Evaluation of Different CH 4 -CO 2 Replacement Processes in Hydrate-Bearing Sediments by Measuring P-Wave Velocity

Bei Liu, Heng Pan, Xiaohui Wang, Fengguang Li, Changyu Sun and Guangjin Chen
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Bei Liu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Heng Pan: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Xiaohui Wang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Fengguang Li: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Changyu Sun: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Guangjin Chen: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Energies, 2013, vol. 6, issue 12, 1-13

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 CO 2 . During the CH 4 -CO 2 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 CH 4 -CO 2 replacement processes using pure gaseous CO 2 and CO 2 /N 2 gas mixtures. Our experimental results show that P-wave velocity continually decreased during all replacement processes. Compared with injecting pure gaseous CO 2 , injection of CO 2 /N 2 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 CO 2 /N 2 gas mixtures.

Keywords: gas hydrate; CH 4 -CO 2 replacement; P-wave velocity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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