Laboratory studies of shale fracturing behaviors with rock-drilling fluid interactions

被引：4
|
作者：
Kang Y. [1 ]
Chen Q. [1 ,2 ]
You L. [1 ]
Lin C. [1 ]
Cheng Q. [3 ]
机构：
[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu
[2] School of Geoscience and Technology, Southwest Petroleum University, Chengdu
[3] North China Oil and Gas Branch Company of SINOPEC, Zhengzhou
来源：
| 1600年 / University of Petroleum, China卷 / 40期
关键词：
Chemical erosion; Drilling fluid; Fracture development; Rock fracturing behaviors; Shale;
D O I：
10.3969/j.issn.1673-5005.2016.04.010
中图分类号：
学科分类号：
摘要：
Drilling in shale formations has been a challenge due to wellbore instability problems. Loss of drilling fluid into the formation can cause complex interactions of rock-fluid and change the cracking behavior of shale during chemical erosion with reactive clays. In this study, high temperature immersion testing was conducted to investigate the interactions of shale rock samples with various drilling fluids in order to reveal the mechanisms of rock failure, in which the fracture development and microstructure changes of shale rocks during drilling fluid immersion were analyzed, and the fracturing behaviors and its controlling factors were investigated. The results show that strong chemical interactions between the shale samples and drilling fluids in terms of fracture development have been observed. These interactions can enhance the propagation of fracture, and the fracturing behavior is time and chemical dependent. The fracturing of shale can be significantly reduced by increasing the plugging capability and adjusting the pH value of drilling fluids. The shale fracturing induced by chemical erosion of drilling fluids can be attributed to hydration reactions and alkali effects. Optimized oil-based fluid and well designed water-based fluid are essential for wellbore stability. This study can provide valuable insights into the nature of the wellbore instability in shale drilling. © 2016, Periodical Office of China University of Petroleum. All right reserved.
引用
收藏
页码：81 / 89
页数：8
相关论文
共 23 条
  • [1] Wei B., Wang Z., Guo B., The therory of shale instability and its research progress, Petroleum & Production Technology, 30, 3, pp. 16-20, (2007)
  • [2] Qiu Z., Xu J., Lu K., Et al., A multi-variate cooperation principle for well-bore stabilization, Acta Petrolei Sinica, 28, 2, pp. 117-119, (2007)
  • [3] Deng H., Meng Y., Study on stability of brittle shale hydration, Petroleum Drilling Techniques, 31, 1, pp. 33-36, (2003)
  • [4] Feng X., Masahiro M., Rock fracturing behaviors under chemical corrosion-part I: experimental study, Chinese Journal of Rock Mechanics and Engineering, 19, 4, pp. 403-407, (2000)
  • [5] Tang L., Wang S., Testing study on effects of chemical action of aqueous solution on crack propagation in rocks, Chinese Journal of Rock Mechanics and Engineering, 21, 3, pp. 314-319, (2002)
  • [6] Kang Y., Huang F., You L., Et al., Simulation and application of shale fracture width immersed in drilling fluid, Oil Drilling & Production Technology, 36, 4, pp. 41-46, (2014)
  • [7] Wang H., Zhang D., Zhang D., Et al., Drilling technology on shale gas in Weiyuan structure, Drilling & Production Technology, 35, 2, pp. 9-11, (2012)
  • [8] He T., Li M., Yang L., Et al., Application of oil-based drilling fluid in shale gas horizontal well in district of Weiyuan, Drilling Fluid & Completion Fluid, 29, 3, pp. 1-6, (2012)
  • [9] Wang Z., Difficulty and application principle of the drilling fluid technology of horizontal wells for shale gas, Sino-Global Energy, 17, 4, pp. 43-47, (2012)
  • [10] Fritz B., Jarrett M., Potassium silicate treated water-based fluid: an effective barrier to instability in the fayetteville shale, (2012)
123