Semi-Analytical Reservoir Modeling of Non-Linear Gas Diffusion with Gas Desorption Applied to the Horn River Basin Shale Gas Play, British Columbia (Canada)

Wanju Yuan (), Zhuoheng Chen, Gang Zhao, Chang Su and Bing Kong
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Wanju Yuan: Geological Survey of Canada, Calgary Division, 3303 33rd Street, NW, Calgary, AB T2L 2A7, Canada
Zhuoheng Chen: Geological Survey of Canada, Calgary Division, 3303 33rd Street, NW, Calgary, AB T2L 2A7, Canada
Gang Zhao: Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Pkwy, Regina, SK S4S 0A2, Canada
Chang Su: China National Offshore Ocean Corporation Limited-Shanghai, Shanghai 200000, China
Bing Kong: Geological Survey of Canada, Calgary Division, 3303 33rd Street, NW, Calgary, AB T2L 2A7, Canada

Energies, 2024, vol. 17, issue 3, 1-23

Abstract: Adsorbed gas may account for a significant part of the gas resources in shale gas and coalbed methane plays. Understanding gas sorption behaviors and integrating gas desorption into analytical reservoir modeling and an associated transient performance analysis are important for evaluating a system’s gas desorption ability and further analyzing its CO 2 injectability, utilization, and storage capacity. However, gas desorption, along with other pressure-dominated gas properties, increases a system’s non-linearity in theoretical studies. Few studies on analytical modeling have integrated the gas desorption feature into a non-linear system and validated the model’s accuracy. In this study, the desorbed gas due to pressure decay was treated as an additional source/sink term in the source-and-sink function methods. This method was combined with the integral image method in a semi-analytical manner to determine the amount of gas desorption. Fundamental reservoir and gas properties from the Horn River Basin shale gas play were chosen to evaluate the methodology and the performance of the associated production well. The results were compared with the commercial fine-gridding numerical simulation software, and good matches were achieved. The results showed that the desorbed gas released from rock will supply free-gas flow when the pressure significantly decreases due to gas production. The production wellbore pressure can be maintained at a higher level, and the production rate was higher than in cases where gas desorption was not considered, depending on the operating conditions.

Keywords: semi-analytical methodology; shale gas desorption; non-linear gas diffusion; reservoir modeling; pressure and rate transient analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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