Using this formula Equivalent Circulating Density (ECD) is calculated with the known values of Annular Pressure Loss, TVD and Mud Density/Weight.

The Formula for Equivalent Circulating Density or ECD is:

7. |
EQUIVALENT CIRCULATING DENSITY (ppg) |
[Annular Pressure Loss (psi) ÷ TVD (ft) ÷ 0.052] + Mud Density (ppg) or $$\dfrac{Annular\;Pressure\;Loss\;(psi)}{TVD(ft) \times 0.052}+Mud\;Density\;(ppg)$$ |

Problems based on Equivalent Circulating Density or ECD:

Q1. Find Equivalent Circulating Density or ECD if Annular Pressure Loss is ___ psi, TVD is ___ ft and mud density is ___ ppg.

Q2. What will be the decrease in Bottom Hole Pressure or BHP if pumps are stopped for pipe connection? Equivalent Circulating Density or ECD is ___ ppg, TVD is ___ ft and current mud density ___ ppg.

Q3. For a well of TVD ___ ft, ECD ___ ppg, Annular Pressure Loss ___ psi

(i) What will be the BHP in dynamic condition?

(ii) What will be the BHP in static condition?