低渗透油藏启动压力梯度实验研究 |
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引用本文: | 汪全林,唐海,吕栋梁,彭得兵,郭粉转.低渗透油藏启动压力梯度实验研究[J].油气地质与采收率,2011,18(1). |
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作者姓名: | 汪全林 唐海 吕栋梁 彭得兵 郭粉转 |
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作者单位: | 西南石油大学,石油工程学院,四川,成都,610500 |
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基金项目: | 国家科技重大专项"大型油气田及煤层气开发"项目13课题5 |
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摘 要: | 随着低渗透油藏的开发,启动压力梯度对开发有不可忽视的影响,它是流体边界层性质异常和流体塑性的综合表现形式.选取青海某油田低渗透油藏天然岩心,根据实验数据拟合结果,分别比较了各渗流方程的准确性.结果表明,幂函数和二次多项式的拟合结果最佳.根据所得启动压力梯度,分别讨论了启动压力梯度与渗透率、流体粘度、流度的关系.研究表明,低渗透油藏启动压力梯度与渗透率、流度成反比,与流体粘度成正比,并且与渗透率和流度之间有较好的乘幂关系.从高才尼-卡尔曼公式出发,得出了启动压力梯度与岩石孔隙度、孔道半径成反比,与流体粘度、孔道迂曲度、比面成正比.从推导的公式可知,岩石孔道半径和迂曲度对启动压力梯度的影响比孔隙度和流体粘度大.该研究成果对油田生产现场减小启动压力,降低渗流阻力有着一定的指导意义.
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关 键 词: | 低渗透油藏 渗流 启动压力梯度 流度 孔隙度 流体粘度 渗透率 |
An experimental study on threshold pressure gradient in low permeability reservoir |
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Affiliation: | Wang Quanlin,Tang Hai,Lü Dongliang et al.School of Petroleum Engineering,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China |
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Abstract: | With the exploration of low-permeability reservoirs,threshold pressure gradient can not be ignored in the process of ex-ploration.The abnormal property of boundary and the plastic flow of oil are thought to be the cause of the threshold pressure gradi-ent in the low permeability.Selecting the core of low permeability reservoir,and using experimental methods,the accuracy of flu-id equations is verified respectively.Research shows that the matching of power laws and quadratic polynomial are the best among all... |
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