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Research on stress field at the top of fracture during refracturing based on displacement correlation method
Author(s): Huang Bingqing, Fan Jun, Gao Peng
Pages: 664-
667
Year: 2014
Issue:
5
Journal: Fault-Block Oil and Gas Field
Keyword: refracturing; stress field; fluid-solid coupling; displacement correlation method; stress intensity factor;
Abstract: 重复压裂技术是低渗透油田、非常规油气藏增产增效的重要措施,利用再加压打开储层的油气通道,可获取更高的开采量.新裂缝的起裂及延伸规律对重复压裂效果评价至关重要.从力学角度分析,裂缝的起裂及延伸与裂缝尖端应力强度息息相关.在饱和多孔介质固体骨架的平衡方程、流体力学和地质力学控制方程的基础上,考虑初始流体密度和孔隙度、地应力、初始孔隙压力等因素的影响,建立了适用于目标油井的储层流固耦合数学模型.以单元节点位移和单元节点孔隙压力为未知量,对该模型进行时间域有限元离散,导出了储层流固耦合的非线性有限元增量方程.根据求解的位移值、应力和应变,基于有限元软件平台利用位移相关法求解裂缝尖端应力强度因子,进行实例分析,验证了所建模型的有效性.
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