Planning of Pilot Injection of Surfactant-Polymer Composition to Improve Oil Recovery from Carbonate Reservoir of Kharyaga Oilfield and Evaluation of the Results

Y. Trushin, A. Aleshchenko, O. Zoshchenko, M. Arsamakov, I. Tkachev, D. S. Kruglov, A. Kornilov, D. Batrshin
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Abstract

The paper considers the use of a surfactant-polymer composition for the mobilization of light paraffinic oil from the D3-III carbonate reservoir at a reservoir temperature of 62°C, as well as the results of its tests in field conditions. Earlier, the composition showed its effectiveness on model carbonate cores with salinity from current (50-80 g/l) to reservoir (up to 170 g/l), in the presence of surfactants, type III microemulsions according to Winsor with oil were obtained. Based on the results of the filtration experiments performed on our own core from the productive formation D3-III, an increase in the displacement efficiency of surfactant-polymer compositions compared to water was obtained 11–14% (with a total surfactant concentration of 1%), irreversible surfactant losses in water-saturated rock–up to 0, 38 mg/g. Displacement efficiency after water and surfactant-polymer composition flooding was also estimated in the field conditions using SWCTT; its results were interpreted by various methods (analytical, in a hydrodynamic simulator), and also compared with laboratory results. Within a single-well tracer test, an assessment of the residual saturation after water filtration and injection of a surfactant-polymer composition was carried out under the following conditions: the target research radius is 3.5 m; porosity 10%, effective reservoir thickness 38 m. Based on the results of SWCTT, an increase in the displacement efficiency of 16.7% was obtained in comparison with water displacement (total surfactant concentration 1%) using an analytical method of interpretation. The adaptation of the SWCTT results on the hydrodynamic model was carried out, the most influencing parameters on the quality of adaptation were determined. The selection and justification of a pilot area for a multi-well pilot project was carried out, a sector hydrodynamic model of the site was built, and calculations were made to assess additional oil production.
Kharyaga油田碳酸盐油藏注表面活性剂-聚合物组份提高采收率试点规划及效果评价
本文研究了在储层温度为62℃的条件下,使用表面活性剂-聚合物组合物对D3-III碳酸盐岩储层中的轻质石蜡油进行动员,并对其在现场条件下的试验结果进行了分析。此前,该组合物在盐度范围从当前(50-80 g/l)到储层(高达170 g/l)的模型碳酸盐岩心上显示了其有效性,在表面活性剂的存在下,根据Winsor的描述,获得了带油的III型微乳液。根据我们在生产地层D3-III的岩心上进行的过滤实验结果,表面活性剂-聚合物组合物的驱替效率比水提高了11-14%(表面活性剂总浓度为1%),表面活性剂在水饱和岩石中的不可逆损失高达0.38 mg/g。在现场条件下,采用SWCTT技术对水驱和表面活性剂-聚合物复合驱后的驱替效率进行了评估;其结果用各种方法(解析法,在流体动力模拟器中)解释,并与实验室结果进行了比较。在单井示踪剂测试中,在以下条件下,对水过滤和注入表面活性剂-聚合物组合物后的剩余饱和度进行了评估:目标研究半径为3.5 m;孔隙度10%,有效储层厚度38 m。基于SWCTT的结果,采用解析解释方法,与水驱(表面活性剂总浓度为1%)相比,驱替效率提高了16.7%。对SWCTT结果进行了水动力模型的自适应,确定了对自适应质量影响最大的参数。对多井试验项目的试验区进行了选择和论证,建立了现场的区域流体动力学模型,并进行了计算,以评估额外的石油产量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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