大庆石油地质与开发2024，Vol.43Issue(6)：148-154,7.DOI:10.19597/J.ISSN.1000-3754.202305026
非常规油藏纳米剂驱二次采油潜力实验
Experiment on secondary recovery potential of nano-agent flooding in unconventional reservoir
摘要
Abstract
In order to deal with challenge of continuously supplying energy,reducing production decline rate and enhancing oil recovery after energy storage volumetric fracturing development,on the basis of nano displacement agent screening,a series of experiments of multi-media imbibition,mode succession and cyclic displacement are carried out to determine the variation characteristics of displacement efficiency by nano-agent imbibition and sec-ondary recovery mode and potential of subsequent development to enhance recovery.Imbibition experiment shows variation characteristics of 4 imbibition displacement stages of nano-agent imbibition efficiency,including empty window stage,ultra-high speed stage,high speed stage and low speed stage,contributing to determining rational soaking time based on imbibition mechanism.Subsequent displacement experiment shows still much potential after imbibition,with displacement efficiency of nano-agent with mass volume fraction of 0.02%close to that of imbibi-tion stage.The total displacement efficiency of imbibition displacement reaches 74.67%,and residual oil saturation is decreased by 7.43%of water flooding.Cyclic displacement can promote nano-agent imbibition to displace remain-ing oil in micro-nano-pore throats,and increase microscopic swept volume,with displacement efficiency increased by 14.1 percentage points of continuous displacement(injecting 0.478 PV).Therefore,it is an important direction of secondary recovery to convert to nano-agent cyclic displacement after energy storage volume fracturing of horizon-tal well.关键词
非常规油藏/二次采油/周期驱替/纳米剂/渗吸Key words
unconventional reservoir/secondary recovery/cyclic displacement/nano-agent/imbibition分类
能源科技引用本文复制引用
许宁,于天忠,谷团,陈哲伟..非常规油藏纳米剂驱二次采油潜力实验[J].大庆石油地质与开发,2024,43(6):148-154,7.基金项目
中国石油天然气股份有限公司重大科技专项"超低渗油藏驱渗结合提高采收率关键技术研究"(2021DJ1304). （2021DJ1304）
