Based on the MEOR mechanism study of Brevibacillus brevis and Bacillus cereus,From 2002 to 2004,the two strain and other microbes were applied in the microbial huff and puff as well as the Microbial enhanced waterflood test in Daqing excessively low permeability(1.0md-25md)reservoir.After bacteria injection,44 among the 60 huff and puff wells shows a significant oil production response-the accumulative oil increment reaches 9175.5 tons and the input-output ratio amounts to 1:8.The Microbial enhanced waterflood test carried out in June 2004 also provides a satisfying result.
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