纳米驱油剂相渗特征及对页岩油开发方式的影响  

Relative permeability characteristic of nano-oil displacement agent andits effect on the development of shale oil

作　　者：许宁[1] 谷团[1] 陈哲伟 郭小超[1] 郭秀文[1] 蒋美忠[1] 战常武[1] XU Ning;GU Tuan;CHEN Zhewei;GUO Xiaochao;GUO Xiuwen;JIANG Meizhong;ZHAN Changwu(Research Institute of Petroleum Exploration Development,PetroChina Liaohe Oilfield Company,Liaoning Panjin 124010,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100007,China)

机构地区：[1]中国石油辽河油田公司勘探开发研究院,辽宁盘锦124010 [2]中国石油勘探开发研究院,北京100007

出　　处：《非常规油气》2024年第3期84-90,共7页Unconventional Oil & Gas

基　　金：中国石油天然气股份有限公司科技专项“超低渗油藏驱渗结合提高采收率关键技术研究”(2021DJ1304)。

摘　　要：纳米技术在非常规油气开发中应用前景广泛,有望成为新一代颠覆性开发技术。相渗作为驱替和渗吸的重要渗流特征需要加以研究。对页岩油岩心开展纳米剂、表面活性剂等不同驱渗介质相渗等实验,并进行拟合分析,可以发现:1)纳米剂的油相相对渗透特征指数n值显著降低,有利于提高油水流度,降低注入压力;2)低浓度纳米剂水相端点相对渗透率高于地层水,反映低浓度纳米剂水溶液流动性更强;3)纳米驱油剂相渗的两相区较油水相渗增加8.8%,幅度小,需要改进开发方式以进一步提高驱油效率;4)纳米剂通过驱替与渗吸相结合可以将驱油效率从36.67%大幅度提高到74.67%;5)周期驱替还能进一步改善开发效果,驱油效率比连续驱替提高14.1%(注入体积倍数0.478 PV)。该研究成果对页岩油补能、稳产、提采的开发方式优选具有重要指导意义。Nanotechnology has a wide application prospect in unconventional oil and gas development and is expected to become a new generation of disruptive development technology.The relative permeability needs to be studied as a vital flow characteristic of displacement and imbibition.The relative permeability experiments with shale core were conducted for different flooding media,including nano-agent,surfactant,etc.The results show that:1)The characteristic n value of nano-oil displacement agent decreased significantly,which is beneficial to improve oil-water fluidity and reduce injection pressure;2)The relative permeability of the endpoint of water phase with low concentration nano-agent is significantly higher than that of formation water,the flowability of aqueous solution with low concentration nano-agent is stronger;3)The two-phase area of the nano-oil displacement agent is 8.8%more than that of oil-water,and the range is small,so it is important to improve the development mode to improve the displacement efficiency further;4)The displacement efficiency can be significantly increased from 36.67%to 74.67%by the combination of displacement and imbibition;5)The development effect can be further improved by cycle displacement,and the displacement efficiency is 14.1%higher than continuous displacement(injection volume multiple 0.478 PV).The research result is important for development mode optimization to supplement energy,oil production stability,and enhanced oil recovery of shale oil reservoirs.

关 键 词：纳米剂 相渗 页岩油 驱替 周期 

分 类 号：TE349[石油与天然气工程—油气田开发工程]