gas hydrate - CCOP

From the above discussion, the heat injection involves the following features:
1) The gas production rate keeps constant, and is mainly controlled by temperature.
2) The water production rate is larger, which is unfavorable for gas production.
3) The heat loss is great, resulting in low energy ratio for gas production.
4) Compared with the depressurization method, the heat injection method is much more
complicated.
The follow measures should be taken to optimize the efficiency of hot water injection:
1) Optimize the hot water injection temperature and injection rate.
2) Consider some more effective heat injection methods, such as hot water slug injection.
3) Combine the heat injection and depressurization methods.
4) Reduce the heat loss by adapting more effective heat injection technology.
CONCLUSIONS
This paper suggests a new strategy for offshore hydrate production, and reports on onedimensional
experimental studies on hydrate production by depressurization and heat
injection methods. The general conclusions are as follows:
1) Offshore gas hydrate production should combine multi methods, at the same time to
utilize the current deep-water engineering technology and experience;
2) Depressurization is a viable method for hydrate dissociation, and the gas production
rate is controlled by the depressurization rate. The hydrate dissociation specific surface
is bigger, resulting in a high gas production rate;
3) Heat injection is a complicated process, and the gas production rate is mainly
controlled by the temperature. The main weakness of this method is its low efficiency;
4) An efficient hydrate production strategy should be a combined method, including heat
injection, depressurization and other kinds of methods, which will be a cost effective
way to develop natural gas hydrate.
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Xuhong, Liu Shouquan, Wang Jianqiao,etc.. The research state and main technology of
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Sung Won-mo Huh Dae-hee Ryu Byong-Jae etc. Development and Application of Gas
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Yousif, M.H., Abass, H.H., Selim, M.S. and Sloan, E.D. Experiment and Theoretical
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New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 75