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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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

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	LI Nan
	CHENG Linsong

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LI Nan,CHENG Linsong. STUDY OF FLUID-SOLID COUPLING MODEL CONSIDERING CONVECTIVE DIFFUSION OF CO2 MISCIBLE FLOODING IN LOW PERMEABILITY RESERVOIR[J]. , 2012, 31(S1): 3055-3060.

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

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