石油与天然气化工2026，Vol.55Issue(3)：109-118,10.DOI:10.3969/j.issn.1007-3426.2026.03.012
超长延缓交联体系性能评价及作用机理
Research on performance evaluation and mechanism of an ultra-long delayed crosslinking system
摘要
Abstract
Objective To address the issues of high water cut,high recovery factor,and the difficulty in effectively using of residual oil in remote wellbore zones caused by long-term waterflooding in Bohai Oilfield,an ultra-long delayed crosslinking system was proposed.This system delays the crosslinking reaction time and enhances the deep fluid diversion,thereby expanding the swept volume of profile control and flooding,mobilizing residual oil in remote wellbore zones,and significantly improving waterflooding development efficiency.Method Scanning electron microscopy,a six-speed rotational viscometer,and physical simulation experiments were used to analyze the gel-forming properties,temperature and salt resistance,injectivity and plugging properties of the ultra-long delayed crosslinking system,as well as its effect of enhanced oil recovery.Result The ultra-long delayed crosslinking system began gelling after 15 days at 55 and 65℃,exhibiting a long gelling time that effectively plugged the high permeability channel and used the residual oil in the remote wellbore zone.The gelling time accelerated sharply at 75℃,and the viscosity increased with increasing temperature and salinity.The injection and plugging experiments showed that as the concentrations of polymer and crosslinker increased,the injection pressure gradually increased,reaching a maximum of only 0.09 MPa,indicating good injectivity.The plugging rate remained above 84%,demonstrating good plugging performance.Microscopic oil displacement experiments showed that after injecting the ultra-long delayed crosslinking system,the diversion rate of the high permeability layer decreased significantly,while that of the low permeability layer increased markedly,leading to a substantial improvement in oil recovery.Conclusion The ultra-long delayed crosslinking system can effectively improve waterflooding performance and increase the oil utilization degree of residual oil in remote wellbore zones.The system showed good gel-forming performance and plugging effectiveness in high-temperature and high-salinity environments,making it suitable for long-term plugging requirements under complex reservoir conditions.By optimizing injection parameters,the system can significantly improve waterflooding efficiency.关键词
提高采收率/调剖/超长延缓交联体系/成胶性能/耐温耐盐性Key words
enhanced oil recovery/profile control/ultra-long delayed crosslinking system/gelling performance/temperature and salt resistance引用本文复制引用
张云宝,吴潇洋,葛嵩,曲萧萧,王劲草,韩瑞林..超长延缓交联体系性能评价及作用机理[J].石油与天然气化工,2026,55(3):109-118,10.基金项目
国家自然科学基金"润湿性可逆的低碳纳米颗粒改性设计及自适应页岩油藏的工作机制研究"(52574039) （52574039）
海南省重点研发专项"揭榜挂帅""南海在生产油气田大幅度提高采收率关键技术研究与示范"(ZDYF2024GXJS263) （ZDYF2024GXJS263）
