稠油注蒸汽热采过程中地层稳定性分析评价  

Evalution of formation stability in heavy oil reservoir of steam injection thermal production

作　　者：孙峰[1] 仝兴华[2,3] 薛世峰[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555 [2]中国石油大学储运与建筑工程学院,山东青岛266555 [3]山东大学威海分校,山东威海264209

出　　处：《中国石油大学学报（自然科学版）》2010年第6期125-128,135,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项课题(2008ZX05031-002-003-001)

摘　　要：基于多孔介质热-流-变形耦合理论,综合温度、流体渗流、骨架变形等影响因素,建立稠油热采过程中地层稳定评价模型;采用Galerkin有限元全隐式顺序迭代的方法求解耦合模型,开发相应程序定量模拟热采过程中近井壁区域地层温度、压力、有效应力等物理量的空间分布及随时间的变化特征,结合强度准则判断地层稳定性变化。数值模拟结果表明:热采过程中温度升高导致岩层骨架压应力增大,而孔隙流体压力增加则使拉伸应力增大;有效应力受温度、压力影响大幅度改变是导致近井筒区域地层失稳的重要因素。Considering the effects of reservoir temperature,fluid flow pressure and solid matrix deformation,a coupled thermal-hydraulic-mechanical（T-H-M） formation stability analysis model was presented.Galerkin finite element method with fully implicit and sequential iterative algorithm was adopted to solve the coupled governing equation.The spatial and temporal distributions of pressure,temperature and effective stress in the process of steam injection were simulated by this model.Drucker-Prager failure criterion was used to judge the condition of formation stability.The numerical simulation results indicate that the rock skeleton stress increases with the temperature rising.The tensile stress increases with pore fluid pressure increasing.Effective stress change by temperature,pressure significantly is an important factor resulting to formation instability near wellbore region.

关 键 词：稠油油藏 注蒸汽热采 热-流-变形耦合 地层稳定分析 有限元法 模拟 

分 类 号：TE345[石油与天然气工程—油气田开发工程]