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Numerical investigation on the critical factors in successfully creating fracture network in heterogeneous shale reservoirs
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.jngse.2018.09.019
Chuang Liu , Xu Jin , Fang Shi , DeTang Lu , He Liu , HengAn Wu

Abstract The heterogeneous characteristics of shale formations play a significant role in creating a fracture network during stimulation treatments. The hydraulic fracturing in naturally fractured shale formations is investigated using an explicitly integrated discrete-finite element approach. Parametric studies are presented for the distribution of natural fractures, rock toughness, in-situ stress, the layers properties and the injection rate. Numerical results show that the distribution patterns of natural fractures determine the creation of a fracture network. The propagation of hydraulic fracture mainly along parallel distributed natural fractures results in several branch fractures. The weak interfaces between different layers will alter the propagation direction of hydraulic fractures to the horizontal plane, which facilitates to intersect with the far field of natural fractures. The initiation and opening of natural fractures are confined in large in-situ stresses and stress contrast formations, which is unfavorable to generate a large field of fracture network. The fracture complexity will be significantly improved in the reservoirs of axis-orientated natural fractures as simultaneous fracturing stimulation is implemented. The results presented in this paper provide some new insights into generating a fracture network to optimize hydraulic fracturing designs of shale gas reservoirs.

中文翻译:

非均质页岩储层成功形成裂缝网络关键因素的数值研究

摘要 页岩地层的非均质特征在增产处理过程中对裂缝网络的形成起着重要作用。使用明确集成的离散有限元方法研究天然裂缝页岩地层中的水力压裂。对天然裂缝的分布、岩石韧性、地应力、地层特性和注入速率进行了参数研究。数值结果表明,天然裂缝的分布模式决定了裂缝网络的形成。水力压裂主要沿平行分布的天然裂缝扩展,产生多条分支裂缝。不同层间的弱界面会改变水力裂缝向水平面的扩展方向,这有利于与天然裂缝的远场相交。天然裂缝的起裂和张开局限在大的地应力和应力对比地层中,不利于产生大面积的裂缝网络。随着同时压裂改造的实施,轴向天然裂缝储层的裂缝复杂性将得到显着改善。本文提出的结果为生成裂缝网络以优化页岩气储层的水力压裂设计提供了一些新见解。随着同时压裂改造的实施,轴向天然裂缝储层的裂缝复杂性将得到显着改善。本文提出的结果为生成裂缝网络以优化页岩气储层的水力压裂设计提供了一些新见解。随着同时压裂改造的实施,轴向天然裂缝储层的裂缝复杂性将得到显着改善。本文提出的结果为生成裂缝网络以优化页岩气储层的水力压裂设计提供了一些新见解。
更新日期:2018-11-01
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