A new productivity model based on gas-water seepage resistance coefficient for tight sandstone reservoirs

被引：0
|
作者：
Zhang J. [1 ,2 ,3 ]
Gao S. [1 ,2 ,3 ]
Xiong W. [1 ,2 ,3 ]
Ye L. [1 ,2 ,3 ]
Liu H. [2 ,3 ]
Zhu W. [2 ,3 ]
Yang Y. [1 ,2 ,3 ]
Niu W. [1 ,2 ,3 ]
机构：
[1] University of Chinese Academy of Sciences, Beijing
[2] Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Hebei, Langfang
[3] PetroChina Research Institute of Petroleum Exploration and Development, Beijing
来源：
Natural Gas Industry | 2023年 / 43卷 / 01期
关键词：
Mathematical model; Permeability; Pore pressure; Productivity equation; Seepage resistance coefficient; Tight sandstone gas;
D O I：
10.3787/j.issn.1000-0976.2023.01.017
中图分类号：
学科分类号：
摘要：
The gas-water two-phase seepage law of tight sandstone reservoirs is complex, the experiment is difficult, and the current two-phase seepage equation has some limitations. In this paper, the gas-water two-phase seepage simulation under different pressure conditions is realized by modifying the procedure on the basis of the conventional gas-water relative permeability test. Then, two mathematical models of seepage resistance coefficient are established by means of mathematical analysis from the perspectives of coefficient fitting and parameter reduction, and their correctness and applicability are verified by means of numerical simulation. Finally, a new productivity equation is derived. And the following research results are obtained. First, the seepage resistance coefficient of the same rock sample under a high pore pressure is larger than that under an atmospheric pressure, no matter in the process of water flooding gas or gas flooding water, which indicates that high pore pressure has a certain influence on gas-water two-phase seepage. Second, with the increase of pore pressure, its effect on gas-water two-phase seepage resistance reduces. After a certain stage, the gas-water two-phase seepage capacity does not change obviously with the increase of pore pressure. Third, there is a good logarithmic relationship between seepage resistance coefficient and pore pressure, and an inverse relationship between seepage resistance coefficient and permeability in the process of pure water flooding, water flooding gas or gas flooding water. Fourth, two mathematical models of seepage resistance coefficient are established from the perspectives of coefficient fitting and parameter reduction. Then a new productivity equation is derived. The calculated IPR curve of gas well is basically consistent with the calculation result of the traditional equation. In conclusion, the seepage resistance coefficient eliminates the influence of sample geometrical size and displacement velocity in the experiment, and the derived new productivity calculation model of tight sandstone gas reservoir is reliable and accurate. The research results are of great significance to the efficient and rational development of tight sandstone gas. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
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页码：177 / 187
页数：10
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