Sealable tail tube unsealing and salvaging tool

Abstract

The invention relates to a sealable tail tube unsealing and salvaging tool. The sealable tail tube unsealing and salvaging tool comprises an upper joint, an outer sleeve, an unsealing pin, a spring shaft base, a spring sleeve and a sealing tail tube, wherein the upper joint is connected with the upper end of the outer sleeve through a threaded structure, and is sealed by an O-shaped sealing ring;the outer sleeve is fixedly connected with the spring shaft base through the unsealing pin and is sealed by an O-shaped sealing ring; the lower end of the outer sleeve is connected with the spring sleeve through a threaded structure; a spring and a sectioning salvaging claw are arranged between the spring sleeve and the spring shaft base; the spring sleeve is connected with the upper end of the sectioning salvaging claw through inner and outer shoulders; the lower end of the sectioning salvaging claw sleeves the outer circle of the upper end of the sealing tail tube; the upper end of the sealing tail tube is connected with the lower end of the spring shaft base through a threaded structure; and two O-shaped sealing rings are arranged at the outer circle of the lower end of the sealing tailtube. The sealable tail tube unsealing and salvaging tool can seal a central tube, so that the inner part of the oil tube can bear pressure, also has a return function, can avoid salvaging operation,is reasonable in structural design, is simple and convenient in operation, is safe and reliable, and is high in salvaging success rate.

Description

technical field [0001] The invention relates to a fishing matching tool for downhole operations in the field of petroleum mechanical oil recovery, in particular to a fishing tool for unsealing a sealable tail pipe. Background technique [0002] In most blocks of the oilfield, there are many layers of oil layers, the distribution of oil, gas and water, and the corresponding relationship between oil and water wells are complex. After a period of development, due to reasons such as channeling and injected water, they have entered a high water-cut development stage. In order to reduce the water content of the produced crude oil, To achieve stable and high production in the oilfield, corresponding multi-stage packer strings are used for water plugging and production. The fishing anchor is composed of upper joint, jacket, split fishing claw, etc. It is found in the field application that when the lifting force of the pipe is large, the split fishing claw will shrink radially, the ...

AI Technical Summary

Problems solved by technology

[0002] In most blocks of the oilfield, there are many layers of oil layers, the distribution of oil, gas and water, and the corresponding relationship between oil and water wells are complex. After a period of development, due to reasons such as channeling and injected water, they have entered a high water-cut development stage. In order to reduce the water content of the produced crude oil, To achieve stable and high production in the oilfield, corresponding multi-stage packer strings are used for water plugging and production. The fishing anchor is composed of upper joint, jacket, split fishing claw, etc. It is found in the field application that when the lifting force of the pipe is large, the split fishing claw will shrink radially, the outer diameter will become smaller and it will come out of the top of the fish, and the fishing will fail. , when it is necessary to give up fishing for some reason, the split fishing claws cannot withdraw from the top of the fish. In addition, the central tube is not sealed, so it is impossible to press the tubing. Therefore, in order to improve the success rate of fishing operations, it is urgent to study a firmly stuck The fish top seals the central tube at the same time, and can withdraw from the fish top when necessary, giving up fishing tools for fishing operations

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