针对钻井液用抑制剂性能评价过程中出现实验结论异常的现象,通过泥页岩线性膨胀量实验、岩心浸泡实验、热滚回收实验、岩心滴染扫描电镜观察实验等多种方法,探讨了多种包括无机盐、硅酸盐、聚乙烯醇等在内的抑制剂抑制性评价方法的适应性问题。结果表明,低浓度的氯化钾与氯化钠不适用于采用人工岩心浸泡实验和线性膨胀量实验进行评价;线性膨胀量实验要求抑制剂质量分数在0.3%以上且实验时间不少于6 h才能得到相对准确的实验结论;基浆粘度对泥页岩热滚回收实验具有明显的影响,基浆粘度越高初始热滚回收率越高。为此,在进行抑制剂效果评价时应充分重视评价方法、抑制剂浓度、实验持续时间、基浆粘度等多种因素的影响,寻求针对性评价手段以避免得到错误的实验结论。

In view of the abnormal phenomenon of test conclusion in the performance evaluation of inhibitors for drilling fluid,the adaptability of the evaluation methods for the inhibition of various inhibitors,including inorganic salts,silicate,polyvinylalcohol,etc.,is discussed through the shale linear swelling test,core soaking test,heat rolling recovery test,core drop dye scanning electron microscope test and other methods.The results show that KCl and NaCl with low concentration are not suitable to be evaluated by artificial core immersion test and linear swelling test.The linear swelling test requires inhibitor concentration above 0.3% and test time no less than 6 h.The viscosity of the base slurry has an obvious effect on the hot roll-ing recovery rate.The higher the viscosity of the base slurry leads to the higher the initial recovery rate.Therefore,more attention should be paid to the influence of evaluation methods,inhibitor concentration,test time,base slurry viscosity and other factors for evaluating the effect of inhibitors in order to seek targeted evaluation methods to avoid getting wrong test conclusions.