关键词:  , 旋转导向钻井；钻井液脉冲；通讯协议；控制系统；软件系统集成 ,  

Abstract:  Rotary steering is the key technique in the steering control of the bottom hole assembly for gas and oil drilling at present, which is widely used in long horizontal-section wells, extended reach wells, multilateral wells and other complex wells. Drilling fluid pulse is the main communication mode of rotary steering drilling. Transmission code and its synchronization are demanding due to the transmission characteristics of low speed, propagation delay and high bit error rate. Furthermore, an effective ground monitor system is required for on-site engineers to master the conditions of guide bit and the control of trajectory. Focusing on these requirements and the specific circumstances in the rotary steerable drilling engineering, a communication protocol is designed between upper and lower computers considering short instruction transmission and the accurate identification, and downward instruction coding scheme is shown. A corresponding communication and control system is developed, which can accomplish transmission of control instructions and real-time display of drilling parameters, the software system integration of rotary steerable drilling equipment is solved. This system provides with actual control interfaces and ground testing interfaces, which meets the requirements in practical engineering.

Key words:  , rotary steerable drilling, drilling fluid pulse, communication protocol, control system, software system integration