摘要
实验聚合物溶液浓度 15 0 0mg/L ,用胜利标准盐水 (矿化度 5 72 5mg/L ,钙镁离子含量 10 8mg/L)配制 ,聚合物为分子量 9.5 6× 10 6,水解度 2 3%的工业品HPAM。聚合物溶液盛于内径 6cm、长 30cm、由不同材料制成的管子内 ,在不同条件下处理 1h和 3h ,测定溶液在实验温度下的粘度 (7s-1)和溶液中Fe3 + 浓度 ,根据测试结果讨论了造成注聚管道中聚合物溶液粘度损失的因素。按聚合物溶液粘度下降程度和溶液中Fe3 + 浓度 ,各测试条件的影响大小排序如下 :普通钢管 >渗氮钢管 >玻璃管 ;70℃ >室温 ;有氧环境 >充氮氛围 ;滚动条件 >静态条件。另外 ,在室温、有氧、、静态条件下 ,聚合物溶液粘度随Fe2 + 加入量增大和时间延长 (1h和 3h)而下降 ,Fe2 + 浓度为 10mg/L时 3h后粘度下降 5 0 %。得出结论 :在注聚管道中聚合物主要发生机械剪切降解和化学降解 ;前者受管壁材料和粗糙度影响 ;壁面钢材受溶解氧腐蚀而产生Fe2 + ,Fe2 + 被氧化成Fe3 + 并引起溶液中聚合物化学降解 ;温度升高时化学降解加剧。表 2参 2。
The 1 500 mg/L polymer solution under study is prepared in a standard brine of Shengli oil fields ( TSD= 5 725 mg/L and Ca 2+ +Mg 2+ 108 mg/L) with a commercial HPAM of M =9.56×10 6 and HD =23%. The solution is treated in a tube of inner diameter 6 cm and length 30 cm under various simulation conditions in 1 h or 3 h and the solution treated is evaluated for viscosity at 7 s -1 and Fe 3+ concentration. On the basis of the data obtained the origin of viscosity loss in injection pipelines is analysed. According to the influencing power in decreasing polymer solution viscosity and in creating Fe 3+ in solution, the treating conditions are arranged in order: in carbon steel tube>in nitriding steel tube>in glass tube; at 70℃>at ambient temperature; in exposure to air oxygen>in nitrogen atmosphere; in 3 h>in 1 h. At ambient temperature in exposure to air oxygen and under static condition the solution viscosity decreases with increasing Fe 2+ amount added and with enlarging treating time from 1 to 3 h and 50% of viscosity is lossed in 3 h with 10 mg/L Fe 2+ added. Following conclusions are made: in injection pipelines polymer in solution undergoes mainly mechanical, shear, and chemical degradation; the former is influence by coarseness of pipe walls; the pipe steel corroded by dissolved oxygen releases Fe 2+ and Fe 2+ is oxidized to Fe 3+ and causes chemical degradation of polymer which is enhanced at elevated temperatures.
出处
《油田化学》
CAS
CSCD
北大核心
2003年第3期247-249,共3页
Oilfield Chemistry
关键词
聚合物
管道
模拟研究
粘度损失
剪切降解
化学降解
亚铁离子
采收率
aqueous polymer solution
viscosity loss
pipelines
shear degradation
chemica degradation
ferrous ion ( Fe 2+ )
