摘要
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。
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 mathematic model 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 solution has been obtained and converted into real space solution by means of the numerical inversion of Stehfest and the solution of the mathematic modelis obtained.Onthebasis of the varyingrelation 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 is of actual significance to develop deformed double porosity media reservoirs reasonably and to ensure the normal production of the gas wells or reservoir.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第2期115-120,15,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
双重变形介质
应力敏感
流量
动态特征
数学模型
deformed double porosity media
stress-sensitivity
flowing
dynamic Characteristics
mathematic model
