Research on decoding technology for surface-well fluid pulse communication in oil and gas wells

Abstract

Rotary-guided drilling technology is a cutting-edge automated and efficient drilling technology developed in the late twentieth century to meet the urgent needs of oil and gas resources exploration and development. In this paper, an in-depth study is made on the down-transmission communication technology in rotary-guided drilling, and an oil and gas well surface-down-hole fluid pulse communication device is designed. In this system, cable-free transmission is used to break the existing domestic and foreign rotary-guided drilling information transmission technology, and the drilling fluid, which is indispensable in drilling, is used as the transmission medium without changing the existing drilling process or breaking the rotary-guided drilling technology. Secondly, a unique coding method is used to code the commonly used guiding force and tool face angle according to the actual operation in the drilling process to form 36 guiding points, which greatly reduces the cost. This design completes the downhole decoder design and the experimental results meet the expectations. The design of the work is of great significance for the realization of an automatic closed-loop guided drilling control system.