The influence of stress and natural fracture on a stimulated deep shale reservoir using the boundary element method

IF 4.2 3区 工程技术 Q2 ENERGY & FUELS
Songze Liao , Ziming Zhang , Jinghong Hu , Yuan Zhang
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引用次数: 0

Abstract

Hydraulic fracturing plays a critical role in enhancing shale gas production in deep shale reservoirs. Conventional hydraulic fracturing simulation methods rely on prefabricated grids, which can be hindered by the challenge of being computationally overpowered. This study proposes an efficient fracturing simulator to analyze fracture morphology during hydraulic fracturing processes in deep shale gas reservoirs. The simulator integrates the boundary element displacement discontinuity method and the finite volume method to model the fluid-solid coupling process by employing a pseudo-3D fracture model to calculate the fracture height. In particular, the Broyden iteration method was introduced to improve the computational efficiency and model robustness; it achieved a 46.6 % reduction in computation time compared to the Newton-Raphson method. The influences of horizontal stress differences, natural fracture density, and natural fracture angle on the modified zone of the reservoir were simulated, and the following results were observed. (1) High stress difference reservoirs have smaller stimulated reservoir area than low stress difference reservoirs. (2) A higher natural fracture angle resulted in larger modification zones at low stress differences, while the effect of a natural fracture angle at high stress differences was not significant. (3) High-density and long natural fracture zones played a significant role in enhancing the stimulated reservoir area. These findings are critical for comprehending the impact of geological parameters on deep shale reservoirs.
应用边界元法研究应力和天然裂缝对深部页岩储层的影响
水力压裂在深层页岩储层提高页岩气产量中起着关键作用。传统的水力压裂模拟方法依赖于预制网格,这可能会受到计算能力过剩的挑战。本文提出了一种高效的压裂模拟器,用于分析深层页岩气藏水力压裂过程中的裂缝形态。该仿真器结合边界元位移不连续法和有限体积法模拟流固耦合过程,采用拟三维裂缝模型计算裂缝高度。特别引入了Broyden迭代法,提高了计算效率和模型鲁棒性;与Newton-Raphson方法相比,它的计算时间减少了46.6%。模拟水平应力差、天然裂缝密度、天然裂缝角度对储层改造带的影响,观察到以下结果:(1)高应力差油藏的增产面积小于低应力差油藏。(2)在低应力差条件下,天然裂缝角越大,改造区越大,而在高应力差条件下,天然裂缝角的影响不显著。(3)高密度长天然裂缝带对提高改造储层面积有显著作用。这些发现对于理解地质参数对深层页岩储层的影响至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Natural Gas Industry B
Natural Gas Industry B Earth and Planetary Sciences-Geology
CiteScore
5.80
自引率
6.10%
发文量
46
审稿时长
79 days
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