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research-article

Performance Evaluation of Gas Production with Consideration of Dynamic Capillary Pressure in Tight Sandstone Reservoirs

[+] Author and Article Information
Leng Tian

Petroleum Engineering College, China University of Petroleum, Beijing, China; Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK, Canada, S4S 0A2
tianleng2008@126.com

Bo Feng

Petroleum Engineering College, China University of Petroleum, Beijing, China
fb3212@qq.com

Sixu Zheng

Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK, Canada, S4S 0A2
zheng23s@uregina.ca

Daihong Gu

Petroleum Engineering College, China University of Petroleum, Beijing, China
gudaihong@cup.edu.cn

Xiaoxing Ren

Petroleum Engineering College, China University of Petroleum, Beijing, China
532933659@qq.com

Daoyong (Tony) Yang

Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK, Canada, S4S 0A2
tony.yang@uregina.ca

1Corresponding author.

ASME doi:10.1115/1.4041410 History: Received May 25, 2018; Revised August 24, 2018

Abstract

In this paper, a pragmatic and consistent framework has been developed and validated to accurately predict reservoir performance in tight sandstone reservoirs by coupling the dynamic capillary pressure with gas production models. Theoretically, the concept of pseudo-mobile water saturation which is defined as the water saturation between irreducible water saturation and cutoff water saturation is proposed to couple dynamic capillary pressure and stress-induced permeability to form an equation matrix that is solved by using the IMPES method. Compared with the conventional methods, the newly developed model predicts a lower cumulative gas production but a higher reservoir pressure and a higher flowing bottomhole pressure at the end of the stable period. Physically, a higher gas production rate induces a greater dynamic capillary pressure, while both cutoff water saturation and stress-induced permeability impose a similar impact on the dynamic capillary pressure, though the corresponding degrees are varied. Due to the dynamic capillary pressure, pseudo-mobile water saturation controlled by the displacement pressure drop also affects the gas production. The higher the gas production rate is, the greater the effect of dynamic capillary pressure on the cumulative gas production, formation pressure, and flowing bottomhole pressure will be. By taking the dynamic capillary pressure into account, it can be more accurate to predict the performance of a gas reservoir and the length of stable production period, allowing for making more reasonable development schemes and thus improving the gas recovery in a tight sandstone reservoir.

Copyright (c) 2018 by ASME
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