Abstract
A microbial enhanced oil recovery (MEOR) field test has been performed for 10 consecutive years at Block Luo801, whose temperature is 75–80°C in Shengli Oil Field in China. After the implementation of MEOR, the produced fluid samples from the oil wells were analyzed and found an increase in the density of bacteria and archaea in waterphase stabilizing at 103–4 cell/ml, which suggesting the nutrient injected has activated the indigenous bacteria in the reservoir. These indigenous bacteria activities were enhanced to prevent the water cut from rising up in the block so as to increase the oil output. Up to December 2010, the cumulative increased production of oil has been 9.75 × 104 t with the total output surpassing that of water flooding oil recovery (WFOR) by 3.35%. Considering the cost of injected microbial fluid and nutrient, oil increased per tonne costs about RMB339.56.
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