Definition - What does Slurry Density mean?
Slurry Density is the ratio of sum of the weight of water and additives to the volume of cement slurry. It is usually expressed in kilogram per cubic meter (kg/m3) or pounds per gallon (lb/gal). In a typical oil or gas well, cement slurry density can range from 1380 to 2280 kg/m3 or 11.5 to 19.0 lb/gal. With the help of special techniques such as foamed cementing and cementing through particle size distribution, the Slurry Density of the mixture can be improved up to 2780 kg/m3 or 23 lb/gal.
Petropedia explains Slurry Density
In order to calculate the Slurry Density, the following parameters needs to be found out in the order:
1. Additive weight per cement sack (in pounds, lb)
Weight = percent of additive x 94 lb/sk
2. Total amount of water requirement (in gallon per sack, gal/sk)
Water = water requirement by cement (gal/sk) + water requirement by additives (gal/sk)
3. Slurry volume (in gallon per sack, gal/sk)
Volume = (94 lb / Specific Gravity of cement x 8.33 lb/gal) + (weight of additive, Ib / Specific Gravity of additive x 8.33 lb/gal) + water volume, gal.
4. Slurry Yield (in ft3/sk)
Slurry yield = Slurry volume, gal/sk / 7.48 gal/ft3
5. Slurry Density (in pounds per gallon, lb/gal)
Slurry density = 94 + weight of additive + (8.33 x volume of water per sack) / slurry vol, gal/sk.