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- Title
页岩注入超临界CO<sub>2</sub>渗流及增透实验.
- Authors
吴迪; 翟文博; 梁冰; 孙可明; 肖晓春; 刘雪莹; 苗丰
- Abstract
In this paper,taking the Longmaxi Formation shale in Yanzicun of Shuanghe Town,Changning County,Sichuan Province as the object of study,the supercritical CO2 percolation and antitransmittance regularity tests in shale considering the influence of injection pressure and volume stress are carried out by using a triaxial percolation apparatus developed by ourselves. The experimental results show that the supercritical CO2 permeability in shale decreases first and then increases with the increase of pore pressure. When the pore pressure is small,the Klinkenberg effect is obvious,and the permeability decreases with the increase of volume stress. The curve basically presents the law of negative exponential change. CH4 percolation experiments were carried out in shale under different antireflection conditions,and macroscopic quantitative analysis of supercritical CO2 was carried out. The effect of injection pressure on the antitransmittance of shale was analyzed. It can be concluded that with the increase of supercritical CO2 injection pressure,the permeability of CH4 increases,but the increasing range increases first and then decreases. That is,supercritical CO2 injection pressure of 9.5MPa is the most obvious antireflection effect. According to the microanalysis of shale element content,supercritical CO2 can extract and dissolve mineral elements such as O,Ca,Mg in shale,promote the development of micropores in shale effectively,and enhance the permeability of shale.
- Subjects
SICHUAN Sheng (China); SHALE; PERMEABILITY; PERCOLATION; SUPERCRITICAL carbon dioxide; ANTIREFLECTIVE coatings; QUANTITATIVE research; CARBON dioxide
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 10, p1406
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.07.009