| 摘要 |
FIELD: drilling fluids. SUBSTANCE: clayless drilling mud suitable for washing oil, gas, and other holes during boring and exposing production formations, including those with horizontal wellbores, contains, wt %: polyacrylamide, 0.2-0.5; additionally biopolymer, e.g. xantane-cellulose with trisaccharide side chains, 0.2-0.4; calcium carbonate, 2-5; aluminum sulfate, 0.02-0.04; and water - the balance. Drilling mud may further contain 3 to 20 wt % potassium chloride. EFFECT: lowered hydrodynamic pressure of circulation, ensured high slimeretaining and slime-removing capacities, while preserving permeability of formation. 2 cl, 2 tbl |
