总结了强化CO2 置换甲烷水合物过程的研究，包括调节外界温压、使用添加剂、改变CO2 注入形态以及结合几种天然气开采方法等方面对CO2 -CH4 置换过程的影响。研究表明：一定范围内，置换效率随温度和压力的升高而增大，其中温度较压力的影响更为显著；适当的添加剂对置换效果有促进作用；对于纯质CO2 ，置换效率乳液状CO2 >液态CO2 >气态CO2，混合气体（N2 和CO2 ）的置换效率较纯质CO2 气体大；CO2 置换法与传统开采方法的结合也大大增加了置换效率。最后，在论述目前强化CO2 置换开采法研究现状的基础上，指出了现存研究方法的一些不足，并对今后的研究工作进行了展望。

This paper summarized recent overseas and domestic researches in enhancement methods on replacement of CH4 from methane hydrate with CO2, including adjusting temperature and pressure, using additives, changing injection states of CO2 and combining with the other recovery methods. It indicated that: replacement efficiency increased with the rise of temperature and pressure, and the impact of temperature was more significant than pressure; in the meantime, appropriate surfactants and injection states of CO2 made for better displacement performances. As for pure CO2, the replacement order was shown as follows: CO2 emulsion> CO2 liquid> CO2 gas, and the replacement reaction was promoted by mixture of N2/ CO2. In addition, combining injection CO2 with other exploitation techniques could also strengthen the replacement processes prominently. Finally, based on the discussions from many researchers obtained about enhancement ways on replacement of CH4 from hydrate with CO2, some potential problems and development direction were put forward

国家自然科学基金资助项目（50706028）