Mix Drilling Fluids with Limited Space Calculator

How do we calculate this?

By hand, this is a multi-step equation that uses the ratio of the densities to determine the volume of each fluid necessary to make up the final volume. You can think about it like this: if you have two fluids of say, 14ppg and 13ppg, and want 13.5ppg mud, all you would have to do is mix half and half to get your desired density. So if you wanted 100bbls of 13.5ppg mud, you would mix 50bbls of 14ppg and 50bbls of 13ppg.

Likewise, if you wanted 13.25ppg mud, you would mix 25% 13ppg mud and 75% 14ppg mud.

So the concept is streight-forward but the math can be a bit tedious:

The Volume of your first fluid = (Desired Volume * (Desired Density - Density Fluid 2)) / (Density Fluid 1 - Density Fluid 2)

Volume Fluid 2 = Desired Volume - Volume Fluid 1

Volume Fluid 1:

Volume Fluid 2:

Formula:

The volume of the first fluid is calculated using the formula:

Volume Fluid 1 = (Desired Volume * (Desired Density - Density Fluid 2)) / (Density Fluid 1 - Density Fluid 2)\n\nVolume Fluid 2 = Desired Volume - Volume Fluid 1

Variables:

  • Desired Volume: The desired volume of the mud system (bbl)
  • Desired Density: The desired density of the mud system (ppg)
  • Density Fluid 1: The density of the first fluid (ppg)
  • Density Fluid 2: The density of the second fluid (ppg)