Nd clay in drilling fluid. Dispersant In the drilling mud treatment, this product can improve the lubricity and stability of the mud to reduce the water loss, prevent sticking effectively, increase drilling efficiency. Blocking agent The product can generate cross linking under the effect of al3+, fe 3+, ca2+ and other ions, a part of high molecular compound is changed from linear shape into body shapes. The product is not water-soluble, and can be adsorbed on the borehole to block ground layer gaps and to prevent the leakage of drilling fluid. Lubricant The product can be absorbed on the surface of metal or clay particles to form liquid film to change friction on the solid surface into liquid frication, thereby lubricating drill bits and drills, lowering the mud cake frication coefficient, and reducing underground accidents. Fluid loss additive The hydrolysis degree is higher, the hydration group on the molecular chain is more, the hydration is better, and it changes from flocculant into fluid loss additive. Drilling mud should be treated to keep cake 25kg paper plastic bag