摘要
针对南海西部涠洲RRX油田低渗储层修井漏失造成水敏、水锁伤害的问题,通过单因素实验分析及药剂协同复配,研发了一套自降解暂堵液体系。室内实验结果表明,该体系流变性能优异,滤失量低,无需替入破胶液,6 d自降解率超过50%;气-液表面张力低于20 mN/m,防膨率超过95%,岩心模拟实验渗透率平均恢复值为90%。在现场应用过程中,零漏失,零污染,可解决低渗储层修井过程中的储层保护难题。
A self-degrading temporary plugging fluid was developed,through one-factor experiment analysis and synergistic compounding of different additives,to address the water sensitive and water block issues resulted from mud losses during working over the low permeability reservoirs in the Weizhou RRX oilfield in the west of South China Sea.Laboratory experimental results showed that the drilling fluid developed has excellent rheology and low filtration rate.Without injecting gel breaker,50%of the gels developed in the drilling fluid were degraded in 6 days.Surface tension of the drilling fluid filtrate is less than 20 mN/m.The inhibitive capacity of the drilling fluid is at least 95%.Core experiment with the drilling fluid showed that the average percent permeability recovery is 90%.No mud loss and contamination to reservoir were found in field application of the drilling fluid,demonstrating the ability of the drilling fluid to minimize damage to low permeability reservoirs during workover operation.
作者
宋吉锋
梁玉凯
周玉霞
程利民
贾辉
SONG Jifeng;LIANG Yukai;ZHOU Yuxia;CHENG Liming;JIA Hui(CNOOC Zhanjiang Branch Company,Zhanjiang,Guangdong 524057)
出处
《钻井液与完井液》
CAS
北大核心
2018年第4期73-76,共4页
Drilling Fluid & Completion Fluid
基金
"十三五"国家科技重大专项课题"南海西部海域低渗油藏勘探开发关键技术"(2016ZX05024-006)部分研究成果
关键词
低渗储层
水锁
水敏
储层保护
自降解
Low permeability reservoir
Water block
Water sensitive
Reservoir protection
Self degrading
