Rock Mechanics and Rock Engineering

, Volume 50, Issue 10, pp 2795–2804 | Cite as

Experimental Study on Longmaxi Shale Breaking Mechanism with Micro-PDC Bit

  • Teng Wang
  • Xiaohua Xiao
  • Haiyan Zhu
  • Jingying Zhao
  • Yuheng Li
  • Ming Lu
Original Paper
  • 231 Downloads

Abstract

China has abundant shale gas resource, but its geological conditions are complicated. This work sought to find the shale breaking mechanism with the polycrystalline diamond compact (PDC) bit when drilling the shale that is rich in stratification. Therefore, a laboratory-scale drilling device based on a drilling machine is developed. The influences of Longmaxi shale stratification on drilling parameters in the drilling process with micro-PDC bit are investigated. Six groups of drilling experiments with six inclination angles (β = 0°, 15°, 30°, 45°, 60° and 90°), total thirty-six groups, are carried out. The weight on bit reaches the maximum value at β = 30° and reaches the minimum value at β = 0°. The biggest torque value is at β = 30°, and the smaller torque values are at β = 15°, β = 45° and β = 60°. When the inclination angle is between 30° and 60°, the shale fragmentation volume is larger. The inclination angle β = 0° is beneficial, and β = 15° and β = 60° are detrimental to controlling the drilling direction in the Longmaxi shale gas formation.

Keywords

Laboratory research Longmaxi shale Joint inclination Breaking mechanism Drilling parameter 

Notes

Acknowledgements

This work was performed as part of a shale project supported by international cooperation project of Sichuan province under Grant No. 2015HH0020. This work was supported by the search Foundation of National Natural Science Foundation of China (No. 51604232), and the 973 Program of China under Grant No. 2014CB239205.

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Copyright information

© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  • Teng Wang
    • 1
  • Xiaohua Xiao
    • 1
  • Haiyan Zhu
    • 2
  • Jingying Zhao
    • 4
  • Yuheng Li
    • 1
  • Ming Lu
    • 3
  1. 1.School of Mechatronic EngineeringSouthwest Petroleum UniversityChengdu SichuanChina
  2. 2.State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu SichuanChina
  3. 3.School of Petroleum and Natural Gas Engineering, Southwest Petroleum UniversityChengdu SichuanChina
  4. 4.Unconventional Oil and Gas DepartmentSouthwest Oil and Gas Field of CNPCChengdu SichuanChina

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