Downhole flow control valve

Abstract

The invention discloses an underground flow control valve, which comprises an upper valve body, a first-stage liquid cylinder inner cylinder, a first-stage piston, a second-stage piston, a lower valve body and a throttle valve sleeve; the first-stage liquid cylinder inner cylinder It is arranged inside the upper valve body; the first-stage piston is arranged in the upper valve body, and the first step end surface of the inner cylinder of the first-stage hydraulic cylinder and its outer peripheral wall, the upper valve body and the first-stage piston are surrounded by the first oil Cavity, the outer peripheral wall of the inner cylinder of the first-stage hydraulic cylinder and its second step end face, the inner peripheral wall of the first-stage piston and its first step end face form a second oil chamber, and the second-stage piston is arranged in the upper valve body , the second step end face of the first stage piston and its outer peripheral wall, the upper valve body and the second stage piston form a third oil chamber, the third step end face of the first stage piston and its outer peripheral wall, the second stage piston The fourth oil chamber is enclosed between the first step end surface of the first step and its inner peripheral wall; the lower valve body is connected to the other end of the upper valve body, and the throttle valve sleeve is fixedly arranged in the lower valve body.

Description

technical field [0001] The invention relates to a downhole flow control valve, in particular to a downhole flow control valve device applied to a multi-opening intelligent well completion system in oil drilling and completion and oil and gas exploitation. Background technique [0002] The intelligent completion technology mainly realizes the remote control of the downhole flow control valve through hydraulic power, and can complete the control of the production flow rate of the downhole oil and gas layers on the ground, and realize the arbitrary switching of multi-production modes such as multi-layer co-production and inter-layer optimization. . Using intelligent completion technology, the flow rate of downhole production layers can be controlled. If you only need to open or close the production layer, you can use two downhole flow control valves to achieve it; if you want to control the flow rate of a single production layer more accurately, The flow control valve of two o...

AI Technical Summary

Problems solved by technology

Using intelligent completion technology, the flow rate of downhole production layers can be controlled. If you only need to open or close the production layer, you can use two downhole flow control valves to achieve it; if you want to control the flow rate of a single production layer more accurately, A flow control valve with two openings is obviously impossible to realize

Patent CN201410618870.5 uses J-shaped grooves to achieve different openings of fracturing sleeves through rotation. If hydraulic control is used, repeated positive and negative pressure is required to realize multi-stage switch fracturing of downhole fracturing sleeves; CN201720642612.X adopts Electronic control to realize the opening and closing of the sliding sleeve requires the participation of electrical components. In the underground high temperature and high pressure environment, the durability is not easy to meet

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