China National Petroleum Corporation

Cnpc Chuanqing Drilling Engineering Company Limited

Dejun Zhang

Lei Li

Jichuan Zhang

Lichun Jia

Chongjun Huang

Jing Bai

Dengyun Lu

Yi Xie

Liexiang Han

Gui Tang

Chong Liao

Bin Mao

Kexu Chen

Zhilin Li

A jet flow adjustment method for rotary steerable downhole release includes steps of: defining a diversion ratio p of a jet nozzle by a ground control system; and sending the diversion ratio p of the jet nozzle to a control unit of a downhole rotary steerable system; and determining an opening areas of the jet nozzle by the control unit according to the diversion ratio p of the jet nozzle and an equivalent channel area S of a drilling tool; controlling an adjustable bypass valve by the control unit of the downhole rotary steerable system according to the calculated opening area s of the jet nozzle, so as to control an overlapping area between sector holes of a rotor end and a stator end, thereby opening the jet nozzle for release. The present invention has simple control and strong release ability.

Jet flow adjustment method for rotary steerable downhole release

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

Dejun Zhang