Influence of the Effective Vertical Stresses on Hydraulic Fracture Initiation Pressures in Shale and Engineered Geothermal Systems Explorations
Influence of the Effective Vertical Stresses on Hydraulic Fracture Initiation Pressures in Shale and Engineered Geothermal Systems Explorations
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DOI：
10.1007/s00603-019-01841-5
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发表时间：
2019-11
影响因子：
6.2
通讯作者：
G. Gunarathna;B. G. da Silva
中科院分区：
文献类型：
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作者：
G. Gunarathna;B. G. da Silva
近年来，碳氢化合物的开采越来越依赖于页岩储层的水力压裂增产，以提高其渗透性，从而提高其生产力。工程地热系统（EGS）也一直在使用水力压裂来在热岩中产生和移动裂缝，水通过裂缝循环，随后在地表回收热量。水力压裂包括以足够的压力将流体注入岩石中，以形成新的裂缝以及打开或移动现有裂缝。这些新形成和活动的裂缝可以作为高渗透性通道来提高储层产能（Frash 2007）。利用水力压裂技术，页岩油气产量在过去十年中大幅增长（McClure 2012），并且 EGS 已越来越多地用于试点开发（Tester 2006）。虽然水力压裂已广泛应用于现场应用，但该方法所涉及的压裂过程仍不清楚。需要更好研究的变量之一是击穿压力（P击穿），特别是其随深度（即上覆应力）的变化。
In recent years, hydrocarbon extraction is relying progressively more on hydraulic fracturing stimulation of shale reservoirs to increase their permeability and, therefore, their productivity. Engineered geothermal systems (EGS) have also been using hydraulic fracturing to create and mobilize fractures in the hot rock through which water is circulated to subsequently recover its heat at the surface. Hydraulic fracturing consists of the injection of fluid into rock at an adequate pressure to create new fractures as well as to open, or mobilize, existing ones. These newly formed and mobilized fractures can serve as highly permeable pathways to enhance the reservoir productivity (Frash 2007). Taking advantage of the hydraulic fracturing technology, shale oil and gas production have grown considerably in the past decade (McClure 2012) and EGS have been increasingly used in pilot developments (Tester 2006). While hydraulic fracturing has been extensively used in field applications, the fracturing processes involved in this method are still not well understood. One of the variables that needs to be better studied is the breakdown pressure (P breakdown), particularly its variation with depth, ie, with overburden stresses.