Oil-well pump pump-passing well washing device

Abstract

The invention provides an oil-well pump pump-passing well washing device. The oil-well pump pump-passing well washing device comprises a valve body assembly and a shell assembly, wherein the valve body assembly comprises a valve seat, a valve plate, a connecting pin and a torsional spring, the valve pate is connected with the valve seat through the connecting pin and torsional spring, and the valve plate can rotate around the connecting pin. The shell assembly comprises a cylindrical shell body and an adapting piece, the two ends of the shell body can be connected with an oil pipe, the shell body and the valve seat are fixed through the adapting piece, an opening which can contain the valve plate is formed in the side wall of the shell body, the valve plate is in a round shape, and the diameter of the valve plate is larger than or equal to the diameter of the cross section of the shell body. When crude oil enters the oil pipe from downhole, the valve plate is pressed to the opening ofthe inner wall of the shell body by crude oil pressure, and the crude oil can be prevented from leaking from the opening. When annulus well washing is carried out by injecting liquid outside the shellbody, the valve plate is pressed by the liquid pressure to intersect with the side wall of the shell body and stop the liquid from flowing to the downhole, the channel of the oil pipe and a reservoiris closed, the wall washing liquid cannot enter a leakage reservoir, and the pump pump-passing well washing operation can be carried out in case of reservoir leakage.

Description

Technical field [0001] The invention relates to an oil and gas field development engineering technology, in particular to a well-washing device for an oil pump through pump. Background technique [0002] In the process of oil exploitation, due to the influence of many factors, the formation sand in the reservoir often enters the wellbore and circulates to the surface with the tubing. During this process, part of the formation sand, due to its large particle size, is stuck in the pump, which will affect the efficiency and life of the pump, and in severe cases, it will also cause the pump to fail. At present, there are generally three ways to solve this problem in actual production: [0003] The first method, downhole sand control, is to use screens or other tools and techniques to block formation sand from the wellbore. However, no matter what sand control technology and tools are used, the blocked sand particles have a certain range and a critical particle size, and formation san...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a well flushing device for an oil well pump, which is used to solve oil well wellheads or oil well pumps that are prone to clogging (the temperature in the upper part of the wellbore is low, and oil viscosity, wax formation or sand plugging are prone to occur), plus reservoir leakage, Then the flushing fluid pumped from the oil casing annulus will leak from the reservoir, the wellbore circulation cannot be established, and the sand stuck in the pump cannot be removed.

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