Microbial-lnduced oil viscosity reduction by selective degradation of long-chain alkanes

Yuichi Sugai, Keita Komatsu, Kyuro Sasaki, Kristian Mogensen, Martin Vad Bennetzen

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

8 被引用数 (Scopus)

抄録

Application of a thermophilic anaerobic bacterium which degrades long-chain alkanes of crude oil preferentially and induces oil viscosity reduction to MEOR in our target oilfield was evaluated in this study. Although the salinity of formation-water in our target reservoir is approximately 10 % which is considerably higher than the optimum salinity for the bacterium, the bacterium can grow well and induce oil viscosity reduction in the formation-water which was diluted with sea-water whose salinity was approximately 4 % and contained yeast extract as a nitrogen source. Oil viscosity was reduced to 70 percent of its original viscosity after two-week incubation of the bacterium in the culture medium consisting of sea-water supplemented with 1.0 g/L of yeast extract. The performance of MEOR using this bacterium was evaluated by numerical simulation using two dimensional oil-water two-phase flow model. This model consists of 6 compositions: degraded oil, undegraded oil, brine, bacterium, sodium chloride and yeast extract. Undegraded oil and yeast extract are carbon source and nitrogen source for the bacterial growth respectively. Growth rate of the bacterium is calculated by Monod equation depending on the variables of the concentration of yeast extract and sodium chloride. Conversion of undegraded oil into degraded oil is depended on the proliferation of the bacterium. Growth of the bacterium is stopped by deficiency of either yeast extract or undegraded oil. Oil viscosity is reduced as the percentage of degraded oil in oil phase increases. Residual oil saturation is improved by oil viscosity reduction and enhancement of oil recovery can be obtained. According to the numerical experiments, growth of the bacterium and oil viscosity reduction were found only around the injection well because the bacterium consumed whole yeast extract around there. Recovery factor therefore can be increased by increase of injection volume of yeast extract. As a result, enhancement of oil recovery reached to 5 % by 1.0 pore volume injection of sea-water containing the bacterium and 1.0 g/L of yeast extract. 100 bbl of oil was recovered additionally by using 1.0 tons of yeast extract in that case.

本文言語英語
ホスト出版物のタイトルSociety of Petroleum Engineers - 30th Abu Dhabi International Petroleum Exhibition and Conference, ADIPEC 2014
ホスト出版物のサブタイトルChallenges and Opportunities for the Next 30 Years
出版社Society of Petroleum Engineers
ページ1829-1841
ページ数13
ISBN(電子版)9781634398053
出版ステータス出版済み - 1 1 2014
イベント30th Abu Dhabi International Petroleum Exhibition and Conference: Challenges and Opportunities for the Next 30 Years, ADIPEC 2014 - Abu Dhabi, アラブ首長国連邦
継続期間: 11 10 201411 13 2014

出版物シリーズ

名前Society of Petroleum Engineers - 30th Abu Dhabi International Petroleum Exhibition and Conference, ADIPEC 2014: Challenges and Opportunities for the Next 30 Years
3

その他

その他30th Abu Dhabi International Petroleum Exhibition and Conference: Challenges and Opportunities for the Next 30 Years, ADIPEC 2014
Countryアラブ首長国連邦
CityAbu Dhabi
Period11/10/1411/13/14

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geochemistry and Petrology
  • Fuel Technology

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