Self-expanding automatic oil drain device

Abstract

The invention belongs to the field of downhole tools for oil field production, and particularly relates to a self-expanding automatic oil drain device. The self-expanding automatic oil drain device comprises an upper joint, a central pipe, a lower joint, an outer central pipe, a shear pin, an upper outer sleeve, an elastic damping ring assembly, a clamp spring carrier, a clamp spring and a lower outer sleeve; the upper end of the central pipe is connected with the upper joint in a threaded mode, and oil drain holes are formed in the side wall, under the positions of the threaded connection, ofthe central pipe and the side wall, corresponding to the threaded connecting positions, of the upper joint; the outer central pipe sleeves the outer part of the central pipe and a ring cavity for liquid passing is reserved between the central pipe and the outer central pipe, and the ring cavity is called a liquid passing passage; the upper end of the outer central pipe sleeves the upper joint andthe oil drain holes are blocked; and the outer central pipe is connected with the upper joint through the shear pin, and the upper outer sleeve sleeves the outer part of the outer central pipe, and aring cavity is reserved between the upper outer sleeve and the outer central pipe. According to the self-expanding automatic oil drain device, the problems of tedious processes of pressing, repeatedly lifting and releasing a pipe string, throwing weights and the like of a conventional oil drainer are solved; and the automatic oil drain can be realized with the linkage of the pipe string, and theoperation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of downhole tools for oil production in oil fields, in particular to a self-expanding automatic oil draining device. Background technique [0002] With the in-depth development of the country's emission reduction, energy saving and environmental protection, the performance of some domestic oil drilling tools is falling behind the requirements of the times. Among them, the oil drainer used for oil draining in the process of pulling out the string is the most representative. . At present, there are generally the following problems in various conventional oil drainers: 1. The start-up process of oil drainage is relatively complicated, and operations such as pressurization by a pressurized vehicle, collision with heavy objects, and repeated lifting and release of pipe strings are required, which artificially causes objects to fall down the well. 2. Most of the oil drainage starting parts are made of carbon steel. When us...

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Problems solved by technology

[0003] In order to solve the problems in the background technology, the present invention provides a self-expanding automatic oil draining device. The oil draining process of the present invention does not require pressurization, throwing heavy objects, repeated lifting and releasing, eliminating tedious procedures, and greatly The operation efficiency is greatly improved, and at the same time, it has the backwashing function to meet the needs of oilfield backwashing operations and fluid measurement

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