聚阴离子纤维素PAC-HV、LV属于高取代度、高纯度的聚阴离子纤维素，分高粘和低粘两种为白色或浅黄色粉末，可直接加入各种水基钻井完井液中，一般加量为0.2%-1%。
       Polyanionic cellulose PAC-HV, PAC-LV is polyanionic cellulose with high degree of substitution and high purity. It has two kinds of high-viscosity and low-viscosity. It is white or light yellow powder. It can be added directly to a variety of water-based drilling and completion fluid. The general dosage is 0.2% to 1%.