表面活性剂化学性能分析及提高致密油田采收率实验研究
Experimental Study on Improving Recovery Rate of Tight Sandstone Reservoirs with Surfactants
王金月 1李昱 2黄超 3李莎 4余敬焱 4王小雨 5罗鑫6
作者信息
- 1. 青海油田分公司采油三厂,青海 茫崖 816499
- 2. 青海油田分公司采油五厂,青海 茫崖 816499
- 3. 青海油田诚信服务公司,青海 茫崖 816499
- 4. 青海油田分公司采油一厂,青海 茫崖 816499
- 5. 中国石油玉门油田分公司老君庙采油厂,甘肃 玉门 735200
- 6. 青海油田分公司采油二厂,青海 茫崖 816499
- 折叠
摘要
自制了一种适用于致密砂岩油藏驱采的表面活性剂FDP,利用X射线衍射仪、扫描电镜及界面张力仪等手段分析了目标油藏的储层特性,测试了FDP对岩石界面张力与润湿性的影响特性,利用岩心驱替实验装置评价了表面活性剂FDP与SDS溶液驱油时静态吸附与动态吸附特性,对比分析了其在渗吸采收率方面的效用.结果表明:表面活性剂FDP在多孔介质中可有效通过改变岩石润湿性、降低油水界面张力及乳化作用实现驱油效果.目标区块油藏孔隙类型主要为长石溶孔,其间连通性差,整体表现为弱亲水性.0.02%FDP体系,其油水界面张力仅为2.33 mN·m-1,三相接触角低于30°,其在静态渗吸与动态渗吸中的渗吸采收率均显著高于SDS体系,可有效提高致密砂岩油藏采收率.
Abstract
A self-made surfactant FDP suitable for tight sandstone reservoir recovery was prepared.The reservoir characteristics of the target reservoir were analyzed using X-ray diffraction,scanning electron microscopy,and interfacial tension meters.The influence of FDP on rock interfacial tension and wettability was tested,and the static and dynamic adsorption characteristics of surfactant FDP and SDS solution during oil recovery were evaluated using a rock core displacement experimental device,a comparative analysis was conducted on its effectiveness in terms of infiltration and extraction yield.The results showed that the surfactant FDP could effectively achieve oil displacement effect in porous media by changing rock wettability,reducing oil-water interfacial tension,and emulsifying effect.The main pore type of the target block oil reservoir is feldspar dissolution pores,with poor connectivity and overall weak hydrophilicity.The 0.02%FDP system had an oil-water interfacial tension of only 2.33 mN·m-1 and a three-phase contact angle of less than 30°.Its recovery rate in static and dynamic infiltration was significantly higher than that of the SDS system,which could effectively improve the recovery rate of tight sandstone reservoirs.
关键词
致密砂岩/表面活性剂/界面张力/采收率Key words
Dense sandstone/Surfactants/Interface tension/Recovery ratio引用本文复制引用
基金项目
国家自然科学基金青年基金项目(21705122)
出版年
2024
NETL
NSTL
万方数据