摘要
基于Biot线弹性接触理论建立流体与基质之间的本构方程,采用虚拟单元法对岩石应力应变场进行离散求解。基于连续损伤模型引入损伤因子,建立相应破裂准则,从而定量描述压驱注水过程中裂缝动态扩展情况。建立针对低渗透油藏压驱注水的数值模拟方法,开展压驱注水对开发效果的影响研究。模拟结果表明:压驱注水能够改善基质内油水渗流能力,扩大水驱波及面积;天然裂缝系统在压驱注水过程中能够被快速激活,从而建立了油水井间有效压力传播系统;早期压驱注水可以保持较高地层压力,提高累产油量且降低产量递减速度,从而提高最终采收率。
Based on Biot linear elastic theory,we established constitutive equations of interaction between fluid.A rock and virtual element method was employed to solve the discrete seepage equations.Meanwhile,in a continuous damage model,a damage factor was introduced and corresponding failure criterion was established to describe quantitatively the fracture propagation.Furthermore,influence factors of fracture-flooding in a low permeability reservoir were investigated in typical well patterns.It shows that the coupled method simulates fracture propagation effectively during the fracture-flooding process.It also revealed that large water injection improves effectively oil-water seepage capacity in the matrix,expands the water flooding area,and improves significantly recovery rate of the well pattern.Additionally,fracture-flooding activates quickly the nature fracture system in the formation of an effective propagation system.Early fracture-flooding maintains a higher formation pressure,increases the cumulative oil production and reduces the rate of decline in production,thereby improving the ultimate recovery rate of the reservoir.
作者
察鲁明
冯其红
王森
徐世乾
刘高文
黄文欢
CHA Luming;FENG Qihong;WANG Sen;XU Shiqian;LIU Gaowen;HUANG Wenhuan(Petroleum Engineering College,China University of Petroleum(East China),Qingdao,Shandong 266580,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Chunliang Oil Production Plant,Sinopec,Shengli Oilfield Company,Boxing,Shandong 256540,China)
出处
《计算物理》
CSCD
北大核心
2023年第1期81-90,共10页
Chinese Journal of Computational Physics
基金
国家自然科学基金(U1762213)资助项目。
关键词
压驱注水
虚拟单元法
连续损伤模型
数值模拟
fracture-flooding
virtual element method
continuous damage model
numerical simulation
