Code communication method for water injection wells based on transient flow waves in tubular strings

Abstract

Aiming at the current problems of heavy duty and long periods of measurement and adjustment for water injection wells, a new code communication method based on transient flow waves in tubular strings was studied. Then, the generation and response characteristics of transient flow wave control signals were explored. The coding and decoding methods of transient flow wave were established, simulated by PIPENET software, and verified by the well tests. The results shows that water injection does not need to be stopped during data transmission by using the wave code method. Transient flow wave encoding can be achieved by operating the valves at the wellhead and downhole. Furthermore, the format of data frame is defined and the data frame can be extended according to the actual situations. In the simulation test, the communication between the wellhead and the downhole water regulator is realized and the optimal control is achieved. The moving average method is more suitable for signal filtering processing. Therefore, the method has the advantages of wireless signal transmission and light duty of testing and regulation. The code communication method for transient flow waves is beneficial to reducing water loss and improving water injection efficiency.