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- Title
CO<sub>2</sub>开发页岩油藏研究进展.
- Authors
张志超; 李红雷; 于春勇; 韩继封; 王慧娟; 刘业新
- Abstract
In order to improve the understanding of mechanism and law of utilizing CO2to develop shale oil reservoir, the EOR mechanisms of shale oil reservoir applied CO2flooding was systematically discussed, including the rapid energy enhancement, viscosity reduction, plug removal, oil extraction and reservoir stimulation of shale oil reservoir, etc. Later, the technical characteristic and reservoir production characteristic of shale oil with CO2development were described in detail. With the quantity increase of CO2injection in shale oil reservoir, the two-phase envelope line area in p-T phase diagram of CO2developed shale oil was enlarged, meanwhile, the critical point also moved up, which enhanced the energy of the reservoir with solution gas flooding. Due to the adequate development of fractures in shale reservoir, CO2huff and puff was more suitable for the development of shale oil compared with CO2flooding. The essence of CO2huff and puff to enhance shale oil recovery was the strong CO2diffusion, mass transfer and energy supplement effect in shale matrix. In addition, the miscible huff and puff effect in shale reservoir with fractures formation was better than that of immiscible huff and puff in reservoir without fractures. When CO2was applied to develop shale reservoir, only the oil in the pores above 0.008 μm was mainly produced. Furthermore, the oil in the large pores of shale matrix was produced first. The method that enhanced the lower oil production limit in pore size by CO2flooding in shale reservoir was to increase injection pressure or increase effective huff and puff cycle, thereby enhancing the diffusion and mass transfer ability of CO2in shale reservoir.
- Subjects
SHALE oils; GAS reservoirs; PETROLEUM reservoirs; MASS transfer; SHALE
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p543
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.024