Year
Month
(Peer-Reviewed) Time-dependent borehole stability in hard-brittle shale
Chuan-Liang Yan 闫传梁 ¹ ², Lei-Feng Dong 董磊峰 ², Kai Zhao 赵凯 ³. Yuan-Fang Cheng 程远方 ¹ ², Xiao-Rong Li 李晓蓉 ⁴, Jin-Gen Deng 邓金根 ⁴, Zhen-Qi Li ², Yong Chen 陈勇 ²
¹ Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, 266580, Shandong, China
中国 山东 青岛 中国石油大学(华东) 非常规油气开发教育部重点实验室
² School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
中国 青岛 中国石油大学(华东)石油工程学院
³ College of Petroleum Engineering, Xi’an Shiyou University, Xi'an, 710065, Shaanxi, China
中国 西安 西安石油大学石油工程学院
⁴ State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
中国 北京 中国石油大学(北京)油气资源与探测国家重点实验室
Petroleum Science, 2021-12-16
Abstract

Rock damage appears in brittle shale even prior to peak stress (i.e., before failure) due to the occurrence of microcracks in these rocks. In this work, a coupled hydromechanical model was built by incorporating the mechanical and fluid seepage induced stresses around a wellbore during drilling. The borehole instability mechanism of hard-brittle shale was studied. The results show that even if a well were simply drilled into a hard-brittle shale formation, the formation around the borehole can be subjected to rock damage.

The maximum failure ratio of the formation around the borehole increases with drilling time. A lower drilling fluid density corresponds to a faster increase in the failure ratio of the borehole with time and a shorter period of borehole collapse. When the initial drilling fluid density is too low, serious rock damage occurs in the formation around the borehole. Even though a high-density drilling fluid is used after drilling, long-term borehole stability is difficult to maintain. While drilling in hard-brittle shale, drilling fluid with a proper density should be used rather than increasing the density of the drilling fluid only after borehole collapse occurs, which is more favorable for maintaining long-term borehole stability.
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Time-dependent borehole stability in hard-brittle shale_2
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