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基于镜像反演及Green函数,建立了致密油藏体积压裂水平井产能评价非稳态半解析模型,模型考虑了生产过程中裂缝间的相互干扰,使用经典的Warren-Root双重介质模型刻画了体积改造区域内裂缝网络的延伸和展布以及流体在体积压裂改造区域内的渗流模式。通过实例拟合在验证模型实用性的基础上对影响产能的参数做了敏感性分析。研究结果表明:裂缝半长越大,早、中期产能越大,同时这种相关性还受裂缝半长与封闭边界的相对大小制约,裂缝半长占储层宽度比越大,对产能影响越明显;裂缝条数越多,产能越大;储容比越大,初期产量越高;窜流系数只对窜流发生段产能有影响;裂缝间距越大,后期产量越高,另外,合理优化裂缝半长和裂缝间距的关系对提高产能有很大意义。
Based on the image inversion and Green’s function, a semi-analytical model for productivity evaluation of volumetric fracturing in tight reservoirs was established. The model considered the mutual interference between fractures in the production process. The model was characterized by the classical Warren-Root dual-media model The extension and spread of fracture network in the area of volume alteration and the seepage mode of the fluid in the volume fracturing reformation area. Through the example fitting, the sensitivity analysis of the parameters influencing capacity was made on the basis of verifying the practicability of the model. The results show that the larger the half-length of the crack, the larger the production capacity in the early and mid-term. At the same time, this correlation is also controlled by the relative size of the half-length of the crack and the closed boundary. The larger the width ratio of the half- Obviously, the larger the number of cracks, the higher the capacity. The larger the storage-storage ratio, the higher the initial yield. The channeling coefficient only affects the production capacity of cross flow. The larger the crack spacing is, the higher the yield is. In addition, The relationship between crack half-length and crack spacing is of great significance to increase productivity.