554. 表活剂辅助CO2 吞吐提高致密砾岩油藏采收率的机理与参数优化研究
Mechanism and Parameter Optimization of Surfactant详细内容
中国致密砾岩油藏储量丰富(28.3×10⁸ t),但普遍具有“低孔低渗、黏土含量高、孔喉结构复杂”等特点,常规注水开发效果差。本文以新疆油田某致密砾岩区块为例,建立“多相-多组分-双重孔隙介质”数值模型,并将高压压汞获得的纳米孔喉分布与自研 MATLAB PVT 包耦合,把纳米限域效应引起的相图偏移嵌入 CMG 模拟框架。通过系统敏感性分析,定量评价储层物性、完井与操作参数对 SA-CO₂-HnP(表面活性剂辅助 CO₂ 吞吐)开发效果的影响。
中国石油新疆油田分公司勘探开发研究院




China possesses abundant tight conglomerate oil resources. However, these reservoirs are typically characterized by low porosity and permeability, high clay mineral content, and complex pore structures, resulting in poor performance of conventional waterflooding development. Challenges including insufficient energy replenishment and high flow resistance ultimately lead to low oil recovery factors. This study systematically investigates surfactant-assisted CO2 huff-n-puff (SA-CO2-HnP) for enhanced oil recovery in tight conglomerate reservoirs. For a tight conglomerate reservoir in a Xinjiang block, a fully implicit, multiphase, multicomponent dual-porosity numerical model was established. By integrating pore–throat distributions acquired through high-pressure mercury intrusion with a self-developed MATLAB PVT package, nanoconfinement-induced shifts in the phase envelope were rigorously embedded into the simulation framework. The calibrated model was subsequently employed to conduct a comprehensive sensitivity analysis, quantitatively delineating the influence of petrophysical, completion, and operational variables on production performance. Simulation results demonstrate that compared to conventional CO2 huff-n-puff, the addition of surfactants increases the cumulative recovery factor by 3.5 percentage points over a 20-year production period. The enhancement mechanisms primarily include reducing CO2–oil interfacial tension (IFT) and minimum miscibility pressure (MMP), improving reservoir wettability, and promoting CO2 dissolution and diffusion in crude oil. Sensitivity analysis reveals that injection duration, injection pressure, and injection rate significantly influence recovery efficiency, while soaking time exhibits relatively limited impact. Moreover, an optimal surfactant concentration (0.0003 mole fraction) exists; excessive concentrations lead to diminished enhancement effects due to competitive adsorption and pore blockage. This study demonstrates that SA-CO2-HnP technology offers favorable economic viability and operational feasibility, providing theoretical foundation and parameter optimization guidance for efficient tight conglomerate oil reservoir development.
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