China National Petroleum Corporation

Cnpc Chuanqing Drilling Engineering Company Limited

Gui Tang

Lei Li

Chongjun Huang

Lichun Jia

Jing Bai

Jichuan Zhang

Dengyun Lu

Liexiang Han

Dejun Zhang

Chong Liao

A method for remotely shutting down a downhole unit of a rotary steering system from ground includes steps of: a: calculating a pressure difference Pbetween a front end and a rear end of the drill water hole; b: calculating an extension loss ΔP; c: calculating a pressure Pat the riser after turning on the downlink device; d: calculating an opening area Sof the throttle valve of the downlink device; and e: adjusting the throttle valve to a calculated opening degree; automatically targeting the function block that needs to be cut off according to a flow change detected downhole, and shutting down the downhole unit. The method can realize self-protection and continuous operation of the entire rotary steering system, reduce frequency of inspection that needs to pull back the drill when the rotary steering system is abnormal, improve drilling efficiency, and reduce costs.

Method for remotely shutting down downhole unit of rotary steering system from ground

Growing community of inventors

Sichuan, China

Gui Tang