Application of high-speed mud pulse transmission technology in LWD

Abstract:

The Drilog? LWD developed by COSL consists of MWD, DSM and ACPR, and have already been put into operation for hundreds of times. In order to improve ROP and incorporation of more high-end imaging instruments, COSL has independently developed the HSVP? high-speed mud pulse telemetry system which includes the downhole instrument and the surface decoding system. Water circulation testing and field trial demonstrate that it can realize real-time decoding at 12bps. In the exploration and development of oil and gas fields, the HSVP? can improve the transmission efficiency from downhole to surface; thus, helping to control the drilling trajectory real time, and contributing to the single well productivity and recovery. This paper introduces the use of the high-speed mud pulse tool over the 81/2in section of a Shanxi shale gas well. According to the data from the MWD system, analysis is made of the results from trajectory control, dynamic trajectory measurement and logging while drilling quality. The results show that the HSVP? system has high drilling efficiency, fast transmission rate and timely and accurate orientation. It has been proven that the logging quality of the system is excellent during the drilling process. The field use of the tool has also accumulated experience for the further use of the system.