西南石油大学学报(自然科学版)

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Kinetics Research on the Process of the Exploitation of Natural Gas
Hydrate by the Replacement with CO2

Jin Fayang1, Guo Yong2, Pu Wanfen1, Liu Yongbing3, Lian Pian4   

  1. 1. School of Petroleum Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Oil Production Research Institute,COSL,Tanggu,Tianjin 300450,China
    3. New Energy Research Center,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    4. Drilling & Production Technology Research Institute,CNOOC Energy Technology & Service Ltd.,Tanggu,Tianjin 300450,China
  • Online:2013-06-01 Published:2013-06-01

Abstract:

This article studies the dynamics of the replacement reaction of carbon dioxide in porous media. To determine the
reaction rate and reaction efficiency and mechanism and to evaluate the feasibility of the replacement reaction,we designed
two sets of experimental test of the replacement reaction in porous media to measure the displacement reaction rate and reaction
rate of replacement. The simulated experiments:generate methane hydrate in the porous media;methane was replaced from
hydrates with carbon dioxide. We calculated the replacement rate and the replacement reaction rate. From the experiment we
got the total recovery of methane gas at 70.63%,the average rate of displacement reaction at 0.001 3 mol/d,which dropped
quickly with the progress of the replacement reaction. Such results confirmed that the CO2 displacement reaction is kinetically
feasible,as it is of high replacement efficiency despite the slow replacement rate.

Key words: methane hydrate, carbon dioxide hydrate, replacement reaction, reaction rate, hydrate formation