摘要
不同类型和浓度的表面活性剂和碱与稠油形成的乳状液的稳定性不同。为减轻无机碱引发的结垢等问题,引入有机碱与之组成复合碱体系。优选出胜利石油磺酸盐(SLPS)和Na2CO3-三乙胺(TEA)作为实验用表面活性剂和碱,并将二者组成表面活性剂-复合碱复配体系。分别考察了SLPS浓度、复合碱总量和复合碱中Na2CO3与TEA的配比对乳状液稳定性的影响,实验结果为当SLPS浓度为0.6%、复合碱总量为0.8%、Na2CO3:TEA=1:1时,复配体系与稠油形成的乳状液最稳定,60℃下3h的脱水率为18%。实验评价了复配体系对无机盐、温度和不同黏度稠油的适应性,结果表明,低浓度的NaCl可与复配体系起协同作用,增强乳状液的稳定性,CaCl2和MgCl2存在时可大幅降低乳状液的稳定性,稠油的黏度越低乳状液越稳定。并认为有机碱是今后油田化学驱油用碱的研究方向之一。
Stability of emulsion is different when they are prepared by different surfactants and alkali.Organic alkali was added to make up compounded alkali system with inorganic alkali in order to alleviate scaling caused by inorganic alkali.Shengli petroleum sulfonate(SLPS)and sodium carbonate-triethylamine(TEA)were selected as experimental surfactant and alkali,and a compounded system was made up by these chemical agents.Some factors such as concentration of SLPS,bulk concentration of compounded alkalis,match of sodium carbonate and TEA which could affect the stability of emulsions were investigated.The results showed that stability of emulsions which were prepared by compounded system and heavy oil was most steady when concentration of SLPS was 0.6%,bulk concentration of compounded alkalis was 0.8%,match of sodium carbonate and TEA was 1.The dehydration rate was 18% under 60℃ and 3 h conditions.Adaptability of compounded system with inorganic salt,temperature and different viscosity heavy oil was evaluated.The results show that NaCl can generate synergistic effect with compounded system when its concentration is low,and stability of emulsion is enhanced.Stability of emulsion is declined sharply when obtain CaCl2 and MgCl2.Stability of emulsion ascends when viscosity of heavy oil decreases.It's also held that organic alkali would be one of the research directions of chemical flooding agents in oilfield.
出处
《钻采工艺》
CAS
北大核心
2012年第5期90-93,12-13,共4页
Drilling & Production Technology
基金
国家科技重大专项“大型油气田及煤层气开发”(编号:2011ZX05002-005)
关键词
石油磺酸盐
复合碱
有机碱
乳状液
稳定性
脱水率
适应性
petroleum sulfonate,compounded alkali,organic alkali,emulsion,stability,dehydration rate,adaptability
