Petroleum Relative Permeability Krw Calculator

Infer actual water phase relative permeability from matched Darcy core-flow/viscosity/geometry, independently established absolute permeability and net potential drop; negative/>1 apparent measurement evidence retained, no saturation law or experiment recipe. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.

Description

Relative permeability compares a phase’s effective flow capacity with an independently measured absolute permeability.

Relative permeability compares a phase’s effective flow capacity with an independently measured absolute permeability.^[1]

This water tool inverts matched core-flow observations and retains signed or above-one apparent results for review.

When to use Petroleum Relative Permeability Krw Calculator

Use this tool when you need to calculate the stated measurement summary or conditional model from matched observations. Prepare completed matched measurements, SI or explicitly stated oilfield units, and independent evidence for the selected branch or calibration.

How to use Petroleum Relative Permeability Krw Calculator and understand its results

Prepare completed matched measurements, SI or explicitly stated oilfield units, and independent evidence for the selected branch or calibration.
Enter observedWaterPhaseFlowM3Second, observedWaterPhaseViscosityPaSeconds, observedWaterCoreLengthsM, callerMatchedWaterAbsolutePermeabilityM2, observedWaterCoreAreasM2, observedWaterNetPotentialDropsPa, following the field table and calculation rules below, then run the tool.
Read apparentObservedPhaseRelativePermeabilities. For result objects, inspect the nested output fields below, including any missing evidence or selected indices.
Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.

Input field	Meaning	Value type	Requirement
observedWaterPhaseFlowM3Second	Observed water phase flow m3 second	list of number	Required
observedWaterPhaseViscosityPaSeconds	Observed water phase viscosity pa seconds	list of number	Required
observedWaterCoreLengthsM	Observed water core lengths m	list of number	Required
callerMatchedWaterAbsolutePermeabilityM2	Caller matched water absolute permeability m2	list of number	Required
observedWaterCoreAreasM2	Observed water core areas m2	list of number	Required
observedWaterNetPotentialDropsPa	Observed water net potential drops pa; pressure or stress in pascals, with the sign convention described above.	list of number	Required

Require nonempty aligned water flow values in m³/s and positive viscosities, core lengths, absolute permeabilities, areas, and net potential drops in the stated SI units. Flow is finite signed input. Compute qμL/(kAbsolute A Δpotential) for each row, without clamping apparent relative permeability to [0,1].

kr_app=qμL/(k_absolute A Δpotential)

Read these symbols with the field meanings and branch or reference rules above.

Output field	Meaning	Value type
apparentObservedPhaseRelativePermeabilities	Apparent observed phase relative permeabilities	list of number

json

{
  "input": {
    "observedWaterPhaseFlowM3Second": [
      1,
      2
    ],
    "observedWaterPhaseViscosityPaSeconds": [
      1,
      1
    ],
    "observedWaterCoreLengthsM": [
      1,
      1
    ],
    "callerMatchedWaterAbsolutePermeabilityM2": [
      1,
      1
    ],
    "observedWaterCoreAreasM2": [
      1,
      1
    ],
    "observedWaterNetPotentialDropsPa": [
      2,
      4
    ]
  },
  "output": {
    "apparentObservedPhaseRelativePermeabilities": [
      0.5,
      0.5
    ]
  }
}

Limitations and assumptions

Measurements, unit conventions, branch identity, and model applicability must be independently established. The result does not infer a complete reservoir or flow model, operational settings, or a reserve classification.

Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected. Arrays must be dense, with no missing cells. Numeric lists allow at most 10000 entries, subject to smaller tool-specific bounds above.

Alternative or Complementary methods

For a related task, use Petroleum Relative Permeability Kro Calculator: Relative permeability compares a phase’s effective flow capacity with an independently measured absolute permeability. This oil tool inverts matched core-flow observations and retains signed or above-one apparent results for review. For a complementary step, use Petroleum Fractional Flow Fw Calculator: Two-phase fractional flow under a no-gravity, no-capillary-gradient branch divides each phase mobility by total mobility. This calculator uses independently matched relative permeabilities and viscosities rather than treating a supplied saturation as flow fraction.

References

Petroleum Relative Permeability Krw Calculator — tool.io

Similar or alternative tools

Petroleum Relative Permeability Kro Calculator
Relative permeability compares a phase’s effective flow capacity with an independently measured absolute permeability. This oil tool inverts matched core-flow observations and retains signed or above-one apparent results for review.
Petroleum Fractional Flow Fw Calculator
Two-phase fractional flow under a no-gravity, no-capillary-gradient branch divides each phase mobility by total mobility. This calculator uses independently matched relative permeabilities and viscosities rather than treating a supplied saturation as flow fraction.