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首页> 外文期刊>Journal of natural gas science and engineering >A novel semi-analytical model for finite-conductivity multiple fractured horizontal wells in shale gas reservoirs
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A novel semi-analytical model for finite-conductivity multiple fractured horizontal wells in shale gas reservoirs

机译：页岩气藏有限电导率多裂缝水平井新型半解析模型

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The use of multiple fractured horizontal wells (MFHWs) is considered an effective means for developing shale gas reservoirs, and a variety of models have recently been introduced to study the pressure behaviors of MFHWs in shale gas reservoirs. However, most of the existing models are based on some ideal assumptions that may not always be true in practice. This paper presents a novel semi-analytical model for finite-conductivity MFHWs in shale gas reservoirs with consideration of more actual conditions, such as finite-conductivity fractures, different fracture lengths, different fracture intervals, various angles between the fractures and the horizontal well, fracture asymmetry about the horizontal well, and partially penetrating fractures. Laplace transform, source function, numerical discrete method, and Gaussian elimination method are applied to solve the present model. The solution is presented in Laplace space so that the effects of the wellbore storage and skin can be easily incorporated by Duhamel's principle. Type curves of the pressure responses are plotted, possible flow regimes are identified, and a detailed analysis of the pressure characteristics is presented. The present model is much closer to the conditions of an actual reservoir, and thus it can be applied to an accurate interpretation of the pressure data of an MFHW in a shale gas reservoir. (C) 2015 Elsevier B.V. All rights reserved.
机译：人们认为，使用多口压裂水平井（MFHWs）是开发页岩气储层的有效手段，最近引入了多种模型来研究MFHW在页岩气储层中的压力行为。但是，大多数现有模型都是基于一些理想的假设，这些假设在实践中可能并不总是正确的。本文提出了一种新颖的半页岩气储集层中的MFHW的半解析模型，该模型考虑了更多的实际条件，例如有限度裂缝，不同的裂缝长度，不同的裂缝间隔，裂缝与水平井之间的不同角度，水平井的裂缝不对称以及部分穿透的裂缝。应用拉普拉斯变换，源函数，数值离散法和高斯消元法求解该模型。该解决方案是在拉普拉斯空间中提出的，因此，根据杜哈默（Duhamel）的原理，可以轻松合并井筒存储和皮肤的影响。绘制了压力响应的类型曲线，确定了可能的流动状态，并对压力特性进行了详细分析。本模型更接近于实际储层的条件，因此可以用于页岩气储层中MFHW压力数据的准确解释。 （C）2015 Elsevier B.V.保留所有权利。

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