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首页> 外文期刊>Journal of natural gas science and engineering >Sensitivity analysis of geometry for multi-stage fractured horizontal wells with consideration of finite-conductivity fractures in shale gas reservoirs
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Sensitivity analysis of geometry for multi-stage fractured horizontal wells with consideration of finite-conductivity fractures in shale gas reservoirs

机译：页岩气藏多导裂缝水平井几何有限度裂缝敏感性分析

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摘要

A new analytical solution of pressure and rate transient analysis is proposed for MFHW with finite-conductivity transverse hydraulic fractures in shale gas reservoirs. Meanwhile, desorption, adsorption, viscous flow, stress sensitivity of natural fractures, skin damage and wellbore storage are simultaneously considered as well in this paper. Laplace transformation, line source function, perturbation method, and superposition principle are employed to solve this new model. The pressure and rate transient responses are inverted into real time space with stehfest numerical inversion algorithm. Based on this new solution, the transient pressure distribution of MFHW with multiple finite-conductivity transverse hydraulic fractures was obtained, type curves are plotted, and different flow regimes in shale gas reservoirs are identified, the effects of relevant parameters are analyzed as well. The innovation and essence of this paper is combining transient gas flow in finite-conductivity hydraulic fractures, the geometry of hydraulic fractures and dual-porosity character of shale gas reservoirs. Compared with some existing models for shale gas reservoirs, this new model is more comprehensive and can provide a relative practical analysis of the relevant parameters. Besides, the conclusions involving in the geometry of hydraulic fractures can greatly match with the previous conclusions from numerical simulation and are more persuasive than that. To sum up, this new model provides some relative real evaluation results for multi-stage fracturing horizontal well technology in shale gas reservoirs. (C) 2014 Elsevier B.V. All rights reserved.
机译：提出了页岩气储层横向有限水力裂缝的MFHW压力和速率瞬态分析的新解析方法。同时，本文还同时考虑了解吸，吸附，粘性流，天然裂缝的应力敏感性，皮肤损害和井筒储存。拉普拉斯变换，线源函数，摄动方法和叠加原理被用来解决这个新模型。利用最差数值反演算法将压力和速率瞬态响应反演到实时空间中。基于这一新的解决方案，获得了具有多个有限传导性横向水力裂缝的MFHW的瞬态压力分布，绘制了类型曲线，并确定了页岩气储层中的不同流态，并分析了相关参数的影响。本文的创新和实质是将瞬变气流在有限传导性水力压裂中，水力压裂的几何形状和页岩气储层的双重孔隙特征相结合。与现有的一些页岩气储层模型相比，该新模型更为全面，可以提供相关参数的相对实际分析。此外，涉及水力裂缝几何学的结论可以与数值模拟中的先前结论高度匹配，并且更具说服力。综上所述，该新模型为页岩气藏多级压裂水平井技术提供了一些相对真实的评价结果​​。 （C）2014 Elsevier B.V.保留所有权利。

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