海上纳滤水处理技术研究与应用
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摘要
海水作为海上油田常用注水水源因存在大量成垢离子易导致后期结垢。通过静态配伍性试验、动态配伍性试验及岩心配伍性试验,考察了纳滤海水与RX-1油田地层水的配伍性。试验结果表明:纳滤海水与地层水混合后几乎无沉淀,岩心驱替100 PV,渗透率下降20%以内。矿场试验结果表明:海水经纳滤处理后,水质稳定,Ca~(2+)由366 mg/L降到平均19 mg/L,Ca~(2+)去除率为94%;SO_4~(2-)由2 690 mg/L降到平均4 mg/L,SO_4~(2-)去除率为99%。纳滤装置1 a的应用结果表明:注入端压力平稳,未出现结垢问题。
Seawater as a common injection water source in offshore oil fields is apt to lead to scaling in later stage,due to the presence of a large number of scale-forming ions. The compatibility of nanofiltration seawater and the formation water of RX-1 oilfield has been investigated by the static compatibility test,dynamic compatibility test and rock core compatibility test. The experimental results show that after the nano-filtrated seawater and formation water have been mixed,there is almost no precipitation,and the core displacement 100 PV,the permeability is decreased by less than 20%. The field test results show that after the seawater has been treated by nanofiltration,the water quality is stable. The concentration of Ca~(2+)is decreased from 366 mg/L to 19 mg/L averagely,Ca~(2+)removing rate is 94%.The concentration of SO_4~(2-)is decreased from 2 690 mg/L to 4 mg/L averagely,SO_4~(2-)removing rate is 99%. The application result of nano device in one year shows that the pressure at the injection end is stable and no scaling problem occurs.
Seawater as a common injection water source in offshore oil fields is apt to lead to scaling in later stage,due to the presence of a large number of scale-forming ions. The compatibility of nanofiltration seawater and the formation water of RX-1 oilfield has been investigated by the static compatibility test,dynamic compatibility test and rock core compatibility test. The experimental results show that after the nano-filtrated seawater and formation water have been mixed,there is almost no precipitation,and the core displacement 100 PV,the permeability is decreased by less than 20%. The field test results show that after the seawater has been treated by nanofiltration,the water quality is stable. The concentration of Ca~(2+)is decreased from 366 mg/L to 19 mg/L averagely,Ca~(2+)removing rate is 94%.The concentration of SO_4~(2-)is decreased from 2 690 mg/L to 4 mg/L averagely,SO_4~(2-)removing rate is 99%. The application result of nano device in one year shows that the pressure at the injection end is stable and no scaling problem occurs.
引文
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[3]陈士佳,吴晓燕,左清泉,等.软化海水与海上绥中36-1油田储层配伍性研究[J].工业水处理,2014,34(2):69-70.
[4]潘献辉,赵亮.反渗透海水淡化膜法预处理技术研究进展[J].工业水处理,2007,27(6):12-13.
[5]查吕应,丁志斌,曹传新.纳滤技术用于反渗透海水淡化预处理评述[J].工业用水与废水,2003,34(2):18-19.
[6]温彩哨,余志晟,刘新春,等.煤层气产出水水质特征及处理技术研究进展[J].工业水处理,2014,34(10):1-2.
[7]姜伟,范代娣,屈撑囤,等.稠油采出水纳滤脱盐技术与研究[J].环境工程,2016, 34(增刊):72-74.
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