Abstract
Understanding the effect of fluid exposure on organic-rich shale mechanical properties is crucial in design of working fluids used in shale reservoir drilling and hydraulic fracturing. A series of triaxial compression tests and friction coefficient measurements were conducted on dry and fluid exposure specimen of three typical organic-rich shales in China. Fluid-type and time-dependent variation of mechanical properties were significantly observed between dry and fluid exposure specimen. These variations are attributed to the specific fabric feature of organic-rich shale and different fluid–shale interaction mechanisms, which is predominantly hydration for water-based fluid and friction reduction for oil-based fluid. Fluid exposure effect will increase the risk of wellbore instability through increasing pore pressure and decreasing shale strength. It also influences the propagation and orientation of hydraulic fractures, strengthens proppant embedment, and induces fines migration and colloids agglomeration/precipitation in hydraulic fracturing. Improve sealing performance, apply clay stabilizer and surfactant, manage pH value, and increase drilling rate are mainly effective methods to prevent or mitigate adverse effect of fluid exposure on shale oil/gas well drilling and production performance. These fluid effect control strategies have been successfully applied in the shale reservoir drilling in Sichuan Basin and Ordos Basin.
Copyright 2017, Shaanxi Petroleum Society.
This paper was prepared for presentation at the 2017 International Field Exploration and Development Conference in Chengdu, China, 21–22 September 2017.
This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Science and Technology Major Project of China (No. 2016ZX05061), the Natural Science Foundation of China (No. 51674209), and the Youth Science and Technology Innovation Team Project of Sichuan Province of China.
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Lin, C., Kang, Y.L., You, L.J., Yan, X.P., Chen, Q. (2019). Effect of Fluid Exposure on Mechanical Properties of Organic-Rich Shale and Field Applications. In: Qu, Z., Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2017. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7560-5_158
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DOI: https://doi.org/10.1007/978-981-10-7560-5_158
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