一种新型硫酸亚铁单液法调剖剂  

^^FERROUS SULFATE/UREA AQUEOUS SYSTEM:AN IMPROVED PRECIPITATING PROFILE MONDIFICATOR FOR SINGLE-LIQUID PROCESS

作　　者：廖久明[1] 侯士法[1] 潘哲明 

机构地区：[1]承德石油高等专科学校化工系

出　　处：《油田化学》1995年第4期372-374,共3页Oilfield Chemistry

摘　　要：本文提出用尿素作为ｐＨ调节剂．加快硫酸亚铁单液法调剖剂中亚铁离子在地层温度下的沉淀，增大沉淀率，提高封堵效能。岩芯流动试验结果表明，１５％ＦｅＳＯ＿４·７Ｈ＿２Ｏ／５％尿素调剖剂体系的封堵能力比不含尿素的体系增大近一倍。The pH values of urea and urtropin aqueous solutions increase at elevated temperatures and this property of urea isapplied to improve the plugging efficiency of ferrous sulfate aqueous system as precipitating profile modificator.InFeSO_4furea mixed systems the percentage of Fe￣(2+)precipitated as Fe(OH)_2 increases the concentration of urea and is notably higher than that in with plain FeSO_4 system. For a 15%FeSO_4·7H_2O/5%urea system.the plugging efficiencies determined in core flow tests at 150℃ and 200℃ are by 90.7% and 92.6% higher in comparison with 15% FeSO_4·7H_2O system.

关 键 词：调剖剂 硫酸亚铁 尿素调剖剂 采油井 井下作业 

分 类 号：TE358[石油与天然气工程—油气田开发工程]