Liquid flow control sliding sleeve

Abstract

The invention discloses a liquid flow control sliding sleeve, and belongs to the field of petroleum underground exploitation. The liquid flow control sliding sleeve comprises a central pipe, wherein the upper part of the central pipe is in sliding connection with an external pipeline through a sliding sleeve body, and a sealing piece is arranged in the connecting position of an annular pipeline opening and the central pipe; an oil outlet pipeline sleeves the interior of the central pipe; the central pipe is reset through a second reset spring, a central check valve is fixedly connected to the bottom of the central pipe, and a valve seat which is matched with the central check valve is arranged below the central check valve; the central check valve is reset through a first reset spring; and an anchoring device is arranged on one side of the lower part of the central pipe, one end of the anchoring device is fixedly connected to the inner wall of the external pipeline, and the anchoring device is located above the first reset spring. The liquid flow control sliding sleeve has the advantages of low valve opening pressure, large fluid channel, small fluid resistance, small sliding resistance, high sand prevention capacity, excellent sand resistance and wear resistance, small liquid leakage erosion risk, high overall reliability and the like.

Description

technical field [0001] The invention belongs to the field of oil well mining, in particular to a liquid flow control sliding sleeve. Background technique [0002] The reversing valve is a directional control valve with more than two flow forms and more than two oil ports; it is a valve that realizes communication, cut-off and reversing of hydraulic oil flow, as well as pressure unloading and sequential action control; There are two kinds of rotary valve type and slide valve type; according to the number of working positions where the valve core stays in the valve body, it is divided into two positions, three positions, etc.; according to the number of oil circuits connected to the valve body, it is divided into Two-way, three-way, four-way and six-way, etc.; there are manual, motorized, electric, hydraulic, electro-hydraulic and other types of operating spool movement. [0003] At present, in the field of oil well mining, submersible electric pump wells are widely used in o...

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of oil well exploitation, electric submersible pump wells are widely used in oil field production practice, but when complex well conditions or other objective factors cause electric When the pump unit stops running, impurities or sand particles in the pipe string will be deposited on the check valve under the action of gravity; when the amount of deposited sand accumulates to a certain extent, the check valve will be completely buried, making it difficult or even impossible to start the pump again. As a result, the oil well is shut down, causing workover operations and increasing operating costs

[0004]A lot of researches have been done on this problem in China, but the existing automatic reversing valves still have the following problems: 1. The valve directly controls the two working states of separation and closing , although the operating principle is very simple, but the phenomenon of erosion and liquid leakage is serious; 2. For fluid resistance, the existing reversing valve is greatly affected by the spring force and flow; 3. From the perspective of sealing, the existing The metal seal of the reversing valve is easy to scratch, and the rectangular seal is often used, which has a large sliding resistance; and the surface of the seal is polished, and the hardness is not enough, so it is easy to scratch and cause the seal to fail; 4. In the well of the self-spraying electric pump , the fluid will directly pass through the electric pump, which will not only increase the production flow resistance, but also erode and wear the electric pump, which will greatly reduce the service life of the electric pump; The phenomenon that causes the stuck pump

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