Well control equations
Equations
Charts & Tables
1. Pressure (psi)
[pic]
2. Pressure Gradient (psi/ft)
[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....
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