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用动力学方法分析了LV-CMC和MV-CMC在钻井液中的降解机理。试验结果表明,这两种聚合物的降解均为一级动力学降解,降解机理同分子主链的结构密切相关,LV-CMC比MV-CMC的耐温性更强;降解的半衰期与老化温度呈指数关系,用半衰期为16h来评价,LV-CMC和MV-CMC在钻井液中最高失效温度分别为131℃和132℃。在老化时间不超过4h、老化温度低于180℃的条件下,这两种聚合物可在淡水钻井液中任意使用。
The kinetic method was used to analyze the degradation mechanism of LV-CMC and MV-CMC in drilling fluid. The experimental results show that the degradation of these two polymers are first-order kinetic degradation, the degradation mechanism is closely related to the molecular structure of the main chain, LV-CMC than MV-CMC temperature resistance stronger; degradation half-life and aging temperature Exponential relationship was evaluated with a half-life of 16 h. The maximum failure temperatures of LV-CMC and MV-CMC in drilling fluids were 131 ° C and 132 ° C, respectively. The two polymers can be used arbitrarily in freshwater drilling fluids at aging times of less than 4 h and aging temperatures below 180 ° C.