Cnpc Chuanqing Drilling Engineering Company Limited

China National Petroleum Corporation

Ccdc Petroleum Drilling & Production Technology Co Ltd

Liexiang Han

Lei Li

Jing Bai

Jichuan Zhang

Chongjun Huang

Lichun Jia

Dengyun Lu

Xiaofeng Yang

Weicheng Li

Dejun Zhang

Shiming Dong

Kunpeng Yao

Chong Liao

Gui Tang

Sheng Yu

Bin Liu

Jianlin Yao

Xiaoping Fu

Zhijun Lyu

Gang Zhou

Wencai Chen

Zuo Chen

Ming Feng

Yong Li

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

A dual-speed and dual-core enhanced drilling equipment which has an outer cylinder, a downhole power device, a large cutting head and a small cutting head. Specifically, the large cutting head has a first centerline, a through hole arranged along the first centerline and a first diameter. The outer cylinder, which is sleeved outside the downhole power device, is connected to the upper drill string with the large cutting head to enable rotation among the large cutting head, downhole power device and upper drill string. The downhole power device has a power generation section capable of generating power, and a rotation output section which connects to, and provides independent power for the small cutting head, so that the small cutting head revolves around the first centerline under the driving of the upper drill string while rotating under the driving of the downhole power device.

Dual-speed dual&#x2014;core enhanced drilling equipment

Growing community of inventors

Guanghan, China

Liexiang Han