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Reservoir EngineeringPressure Transient Analysis

Radius of Investigation from Shut-In Time Calculator

ri=kΔt948ϕμctr_i=\sqrt{\frac{k\Delta t}{948\phi\mu c_t}}

Enter the required inputs, confirm the units, and run the calculator to solve r_i. 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

Radius of Investigation from Shut-In Time calculates radius of investigation 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.