考虑变形影响的致密砂岩油藏非线性渗流特征

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Abstract The process of water flooding met the law of non-Darcy flow and existed threshold pressure gradient in tight sandstone reservoirs. Porous medium would get deformed，and the permeability would decrease. The nanometer pore characteristics of tight sandstone through scanning electron microscope(SEM) experiment were researched. Based on the distribution of rock particles，a theory model which characterized stress sensitivity caused by medium deformation was established and medium deformation coefficient was derived. The comparison analysis of results between the theory model and experiment is performed. Moreover，a seepage mathematical model was established which took the deformation of tight sandstone into consideration. The coupling influences of the threshold pressure gradient and medium deformation on the oil-water two-phase nonlinear percolation feature are studied. The result shows that the flow resistance and formation pressure drawdown loss increase under the coupling effects of threshold pressure gradient and medium deformation. Moreover，with the increase of production duration，amplitude of pressure drawdown loss would increase.

Key words： rock mechanics medium deformation tight sandstone reservoir nanometer pores threshold pressure gradient medium deformation coefficient

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3187

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