Abstract
After a long term of water flooding, the near well area of Weixing oilfield was blocked by a large amount of colloids, asphaltenes and waxes, resulting in a decline in oil well production. It is urgent to explore new technologies to slow the decline of production and increase the production per well. The results of microbial reservoir adaptability evaluation show that the microbial huff and puff test is suitable for Weixing oilfield. 5 pilot test Wells were selected under the well selection principle, and the compatibility of bacillus subtilis SL-2 with native reservoir bacteria and the emulsifying effect on crude oil were evaluated. The corresponding huff and puff scheme is designed according to the production status, pay-zone thickness, treatment radius and porosity. After microbial huff and puff, the daily liquid production increased from 28.2 t/d to 63.4 t/d, the oil production increased from 9.7 t/d to 25.0 t/d. Throughput is valid for 240 days, the cumulative oil production of five wells was2048 t, and the economic benefit was good. After resuming production, the bacterial concentration of the produced liquid rose significantly to more than 107 cfu/mL, indicating that the injected microbial strain grew well in the target reservoir and had good oil-increasing potential.
Published Version
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