低渗透碳酸盐岩油藏水驱油相似理论研究
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史兴旺(1991—),男,甘肃庆阳人,在读硕士研究生,从事油气田开发方面研究。联系电话:(010)83596796,E-mail:shixingwang15@mails.ucas.ac.cn。

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国家科技重大专项“超低渗油藏物理模拟方法与渗流机理”(2017ZX05013-001)。


Study on similarity theory of water flooding in low permeability carbonate reservoir
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    摘要:

    为更好地指导低渗透碳酸盐岩油藏水驱油物理模拟实验方案及模型参数的设计,进一步对油、水两相渗流模拟相似理论进行研究。从变形介质渗流理论出发,考虑渗透率应力敏感变化规律和启动压力梯度特征,建立了双重介质孔隙模型的非线性渗流数学模型;应用方程分析法推导出低渗透碳酸盐岩油藏水驱油物理模拟实验的相似准则;利用IMPES方法对无量纲方程进行求解,通过畸变和敏感性分析,定量确定了各相似准数的主次关系,并通过实际岩样的应力敏感实验和水驱油实验结果进行了验证。研究结果表明,基于相似理论的油、水两相渗流模型能够有效表征低渗透碳酸盐岩油藏水驱油动态变化规律。21个相似准数对目标函数的影响程度各异,可知在物理模拟设计中,当无法满足模型和原型完全相似时,应优先满足多孔介质的渗透率和饱和度、多相流体的粘度和密度以及孔隙结构的相似。

    Abstract:

    To offer better guidance to the physical simulation experiment scheme and model parameters design of water flooding in low permeability carbonate reservoirs,the similarity theory on the oil-water two-phase seepage simulation was analyzed further. Starting from seepage theory of deformation media,mathematical model of nonlinear flow for dual porosity media was established considering variation regularity of stress sensitivity of permeability and starting pressure gradient.The similarity criteria of physical water flooding simulation in the low permeability carbonate reservoir was deduced by analytic equation method. The dimensionless equation was solved using IMPES method,and the principal and subordinate relations of various similarity criteria were determined quantitatively by distortion and sensitivity analysis,which were verified by the results of stress sensitivity experiment and water flooding experiment. Results show that this model veritably represents the regularity of water flooding in the low permeability carbonate reservoir. Twenty-one similarity criteria have various effects on objective function. When the model and prototype are not completely similar in the physical simulation design,the permeability and saturation of the porous medium and the viscosity and density of multiphase fluids should be given priority,as well as the pore structure similarity.

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史兴旺,杨正明,段小浪,张亚蒲,朱光亚,肖前华,王向阳.低渗透碳酸盐岩油藏水驱油相似理论研究[J].油气地质与采收率,2018,25(1):82~89

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  • 在线发布日期: 2017-12-06