用于 CO2 提高采收率和储存的组合封堵系统的实验评价,Energy & Fuels

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用于 CO2 提高采收率和储存的组合封堵系统的实验评价
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-03-07 , DOI: 10.1021/acs.energyfuels.3c00246
Shengen Chen ₁ , Jie Li ₁ , Sen Chen ₁ , Junhui Qin ₂ , Guiqi Wang ₂ , Yonggang Yi ₁ , Liwei Zhang ₁ , Rui Wang ₁ , Daoyi Zhu ₂

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高性能CO ₂提高石油采收率（IOR）和封存技术是全球油田公司实现零碳目标最有希望的措施之一。由于大多数油藏的严重非均质性和CO _{2与储层流体之间显着的密度差异，CO}₂ -IOR和封存的效率通常是有限的。本文采用高温高压30 cm岩心驱替实验，研究了长砂岩岩心单封堵和复合封堵系统的CO _{2波及控制性能。}评估的单一系统包括聚合物凝胶、CO ₂泡沫和 CO ₂响应性增稠聚合物（CO₂ -RTP) 系统。组合系统是它们三个的成对组合。结果表明，凝胶体系的压升和最大突破压力是三种单堵体系中最高的。其堵漏效率最高，达到86.13%。同时，其产气减产率也是最高的，达到了95.71%。在平行30 cm岩心封堵实验中，三种组合封堵体系均表现出良好的封堵和CO ₂一致性改进性能。其中，含聚合物凝胶的组合封堵体系封堵效果较好，减气率达到90%左右。与单一系统相比，组合封堵系统具有易注易深传播的优点，可显着提高CO ₂波及度和采收率。该研究成果可为当前油田棘手的CO ₂窜流问题提供实验认识和理论指导。

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Experimental Evaluation of Combined Plugging System for CO2-Improved Oil Recovery and Storage

High-performance CO₂-improved oil recovery (IOR) and storage technology is one of the most promising measures for global oilfield companies to achieve zero carbon targets. Due to the severe heterogeneity of most petroleum reservoirs and the significant density difference between CO₂ and reservoir fluid, the efficiency of CO₂-IOR and storage is usually limited. In this paper, a high-temperature and high-pressure 30 cm core displacement experiment was used to study the CO₂ conformance control performance of both the single- and the combined plugging system in long sandstone cores. The single systems evaluated included polymer gels, CO₂ foams, and CO₂-responsive thickening polymer (CO₂-RTP) systems. The combined systems were pairwise combinations of the three of them. Results show that the pressure rise and maximum breakthrough pressure of the gel system were the highest among three single-plugging systems. Its plugging efficiency was the highest, reaching 86.13%. At the same time, its gas production reduction rate was also the highest, reaching 95.71%. In the parallel 30 cm core plugging experiments, three combined plugging systems all showed excellent plugging and CO₂ conformance improvement performance. Among them, the combined plugging systems containing polymer gels had larger plugging efficiency, and their gas production reduction ratios reached about 90%. Compared with single systems, the combined plugging systems had the advantages of easy injection and in-depth propagation, which can significantly improve CO₂ conformance and oil recovery. The research results of this study can provide the experimental understanding and theoretical guidance for the current tricky oilfield problems of CO₂ channeling.

更新日期：2023-03-07

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