Dynamic Effect of Capillary Pressure in Tight Gas Reservoir
Dynamic Effect of Capillary Pressure in Tight Gas Reservoir
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DOI：
10.2174/1874834101407010071
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发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
Ai-lin Jia;Z. Lv
中科院分区：
文献类型：
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作者：
Ai-lin Jia;Z. Lv
多孔介质中双流体流动的标准理论假定毛细管压力处于平衡状态。数值模拟器通常假设当流体饱和度发生变化时，平衡毛细管压力-饱和度条件保持不变。但最近的理论表明，毛管压力可能不仅是饱和度的函数，而且是速率变化的函数，这就是所谓的动态效应。为了研究动态毛管压力对致密气藏流体流动的影响，综述了动态毛管压力的标准理论以及目前新的孔隙尺度和达西尺度理论方法。提出了一种模拟致密气藏生产的数学和数值方案，其中包括动态毛细管压力关系，这使得人们能够识别以前未报道的流动情景。数值方案还修改了Gray和Has- Sanizadeh入渗方程，以考虑取决于流速的毛细管压力。这一研究对查明致密气藏的渗流规律及后续开发工作具有重要意义。
Standard theories for two-fluid flow in porous media assume capillary pressure to be in equilibrium. Numerical simulators often assume that equilibrium capillary pressure-saturation conditions are maintained as changes in fluid satu- ration are taking place. But recent theories indicate that capillary pressure is perhaps not only a function of saturation but also rate change, which is known as the dynamic effect. In order to investigate effects of the dynamic capillary pressure on fluid flow in tight gas reservoirs, standard theory and present novel pore-scale and Darcy-scale theoretical approaches that account for a dynamic capillary pressure were reviewed in this paper. A dynamic capillary pressure relationship was included in the mathematical and numerical schemes were proposed to simulate tight gas reservoir production, which al- lows one to identify previously unreported flow scenarios. The numerical schemes were also to modify the Gray and Has- sanizadeh equation for infiltration to account for a capillary pressure that depends on the flow velocity. This study is of great benefit to finding out the flow law of tight gas reservoir and the subsequent work of exploitation.