Numerical Modeling and Investigation of Fluid-Driven Fracture Propagation in Reservoirs Based on a Modified Fluid-Mechanically Coupled Model in Two-Dimensional Particle Flow Code
Numerical Modeling and Investigation of Fluid-Driven Fracture Propagation in Reservoirs Based on a Modified Fluid-Mechanically Coupled Model in Two-Dimensional Particle Flow Code
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基于二维粒子流代码中改进的流力耦合模型的储层中流体驱动裂缝扩展的数值模拟和研究
DOI：
10.3390/en9090699
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发表时间：
2016-09
期刊：
影响因子：
3.2
通讯作者：
Han Zhenhua
中科院分区：
文献类型：
--
作者：
Zhou Jian;Zhang Luqing;Braun Anika;Han Zhenhua
水力压裂是通过将压裂液高压注入致密储层岩石中来增强岩体渗透性以用于页岩气开发、增强地热系统和地质碳封存的有用工具。尽管在水力压裂理论、实验和数值模拟方面取得了重大进展，但对于复杂地质条件的认识仍然有限。为了充分利用水力压裂技术，需要更好地理解流体注入引起的裂缝产生和扩展的机理。本文介绍了基于二维颗粒流程序（PFC 2D）的离散颗粒模型的发展和应用。首先，它表明，水力压裂过程的破裂压力的模拟值近似等于在不同的地应力条件下的解析计算值。此外，一系列的模拟水力压裂在主管岩石进行检查的影响，在原地应力比，流体注入速率，流体粘度的钻孔压力历史，水力裂缝的几何形状，和孔隙压力场，分别。结果表明，在各向同性介质中，水力压裂裂缝总是平行于最大主应力方向扩展。当使用高的流体注入速率时，裂缝扩展需要更高的破裂压力，并且可能形成复杂几何形状的裂缝。当使用低粘度流体时，流体可以更容易地从钻孔渗透到周围岩石中，这导致有效应力的减小并导致较低的破裂压力。此外，在近似各向同性模型中，裂缝的几何形状对流体粘度不是特别敏感。
Hydraulic fracturing is a useful tool for enhancing rock mass permeability for shale gas development, enhanced geothermal systems, and geological carbon sequestration by the high-pressure injection of a fracturing fluid into tight reservoir rocks. Although significant advances have been made in hydraulic fracturing theory, experiments, and numerical modeling, when it comes to the complexity of geological conditions knowledge is still limited. Mechanisms of fluid injection-induced fracture initiation and propagation should be better understood to take full advantage of hydraulic fracturing. This paper presents the development and application of discrete particle modeling based on two-dimensional particle flow code (PFC 2D ). Firstly, it is shown that the modeled value of the breakdown pressure for the hydraulic fracturing process is approximately equal to analytically calculated values under varied in situ stress conditions. Furthermore, a series of simulations for hydraulic fracturing in competent rock was performed to examine the influence of the in situ stress ratio, fluid injection rate, and fluid viscosity on the borehole pressure history, the geometry of hydraulic fractures, and the pore-pressure field, respectively. It was found that the hydraulic fractures in an isotropic medium always propagate parallel to the orientation of the maximum principal stress. When a high fluid injection rate is used, higher breakdown pressure is needed for fracture propagation and complex geometries of fractures can develop. When a low viscosity fluid is used, fluid can more easily penetrate from the borehole into the surrounding rock, which causes a reduction of the effective stress and leads to a lower breakdown pressure. Moreover, the geometry of the fractures is not particularly sensitive to the fluid viscosity in the approximate isotropic model.
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影响因子：
--
作者：
A. Al-Busaidi;J. Hazzard;R. P. Young
通讯作者：
A. Al-Busaidi;J. Hazzard;R. P. Young
DOI：
10.1016/c2013-0-12927-3
发表时间：
1997-03
期刊：
--
影响因子：
--
作者：
C. Yew
通讯作者：
C. Yew
影响因子：
--
作者：
D. Spence;D. Turcotte
通讯作者：
D. Spence;D. Turcotte
影响因子：
3.2
作者：
Bo Zhang-;Xiao Li;Zhaobin Zhang;Yanfang Wu;Yusong Wu;Yu Wang
通讯作者：
Bo Zhang-;Xiao Li;Zhaobin Zhang;Yanfang Wu;Yusong Wu;Yu Wang
DOI：
10.2118/686-g
发表时间：
1972-12
期刊：
Transactions of the AIME
影响因子：
--
作者：
M. K. Hubbert;David G. Willis
通讯作者：
M. K. Hubbert;David G. Willis