驱油剂与储层岩石作用及其对渗流特性影响

发布时间：2018-10-21 14:09

【摘要】：利用化学分析方法、现代油藏工程理论、仪器检测分析和物理模拟方法,开展了碱液浸泡对天然岩心孔隙结构的影响以及碱与表面活性剂对渗流特性影响研究,并进行了机理分析和探讨。结果表明:强碱可与目标油藏岩石中矿物成分发生剧烈溶蚀作用,造成颗粒运移和渗流阻力增加;与强碱相比,弱碱与岩石矿物反应程度较低,油藏适应性较好;与聚合物溶液相比,"碱/表面活性剂/聚合物"三元复合体系中聚合物分子线团尺寸较小,聚合物在多孔介质内滞留量减小,渗流阻力降低。非离子表面活性剂在聚合物分子链上吸附是造成聚合物分子线团尺寸增加、聚合物滞留量增大和渗流阻力增加的主要原因。
[Abstract]:By means of chemical analysis, modern reservoir engineering theory, instrument detection and analysis and physical simulation, the effect of alkali immersion on pore structure of natural core and the effect of alkali and surfactant on percolation characteristics were studied. The mechanism is analyzed and discussed. The results show that the strong alkali can dissolve violently with the mineral composition of the target reservoir rock, resulting in the increase of particle migration and percolation resistance, and the weak alkali can react with the rock mineral less than the strong alkali, and the reservoir has better adaptability. Compared with polymer solution, the size of polymer molecular coils in "alkali / surfactant / polymer" ternary composite system is smaller, the retention of polymer in porous media is reduced, and the resistance of percolation is decreased. The adsorption of Nonionic surfactants on polymer chains is the main reason for the increase of the size of polymer coils, the increase of polymer retention and the increase of percolation resistance.
【作者单位】：大庆油田有限责任公司大庆油田工程有限公司;大庆油田有限责任公司第五采油厂;东北石油大学提高油气采收率教育部重点实验室;
【基金】：国家自然科学基金面上项目“抗盐型聚合物油藏适应性及其改进方法基础研究”(51574086) 大庆油田重点科技攻关课题“杏十二区弱碱三元复合驱采出液乳化对受效影响研究”(DQYT-0505003-2015-JS-370)经费资助
【分类号】：TE312

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