Estimation of the potential of an oil-viscosity-reducing bacterium Petrotoga sp. isolated from an oil field for MEOR

Isty A. Purwasena, Yuichi Sugai, Kyuro Sasaki

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

8 被引用数 (Scopus)

抄録

An anaerobic oil-degrading thermophile, Petrotoga sp. AR80, was isolated from reservoir brine of an oilfield in Japan. This bacterium degrades long-chain hydrocarbons of crude oil into shorter-chain hydrocarbons in brine medium. Therefore, the oil viscosity can be decreased and the enhancement of oil recovery can be expected by this bacterium. The potential of this bacterium as a candidate for MEOR was estimated in this study. Some nitrogen source which is essential for bacteria should be injected into reservoir to stimulate the bacterial growth. To select a suitable brine medium for this bacterial activity on the reduction of crude oil viscosity, the numbers of nitrogen sources were evaluated. The highest growth rate was observed in medium contained yeast extract with maximum cell concentration in this medium was 10 times higher than that in other mediums. The influence of reservoir conditions such as temperature, salinity, and pressure on the bacterium was evaluated. This bacterium can grow and decrease oil viscosity at a temperature between 50°C and 70°C. The oil viscosity incubated with Petrotoga sp. AR80 was 46.3 %, 51.6 % and 65.9 % lower than control after 3 weeks incubation at 50°C, 60°C and 70°C. In addition, the oil viscosity was 35.1 % lower than control at 70°C and 800 psi. The result of GC chromatogram showed that this bacterium can convert and/or degrade various components of oil lead to depletion in heavier oil components and enrichment of light oil components respectively. Oil extracted from Oman, China and Canada can be utilized by this bacterium instead of Japanese oil. These results show that the isolated bacterium can be applied to a wide range of reservoirs for MEOR. In addition, this bacterium achieves economically feasible MEOR because it doesn't need costly nutrients such as molasses which has been used as a nutrient in MEOR.

本文言語英語
ホスト出版物のタイトルSociety of Petroleum Engineers - SPE Annual Technical Conference and Exhibition 2010, ATCE 2010
ページ3640-3650
ページ数11
出版ステータス出版済み - 12 1 2010
イベントSPE Annual Technical Conference and Exhibition 2010, ATCE 2010 - Florence, イタリア
継続期間: 9 20 20109 22 2010

出版物シリーズ

名前Proceedings - SPE Annual Technical Conference and Exhibition
5

その他

その他SPE Annual Technical Conference and Exhibition 2010, ATCE 2010
Countryイタリア
CityFlorence
Period9/20/109/22/10

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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