Check valve for oil field high-pressure water injection well

Abstract

The invention provides a check valve for an oil field high-pressure water injection well. The check valve comprises an external cylinder, an internal valve and an end cap, wherein a water injection pipe is arranged on the side wall of the external cylinder; the bottom of the external cylinder is opened and provided with a water inlet; the internal valve is disposed in the external cylinder and in a slideable and sealing connection to the inner wall of the external cylinder; a water outlet is arranged on the side wall of the internal valve; the water outlet and the water injection pipe are correspondingly arranged; the upper part of the end cap is in a screwed connection with the inner wall of the external cylinder; the lower part of the end cap is in a slideable and sealing connection to the inner wall of the external cylinder; and the center of the base of the end cap is provided with a hook device connected with the top of the internal valve. The check valve is simply structured, easy to operate and can prolong service life and reduce maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of one-way valves, and relates to a one-way valve used for high-pressure water injection wells in oil fields. Background technique [0002] At present, in oil field production, water injection wells have widely adopted the measure of installing check valves at the wellheads in order to prevent the formation from regurgitating water and producing sand. As is known, the current check valves used in water injection wells are high-pressure horizontal check valves, and reverse closure is achieved in the valve body by spring or gravity. At the same time, due to corrosion, the long-term collision between the valve ball and the valve seat causes damage or the injected water contains various impurities and scales, which make the impurities and scales adhere to the check valve valve and the valve seat, resulting in the failure of the check valve. After being used for a period of time, it is damaged and closed tightly...

AI Technical Summary

Problems solved by technology

At the same time, due to corrosion, the long-term collision between the valve ball and the valve seat causes damage or the injected water contains various impurities and scales, which make the impurities and scales adhere to the check valve valve and the valve seat, resulting in the failure of the check valve. After being used for a period of time, it is damaged and closed tightly, and loses the reverse single-flow effect

When the water injection well is shut down for some reason, the formation water will reversely flow into the wellbore due to the formation pressure difference, and the formation water will carry a large amount of formation sand under the reaction force, forming the phenomenon of formation sand vomiting, and the water injection layer and water injection pipe string of the water injection well will be Buried by sand, the water injection well cannot be produced normally, and the water injection well must carry out operations such as sand washing, sand control, and inspection, resulting in huge operating expenses

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