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实验测定了钻井液／完井液处理剂及体系在１４６℃的条件中作用２ｈ前后的ＢＯＤ５，ＣＯＤｃｒ值，并计算了ＢＯＤ５／ＣＯＤｃｒ比值。采用ＢＯＤ５／ＣＯＤｃｒ比值划分钻井液化学剂及油田化学剂可生物降解性的分级标准，对７种化学剂的可生物降解性进行了分级。结果表明，高温对钻井液／完井液处理剂及体系的生物降解性有不同程度的抑制作用：对化学需氧量影响不大，而对生化需氧量影响较大；对易降解物质的生物降解性影响不大，而对难降解物质的生物降解性影响较大，使其更难降解
The BOD5 and CODcr values of the drilling fluid / completion fluid treatment system and the system before and after 2 hours of treatment at 146 ° C were measured, and the ratio of BOD5 / CODcr was calculated. The BOD5 / CODcr ratio was used to classify the biodegradability of 7 chemical agents by grading criteria of biodegradability of drilling fluid chemicals and oilfield chemicals. The results showed that high temperature had different degrees of inhibition on the biodegradability of drilling fluid / completion fluid treatment agent and system: little effect on chemical oxygen demand, but a greater impact on the biochemical oxygen demand; Little effect on biodegradability, but has a great effect on the biodegradability of refractory materials, making it more difficult to degrade