DEEP-WELL POLYSULFONATE DRILLING FLUID AND PREPARATION METHOD THEREFOR

摘要

A deep-well polysulfonate drilling liquid, comprising water, bentonite, sodium carbonate, a sulfomethyl phenolic resin, sulfonated lignite, a halide salt, a filtrate reducer, sodium polyacrylate, sodium bisulfite and barite. On the basis of 100 parts by weight of water, the content of bentonite is 3.5‑5 parts by weight, the content of sodium carbonate is 0.15‑0.35 parts by weight, the content of the sulfomethyl phenolic resin is 6‑8 parts by weight, the content of the sulfonated lignite is 6‑8 parts by weight, the content of the halide salt is 7.5‑12 parts by weight, the content of the filtrate reducer is 0.5‑1.2 parts by weight, the content of sodium polyacrylate is 0.8‑1.7 parts by weight, the content of sodium bisulfite is 3-5 parts by weight, and the content of barite is 250‑300 parts by weight. Further disclosed is a preparation method for the deep-well polysulfonate drilling fluid.