CO2混相压裂液对低渗储层岩石的微观作用机理
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1.冀东油田分公司;2.油气钻采湖北省重点实验室长江大学

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Microscopic Mechanism of CO2 Miscible Fracturing Fluid on Low Permeability Reservoir Rocks
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Hubei Key Laboratory of oil and gas drilling and production Yangtze University,Wuhan

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    摘要:

    为明确CO2混相压裂液与储层岩石的作用机理,以柳赞断块储层岩心为实例,利用岩心驱替、SEM、XRD和CT等实验方法开展CO2混相压裂液体系(不返排酸、CO2和不同添加剂)在地层压力和地层温度下与岩石相互作用前后岩心孔隙结构、岩石矿物成分及渗透率的变化。研究表明:不返排酸和CO2与不同水溶性添加剂混合形成碳酸溶液均具有溶蚀长石和粘土矿物的作用,且优先溶蚀长石,溶蚀后可生成高岭石和石英等矿物,其中不返排酸的溶蚀作用最强,其次是CO2与增溶剂混合液、CO2与降粘剂混合液;CO2混相压裂液注入前后液测渗透率与气测渗透率呈相同的增大趋势,且液测渗透率增大幅度随气测渗透率的变化关系表现为很强的幂律关系,该研究成果对CO2混相压裂提高采收率技术提供一定的技术支持。

    Abstract:

    To clarify the CO2 miscible fracturing fluid and the mechanism of the reservoir rock, with core LiuZan fault block reservoir as an example, through core displacement, SEM, XRD and CT experiment methods to carry out the CO2 miscible fracturing fluid system (nonflowback acid, CO2 and different additives) in interaction between formation pressure and formation temperature and rock core, rock mineral composition and pore structure before and after the change of permeability. Research has shown that does not return PaiSuan and CO2 and water soluble additives are mixed to form carbonic acid solution with different dissolution of feldspar and the effect of clay minerals, and the preferential dissolution feldspar, after dissolution can generate minerals such as kaolinite and quartz, which nonflowback acid the dissolution of the strongest, followed by CO2 and solvent mixture, CO2 and viscosity agent mixture; The fluid measured permeability and gas measured permeability show the same increasing trend before and after the injection of CO2 miscible fracturing fluid, and the relationship between the increase of liquid measured permeability and gas measured permeability shows a strong power relationship. The results of this study provide certain technical support for the EOR enhancement of CO2 miscible fracturing technology.

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  • 收稿日期:2021-02-24
  • 最后修改日期:2021-04-04
  • 录用日期:2021-05-12
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