Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2023, Vol. 45 ›› Issue (4): 1-18.DOI: 10.11885/j.issn.1674-5086.2021.04.05.01

• SPECIALIST FORUM •     Next Articles

Development Status of High-efficiency Rock-breaking and Speed-increasing Technologies for Deep Shale Gas Horizontal Wells

ZHU Xiaohua1,2, LI Rui1,2, LIU Weiji1,2, LI Zhilin3, LU Dengyun3   

  1. 1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. MOE Key Laboratory of Oil and Gas Equipment, Chengdu, Sichuan 610500, China;
    3. Chuanqing Drilling Engineering Company Limited, CNPC, Chengdu, Sichuan 610051, China
  • Online:2023-08-10 Published:2023-07-18

Abstract: At present, China has basically formed the economic exploitation of shallow shale gas engineering technology system, and is moving towards deep layer (more than 3 500 m) exploitation. Deep shale gas has great development potential with rich reserve. But the problems of slow drilling speed and high cost caused by high hardness, high plasticity and high abrasiveness of deep rock are very prominent. Therefore, the efficient rock breaking methods and influencing factors in deep shale gas drilling are introduced. We analyze and summarize the efficient transmission technology of reducing friction and torsion in deep shale gas horizontal wells to improve bit breaking power; and we analyze and summarize new technologies of bit and tooth with strong attacking power and longer service, technology of rock breaking parameter enhancement by using speed-raising tool to assist bit and speed-raising tool-bit parameter matching technology that is suitable for deep shale gas, and briefly describe several new non-mechanical and efficient rock breaking methods, aiming to providing a reference for future economic and efficient exploration and development of deep shale gas.

Key words: deep shale gas, ROP rising, horizontal well, drag and torque, parameter enhancement, efficient rock breaking

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