Microbiological and production characteristics of the high-temperature Kongdian petroleum reservoir revealed during field trial of biotechnology for the enhancement of oil recovery
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- 作者：T. N. Nazina ; A. A. Griror’yan ; Qingxian Feng ; N. M. Shestakova ; T. L. Babich ; N. K. Pavlova ; V. S. Ivoilov ; Fangtian Ni ; Jianqiang Wang and Yuehui She ; et al.
- 关键词：oilfields ; thermophiles ; sulfate reduction ; methanogenesis ; oil oxidation ; MEOR
- 刊名：Microbiology
- 出版年：2007
- 出版时间：June, 2007
- 年：2007
- 卷：76
- 期：3
- 页码：297-309
- 全文大小：353 KB
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Microbiology
Medical Microbiology
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1608-3237
文摘
Microbiological technology for the enhancement of oil recovery based on the activation of the stratal microflora was tested in the high-temperature horizons of the Kongdian bed (60°C) of the Dagang oil-field (China). This biotechnology consists in the pumping of a water-air mixture and nitrogen and phosphorus mineral salts into the oil stratum through injection wells in order to stimulate the activity of the stratal microflora which produce oil-releasing metabolites. Monitoring of the physicochemical, microbiological, and production characteristics of the trial site has revealed large changes in the ecosystem as a result of the application of biotechnology. The cell numbers of thermophilic hydrocarbon-oxidizing, fermentative, sulfate-reducing, and methanogenic microorganisms increased 10–10000-fold. The rates of methanogenesis and sulfate reduction increased in the near-bottom zone of the injection wells and of some production wells. The microbial oil transformation was accompanied by the accumulation of bicarbonate ions, volatile fatty acids, and biosurfactants in the formation waters, as well as of CH4 and CO2 both in the gas phase and in the oil. Microbial metabolites promoted the additional recovery of oil. As a result of the application of biotechnology, the water content in the production liquid from the trial site decreased, and the oil content increased. This allowed the recovery of more than 14000 tons of additional oil over 3.5 years.