A Pilot Test Using Microbial Paraffin-Removal Technology in Daqing Oilfield

Abstract:

Microorganisms were screened from oil wastewater in Daqing Oilfield, by acclimatization, isolation and purification of microorganisms, bacterium as the only nitrogen source was obtained, which was named for strain Y-1. Experiment of identification showed that Y-1 was identified to Bacillus Cereus. Strain Y-1 was used for paraffin removal on three wells: Well Nos. 12-36, 13-39 and 14-43 in Yushulin Zone Daqing Oilfield. The results indicated that the tested wells obtained good effects after microbial treatment: the reduction rate of oil viscosity was 23.6%, the freezing point of crude oil reduced by 2.1°C, the reduction rate of oil surface tension was 38.0%, pH value was reduced from 7.2 to 6.2, daily oil production increased from 1.7t·d^-1 to 2.4t·d^-1, the rate of growth was 41.2%, the period of hot washings prolonged from 40d to 149d and the number of hot washings reduced by 4 times in Well 12-36; the reduction rate of oil viscosity was 24.8%, the freezing point of crude oil reduced by 2.7°C, the reduction rate of oil surface tension was 42.5%, pH value was reduced from 7.2 to 6.8, daily oil production increased from 1.2t·d^-1 to 1.6t·d^-1, the rate of growth was 33.3%, the period of hot washings prolonged from 45d to 158d and the number of hot washings reduced by 5 times in Well 13-39; the reduction rate of oil viscosity was 22.5%, the freezing point of crude oil reduced by 3.2°C, the reduction rate of oil surface tension was 42.5%, pH value was reduced from 7.2 to 6.4, daily oil production increased from 0.8t·d^-1 to 1.1t·d^-1, the rate of growth was 37.5%, the period of hot washings prolonged from 30d to 122d and the number of hot washings reduced by 5 times in Well 14-43. The direct economic income exceeded 210,000 Yuan.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 1299-1303
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.1299
• Online since: July 2012
• Authors: Jiang Hong Liu, Yun Peng Jia, Rui Dan Xu, Peng Ju Zhao
• Keywords: Bacillus cereus, Crude Oil, Microorganism, Removal, Wastewater

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