DRILLING FLUID

摘要

FIELD: chemistry. ^ SUBSTANCE: invention relates to drilling fluids and can be used in oil-extraction industry. The water-based drilling fluid contains the following in wt %: clay 0.1-5.0; carboxymethyl cellulose 0.3-0.4; excess sludge from biological treatment plants 5.0-10.0; water - the rest. ^ EFFECT: lower yield point with retention of high viscosity, low water loss and high salt resistance. ^ 2 tbl, 3 ex