With the rapid development of hydraulic fracturing technology, shale gas has become a significant natural gas resource in China. At present, SRV (stimulated reservoir volume) fracturing technology is widely used to exploit shale gas reservoirs. To evaluate the shale gas reserves and design a development plan, a simple and rapid method is needed to predict the production and performance of the multistage fractured horizontal wells with stimulated reservoir volume in shale gas reservoirs. Network fractures with different lengths and widths are not symmetrical to the horizontal well. To account for the complexity of the fracture system and desorption characteristics of shale gas, a semianalytical multiregion seepage model has been established to analyze the performance of multiple fractured horizontal wells. In this paper, a triple‐porosity dual‐permeability model is developed for simulating the flow mechanism of shale gas. Different lengths and widths of network fractures, different fracture intervals, and asymmetry distribution are considered in this model. By employing the principle of Poisson's superposition and Bessel transformation, the fundamental solution of instantaneous point source function has been derived to calculate the pressure response of each hydraulic fracture. Then, the mathematical model for unsteady performance evaluation in multiple fractured horizontal wells has been obtained to simultaneously solve the pressure response of every hydraulic fracture. The sensitivity analysis in terms of the lengths and widths of network fractures, fracture intervals, and the asymmetry distribution of a complex fracture system is presented. The research results show that the SRV morphology will exert a great influence on the performance of multiple fractured horizontal wells.

中文翻译：

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页岩气藏多口压裂水平井性能评价

随着水力压裂技术的飞速发展，页岩气已成为我国重要的天然气资源。目前，SRV（增产储层）压裂技术被广泛用于开发页岩气储层。为了评估页岩气储量并制定开发计划，需要一种简单而快速的方法来预测页岩气储层中储量增加的多级压裂水平井的产量和性能。不同长度和宽度的网络裂缝与水平井不对称。考虑到裂缝系统的复杂性和页岩气的解吸特征，建立了半解析多区域渗流模型，以分析多口压裂水平井的性能。在本文中，建立了三孔双渗透模型，用于模拟页岩气的流动机理。该模型考虑了网络裂缝的长度和宽度，裂缝间隔和不对称分布的不同。利用泊松叠加原理和贝塞尔变换原理，导出了瞬时点源函数的基本解来计算各个水力压裂的压力响应。然后，获得了用于多口压裂水平井非稳态性能评估的数学模型，以同时解决每条水力压裂的压力响应。根据网络裂缝的长度和宽度，裂缝间隔和复杂裂缝系统的不对称分布，进行了敏感性分析。