摘要
苏北盆地复杂断块油藏是中国东部断陷盆地油藏的典型代表,在该区开展CCUS-EOR技术攻关与工程实践,对中国CCUS产业的高质量发展具有重要的现实意义。为此,以苏北盆地复杂断块油藏为对象,针对“碎、低、薄、深、散”的油藏地质特征,以及CCUS应用中难以构建整体井网、无法规模化建设地面设施的难题,开展了油藏CCUS-EOR全流程技术攻关与矿场实践,构建了全流程技术体系,涵盖室内实验、油藏适应性评价、开发模式优化及配套工程等,并验证技术的可靠性与可行性。研究结果表明:①阐明了CO_(2)-水交替驱通过水相增阻和CO_(2)超覆作用实现了平面和纵向扩大波及范围、压驱+CO_(2)驱形成缝网增渗—高压建驱—扩散促吸—降黏混相等多维度增效机制的机理;②建立了“相态分析—驱替模拟—微观表征—机理揭示”的室内实验评价体系、含30项指标的CO_(2)驱油封存适应性评价体系,以及块状混相驱、大倾角重力稳定驱等4种开发模式;③研发形成了低成本捕集—输送—回注工艺和安全平稳注采工艺技术系列。结论认为,苏北盆地复杂断块油藏实践并形成的CCUS-EOR关键技术,可以为中国复杂断块油藏开展CCUS-EOR驱油封存实践提供关键技术支撑与重要示范参考。
Complex fault-block reservoirs in the Subei Basin are typical oil accumulations in fault basins in eastern China.Development and engineering application of CCUS-EOR technologies in these reservoirs are of vital practical significance to the high-quality growth of China's CCUS industry.With the complex fault-block reservoirs in the Subei Basin as the research object,in response to the geological characteristics of fragmented distribution,low permeability,small thickness,large depth and disperse configuration,as well as the difficulties in establishing an overall well pattern and building large-scale surface facilities,a whole-process technical breakthrough and field practice of CCUS-EOR for oil reservoirs were carried out.A system of whole-process techniques,covering laboratory tests,reservoir adaptability evaluation,development mode optimization,and supporting projects,was established,and their reliability and feasibility were verified.The following results are obtained.First,the mechanisms of EOR processes are clarified.For example,water alternating CO_(2)(WAC)achieves horizontal and vertical sweep expansions by enhanced water flow resistance and CO_(2) override;water flooding is synergized with CO_(2) flooding to realize recovery enhancement in multiple dimensions,such as fracture creation for improving the permeability,high pressure for building driving force,diffusion for facilitating adsorption,and viscosity reduction for reaching miscibility.Second,a laboratory test evaluation system involving phase analysis,displacement simulation,microscopic characterization and mechanism investigation,a CCUS-EOR adaptability evaluation system incorporating 30 indexes,and four development modes including massive miscible flooding and large-dip gravity stable flooding are established.Third,the technologies concerning lowcost capture,transport&reinjection process and safe and stable injection&production process are developed.It is concluded that the key technologies of CCUS-EOR formed in the engineering practices in the complex fault-block reservoirs in the Subei Basin provide technical support and demonstrative reference for CCUS-EOR in similar complex fault-block reservoirs in China.
作者
姚红生
邱伟生
周德华
钱洋慧
高和群
陈雨菡
YAO Hongsheng;QIU Weisheng;ZHOU Dehua;QIAN Yanghui;GAO Hequn;CHEN Yuhan(Sinopec East China Oil&Gas Company,Nanjing,Jiangsu 210011,China;China Petroleum&Chemical Corporation,Beijing 100728,China)
出处
《天然气工业》
北大核心
2025年第9期212-222,共11页
Natural Gas Industry
基金
国家科技重大专项项目“CO_(2)驱大幅提高采收率与长期封存技术”(编号:2024ZD1406600)
中国石化华东油气分公司科技项目“低渗油藏CO_(2)驱中后期控窜提效技术研究”(编号:HDF/KJ2024-07)。
关键词
苏北盆地
复杂断块油藏
CCUS-EOR
油藏工程
碳捕集
关键技术
产出气回注
Subei Basin
Complex fault-block reservoir
CCUS-EOR
Reservoir engineering
Carbon capture
Key technique
Produced gas re-injection
