水解聚丙烯腈在钻井液中的热稳定性研究

Study on Thermal Stability of NH_4-PAN(Hydrolized Polyacrylonitrile-Per oxy Acetrl Nitrate) in Drilling Fluids.

用动力学方法研究了水解聚丙烯腈在钻井液中的降解机理，发现其降解机理随温度的变化而不同，低于１８０℃时，为动力学一级降解；高于１８０℃时，为动力学连续一级降解，并通过红外光谱对产生复杂降解机理加以解释，由微机拟合出连续一级降解动力学失水曲线，得出水解聚丙烯腈在钻井液中失效的最高温度。

studies the degradation mechanism of thermal stability of NH4-PAN in drilling fluids by the kinetics method,and finds that the mechanism of degradation is different with the change of aging temperature.At temperatures below 180℃,the kinetic degradation mechanism of NH4-PAN is of the first-order reaction,and over 180℃ it changes to the consecutive-first-order reaction.The reason which causes the complex reaction is explained by IR spectra, and kinetic water loss curves of the consecutivefirstorder reaction has been simulated on computer.The highest temperature at which the loss of efficacy will occur is obtained.