Design of Laboratory Studies to Develop the Chemical Formulation for Surfactant-Polymer Flooding

D. Gospodarev, I. Lymar, A. Rakutko, A. Antuseva, D. Tkachev
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Abstract

Nowadays, chemical EOR methods are becoming more and more relevant, among which the alkali-surfactant-polymer flooding is of particular interest. The efficiency of this technology largely depends on the correct choice of the components of chemical formulation, which should be based on a set of laboratory experiments carried out in a given sequence. This paper presents a methodological approach to laboratory studies in order to develop an optimal surfactant-polymer formulation, taking into account the geological and physical characteristics of the target field and the properties of reservoir fluids. The experimental part of the research work was carried out in several stages, involving the analysis of the physicochemical characteristics of reservoir oil, the screening studies of surfactant and polymer samples, as well as a series of coreflood tests with a selected chemical formulation on the terrigenous reservoir models. During screening studies, the solubility and compatibility of the chemical components, the phase behavior of surfactant solutions with oil at different salinity values and water-oil ratios, static adsorption of chemicals on the rock and their thermal stability at reservoir temperature were investigated. Optimization of the chemical formulation was based on the results of IFT measurements of the surfactant solutions and rheological studies of the polymer solutions. At the stage of coreflood tests, physical simulation of the surfactant-polymer flooding was carried out on reservoir models using natural core material in order to optimize the composition and slug size of the developed chemical formulation. The obtained results of the displacement experiment were matched by numerical 1D simulation. Based on the results of the studies performed, an effective surfactant-polymer formulation has been designed, which provides the ultra-low IFT (2.8·10−4 mN/m) values and the ability to form stable middle-phase microemulsions when interacting with oil. The findings of thermal stability and static adsorption experiments confirmed a feasibility of selected chemicals for practical application. Within the framework of the study, the key technical parameters of proposed formulation were determined, which are required for up-scaled simulation study of the chemical flooding process at pilot site.
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开发表面活性剂-聚合物驱化学配方的实验室研究设计
目前,化学提高采收率的方法越来越受到人们的关注,其中碱-表面活性剂-聚合物驱尤其受到人们的关注。该技术的效率在很大程度上取决于化学配方成分的正确选择,而化学配方成分的选择应基于按给定顺序进行的一套实验室实验。本文提出了一种实验室研究方法,以开发最佳的表面活性剂-聚合物配方,同时考虑到目标油田的地质和物理特征以及储层流体的性质。研究工作的实验部分分几个阶段进行,包括储层油的物理化学特征分析、表面活性剂和聚合物样品的筛选研究,以及在陆源储层模型上用选定的化学配方进行一系列岩心驱油试验。在筛选研究中,研究了化学成分的溶解度和相容性、表面活性剂溶液在不同矿化度和水油比下与油的相行为、化学物质在岩石上的静态吸附及其在储层温度下的热稳定性。化学配方的优化是基于表面活性剂溶液的IFT测量结果和聚合物溶液的流变学研究。在岩心驱替试验阶段,利用天然岩心材料对油藏模型进行了表面活性剂-聚合物驱的物理模拟,以优化开发的化学配方的组成和段塞尺寸。数值模拟结果与位移实验结果吻合较好。基于研究结果,设计了一种有效的表面活性剂-聚合物配方,该配方提供了超低的IFT(2.8·10−4 mN/m)值,并且能够在与油相互作用时形成稳定的中相微乳液。热稳定性和静态吸附实验的结果证实了所选化学物质实际应用的可行性。在研究框架内,确定了建议配方的关键技术参数,为中试现场化学驱过程的规模化模拟研究提供了必要条件。
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