Petromium Tools / Formula set HYD-ECD-001
Hydraulics & ECD
Segmented single-phase hydraulics · calculated and measured audit modes · V2.0
Calculated circulation path
Calculated system · surface context
Vertical string and annulus
surface · 10,000 ft MD · 9,000 ft TVD
Mud window · ECD profile
Equivalent density versus true vertical depth
Surface loss
250 psi
String loss
1,629.1 psi
Bit loss
2,038 psi
Annular loss
209.3 psi
Calculated SPP
4,126.4 psi
Review · not an approval
Hydraulic snapshot
Bit ECD
12.447 ppg
System hydraulic power
1,083.2 hp
Bit hydraulic power
535 hp
Bit pressure fraction
49.4 %
Calculation modes
Declared mode
Surface + string + bit + annular friction with an ECD profile.
Segmented pressure model
Calculated system
Rheology equation family
The model and annulus approximation are user selections. The worksheet never switches models automatically.
User-entered ECD limits
Bit nozzles
Editable count, diameter, and discharge coefficient.
Surface-to-bit segments
Order rows from surface to bit. TVD increments build the ECD profile.
Segment result
185.8 / 7.5 psi
pipe / annulus · ECD 12.048 ppg
Segment result
371.6 / 106 psi
pipe / annulus · ECD 12.257 ppg
Segment result
1,071.7 / 95.8 psi
pipe / annulus · ECD 12.447 ppg
Calculation complete
Calculation audit
Calculated SPP
4,126 psi
Bit ECD
12.447 ppg
Jet velocity
436 ft/s
Total TVD
9,000 ft
Calculation observations
Drillpipe in open hole includes transitional flow; the worksheet linearly interpolates between the published regime boundaries.
Static single-phase result only; cuttings, rotation, transient effects, temperature/pressure rheology, local tool losses, and MPD effects are excluded.