Exploitation of methane in the hydrate by use of carbon dioxide in the presence of sodium chloride  

作　　者：Zunzhao Li Xuqiang Guo Lanying Yang Xiaona Ma 

机构地区：[1]China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

出　　处：《Petroleum Science》2009年第4期426-432,共7页石油科学（英文版）

基　　金：support received from the National Natural Science Foundation of China (20476058,20676146);Ministry of Science and Technology of China (2006AA09A208,2009CB219504);Specialized Research Fund for the Doctoral Program of Higher Education (20070425001)

摘　　要：The replacement process of CH4 from CH4 hydrate formed in NaCl solution by using pressurized CO2 was investigated with a self-designed device at temperatures of 271.05, 273.15 and 275.05 K and a constant pressure of 3.30 MPa. The mass fraction of the NaCl solution was either 0.5 wt% or 1.0 wt%. The effects of temperature and concentration of NaCl solution on the replacement process were investigated. Experimental results showed that high temperature was favorable to the replacement reaction but high NaCl concentration had a negative effect on the replacement process. Based on the experimental data, kinetic models of CH4 hydrate decomposition and CO2 hydrate formation in NaCl solution were established. The calculated activation energies suggested that both CH4 hydrate decomposition and CO2 hydrate formation are dominated by diffusion in the hydrate phase.The replacement process of CH4 from CH4 hydrate formed in NaCl solution by using pressurized CO2 was investigated with a self-designed device at temperatures of 271.05, 273.15 and 275.05 K and a constant pressure of 3.30 MPa. The mass fraction of the NaCl solution was either 0.5 wt% or 1.0 wt%. The effects of temperature and concentration of NaCl solution on the replacement process were investigated. Experimental results showed that high temperature was favorable to the replacement reaction but high NaCl concentration had a negative effect on the replacement process. Based on the experimental data, kinetic models of CH4 hydrate decomposition and CO2 hydrate formation in NaCl solution were established. The calculated activation energies suggested that both CH4 hydrate decomposition and CO2 hydrate formation are dominated by diffusion in the hydrate phase.

关 键 词：CO2 hydrate CH4 hydrate guest molecule replacement kinetic model 

分 类 号：TE357[石油与天然气工程—油气田开发工程]