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在开发双重变形介质油气藏过程中,储层岩石应力敏感性会明显影响油气藏的开发效果。在考虑储层双重介质和变形特性的基础上,引入渗透率应力敏感系数,建立了双重变形介质气藏不稳定渗流模型(包括:无限大边界气藏、圆形封闭边界气藏、圆形定压边界气藏),通过Laplace变换,得到了模型的Laplace空间解析解,利用Stehfest数值反演得到实空间的解。根据实空间中无因次产量与无因次时间的变化关系曲线,分析了储容比、窜流系数、无因次应力敏感系数、表皮系数对气井流量动态特征的影响。研究结果对科学合理开发双重变形介质气藏、保证气井和气藏正常生产等都具有重要的理论和现实意义。
During the development of double deformation medium reservoirs, reservoir rock stress sensitivity will obviously affect the development effect of reservoirs. Based on the dual media and deformation characteristics of the reservoir, the permeability stress sensitivity coefficient is introduced, and the unsteady seepage model of dual deformation media reservoir (including infinite boundary gas reservoir, circular closed boundary gas reservoir, circular set Pressure boundary gas reservoir), the Laplace transform of the model is obtained by Laplace transform, and the solution of real space is obtained by Stehfest numerical inversion. According to the curves of dimensionless yield and dimensionless time in real space, the influence of the ratio of storage to storage, channeling flow coefficient, dimensionless stress sensitivity coefficient and skin factor on gas flow characteristics are analyzed. The results of the study have important theoretical and practical significance for the scientific and rational development of double deformation gas reservoirs and for the normal production of gas wells and gas reservoirs.