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Experimental and numerical simulation on the influence of anisotropic fracture network deformation to shale gas percolation

  • ICCESEN 2017
  • Published:
Arabian Journal of Geosciences Aims and scope Submit manuscript

Abstract

Shale gas reservoirs usually have extremely low porosity and permeability. By massive fracturing, shale gas industry development has well-developed fracture network, which generally has the characteristics of anisotropy and pressure sensitivity. Present studies on fracture network fail to consider both anisotropy and pressure sensitivity. The percolation experiments on pressure sensitivity, gas slippage effect, and water damage mechanism are carried out by a new physical experiment method with similar materials. It is not only more convenient but also more secure to use similar materials to observe fracture deformation and the flow law of fluid under low pressure. Then a new percolation mathematical model considering both anisotropy and pressure sensitivity is established. And a numerical solution of mathematical model with 19-point fully implicit finite difference is conducted. Finally, a discussion is presented of the results of numerical simulation and experiment test. The most significant finding is that (a) the gas slip effect has a greater influence on gas apparent permeability of fracture network media than pressure-sensitivity effect does; (b) the gas apparent permeability of fracture network media was affected greatly by fracturing fluid due to the formation damage and relative permeability; (c) the permeability of fracture network increases with initial formation pressure increases, decreases with well bottom pressure decreases; and (d) the anisotropic fracture network deformation will significantly decrease permeability, and the cumulative gas production is positively correlated with angle between main facture and horizontal well. The study will can play a significant role in the simulation of shale gas production.

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Funding

This paper was financially supported by the National Natural Science Foundation Project of China (No. 51374222), National Major Project of China (No. 2016ZX05032005-002), and National Key Basic Research & Development Program of China (No. 2015CB2509005).

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Authors and Affiliations

  1. Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing, China

    Xiaolong Mao & Yuetian Liu

  2. Petro China Research Institute of Petroleum Exploration & Development, Beijing, China

    Xiaolong Mao, Wenlong Guan & Feng Yueli

Authors
  1. Xiaolong Mao
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  2. Yuetian Liu
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  3. Wenlong Guan
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  4. Feng Yueli
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Corresponding author

Correspondence to Yuetian Liu.

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This article is part of the Topical Collection on Geo-Resources-Earth-Environmental Sciences

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Mao, X., Liu, Y., Guan, W. et al. Experimental and numerical simulation on the influence of anisotropic fracture network deformation to shale gas percolation. Arab J Geosci 11, 615 (2018). https://doi.org/10.1007/s12517-018-3973-9

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  • DOI: https://doi.org/10.1007/s12517-018-3973-9

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