Drilling EngineeringWell Control
Constant Bottomhole Pressure Bleed Volume for Rising Gas Formula
Constant Bottomhole Pressure Bleed Volume for Rising Gas calculates bleed volume for constant bottomhole pressure for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (dP_step, C_a, G) are known and the assumptions behind the cited well control relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, V_bleed equals 20.769231 bbl.
dP_steppsi
100
C_abbl/ft
0.1458
Gpsi/ft
0.702
Inputs
dP_step
psiAllowed Casing Pressure Increase Step
C_a
bbl/ftHole or Annular Capacity
G
psi/ftMud Gradient
Outputs
V_bleed
bbl
Bleed Volume for Constant Bottomhole Pressure
dP_step
psi
Allowed Casing Pressure Increase Step
C_a
bbl/ft
Hole or Annular Capacity
G
psi/ft
Mud Gradient
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 142.
Source