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分别确定了不同分子结构低分子量两性离子聚合物在无机盐存在条件下对钻井液流变性的影响。探讨了低分子量两性离子聚合物在盐水钻井液中的降粘作用机理。实验是在高粘土含量的、高矿化度条件下具有一定结构强度的钻井液中进行的。结果表明,两性离子聚合物分子量越低,阳离子化度越低,分子链节中磺酸基含量越高,其降粘效果越好。低分子量两性离子聚合物在盐水钻井液中的降粘作用是通过调整粘土颗粒的分散度和分散状态来实现的。
The effects of low molecular weight zwitterionic polymers with different molecular structures on the rheological properties of drilling fluids were determined in the presence of inorganic salts. The mechanism of viscosity reduction of low molecular weight zwitterionic polymers in brine drilling fluid was discussed. Experiments were performed in drilling fluids with a certain structural strength at high clay, high salinity conditions. The results showed that the lower the molecular weight of zwitterionic polymers, the lower the degree of cationization, the higher the content of sulfonic groups in molecular chain links, the better the viscosity reduction effect. The viscosity reduction of low molecular weight zwitterionic polymers in brine drilling fluids is achieved by adjusting the dispersion and dispersion of the clay particles.