摘要
南海西部油田注水开发中富含SO_4^(2-)的海水与含有Ba^(2+)、Sr^(2+)的地层水不配伍,导致近井地带硫酸钡锶垢结垢现象严重。根据防垢剂挤注技术的具体要求,进行了钡锶防垢剂配伍性实验、静态防垢率实验、热稳定性能实验以及岩心动态吸附/解吸附实验,对四种主要成分为HEDP与PESA的复合防垢剂进行评价,结果表明:在120℃下,防垢剂HYZ-101通过调节pH值之后配伍性较好;当质量浓度≥5 mg/L时,其静态防垢率>90%;在120℃下热处理30 d后,防垢率下降幅度很小,防垢率仍>90%;动态吸附/解吸附实验表明,低pH下防垢剂的吸附/解吸附性能较高pH下更好。因此优选出防垢剂HYZ-101来解决南海西部油田结垢问题。
In the process of water injection development of western of the south China sea oilfield, the serious barium/strontium sulfate scales have occurred in the oil wells in the middle block of the oilfield, due to the incompatibility between injected sea water with rich SO2-4 and formation water with rich Ba2＋ and Sr2＋. The experiment was conducted for four kinds of organic phosphonate scale inhibitors in terms of chemical compatibility of barium strontium sulfate scale inhibitors, static inhibition efficiency, stability and dynamic adsorption/desorption of the scale inhibitors required for squeeze treatment. The experimental results showed that： by adjusting the pH chemical compatibility of HYZ-101 scale inhibitor was better at 120 ℃; when concentration ≥5 mg/L, static inhibition efficiency〉90%;under the 120 ℃ heat treatment after 30 d, the drop of inhibition efficiency is very small, still 〉 90%; the results of core flood experiment showed that at low pH the adsorption/desorption performance of scale inhibitor was better than at high pH. The reasonable scale inhibitor HYZ-101 was selected to solve the problem of the western of the south China sea oilfield.
出处
《科学技术与工程》
北大核心
2017年第18期198-202,共5页
Science Technology and Engineering
基金
国家自然科学基金(51574266)
中国石油化工有限公司项目(P15029)资助
关键词
防垢率
硫酸钡锶垢
防垢剂
井下结垢
涠洲12-1油田
inhibition efficiency
barium strontium sulfate scale
scale inhibitors
downhole scaling Weizhou12-1 oilfield
