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- Title
Evaluation of Different CH<sub>4</sub>-CO<sub>2</sub> Replacement Processes in Hydrate-Bearing Sediments by Measuring P-Wave Velocity.
- Authors
Bei Liu; Heng Pan; Xiaohui Wang; Fengguang Li; Changyu Sun; Guangjin Chen
- Abstract
The replacement of methane with carbon dioxide in natural gas hydrate-bearing sediments is considered a promising technology for simultaneously recovering natural gas and entrapping CO2. During the CH4-CO2 replacement process, the variations of geophysical property of the hydrate reservoir need to be adequately known. Since the acoustic wave velocity is an important geophysical property, in this work, the variations of P-wave velocity of hydrate-bearing sediments were measured during different CH4-CO2 replacement processes using pure gaseous CO2 and CO2/N2 gas mixtures. Our experimental results show that P-wave velocity continually decreased during all replacement processes. Compared with injecting pure gaseous CO2, injection of CO2/N2 mixture can promote the replacement process, however, it is found that the sediment experiences a loss of stiffness during the replacement process, especially when using CO2/N2 gas mixtures.
- Subjects
GAS power plants; INDUSTRIAL gases; NATURAL gas vehicles; PETROLEUM; HYDROCARBONS
- Publication
Energies (19961073), 2013, Vol 6, Issue 12, p6242
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en6126242