Abstract
Wireless control downhole throttle is designed to control the opening of downhole throttle remotely by ground pressure wave signal to regulate downhole production in a wireless and intelligent manner. The throttle’s production regulation capability and the noise immunity of the signal receiver are the key factors affecting the reliability of the throttle operation. Based on computational fluid dynamics (CFD) theory, the flow field of downhole throttle is simulated numerically to study the flow resistance characteristics of wireless control downhole throttle and the stability of flow field at signal receiver. Finally, the field test proves that the tool achieves the design capacity of production regulation and can accurately receive signals to regulate downhole production in a wireless and intelligent manner. The research content of this paper provides theoretical and experimental basis for the further improvement and optimization of the wireless control downhole throttle’s structure and has certain guiding significance for the field use of the throttle, achieving the purpose of downhole wireless intelligent production adjustment.
Highlights
At present, most of the downhole chokes used in gas wells are purely mechanical
E wireless control throttle is the core of the wireless control downhole throttling technology, and determining its effective operation performance is of critical importance [12,13,14,15,16,17,18,19,20,21,22,23]. ere are two key design points that affect the effective operation performance: noise immunity of the downhole signal receiver directly determines the reliability and accuracy of the remote wireless control of the entire system; the overall flow capacity of the throttle directly determines whether the gas can move smoothly
The opening of the throttle valve is controlled by the flap angle. e electric sealing cylinder is used to protect the internal electronic components and form an annular flow passage with the external air guiding cylinder. e head end is mounted with the downhole signal receiver for receiving the ground pressure wave signal
Summary
Analyze the effective working conditions when the throttle valve takes a leading role and if the outer diameter of the electric sealing cylinder is not up to the critical flow cylinder diameter. The critical effective opening increases with the increasing production before regulation, and decreases with the increase of the outer diameter of the electric sealing cylinder, that is, reduction of the flow area of the annular flow passage.
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