低渗透油藏CO2混相驱过程中考虑对流扩散的流固耦合模型研究

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摘要为研究低渗透油藏中对流扩散和流固耦合对CO2混相驱油的影响，推导低渗透油藏CO2混相驱过程中多相多组分渗流场、对流扩散场和应变场三场全耦合控制方程，并给出求解方法。模型考虑对流扩散、混相和岩石骨架的应力–应变对整个渗流过程的影响，并对边界条件进行约束。应用建立的考虑对流扩散的流固耦合模型进行实例分析，结果表明：所建模型综合考虑对流扩散与流固耦合现象对渗流的影响，体现出模型与计算方法的实用性，并提高CO2混相驱的模拟精度，本模型计算结果与常规数值模拟结果具有一定的可比性。同时，通过界面张力、产能、混相区域等参数定量描述对流扩散现象对CO2混相驱的影响。

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	李南
	程林松

关键词 ：岩石力学, 对流扩散, CO2混相驱, 流固耦合, 数值模拟

Abstract：In order to study the influence of convective diffusion and fluid-solid coupling on CO2 miscible flooding in the low permeability reservoirs，the coupling control equations of three fields which are multi-phase and multi-component seepage field，convective diffusion field and strain field are deduced；then the solution method is given. This model considers emphatically the impact of convective diffusion，miscible phases and stress and strain of rock skeleton on the whole flow process and constrains the boundary conditions. The example analysis is carried out by applying the fluid-solid coupling equations which are established by considering convective diffusion. The study results show that the established model comprehensively considers the influence of convective diffusion and fluid-solid coupling on seepage flow，which reflects the availabilities of the model and calculation method. The model improves the simulation precision of CO2 miscible flooding. The calculation results of this model and the conventional numerical simulation results are found to have certain comparability. Meanwhile，based on the calculation results，the influence of convective diffusion on CO2 miscible flooding is described quantitatively in the model in terms of interfacial tension，productivity，miscible area and so on.

Key words： rock mechanics convective diffusion CO2 miscible flooding fluid-solid coupling numerical simulation

引用本文:

李南，程林松. 低渗透油藏CO2混相驱过程中考虑对流扩散的流固耦合模型研究[J]. 岩石力学与工程学报, 2012, 31(S1): 3055-3060.
LI Nan，CHENG Linsong. STUDY OF FLUID-SOLID COUPLING MODEL CONSIDERING CONVECTIVE DIFFUSION OF CO2 MISCIBLE FLOODING IN LOW PERMEABILITY RESERVOIR. , 2012, 31(S1): 3055-3060.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/3055

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