工程参数对深层页岩水库中断裂垂直传播的影响:基于FEM的数值研究
Shikun Zhang1,2, Songze Liao3, Shuangming Li1,2
1State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China.
ACS omega
|February 5, 2024
概括
这项研究模拟了深层页岩中的水力压裂,揭示了形成潜水和速率对断裂几何学的影响. 从强层到弱层的裂变增强了储连接,这对于优化页岩气提取至关重要.
科学领域:
- 石油工程是石油工程中的一个.
- 地质力学 地质力学
- 计算流体动力学的流体动力学.
背景情况:
- 深层页岩中的液压断裂几何结构复杂,受到岩石特性和应力变化的影响.
- 现有的研究往往忽视了水库沉降,床层平面和纵向岩石不均的综合影响.
- 需要全面了解,以优化多层页岩储中的裂变.
研究的目的:
- 开发一个3D数值模型用于多水库水力压裂,考虑到床层平面和岩石不均性.
- 为了研究形成俯冲角度,穿孔层位置和速率对骨折形态学的影响.
- 为优化深层页岩水库中的液压压裂提供理论指导.
主要方法:
- 开发了一个三维 (3D) 有限元素方法 (FEM) 数值模型.
- 纳入了德鲁克-普拉格弹性-可塑性标准,用于深层页岩的可塑性.
- 模拟水力压裂,考虑水库深度,床面接口和纵向不均性.
主要成果:
- 形成浸泡影响断裂形态和接口相互作用;较高的浸泡并不总是意味着更容易的流体进入.
- 从高强度水库到低强度水库的断裂改善了断裂高度和水库之间的连接.
- 速率严重影响垂直断裂传播;低速率可以限制穿孔层的传播,特别是在高接口强度下.
结论:
- 床层平面接口在浸泡页岩水库中显著影响断裂传播.
- 优化速率和从更强的层开始断裂是提高断裂高度和连接性的关键.
- 床面接口的能量消耗可能会限制深层页岩水库的断裂高度.
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