# Well control equations

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WELL CONTROL

Equations
Charts & Tables
1. Pressure (psi)

[pic]

[pic]

3. Hydrostatic Pressure (psi)

a. [pic]b. [pic]

c. [pic]

4. Equivalent Density (ppg)

[pic]

5. Formation Pressure (psi)

[pic]
assuming shut-in well with BHP equalized with formationpressure

6. Density to Balance Formation (ppg)

[pic]
7. Equivalent Mud Weight, EMW (ppg)

[pic]

8. Maximum Allowable Surface Pressure, MASP (psi) Based on CasingBurst.

[pic] [pic]

9. Maximum Initial Shut-In Casing Pressure, MISICP (psi) Upon initial closure only--Based on
formation breakdown @ shoe. ForIWCF, written as initial MAASP.
[pic]

10. Initial Circulating Pressure (psi) ENGINEER'S & DRILLER'S METHODS.

[pic]

11. FinalCirculating Pressure (psi) ENGINEER'S METHOD.

[pic]

12. Equivalent Circulating Density, ECD (ppg)

[pic]

13. Gas Pressure and Volume Relationship -- Boyle's Law[pic] The Pressure (psi) of a gas bubble times its Volume (bbl) in one
part of the hole equals its Pressure times its Volume in another.
Disregards effects of Temperature (T) and gascompressibility (z)
[pic] or [pic]

14. Pump Output (bbl/min)

[pic]

15. 100% Triplex Pump Output (bbl/stroke)

[pic]

16. Surface To Bit Strokes (strokes)[pic]

17. Circulating Time (min)

[pic]

18. Open Hole Capacity Factor (bbl/ft)

[pic]

19. Pipe Capacity Factor (bbl/ft)

[pic]

20. Annulus CapacityFactor, ACF (bbl/ft)

[pic]

21. Pipe Displacement (bbl/ft) Disregarding tool joints.

[pic]

22. Total Pipe Displacement Including Capacity (bbl/ft) Disregarding tool joints....