中文摘要：

微生物与空气协同驱油是一种新的驱油方法,其主要机理为利用空气中的氧气提高微生物生长代谢速率,同时微生物耗氧使空气驱变得更为安全.通过实验研究不同初始溶氧浓度下实验菌种的生长规律和耗氧规律,及溶氧浓度对微生物脱油效率的影响.结果表明：在增氧与未增氧的条件下,实验菌种生长均存在停滞期、对数生长期、稳定期和衰退期,初始溶氧浓度为4.5和5.5 mg/L时,微生物生长的最大浓度是未增氧时的3倍以上;对数生长期溶氧浓度呈对数降低趋势,稳定期和衰退期溶氧浓度呈线性降低趋势,油藏内耗氧主要为补偿微生物衰退时数量减少的生长耗氧;微生物脱油效率随初始溶氧浓度的增大而增大.在微生物耗氧规律和油藏渗流规律的基础上,建立了仅考虑微生物耗氧时油藏内氧浓度计算数学模型,计算了不同注入参数下氧浓度分布.结果显示,耗氧后,油藏内氧浓度随油藏半径的增加指数下降,油藏内有足够的氧供微生物生长;微生物耗氧可将空气中的氧浓度降到安全浓度,微生物耗氧到氧安全浓度的最小油藏半径约为145 m.

英文摘要：

The microbe-assisted air flooding is a new oil displacement method. Its mechanism is that the rate of microbialgrowth and metabolism can be increased by the help of oxygen in the air,which makes air flooding safer. Experiments of microbe growing and oxygen consumption were conducted under different initial concentrations of dissolved oxygen,and experiment of oil removing efficiency of the microbe under different concentrations of dissolved oxygen as well. The resultsshow that the growth of experimental strains experience lag phase,logarithmic phase,stable phase and degenerating phaseunder conditions of oxygenation and non-oxygenation. When the initial concentration of dissolved oxygen is 4.5 and 5.5 mg/L,the maximum concentration of the microbial growth is 3 times of that under non-oxygenation;the concentration of dissolved oxygen declines logarithmically at the logarithmic phase,and that declines linearly at the stable phase and degenerating phase. The decreased oxygen in the oil reservoir is due to the oxygen consumption caused by microbe degeneration,and oil removing efficiency of the microbe may increase along with the increase of the initial concentration of the dissolvedoxygen. Base on the law of oxygen consumption of the microbe and reservoir flow,mathematical model was set up to calculate the oxygen concentration distribution in the oil reservoir under different injection parameters. The result shows that theoxygen concentration decreases exponentially with increased reservoir radius;the whole well area have sufficient oxygenconcentration for microbe growing and the reservoir has become a favorable environment for microbe;and the oxygen concentration in the air is reduced to safe level for air flooding and the minimum oxygen consuming radius is about145 meters.