石油与天然气化工2025，Vol.54Issue(2)：107-112,6.DOI:10.3969/j.issn.1007-3426.2025.02.015
低渗高盐油藏段塞表面活性剂组合调驱研究
Research on the combination of slug surfactants for profile control and flooding in low-permeability and high-salt reservoirs
摘要
Abstract
Objective The use of present surfactants for flooding in low-permeability and high-salt reservoirs in Yanchang Oilfield cannot increase the swept volume,but only improve the oil washing efficiency,resulting in low utilization of crude oil in low permeability areas and limited improvement in oil recovery.Therefore,it is necessary to carry out research on the technology of profile control and flooding in low-permeability and high-salt reservoirs.Method Based on the capillary bundle theory,a low viscosity and ultra-low interfacial tension surfactant(OBU-3)system was developed as a large plug for oil displacement,and combined with a high viscosity and ultra-low interfacial tension surfactant(ACS-2)system formed by self-assembling counterions as a small plug for oil displacement control to form a multi-stage plug,achieving deep profile control and flooding.Result The injection mass fractions of the large and small plugs were 0.5 wt%and 2.7 wt%,respectively.After 10 adsorption cycles,the interfacial tension reached an ultra-low value,demonstrating good resistance to adsorption loss.The emulsifying and wetting properties of OBU-3 were good,which was conducive to improving the efficiency of oil washing,while ACS-2 had good rheological property,viscoelasticity,and viscosity-temperature property,which were conducive to expanding the swept volume and adjusting the liquid absorption profile.The combination of multi-segment plug surfactants(0.1 PV small segment plug flooding+0.2 PV large segment plug flooding+subsequent water flooding)had a good oil recovery effect,with an average increase of 14.8 percentage points,which was twice as much as using only large segment plug flooding,and had the oil flooding effect of polymer/surface secondary flooding.Conclusion The combination of multi-stage plug surfactants profile control and flooding can effectively reduce ineffective water circulation,improve sweep efficiency,and not contain strong or weak alkalies,avoiding corrosion and scaling.It can significantly improve economic benefits and provide guidance for improving oil recovery in low-permeability and high-salt reservoirs.关键词
低渗高盐油藏/多段塞/表面活性剂驱/组合调驱/超低界面张力/黏弹性Key words
low-permeability and high-salt reservoirs/multi-stage slug/surfactant flooding/combined profile control and flooding/ultra-low interfacial tension/viscoelasticity引用本文复制引用
杨永钊,张雪莹,周昱君,周明,郭肖,马江波..低渗高盐油藏段塞表面活性剂组合调驱研究[J].石油与天然气化工,2025,54(2):107-112,6.基金项目
国家重点研发计划项目"CO2驱油技术及地质封存安全监测"(2020-610624-07-03-042345) （2020-610624-07-03-042345）
国家自然科学基金"特高温高盐油藏驱油用TTSS系列表面活性剂的开发"(51074133) （51074133）
国家自然科学基金项目"超深层页岩气藏两亲性碳基纳米粒子强化超临界CO2微泡沫压裂液及其携砂机理研究"(52474045) （52474045）
四川省自然基金重点项目"超深层页岩气藏两亲性石墨烯强化超临界CO2微泡沫压裂液及其稳泡机理"(2023NSFSC0027) （2023NSFSC0027）
