地质钻探过程中碰到疏忪、裂隙及膨胀的岩层,常出现钻孔缩径、坍塌掉块、钙侵、盐侵等情况,如处理不当,就会造成严重的孔内事故。使用性能良好的泥浆对保证钻孔安全起着重要作用。调节泥浆性能主要方法之一是化学处理。我队历年来曾使用过煤碱剂、单宁酸、羧基甲基纤维素钠(CMC)、烤胶和腐植酸等作为泥浆化学处理剂。从使用况看,煤碱剂、单宁酸、烤胶和腐植酸在一般情况下对降低失水量、减稠的效果是好的,但其性能不稳定、用量大、配制较复杂、用量不当还会引起泥浆聚结。羧基甲基纤维素钠对降低失水量有良好效果,但不能减稠,对钻进效率有影响,特别是钢粒钻进时更显著,另外成本也过高,大量 Geological drilling encountered dredging, fissures and swelling of rock formations, often borehole shrinkage, collapse blocks, calcium invasion, salt intrusion and so on, such as improper handling, it will cause serious accidents in the hole. Using well-performing mud plays an important role in ensuring borehole safety. One of the main methods of adjusting mud performance is chemical treatment. Over the years, our team has used coal-base agents, tannic acid, sodium carboxymethylcellulose (CMC), baking gum and humic acid as mud chemical treatment agent. From the use of the situation, the coal-based agents, tannic acid, baked plastic and humic acid in general to reduce the loss of water, the effect of reducing thick is good, but its performance is unstable, large dosage, complex preparation, the amount of improper Will also cause mud coalescence. Sodium carboxymethyl cellulose to reduce the loss of water has good results, but can not be reduced, affecting the drilling efficiency, especially when drilling more significant, the other costs are too high, a large number