冀东油田微生物驱油技术室内研究

在对冀东油田高浅北和老爷庙区块油藏状况、原油物理性质、产出水化学性质和细菌群落组成分析的基础上,通过物理模拟驱油实验来研究这2个区块实施微生物驱油技术的潜力.利用最大或然数法、倾注平板法和滚管法对产出水中的细菌群落状况进行了分析.结果表明,产出水中细菌群落较为单一,硫酸盐还原菌为优势菌群,部分油井产出水中含有好氧腐生菌,说明这2个区块具备微生物生长繁殖的条件.室内物理模拟驱油实验表明,在一次水驱的基础上,经过7周期85 d培养驱替,高浅北和老爷庙区块模型的采收率分别提高15.6%和10.7%.综合微生物学、油藏条件以及物理模拟驱油实验的研究结果,在冀东油田高浅北和老爷庙区块实施微生物驱油技术是可行的.

Laboratory study on enhancing recovery factor by microbial oil displacement in Jidong Oilfield

The potential of enhancing recovery factor by microbial oil displacement in 2 blocks of Gaoqianbei and Laoyemiao in Jidong Oilfield is studied by physical simulation experiments on the basis of the analyses of the conditions of the reservoir,the physical property of crude oil and the chemical property and the bacterial composition of produced water.The composition of bacterial communities in the formation water is determined by most probable number method,pour plate method and roll-tube technique.The results show that sulfate reducing bacteria are dominant species in all the formation water,aerobic saprophytic bacteria present in a part of formation water.It is indicated that bacteria could grow and reproduce in these 2 blocks.Core flooding experiments show that based on water flooding,the recovery factors of Gaoqianbei and Laoyemiao blocks are enhanced by 15.6% and 10.7% separately through 7 treatments in 85 days.So it is possible to enhance the recovery factors of these 2 blocks by microbial oil displacement.