Evaluation of the Potential of Foam Producing Microorganism Improving Heterogeneity of Permeability for Novel Microbial Foam EOR

Miu Ito, Yuichi Sugai

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

抄録

The foam improves heterogeneity of permeability in oil reservoir and contributes to enhancing oil recovery. Both surfactant and gas are alternatingly injected into oil reservoir in foam EOR, therefore, it has several challenges: high cost of surfactant, formation of precipitation with bivalent cations, adsorption of surfactant on reservoir rock, etc. This study proposes the microbial foam EOR which overcomes those challenges by having microorganism generate foam in-situ. We have found an ability of a microorganism belonging to Pseudomonas aeruginosa to generate foam under anaerobic conditions. This study investigated the source materials constructing the foam and capacity of the foam to improve the heterogeneity of the permeability. The challenges of our study are the reproducibility of the foam generation and the foam stability. This study therefore examined the source materials of the foam to understand the mechanisms of the foam generation. We focused on protein, which has been suggested as a possible component of the foam in our previous studies, and examined the relationship between the amount of foam generated by P. aeruginosa and the concentration of protein in its culture solution. As a result, a positive correlation was found between them. This result indicates that the foam generated by P. aeruginosa is composed of the protein produced by the microorganism. Next, the performance of the foam decreasing permeability of high permeability porous media was evaluated through sand pack flooding experiment. P. aeruginosa was injected into a sand pack and cultivated in-situ. The post-flush water was injected into the sand pack after three days' in-situ cultivation to measure the permeability. As a result, the permeability of the sand pack was successfully decreased to half after the cultivation. The permeability of a sand pack in which P. aeruginosa was injected with culture medium and in-situ cultivated was successfully decreased to half of initial. The efflux of bacterial cells of P. aeruginosa was detected after injecting 1.3 pore volumes of postflush water, which shows that the postflush water flowed through areas other than the area where P. aeruginosa grew and produced the foam. These results indicate that the foam produced in-situ by P. aeruginosa is effective for improving the heterogeneity of permeability in oil reservoir. This EOR can be operated at low cost without expensive chemicals. Because the foam produced by P. aeruginosa is induced by proteins, the precipitation will not be formed in oil reservoir. The stability of protein-induced foam is higher than that of surfactant-induced foam in the presence of oil or high saline conditions. The microbial foam EOR therefore has high potential improving the heterogeneity of permeability in oil reservoir more effectively than the conventional foam EOR.

本文言語英語
ホスト出版物のタイトルSociety of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2022, APOG 2022
出版社Society of Petroleum Engineers
ISBN(電子版)9781613998601
DOI
出版ステータス出版済み - 2022
イベント2022 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOG 2022 - Adelaide, オーストラリア
継続期間: 10月 17 202210月 19 2022

出版物シリーズ

名前Society of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2022, APOG 2022

会議

会議2022 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOG 2022
国/地域オーストラリア
CityAdelaide
Period10/17/2210/19/22

!!!All Science Journal Classification (ASJC) codes

  • エネルギー工学および電力技術
  • 燃料技術

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