Dual-speed dual—core enhanced drilling equipment

Assignee

• Cnpc Chuanqing Drilling Engineering Company Limited

Inventors

• Liexiang Han (12 patents)
• Zuo Chen (2 patents)
• Bin LIU (157 patents)
• Xiaofeng YANG (1 patents)
• Sheng-Kang Yu (50 patents)
• Jianlin Yao (1 patents)
• Gang Zhou (88 patents)
• Ming Feng (2 patents)
• Shiming Dong (1 patents)
• Kunpeng Yao (1 patents)
• Weicheng Li (12 patents)
• Lei Li (411 patents)
• Xiaoping Fu (17 patents)
• Zhijun Lyu (3 patents)
• Wencai Chen (1 patents)
• Yong Li (160 patents)

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