致密砂岩气藏储层物性差,需要采用水平井配合多级水力压裂技术进行开发,为此,对低渗透气藏多级压裂水平井稳态产能模型进行了研究。首先,由渗流力学基本原理,建立单条裂缝水平井等效井径模型;然后,运用叠加原理,建立了耦合水平井段管流...致密砂岩气藏储层物性差,需要采用水平井配合多级水力压裂技术进行开发,为此,对低渗透气藏多级压裂水平井稳态产能模型进行了研究。首先,由渗流力学基本原理,建立单条裂缝水平井等效井径模型;然后,运用叠加原理,建立了耦合水平井段管流动态的多级压裂水平井稳态产能模型,在Visual Studio 2008C#编程环境下,对模型进行了求解,获得了多级压裂水平井产量及压力分布。在此基础上,对多级压裂水平井稳态产能的相关影响因素进行了分析,认为缝长是影响低渗透气藏产能的主要因素,而裂缝导流能力对其影响不大。通过矿场实例,计算得到西部某气藏压裂水平井单井产能为11.357×104m3/d,与实测产能误差为15.7%,验证了计算结果的准确性。该井在压裂施工中应尽可能提高缝长,以获得更好的增产效果。展开更多
A fundamental solution for homogeneous reservoir in infinite space is derived by using the point source function with the consideration of the threshold pressure gradient. The fundamental solution of the continuous po...A fundamental solution for homogeneous reservoir in infinite space is derived by using the point source function with the consideration of the threshold pressure gradient. The fundamental solution of the continuous point source function is then derived based on the Green function. Various boundary conditions of the reservoirs are considered for this case and the corresponding solutions are obtained through the mirror image reflection and the principle of superimposition. The line source solution is obtained by integration. Subsequently, the horizontal-well bottom hole pressure response function for a non-linear gas flow in the homogeneous gas reservoir is obtained, and the response curve of the dimensionless bottom hole pressure and the derivative for a horizontal well in the homogeneous gas reservoir are obtained. In the end, the sensitivities of the relevant parameters are analyzed, The well test model presented in this paper can be used as the basis of the horizontal well test analysis for tight gas reservoirs.展开更多
文摘致密砂岩气藏储层物性差,需要采用水平井配合多级水力压裂技术进行开发,为此,对低渗透气藏多级压裂水平井稳态产能模型进行了研究。首先,由渗流力学基本原理,建立单条裂缝水平井等效井径模型;然后,运用叠加原理,建立了耦合水平井段管流动态的多级压裂水平井稳态产能模型,在Visual Studio 2008C#编程环境下,对模型进行了求解,获得了多级压裂水平井产量及压力分布。在此基础上,对多级压裂水平井稳态产能的相关影响因素进行了分析,认为缝长是影响低渗透气藏产能的主要因素,而裂缝导流能力对其影响不大。通过矿场实例,计算得到西部某气藏压裂水平井单井产能为11.357×104m3/d,与实测产能误差为15.7%,验证了计算结果的准确性。该井在压裂施工中应尽可能提高缝长,以获得更好的增产效果。
基金the National Science Fund for Distinguished Young Scholars of China (Grant No. 51125019)the National Key Basic Research and Development Program of China (973 Program, Grant No. 2011CB201005)the Research Foundation of the State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University (Grant No. PLN-ZL201201)
文摘A fundamental solution for homogeneous reservoir in infinite space is derived by using the point source function with the consideration of the threshold pressure gradient. The fundamental solution of the continuous point source function is then derived based on the Green function. Various boundary conditions of the reservoirs are considered for this case and the corresponding solutions are obtained through the mirror image reflection and the principle of superimposition. The line source solution is obtained by integration. Subsequently, the horizontal-well bottom hole pressure response function for a non-linear gas flow in the homogeneous gas reservoir is obtained, and the response curve of the dimensionless bottom hole pressure and the derivative for a horizontal well in the homogeneous gas reservoir are obtained. In the end, the sensitivities of the relevant parameters are analyzed, The well test model presented in this paper can be used as the basis of the horizontal well test analysis for tight gas reservoirs.
