一低渗-特低渗油藏非稳态油水相对渗透率计算模型-中国石油大学学报.PDF

2013年摇 第37卷摇 摇 摇 摇 摇 摇 中国石油大学学报(自然科学版)摇 摇 摇 摇 摇 摇 摇 摇 Vol.37摇 No.6 摇 第6期摇 摇 摇 摇 摇 摇 摇 摇 Journal of China University of Petroleum摇 摇 摇 摇 摇 摇 摇 摇 Dec.2013 摇 摇 文章编号:1673鄄5005(2013)05鄄0076鄄06摇 摇 摇 doi:10.3969/ j.issn.1673鄄5005.2013.06.012 一低渗-特低渗油藏非稳态油水相对 渗透率计算模型 吴克柳,李相方,樊兆琪,李武广,李元生,羊新州 (中国石油大学石油工程教育部重点实验室,北京 102249) 摘要:考虑低渗-特低渗储层多孔介质中油水渗流特征,建立考虑启动压力梯度、重力及毛管力影响的低渗-特低渗 油藏非稳态油水相对渗透率计算模型,进行非稳态油水相对渗透率试验,计算不同影响因素下的油水相对渗透率曲 线。 结果表明,启动压力梯度作为油水渗流的阻力,对油水相对渗透率、储层压力、剩余油饱和度、产油及产水等影 响最为显著,其次是重力,毛管力仅对油相相对渗透率有影响,对水相相对渗透率无影响。 关键词:油藏;低渗-特低渗油藏;非稳态;油水相对渗透率;启动压力梯度;毛管力;重力 中图分类号:TE311摇 摇 摇 文献标志码:A Unsteady鄄state model for calculating oil鄄water relative permeability for reservoirs with low and ultra鄄low permeability WU Ke鄄liu,LI Xiang鄄fang,FAN Zhao鄄qi,LI Wu鄄guang,LI Yuan鄄sheng,YANG Xin鄄zhou (Key Laboratoryfor PetroleumEngineering of theMinistry of Education,China University of Petroleum,Beijing 102249,China) Abstract:Based onthecharacteristicsof oilandwaterflowinporousmedia,amodelforcalculatingoil鄄waterrelativepermea鄄 bility for oil reservoirswith low and ultra鄄low permeability was developed,inwhich the effects of threshold pressure gradient, gravity and capillary pressurewere considered. A unsteady state method was used to conduct the measurement of the relative permeability,andtherelativepermeability curvesinfluencedbyvariousfactorswerethencalculated. Theresultsshow that the threshold pressuregradienthasaprominenteffectontheoil鄄waterrelativepermeability,formationpressure,residualoil satura鄄 tion,andthe recovery of oil production. The gravity also has important effect on the relative permeability and oil production, whilethe capillarypressurecanaffecttheoilrelativepermeability,butithaslittleinfluenceonthewaterrelativepermeability. Key words:reservoir;low and u