中一区Ng3区块微生物驱油物模实验研究

Laboratory Study on Enhancing Recovery by Microbial Oil Displacement in ZHONGYIQU Ng3

为进一步了解微生物驱油的效果,在对中一区Ng3油藏状况、原油物性以及水质状况实验分析的基础上,确定了实施微生物驱油的可行性依据.并利用岩心管模拟地层压力和温度进行微生物驱油的实验研究,同时改变不同的营养条件和菌种组合,确定了最佳的驱油条件.结果表明:在一次水驱的基础上,经过培养多轮次驱替后产表面活性剂菌可以提高采收率3.7%,产聚合物菌可以提高采收率3.9%,而对于混合菌培养驱替后最大可以提高采收率6%以上.综合实验证明所用菌株可以作为现场微生物驱油的备选菌株,而且油藏的内源菌测试表明没有对实验菌株产生明显的抑制作用.

In order to study the effect of microbial enhanced oil recovery （MEOR）, the feasibility of microbial oil displacement was affirmed on the basis of analyses of the conditions of reservoir, physical property of crude oil and chemical property of produced water. Meanwhile physical simulation experiment was performed under the pressure and temperature of the stratum, with the condition of nutrition and strain combination adjusted for best efficiency. The results showed that after several treatments cultured and then flooded, oil recovery was enhanced 3.7% by surfactant-producing bacteria, 3.9% by polymer-producing bacteria, and 6% by the mixed bacteria. Moreover, the bacteria were not restrained by the indigenous bacteria in oil. These results indicated that the bacteria could be applied for oil recovery in the field test. Fig 9, Tab 7, Ref 27