微膨胀堵漏体系的构建及性能评价  

Construction and Performance Evaluation of Micro-Expansion Plugging System

作　　者：岳云龙 薛丹[1] 梅明佳 侯寅 YUE Yunlong;XUE Dan;MEI Mingjia;HOU Yin(School of Chemistry and Chemical Engineering,Xi'an Shiyou University,Xi'an 710065,China;CCDC Changqing Well Cementing Company,Xi'an 710000,China)

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]中国石油集团川庆钻探工程公司长庆固井公司,陕西西安710000

出　　处：《化工技术与开发》2025年第4期49-53,共5页Technology & Development of Chemical Industry

摘　　要：针对在深井的长裸眼固井过程中,水泥浆在大裂缝中难以封堵的情况,本文将膨胀堵漏颗粒(EPS)与纤维类堵漏材料进行复配,构建了一种微膨胀堵漏水泥浆体系。该体系在1~3mm内可实现有效封堵,承压能力在5MPa以上,堵漏性能优异。采用幂律模式评价了体系的流变性能,该体系的稠度系数由常规密度水泥浆体系的0.632 Pa·S^(n) 增加至2.981Pa·S^(n),稠化性能以及养护24h、48h的力学强度,均在可施工范围内。堵漏机理研究发现,在温度的激发下,膨胀堵漏颗粒(EPS)实现了膨胀,并可挤压于孔隙及裂缝中,减缓水泥浆的漏失,之后纤维在地层裂缝中实现架桥并形成网状结构,可在大裂缝中实现有效封堵。膨胀堵漏颗粒与纤维的协同作用在地层裂缝中起到了防漏堵漏的作用,可为固井深井的防漏堵漏技术提供新的思路。In the process of cementing deep wells with long open holes,the challenge of sealing cement slurry in large fractures has been addressed.A micro-expansion sealing cement slurry system was developed by incorporating expansion sealing particles (EPS)with fiber-based sealing materials.This system effectively seals fractures ranging from 1~3 mm and achieves a compressive strength exceeding 5MPa,demonstrating excellent sealing performance.The rheological properties were evaluated by a power-law model,revealing that the consistency coefficient of this system increased from 0.632Pa·S^(n) to 2.981Pa·S^(n) compared to conventional density cement slurry systems.The thickening performance and the mechanical strengths after 24h and 48h of curing were within the acceptable range for field application.Mechanistic studies revealed that the expansion sealing particles (EPS) expand under temperature activation,allowing them to penetrate pores and fractures,thereby reducing cement slurry loss.Subsequently,the fibers form a bridging network structure within the fractures,enabling effective sealing of large fractures.The synergistic interaction between the expansion sealing particles and fibers plays a critical role in preventing leakage within formation fractures.This study provides novel insights into leakage prevention and sealing technologies for deep well cementing applications.

关 键 词：固井技术 防漏堵漏 微膨胀 水泥浆 

分 类 号：TE256.6[石油与天然气工程—油气井工程]