Analytical model of fluid pressure evolution in the reservoir for CO2 geological storage

WU Hai-qing; BAI Bing; LI Xiao-chun; LIU Ming-ze; HE Yuan-yuan

doi:10.16285/j.rsm.2016.1775

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Analytical model of fluid pressure evolution in the reservoir for CO2 geological storage

更新时间：2026-06-25

- Analytical model of fluid pressure evolution in the reservoir for CO2 geological storage
- Vol. 39, Issue 6, Pages: 2099-2105(2018)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北,武汉,430071
  2. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.1775
  CLC： TV139
- Online First：03 July 2018，
  
  Published：2018
- 稿件说明：
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WU Hai-qing, BAI Bing, LI Xiao-chun, et al. Analytical model of fluid pressure evolution in the reservoir for CO2 geological storage[J]. 2018, 39(6): 2099-2105.
DOI：

WU Hai-qing, BAI Bing, LI Xiao-chun, et al. Analytical model of fluid pressure evolution in the reservoir for CO2 geological storage[J]. 2018, 39(6): 2099-2105. DOI： 10.16285/j.rsm.2016.1775.

摘要

为使解析模型可以更加科学准确地描述储层中多相流体的迁移机制与压力演化规律，提高解析计算与分析的精度。首先将储层中的流场划分为3个区域，然后根据渗流体积守恒方程反演储层中两相流体混合渗流区的各相流体饱和度，进而将总流度直接引入到达西公式中得到了一个适用于两相流的广义达西公式，据此推导出了一个更为精确的表征储层流体压力演化规律的解析模型。最后，通过案例分析，将该解析模型的计算结果与既有文献的显式积分解及TOUGH2/ECO2N的数值解进行对比，验证了该模型的可靠性及相比于既有文献的显式积分解在计算精度方面的优越性。此外，计算结果也表明，该解析模型虽然是在稳态流的假定条件下得到的，但对于实际储层流体压力演化的全过程均具有很强的表征能力，这主要归因于该模型可科学准确地确定饱和度，因此，可以在工程中推广应用。

Abstract

This study aims to investigate the mechanism of multi-phase flow migration and the evolution rule of fluid pressure in the reservoir more scientifically and precisely

and to improve the accuracy of analytical calculation and analysis. The flow field was divided into three regions firstly and then inverted the saturation of each phase fluid in the mixed fluid flow region of two-phase fluid based on the conservation equation of seepage volume in the flow field. Subsequently

a generalised Darcy’s formula suited for the two-phase flow was obtained by directly introducing the total mobility into Darcy’s formula. Thus

a more accurate analytical model was derived for characterising the fluid pressure evolution in the reservoir. At last

this analytical model was applied to calculate a CO2 injection example

and the obtained results were compared with the explicit integral solution in existing references and the simulated results of TOUGH2/ECO2N. The compared results indicated that the reliability of the analytical model was verified and the superiority was reflected in the aspect of calculation accuracy. In addition

the calculation results showed that the full process of the actual fluid pressure evolution in the reservoir could be described well by the analytical model of this work

though it was obtained under the assumption of steady flow. The main reason is contributed to that the determination method of saturation in this model is more scientific and accurate. Hence

this model can be applied in practical engineering.

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