METHOD OF NEUTRALIZING BORING SLUDGE CONTAINED IN SPENT DRILLING MUD Russian patent published in 2003 - IPC

FIELD: drilling fluids. SUBSTANCE: method consists in separating solid and liquid phases of drilling mud by adding aluminosilicates hydrolyzed to pH value 9-12. Resulting solid phase precipitate is loaded into mixer wherein it is mixed with also added there liquifying powder complexing agent containing following components, wt.%: Portland cement, 20-30; burnt lime, 10-15; calcium carbonate, 10-20; phosphogypsum, 10-40; and dolomite, 10-20; 0.2 to 1.0 weight parts of complexing agent being added per 1 weight part of precipitate to be treated. EFFECT: avoided use of sludge-storage facilities. 2 cl, 1 dwg, 3 tbl