Final Circulating Pressure Calculator
Enter slow circulating pressure, original mud weight, and kill mud weight. The calculator returns final circulating pressure.
Calculation context and source notes
Final circulating pressure estimates circulating pressure after kill-weight mud reaches the bit at the planned kill rate.
Use it with initial circulating pressure to build the drillpipe-pressure schedule for a kill operation, then confirm the pressure endpoint against the selected kill rate, kill-mud weight, and approved kill sheet.
Solves for
FCP (psi)
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Formula, variables, and sourceRelated source-backed guides
Formula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns FCP = 1,030.754717 psi. Defaults demonstrate the implementation; they are not recommended field values.
900
12.14
10.6
Input definitions
SCRP
psiSlow Circulating Rate Pressure
KWM
ppgKill Weight Mud
OMW
ppgOriginal Mud Weight
Output definitions
FCP
Final Circulating Pressure
SCRP
Slow Circulating Rate Pressure
KWM
Kill Weight Mud
OMW
Original Mud Weight
Engineering use, assumptions, and limits
Use it with initial circulating pressure to build the drillpipe-pressure schedule for a kill operation, then confirm the pressure endpoint against the selected kill rate, kill-mud weight, and approved kill sheet.
Assumptions
- Slow circulating pressure is measured at the kill rate.
- Mud weights are in the same unit system.
- Pump speed and hydraulics remain comparable during the schedule.
Limitations
- Does not model dynamic choke response, gas expansion, or changing annular friction.
- Must be checked against the approved well-control method.
Common mistakes
- Using ICP where FCP should be used after kill mud reaches the bit.
- Mixing mud weight units.
- Ignoring planned kill-rate changes.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Drilling Manual. Well Control Formulas & Illustrated Examples.
Open source reference