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Microemulsion Rheology and Alkaline-surfactant-polymer Flooding

机译：微乳液流变学和碱性表面活性剂 - 聚合物洪水

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Workflows to assess the technical and economic suitability of an enhanced oil recovery (EOR) technique for a particular field generally involve laboratory testing, such as core flooding experiments, and field-scale reservoir modelling. When building these field scale models and interpreting laboratory experiments it is important to understand the flow properties of all phases present in the particular EOR process. In alkaline-surfactant-polymer flooding (ASP) flooding, surface-active molecules decrease the interfacial tension between water and crude oil, increasing the capillary number, and recovering oil trapped in the reservoir pores. The ultra-low interfacial tensions needed for ASP flooding occur when the surface active molecules are equally soluble in the brine and oil phases. Under these conditions, in addition to the brine and oil phases, a third thermodynamically stable phase is formed. This third phase is known as a microemulsion. While the flow properties of crude oil and polymer-enriched brine are well understood, little has been done to characterize the microemulsion phase, particularly with respect to rheology in porous media. In this study, larger volumes of microemulsion, with and without polymer, are generated using a model ASP system. These microemulsions are studied using conventional shear rheology. Additionally, an in situ, or apparent, viscosity is recovered from core flooding experiments in Berea sandstone, where pressure drop across the core is recorded as a function of the flow rate of the microemulsion through the core. The implication of these results for ASP flooding is discussed.
机译：工作流程以评估特定领域的增强的储油（EOR）技术的技术和经济适用性通常涉及实验室检测，例如核心泛滥实验，以及现场规模的储层建模。在构建这些场比例模型和解释实验室实验时，重要的是要理解特定EOR过程中存在的所有阶段的流动性。在碱性表面活性剂 - 聚合物泛滥（ASP）泛滥中，表面活性分子降低了水和原油之间的界面张力，增加了毛细数量，并恢复在储层孔中捕获的油。当表面活性分子在盐水和油阶段同样可溶于ASP泛洪时，发生了超低的界面张力。在这些条件下，除了盐水和油相之外，形成第三热力学稳定的相。该第三阶段称为微乳液。虽然原油和富含聚合物富集的盐水的流动性很好地，但已经少完成了表征微乳液相，特别是关于多孔介质中的流变学。在该研究中，使用模型ASP系统产生较大体积的微乳液，具有和不具有聚合物的微乳液。使用常规剪切流变学研究了这些微乳液。此外，原位，或显而易见的，粘度是从贝雷砂岩岩心驱替试验，其中在整个芯的压力降被记录为通过芯微乳液的流速的功能恢复。讨论了这些结果对asp洪水的影响。

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