3.3.7 Hydraulics
The hydraulics window is used to calculate the modus operandi of the well. No slip is chosen in this section because it is assumed that the cuttings move at the same speed with the drilling fluid hence there is perfect hole cleaning. The results gotten from the calculations are shown below. The equivalent circulation density which is the density exerted by a circulating fluid against the formation is calculated using the equation below. It is very important in the avoidance of kick and losses.
\(ECD=d+\frac{P}{0.052*D}\ \) (12)
Where,
D = mud weight (ppg), P = pressure drop and D = true vertical depth
The graphs below show the pressure in the drill string, the annular pressure, the temperature, the equivalent viscosity, velocity, the cuttings velocity and transport ratio.