Effect of magnesium and aluminum powders on the performance of CO2 phase change excitation agent
In order to improve the heat release of CO2 phase change excitation agent,2％and 4％magnesium powder or aluminum powder was added to the excitation agent.The thermal decomposition characteristics,safety,temperature resistance and reaction heat were studied by thermogravimetry(TG),ignition test,temperature resistance test and reaction heat test.The results show that the thermal decomposition characteristics of excitation agent did not change significantly,the apparent activation energy of excitation agent added with 2％and 4％magnesium powder increased by 16.68 kJ/mol and 43.96 kJ/mol,the reaction heat increased by 5.1％and 10％;the apparent activation energy of the same proportion of aluminum powder increased by 28.89 kJ/mol and 55.21 kJ/mol,the reaction heat increased by 6.6％and 12.9％;the ignition test shows that the excitation agent with a small amount of magnesium powder or aluminum powder has no explosion danger and its safety is good;the excitation agent added with magnesium powder or aluminum powder has not changed significantly at 70 ℃ for 48 hours,the temperature index Ts was about 90 ℃,indicating that its temperature resistance was good.
expansion fracturing with liquid CO2excitation agentheat of reaction
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