胜利油田稠油用微乳液型驱油剂研制

Preparation of micro-emulsion used as heavy oil displacement agent in Shengli Oilfield

关键词:  微乳液  稠油  驱油剂  相图 

Key words:  micro-emulsion  heavy oil  displacement agent  phase diagram

摘要:

采用三元相图研究了助表面活性剂种类、温度、盐含量和水油比对微乳液型驱油剂制备的影响。结果 表明:在一定的范围内,助表面活性剂链长增加可以得到更大面积的微乳液区域；制备温度和NaCl质量分数的提高,均可降低制备微乳液所需最低助表面活性剂质量分数(w_min),助表面活性剂的分子结构也带来w_min的显著变化；通过调控助表面活性剂用量,在水油比(8∶2)~(5∶5)范围均可得到微乳液。采用黏度实验和驱油实验评价了微乳液型驱油剂的性能,结果表明,微乳液质量分数1%时,对单家寺稠油和孤岛稠油的降黏率达到90%以上,降黏效果较好；加入质量分数为2%的微乳液驱油剂可提高稠油热采采收率10%以上。 

Abstract:

The effects of promoter, temperature, salt content and water-oil radio on micro-emulsion used as heavy oil displacement agent was studied with ternary phase diagram. The results showed that the area of micro-emulsion was increased with the increase of chain length of promoter; the w_min(promoter mass fraction) decreased with the increase of temperature and the concentration of NaCl; the molecular structure of the promoter had significant influence on w_min; micro-emulsion which was obtained with the water/oil ratio from 8/2 to 5/5. The properties of micro-emulsion were studied by viscosity and displacement experiments. The results showed that for Shanjiasi and Gudao heavy oil, the viscosity reduction rate of heavy oil was above 90% when the concentration of micro-emulsion was 1%; heavy oil thermal recovery was enhanced above 10% when the concentration of micro-emulsion was 2%.