PetroCalcHubFree
Browse
Reservoir EngineeringPressure Transient Analysis

Time to Semi-Steady State for Gas Well Drainage Area Calculator

tpss=15.8ϕμgictiAkt_{pss}=\frac{15.8\phi\mu_{gi}c_{ti}A}{k}

Enter the required inputs, confirm the units, and run the calculator to solve t_pss. Review the formula source and assumptions before using the result in engineering work.

Tabular solver

Inputs

Defaults provide a quick field-unit example for the equation.

5 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Time to Semi-Steady State for Gas Well Drainage Area calculates time to semi-steady state for pressure transient analysis workflows in reservoir engineering.

View formula, units, and source

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.

Common mistakes

  • Mixing unit systems without converting the inputs.
  • Using default example values as field recommendations.
  • Applying the formula outside the source assumptions.