Cnpc Chuanqing Drilling Engineering Company Limited

Ccdc Petroleum Drilling & Production Technology Co Ltd

Yong Li

Lei Li

Xiaofeng Yang

Weicheng Li

Liexiang Han

Ming Feng

Shiming Dong

Zuo Chen

Sheng Yu

Kunpeng Yao

Xiaoping Fu

Jianlin Yao

Zhijun Lyu

Bin Liu

Gang Zhou

Wencai Chen

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

Yong Li