A mathematical model, fully coupling multiple porous media deformation and fluid flow, was established based on the elastic theory of porous media and fluid-solid coupling mechanism in tight oil reservoirs. The finite element method was used to determine the numerical solution and the accuracy of the model was verified. On this basis, the model was used to simulate productivity of multistage fractured horizontal wells in tight oil reservoirs. The results show that during the production of tight oil wells, the reservoir region close to artificial fractures deteriorated in physical properties significantly, e.g. the aperture and conductivity of artificial fractures dropped by 52.12% and 89.02% respectively. The simulations of 3000-day production of a horizontal well in tight oil reservoir showed that the predicted productivity by the uncoupled model had an error of 38.30% from that by the fully-coupled model. Apparently, ignoring the influence of fluid-solid interaction effect led to serious deviations of the productivity prediction results. The productivity of horizontal well in tight oil reservoir was most sensitive to the start-up pressure gradient, and second most sensitive to the opening of artificial fractures. Enhancing the initial conductivity of artificial fractures was helpful to improve the productivity of tight oil wells. The influence of conductivity, spacing, number and length of artificial fractures should be considered comprehensively in fracturing design. Increasing the number of artificial fractures unilaterally could not achieve the expected increase in production.

基于多孔介质弹性理论和致密油藏流固耦合机理，建立了多孔隙介质变形与流体流动完全耦合的数学模型。采用有限元法确定数值解，验证了模型的准确性。在此基础上，利用该模型模拟致密油藏多级压裂水平井产能。结果表明，在致密油井生产过程中，靠近人工裂缝的储集层物性明显劣化，人工裂缝孔径和导流能力分别下降52.12%和89.02%。致密油藏水平井 3000 天产量模拟结果表明，非耦合模型预测产能与全耦合模型的误差为 38.30%。显然，忽略流固相互作用效应的影响，导致产能预测结果出现严重偏差。致密油藏水平井产能对启动压力梯度最敏感，对人工裂缝张开敏感度次之。提高人工裂缝的初始导流能力有助于提高致密油井的产能。压裂设计应综合考虑导流能力、间距、人工裂缝条数、长度等因素的影响。