微生物采油技术在青海油田的应用

通过室内外大量工作,筛选出3组能够较好地改善试验区原油物性、提高驱油试验驱油效率并适应油藏环境生存的采油菌种对青海油田5口井进行了微生物单井增产处理,这些油井产量低,生产很不稳定,生产过程中出砂和结蜡严重,原油的粘度、比重和凝固点都较高,地层水矿化度高达160 918 mg/L以上,地层温度33℃左右。微生物处理结果表明,油井见效率75%,日均产量增加8.53%到35.72%,油井热洗周期延长2.3倍以上,投入产出比达1∶4.5,微生物强化采油在该地区具有较好的应用前景。

APPLICATION OF MICROBIAL METHOD FOR IMPROV-ING OIL PRODUCTION TO QINGHAI OIL FIELD

Based on lots of laboratory work, three groups of bacteria that can live in reservoir condition were picked to be applied to five wells in Qinghai Oilfield to improve oil production. These bacteria can change the oil’s properties and enhance the oil re-covery in Lab flooding experiment. All the five wells, whichproduced sand and a mass of paraffin precipitated, produced more oil after microbial treatment with average increment by 8.35% through 35.72%. In the same time, the interval of hot oil cycling go beyond 2.3 times, The ratio of cost to return reached 1∶4.5, which indicate the prosperous future of applica-tion of microbial method for improving oil production to Qinghai Oilfield.