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Energies 2017, 10(7), 996; doi:10.3390/en10070996

Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

College of Engineering, Peking University, Beijing 100871, China
Tarim Oil Company, PetroChina, Korla 841000, Xinjiang, China
Department of Energy Resources Engineering, Stanford University, Stanford, CA 94305, USA
Author to whom correspondence should be addressed.
Received: 17 June 2017 / Revised: 3 July 2017 / Accepted: 12 July 2017 / Published: 14 July 2017
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Unconventional shale gas production is often characterized by a short period of high production followed by a rapid decline in the production rate. Given the high costs of hydraulic fracturing and horizontal drilling, it is critical to identify the mechanisms behind the production loss. The existing shale gas production models often assume constant matrix permeability. However, laboratory observations show that matrix permeability can decrease significantly with increasing effective stress, which highlights the necessity of considering the stress-dependent properties of shale matrix in production analysis. Moreover, the compaction of pore space will also increase the matrix permeability by enhancing the gas-slippage effect. In this paper, a matrix permeability model which couples the effect of pore volume compaction and non-Darcy slip flow is derived. Numerical simulations are conducted to understand the role of matrix permeability evolution during production. Changes of fractures’ permeability and contact area during depletion process are also taken into account. The results indicate that the loss of fracture permeability has a greater impact at the early stage of the depletion process, while matrix permeability evolution is more important for the long-term production. View Full-Text
Keywords: shale gas production; gas-slippage effect; stress-dependent matrix and fracture properties shale gas production; gas-slippage effect; stress-dependent matrix and fracture properties

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Tang, H.; Di, Y.; Zhang, Y.; Li, H. Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production. Energies 2017, 10, 996.

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