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低渗透油藏油水两相启动压力梯度变化规律研究
引用本文:李爱芬,刘敏,张化强,李春芹,姚军.低渗透油藏油水两相启动压力梯度变化规律研究[J].西安石油大学学报(自然科学版),2010,25(6).
作者姓名:李爱芬  刘敏  张化强  李春芹  姚军
作者单位:1. 中国石油大学(华东),山东,东营,257061
2. 塔里木油田公司,开发事业部,新疆,库尔勒,841000
3. 中石化胜利油田分公司,纯梁采油厂,山东,东营,256504
基金项目:中国石油化工股份公司科技攻关项目
摘    要:低渗油藏单相渗流启动压力梯度目前已进行了大量研究,但油水两相启动压力目前研究很少,没有明确的结论.较系统地研究了两相启动压力梯度产生原因及变化规律,从启动压力梯度定义出发研究了两相启动压力梯度的测定方法.用胜利油田天然低渗岩心测定了不同渗透率岩心油水两相启动压力梯度与含水饱和度的关系,通过数据回归建立了油水两相启动压力梯度与渗透率、饱和度之间的经验关系式.实验结果表明:油水两相同时渗流时,两相的启动压力梯度相等,随含水饱和度的增加而呈线性降低的趋势,并且渗透率越低的岩心,降低的趋势越明显.建立了根据岩石的物性预测研究区块两相启动压力梯度的经验方法.

关 键 词:低渗油藏  两相渗流  启动压力梯度  实验研究  经验公式

Experimental study on threshold pressure gradient of oil-water two-phase seepage in low permeability reservoirs
LI Ai-fen,LIU Min,ZHANG Hua-qiang,LI Chun-qin,YAO Jun.Experimental study on threshold pressure gradient of oil-water two-phase seepage in low permeability reservoirs[J].Journal of Xian Shiyou University,2010,25(6).
Authors:LI Ai-fen  LIU Min  ZHANG Hua-qiang  LI Chun-qin  YAO Jun
Abstract:At present,a large amount of study on the threshold pressure gradient of oil or water single-phase seepage in low permeability reservoirs is carried out,but the study on the threshold pressure gradient of oil-water two-phase seepage is carried out a little.The measurement method for the threshold pressure gradient of oil-water two-phase seepage is proposed from the definition of threshold pressure gradient.The variation law of the threshold pressure gradient of oil-water two-phase seepage with water saturation are measured using the natural cores of different permeability from Shengli Oilfield,and the empirical formula between the threshold pressure gradient and the permeability and water saturation of cores are obtained by the regression of the experimental data.The experimental results show that there is the same threshold pressure gradient when the seepage of oil and water is carried out at the same time,and that the threshold pressure gradient will linearly reduce with the increase of water saturation and the lower the permeability of the cores,the greater the reduction of the threshold pressure gradient.The method for predicting the threshold pressure gradient of oil-water two-phase seepage according to the physical property of reservoir in studied area is presented.
Keywords:low permeability reservoir  oil-water two-phase seepage  threshold pressure gradient  experimental study  empirical formula
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