新型激活剂提高内源微生物驱油效果研究及应用

Research and application of the new activator to improve the effect of MEOR

关键词:  内源微生物驱  激活体系  生物生长因子  乳化降黏

Key words:  endogenous microbial stimulation  activator system  microbial promoting factor  emulsification and viscosity-reduction

摘要:

为了提高内源微生物驱油效果,引入微生物生长促进因子,形成一种新型激活剂体系。当新型激活剂体系中微生物生长促进因子RPOS-12质量分数为0.05%时,激活后内源微生物数量大于8.8×10⁸ 个/mL,同时提高了两种功能菌的含量,即乳化菌由10⁴ 个/mL提高至10⁶个/mL、产脂肽菌由10³ 个/mL提高至10⁴ 个/mL。该体系激活后对柴油乳化指数达到100%、原油降黏率达到95.79%,洗油效率达到95.07%,一维物模实验提高水驱稠油采收率17.7%。现场试验表明,试验区单井产油量由4.3 t/d升至8.1 t/d,含水率从95%下降到86.5%,6个月4口井累增油量1 639 t。

Abstract:

In order to improve the effect of microbial enhanced oil recovery(MEOR), a new activator was designed by introducing a microbial promoting factor. Through adding 0.05% microbial promoting factor RPOS-12 into activator system,bacteria number increased greatly to more than 8.8×10⁸ cells/mL. Two emulsifying bacteria among them increased significantly,the geobacillus increased from 10⁴ cells/mL to 10⁶ cells/mL and the lipopeptide-producing bacteria increased from 10³ cells/mL to 10⁴ cells/mL. The experiment showed that the emulsification index of diesel reached 100%, the rate of oil viscosity reduction was 95.79%, and the oil displacement efficiency was 95.07%. Physical model test showed that the oil recovery rate increased by 17.7% in reservoir conditions. The field test showed that the test single well oil production increased from 4.3 t/d to 8.1 t/d, the water content decreased from 95% to 86.5%, the incremental oil production of the 4 wells was 1 639 t during the new activator injected for 6 months.