不同驱油体系在贝雷岩心中的驱替特征

发布时间：2018-03-14 06:23

本文选题：贝雷岩心　切入点：孔隙结构　出处：《大庆石油地质与开发》2017年02期 　论文类型：期刊论文

【摘要】：为了保持室内岩心驱油实验中孔隙结构对驱替剂驱油效果的影响与实际砂岩油层孔隙结构的影响一致,使用气测渗透率300×10~(-3)μm~2的贝雷、人造、天然均质岩心进行常规压汞实验和驱油实验。研究了不同类型岩心孔隙结构差异及其对驱油效果的影响,分析了不同驱油体系在贝雷岩心中的采收率及注入压力变化。实验结果表明:贝雷岩心与天然岩心在孔喉结构上有一定的相似性,能够充分体现各种体系的驱油效果;在贝雷岩心中,保持体系黏度、表面活性剂质量浓度相同条件下,化学驱采收率由高到低顺序为弱碱三元体系、强碱三元体系、聚合物—甜菜碱表活剂体系、聚合物体系,三元复合驱后续水驱阶段采出的油量对化学驱采收率的贡献较大,驱油过程中体系是否发生乳化对驱油体系的驱油效果存在明显影响;聚合物溶液和三元体系驱替过程中的压力存在明显的不同,聚驱过程中的主要特点是注化学剂过程结束后压力快速下降,复合驱压力变化曲线主要特点是注化学剂结束后水驱阶段压力先上升后下降,乳化—捕集机理是造成注入压力曲线形态差异的主要原因。
[Abstract]:In order to keep the effect of pore structure on displacement agent oil displacement in laboratory core flooding experiment consistent with that of actual sandstone reservoir pore structure, a gas measurement permeability of 300 脳 10 ~ (-3) 渭 m ~ (2) 渭 m ~ (2) is used. The conventional mercury injection experiment and oil displacement experiment were carried out in natural homogeneous cores. The pore structure differences of different types of cores and their effects on oil displacement were studied. The oil recovery and injection pressure variation of different oil displacement systems in the Bayley core are analyzed. The experimental results show that there are certain similarities in pore throat structure between the Bayley core and the natural core, which can fully reflect the oil displacement effect of various systems. In the core of Bayley rock, under the condition of keeping the viscosity of the system and the same mass concentration of surfactant, the recovery of chemical flooding from high to low order is weak alkali ternary system, strong alkali ternary system, polymer-betaine apparent active agent system, polymer system, The amount of oil produced in the subsequent water drive stage of ASP flooding has a great contribution to chemical flooding recovery. Whether emulsification occurs in the flooding process has a significant impact on the flooding effect of the flooding system. The pressure of polymer solution and ternary system is obviously different from that of ternary system. The main characteristic of polymer flooding is that the pressure decreases rapidly after the injection of chemical agent. The main characteristic of the pressure variation curve of composite flooding is that the pressure first rises and then decreases after the injection of chemical agent, and the emulsification-trapping mechanism is the main reason for the difference of injection pressure curve morphology.
【作者单位】：东北石油大学提高采收率教育部重点实验室;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2011ZX05010)
【分类号】：TE357.46

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