双重变形介质储层气井流量动态特征研究

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。

STUDY ON THE FLOWING PERFORMANCE OF GAS WELLS IN DUAL-POROSITY DE-FORMABLE FRACTAL RESERVOIRS

In the process of developing the deformed double porosity media reservoirs, the rock stress-sensitivity will apparently effect the performance of development. In this paper, the deformed double porosity mathematicmodel is established and the permeability stress-sensitivity is presented on the basis of considering double porosity media and deformable performance of rock. Through Laplace transformation, the Laplace space analytic solutionhas been obtained and converted into real space solution by means of the numerical inversion of Stehfest and the solution of the mathematic model is obtained. On the basis of the varying relation between the dimensionless rate and dimensionless time, the influence of the storativity ratio, the interporosity flow parameter, the dimensionless stresssensitivity and skin coefficient on gas well flux dynamic characteristics has been analyzed. The research result isof actual significance to develop deformed double porosity media reservoirs reasonably and to ensure the normal production of the gas wells or reservoir.