基于应力敏感的稠油油藏变启动压力梯度渗流模型与数值模拟研究  

Research on seepage model and numerical simulation of variable starting pressure gradient for heavy oil reservoirs based on pressure sensitive effect

作　　者：姜瑞忠[1] 倪庆东 张春光 张凤博 郜益华 蔺靖淇 JIANG Ruizhong;NI Qingdong;ZHANG Chunguang;ZHANG Fengbo;GAO Yihua;LIN Jingqi(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China;CNOOC Shanghai Branch,Shanghai City,200335,China;CNOOC Research Institute Co.,Ltd.,Beijing City,100028,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中海石油(中国)有限公司上海分公司,上海200335 [3]中海油研究总院有限责任公司,北京100028

出　　处：《油气地质与采收率》2021年第6期54-62,共9页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“厚层非均质性气藏产能评价及预测技术研究”(2016ZX05027004-004)。

摘　　要：稠油油藏由于其高黏度特性,因此在多孔介质中的流动表现出非达西渗流的特点。以达西模型为基础的数值模拟软件未充分考虑变启动压力梯度与压敏效应对油田生产指标的影响。鉴于实际储层的非均质性,在考虑压敏效应的基础上,将启动压力梯度处理成与流度相关的变量并考虑其方向性,从而建立稠油油藏变启动压力梯度数学模型。对数学模型进行离散化与线性化,全隐式求解压力与饱和度,将模拟器前后处理模块对接ECLIPSE,对典型稠油区块进行数值模拟研究。模拟器应用于矿场实际模型研究渗流场分布特征,结果表明:考虑启动压力梯度会减小水驱波及面积,加剧非活塞现象与层间矛盾,同时压敏效应会降低驱油效率。Due to high viscosity,heavy oil shows the non-Darcy flow in porous media.The numerical simulation software based on the Darcy model fails to fully consider the influence of variable starting pressure gradients and pressure sensitive effect on oilfield production indicators.In light of the heterogeneity of actual reservoirs and pressure sensitive effect,the starting pressure gradient was converted into a variable related to fluidity and its directionality was taken into account.Then a mathematical model of variable starting pressure gradients was constructed for heavy oil reservoirs,which was discretized and linearized to solve pressure and saturation in a fully implicit manner.The pre-processing and post-processing modules of the simulator were connected to ECLIPSE for the numerical simulation of typical heavy oil blocks,and the simulator was applied to a field model to characterize seepage field distribution.The results demonstrate that the starting pressure gradi⁃ent will reduce the water flooding swept area,aggravate the non-piston phenomenon and the inter-layer contradiction,and the pressure sensitive effect will impair oil displacement efficiency.

关 键 词：稠油油藏 非均质 变启动压力梯度 压敏效应 数值模拟 

分 类 号：TE319.1[石油与天然气工程—油气田开发工程]