胜利油田微生物吞吐体系的性能评价及应用

Performance Evaluation and Application of Microbial Huff and Puff System for Shengli Oilfield

曹功泽 李彩风 陈琼瑶 刘涛 汪卫东 汪庐山 孙刚正

CAO Gongze LI Caifeng CHEN Qiongyao LIU Tao WANG Weidong WANG Lushan SUN Gangzheng

胜利油田罗9 试1 区块存在温度高、黏度高、含水高、水驱效率低等问题。为了进一步提升高含水油井的产 油量，研制了微生物多糖和微生物发酵液复合吞吐体系，对其耐温性、封堵性、乳化降黏作用及驱油性能进行了 研究，并在罗9 试1 区块进行了现场应用。结果表明，在55～95 ℃的条件下，新型微生物多糖的黏度始终保持在 120～125 mPa·s 之间，耐温性较强。将新型微生物多糖注入岩心后，压力升高，渗透率降低53.3%，可以有效封堵 岩心。微生物发酵液由主要成分为鼠李糖脂生物表面活性剂的发酵液Ⅰ和主要成分为糖-蛋白-脂生物乳化剂 的发酵液Ⅱ组成。当Ⅰ和Ⅱ的体积比为1∶2 时，发酵液的高温乳化能力最强，对原油的乳化降黏率达81.4%。 微生物多糖和微生物发酵液复合体系的驱油效果较好，可提高驱油效率13.9 百分点，优于单一体系的驱油效 果。现场单井吞吐应用中，4 口油井降水增油效果显著，累计增油达2730 t，有效改善了罗9 试1 区块油井的低 效生产状况。

There are some problems of high temperature，high viscosity，high water cut and low water flooding efficiency in Luo 9 Shi 1 block. In order to improve the output of high water-cut oil well，the composite system of microbial polysaccharide and microbial fermentation broth was developed. Its temperature resistance，plugging performance，emulsion viscosity reduction and oil displacement efficiency were studied. Finally，the composite system was applied on this block. The results showed that the viscosity of new microbial polysaccharide remained in the range of 120—125 mPa·s all the time from 55 ℃ to 95 ℃，indicating strong temperature resistance. When the new microbial polysaccharide was injected into the core，the pressure increased while the permeability decreased by 53.3%. It could effectively seal the core. The microbial fermentation broth was composed of fermentation broth I mainly contained rhamnolipid biosurfactant and fermentation broth II mainly contained sugar-protein-lipid biological emulsifier. When the volume ratio of Ⅰ to Ⅱ was 1∶2，the emulsification ability at high temperature of microbial fermentation broth was the strongest. The rate of emulsification viscosity reduction to oil was 81.4%. The physical simulation of oil displacement experiment showed that the composite system of microbial polysaccharide and microbial fermentation broth had improved oil recovery by 13.9 percentage points，which was better than that of single system. The application results of single well huff-and-puff showed that four oil wells had the significant effect of increasing oil and dewatering with the cumulative oil increase of 2730 t. It effectively improved the low efficiency of oil well in Luo 9 Shi 1 block.

10.19346/j.cnki.1000-4092.2022.03.019