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Indexed by:会议论文

Date of Publication:2014-01-01

Included Journals:CPCI-S

Volume:61

Page Number:393-397

Key Words:Enhanced Gas Recovery; Dispersion; CO2 Sequestration; Sand Pack; CT scan

Abstract:Enhanced Gas Recovery by injecting CO2 is one of the efficient scenarios to accelerate gas production if the excessive mixing can be avoided in the process of CO2-CH4 displacement. A laboratory investigation was presented to describe the detailed CO2-CH4 displacement and analyze CO2 dispersion into CH4 in the sand pack for pressure of 10-14 MPa at 40 degrees C with the CO2 injection rate of 0.2, 0.3 and 0.4 ml/min. And the displacement process was scanned by an X-ray micro-CT scanner. The results of CT scan images were consistent with the breakthrough profile obtained from outlet gas composition analysis. The dispersion coefficient is in the range from 4.478 x 10(-7) to 9.898 x 10(-7)mm(2)/s and it increase with interstitial velocity of CO2 and decrease with pressure. The dispersivity of BZ04 sand pack is calculated as 0.0054 m. (C) 2014 Published by Elsevier Ltd.