Self-expanding type automatic oil drainage device

Abstract

The invention belongs to the field of downhole tools for oil extraction in an oil field, and particularly relates to a self-expanding type automatic oil drainage device. The self-expanding type automatic oil drainage device comprises an upper joint, a center pipe, a lower joint, an outer center pipe, shear nails, an upper jacket, an elastic damping ring assembly, a clamping spring carrier, a clamping spring and a lower jacket; the upper end of the center pipe is in threaded connection with the upper joint; oil drainage holes are formed in the side wall of the center pipe below the threaded connection part and the side wall of the upper joint corresponding to the threaded connection part; the outer center pipe sleeves the center pipe; an annular cavity for liquid passing is reserved betweenthe outer center pipe and the center pipe, and is called a liquid passing channel; the upper end of the outer center pipe sleeves the upper joint and blocks the oil drainage holes; the outer center pipe is connected with the upper joint through the shear nails; the upper outer sleeve sleeves the outer center pipe; and an annular cavity is reserved between the upper outer sleeve and the outer center pipe. Complicated procedures such as pressing, repeatedly lifting and releasing a pipe column, throwing a heavy object and the like required by the conventional oil drainage device are solved; andthe self-expanding type automatic oil drainage device can achieve the effect of automatic oil drainage along with the linkage of the pipe column, so that the operation 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...

AI Technical Summary

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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