高黏稠油生物降黏驱替技术实验研究

摘要

The microbe degradation mechanism is analyzed and the microbe-tlooding is physically simulated within laboratory to effectively reduce heavy-oil viscosity in high-viscosity region,improve development performance and enhance oil recovery.Efficient strains are optimized to determine optimal compounding proportion for biological viscosity reduction by analyzing the strain amount,treatment time and effect.Research demonstrates that QY-1,QY -2 andi QY-3 show favorable viscosity reducing performances and the corresponding viscosity-reducing ratios exceed 65.00％.The viscosity-reducing ratio could reach 73.58％ after compounding the three strains with the proportion of 1 ∶ 1 ∶ 1,which performs better than any single strain.The corresponding growth rate can reach 24.8％ by using the optimal compounding proportion in microbe-flooding.This research is of great significance to sustainable development of high-viscosity oilfields.%为有效降低高黏区稠油黏度,改善开发效果,提高原油采收率,通过对微生物降解机理的分析与研究,在实验条件下模拟了生物驱油技术,筛选出高效菌种,探讨微生物驱油技术的菌种用量、处理时间、处理效果,筛选出适用于微生物降黏菌种的复配比例.实验表明:QY-1、QY-2、QY-3菌种降黏效果较强,降黏率大于65.00％;当菌种按照1∶1∶1的比例进行复配实验时,原油降黏率达到73.58％,降黏效果优于任意单一菌种;按照最优复配比例进行驱替,增产率平均值可达到24.8％.该研究对高黏稠油油田的可持续发展具有重要意义.