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.