of the lower coupling is φ89mm, the outer diameter of the fixed ball is φ38mm, the inner diameter of the 51 / 2in casing is φ124mm, and the shape of the top of the fish at the bottom of the casing is a ball. Above the collar, between the stationary valve and the bushing. [0003] This type of fish top shape cannot be ...

AI Technical Summary

Problems solved by technology

[0003] This type of fish top shape cannot be salvaged by the internal fishing tool or the external fishing tool at present. The milling tool can only be lowered to grind the ball and the fixed valve, and then the internal fishing tool or the external fishing tool is used to catch the remaining falling objects.

Since the material of the ball and fixed valve is wear-resistant hard alloy steel, the shape is smooth and the friction coefficient is small, and the milling is difficult. It takes more than 5 days of continuous milling to complete the construction, and after a long period of milling During the process, the casing will inevitably be damaged. The larger the inclination angle of the milling position, the more serious the damage to the casing will be, which will shorten the service life of the casing.

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