| abstract |
Defoamer compositions comprise between 40 vol% and about 80 vol% distilled water (other waters may be used instead), 10 vol% and about 30 vol% of a first silicone anti-foam agent and between about 10 vol% and about 30 vol% of a second active silicone antifoam agent. The defoamer compositions are used in amount of less than or equal to 500 ppm in all foamed fluids e.g. drilling fluids, completion fluids, fracturing fluids, stimulating fluids and cements, used in downhole fluid systems. The first silicone anti-foam may be Antifoam B and the second anti-foam may be Antifoam 1410. The defoaming composition may be a milky white liquid with a pH of 7.03 and a specific gravity of 0.997. Also shown is a method of using the defoamer composition. |