Production EngineeringInflow Performance
Gas Deliverability Pressure-Squared Drawdown Formula
Gas Deliverability Pressure-Squared Drawdown calculates pressure-squared drawdown for inflow performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (P_r, P_wf) are known and the assumptions behind the cited inflow performance 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, delta_p2 equals 6,750,000 psi^2.
P_rpsia
3000
P_wfpsia
1500
Inputs
P_r
psiaAverage Reservoir Pressure
P_wf
psiaFlowing Bottom-Hole Pressure
Outputs
delta_p2
psi^2
Pressure-Squared Drawdown
P_r
psia
Average Reservoir Pressure
P_wf
psia
Flowing Bottom-Hole Pressure
Source and review
reviewedPenn State PNG 301. Deliverability Testing, gas-well pressure-squared drawdown.
Source