地质力学
磁导率
多物理
岩石物理学
相对渗透率
多孔性
饱和(图论)
天然气
流体力学
石油工程
多孔介质
天然气田
井口
地质学
储层模拟
岩土工程
机械
热力学
物理
化学
有限元法
生物化学
组合数学
膜
有机化学
数学
作者
Weijun Shen,Tianran Ma,Xizhe Li,Baojiang Sun,Yong Hu,Jianchun Xu
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2022-04-01
卷期号:34 (4)
被引量:53
摘要
Efficiently and accurately understanding the fluid flow behavior in ultra-deep natural gas reservoirs is very challenging due to the complex geological environment and the intricate gas properties at high pressure. In this study, a fully coupled fluid flow and geomechanical model was developed to simulate complex production phenomena in ultra-deep natural gas reservoirs. Stress-dependent porosity and permeability models were applied, and then the governing equations of the model were incorporated into COMSOL Multiphysics. Furthermore, the model was verified by the reservoir depletion from the Keshen gas field in China, and the effects of reservoir properties and geomechanics on gas production were discussed. The results showed that the reservoir pressure and water saturation exhibited a significant funnel-shaped decline during the reservoir depletion. The higher relative permeability of the gas phase results in more methane gas production, thereby reducing the average pore pressure and gas saturation near the wellhead. When considering geomechanical effects, the production behavior significantly changes. The predictive value of gas production was higher when the reservoir rock deformation was ignored. The gas production exhibited strong positive correlations with reservoir porosity, fracture permeability, elastic modulus, and Poisson's ratio. Larger porosity, elastic modulus, and Poisson's ratio resulted in smaller deformation, while a smaller fracture permeability leads to larger deformation in ultra-deep natural gas reservoirs.
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