Abstract
Aiming at the problems of insufficient driving force and low accuracy in the traditional pure electric and pure liquid layered water injection control system, we present a joint electronic and hydraulic control system for separate water injection. Firstly, the circuits of the control, measurement and communication modules of the separate layer water injection system are designed. Then, the time-sharing and constant-pressure water injection for different oil layers is realized by employing the solenoid valves, where the pressure and the temperature of each layer are used to analyze the tightness of downhole instruments. Moreover, through the injection pressure experiment, a time-pressure curve is established, and information such as pressure, temperature, and current are displayed in real time. The experimental results show that the system can realize the control of downhole stratification under the condition of good sealing performance.
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