低渗透油藏CO2驱封窜用CO2/N2响应性纳米分散体系的研制
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赖南君(1979—),男,四川仁寿人,教授,博士,从事化学驱提高采收率及驱替液化学方向的研究工作。E-mail:lainanjun@126.com。

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中国石油科技创新基金项目“驱油用CO2/N2智能响应性纳米体系的研制与提高采收率机理研究”(2018D-5007-0207),油气田应用化学四川省重点实验室开放基金“适用于致密油储层纳米压驱体系的构筑及排驱机制研究”(YQKF202010)。


Development of CO2/N2 responsive nano-dispersion system for channeling blocking during CO2 flooding in low-permeability reservoirs
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    摘要:

    针对低渗透油藏CO2驱波及效率低和气窜的问题,合成一种CO2/N2响应性纳米SiO2来控制气窜指进,增加CO2驱的波及范围;利用红外光谱、热重分析等方法对合成的CO2/N2响应性纳米SiO2进行表征研究,在分散条件下对其进行粒径分析、响应性、吸附量、分散稳定性等系统研究,并采用岩心流动装置对CO2/N2响应性纳米SiO2分散体系进行驱油模拟实验,结果表明,CO2/N2响应性纳米SiO2符合预期设计。分散条件下,响应性纳米SiO2平均粒径为58.8 nm,具有CO2/N2响应性,CO2吸附量可达到196.8 mmol/g,有一定的分散稳定性。3 PV的CO2/N2响应性纳米SiO2分散体系在渗透率为5.8 mD的岩心中,封堵率为89.38%,提高采收率为15.15%,最终采收率为53.44%;CO2/N2响应性纳米SiO2分散体系通过去质子化状态下颗粒团聚,封堵地层中的气窜通道,增加低渗流通道的驱油效果。CO2/N2响应性纳米SiO2分散体系不仅可以有效地封堵地层中的气窜通道,而且能提高CO2驱油的波及效率。

    Abstract:

    To address the low CO2 sweep efficiency and gas channeling in low-permeability reservoirs,this paper synthesized the CO2/N2 responsive nano-SiO2 to control gas channeling and fingering and increase the swept range of CO2 flooding.The synthesized responsive nano-SiO2 was characterized by infrared spectroscopy,thermogravimetric analysis,and other methods. Systematic research was conducted on its particle size,responsiveness,adsorption capacity,and dispersion stability under dispersion conditions. Moreover,a core flow device was employed for the simulation experiment of oil displacement in the presence of the CO2/N2 responsive nano-dispersion system. The results show that the CO2/N2 responsive nanoSiO2 meets the expected design. Under the dispersion conditions,the average particle size of the responsive nano-SiO2 is 58.8 nm,which is responsive to CO2/N2. The CO2 adsorption capacity reaches 196.8 mmol/g,which indicates dispersion stability. The 3 PV nano-dispersion system has a blocking rate of 89.38% in a core with permeability of 5.8 mD and realizes enhanced oil recovery(EOR)of 15.15% and ultimate recovery of 53.44%. In the simulated core experiment,the gas channeling channel in the formation is blocked owing to particle agglomeration of the responsive nano-SiO2 dispersion system at the deprotonation state,and thereby the oil displacement effect of the low-permeability channel is increased. In short,the developed CO2/N2 responsive nano-SiO2 dispersion system is capable of both effectively blocking gas channeling channels in formations and enhancing the sweep efficiency of CO2 flooding.

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赖南君,郝丹,朱元强,石伟,唐雷.低渗透油藏CO2驱封窜用CO2/N2响应性纳米分散体系的研制[J].油气地质与采收率,2022,29(2):77~84

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  • 在线发布日期: 2022-06-21
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《油气地质与采收率》
《油气地质与采收率》入选北大《中文核心期刊要目总览》2020年版