부산대학교 도서관

Core technology of production fluid control in intelligent completion accurately regulates rate of downhole flow control valve. Accurate monitoring of downhole flow control valve opening is crucial to realizing its intelligent closed-loop control. The absence of sliding sleeve position sensor in existing multistage hydraulic flow control valves in China leads to the inaccurate position of the sliding sleeve opening and imprecise control of production. A new hydraulic downhole flow control valve for intelligent completion that adopts innovative technologies is proposed in this study to develop a concentric structure linear position sensor, measure the position of the sliding sleeve accurately, integrate single-core cable power supply and signal transmission technology, and share single-core steel pipe cables with downhole electronic monitoring systems of intelligent completion in China. Sealing groove was added between valve holes on the inner wall of the flow trim to form a gap sealing structure with sliding sleeve and enhance the overall sealing of the tool. An elastic locking pawl structure is uniquely designed to lock the sliding sleeve. Field test results showed that the tool can achieve precise positioning of the opening of the downhole flow control valve in the target layer and the expected purpose.