侯大力,龚凤鸣,陈涛,孙雷,赵锐,苏杰
HOU Dali,GONG Fengming,CHEN Tao,SUN Lei,ZHAO Rui,SU Jie

• 1:油气藏地质及开发工程全国重点实验室(成都理工大学)
• 2:成都理工大学能源学院
• 3:四川越盛能源集团有限公司
• 4:中国石油西南油气田公司川东北作业分公司

摘要(Abstract)：

注CO_2开发低渗透油藏不仅能增加原油采收率，还能将CO_2埋存在地下，实现双赢。为了明确X低渗透油藏注CO_2混相驱油机理、CO_2在地层中的运移规律以及埋存机理，利用实验和数值模拟相结合的方法，从注CO_2混相特征、注CO_2参数优化和CO_2埋存评价3方面对X低渗透油藏进行研究。结果表明：地层原油注CO_2最小混相压力为26.03 MPa,CO_2有降低原油黏度和密度的作用；通过参数优化确定的推荐注采方案与衰竭开采相比，累计增油量为96.21×10~4 t，主力开发层系X4-2、X4-3提高采收率分别为9.37百分点、6.02百分点；CO_2注入地层后，随着时间的推移，在平面上不断向四周扩散，在纵向上受重力分异的作用向上运移；评价区块注CO_2驱推荐方案预计CO_2埋存量为68.08×10~4 t，其中构造埋存量、束缚埋存量、溶解埋存量和矿化埋存量分别为42.20×10~4、17.79×10~4、6.24×10~4和1.85×10~4 t。研究成果为低渗透油藏注CO_2驱及CO_2埋存提供了实验和理论的借鉴意义。
CO_2 injection in low permeability reservoir can not only increase oil recovery but also store CO_2 underground, achieving win-win situation. To clarify miscible flooding mechanism of CO_2 injection in low permeability X reservoir, migration law of CO_2 in formation, and storage mechanism, experimental and numerical simulation methods are combined to study low permeability X reservoir in terms of miscibility characteristics of CO_2 injection, optimization of CO_2 injection parameters and evaluation of CO_2 storage. The results show that minimum miscibility pressure of CO_2 with formation oil is 26.03 MPa, and CO_2 has effect of reducing oil viscosity and density. Recommended injection-production scheme determined by parameters optimization increases oil production by 96.21×10~4 t compared with depleted production, and recoveries of main development layers X4-2 and X4-3 are increased by 9.37and 6.02 percentage points, respectively. After CO_2 is injected into the formation, it spreads outwards areally and migrates upwards vertically by gravitational differentiation over time. Recommended scheme of CO_2 flooding in the block is estimated to have CO_2 storage amount of 68.08×10~4 t, including structural storage, irreducible storage, dissolution storage and mineralization storage of 42.20×10~4, 17.79×10~4, 6.24×10~4 and 1.85×10~4 t, respectively. The research provides experimental and theoretical references for CO_2 flooding and CO_2 storage in low permeability reservoirs.

关键词(KeyWords)： 低渗透油藏;CO_2驱油与埋存;方案设计;参数优化;埋存评价
low permeability reservoir;CO_2 flooding and storage;scheme design;parameter optimization;storage evaluation

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划课题“大型油气藏CO_2压裂埋存全流程关键技术指标体系及标准化”（2023YFF0614102）

作者(Author): 侯大力,龚凤鸣,陈涛,孙雷,赵锐,苏杰
HOU Dali,GONG Fengming,CHEN Tao,SUN Lei,ZHAO Rui,SU Jie

DOI: 10.19597/J.ISSN.1000-3754.202312002

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