Petroleum Mobility Ratio Calculator
Evaluate independently matched displacement-front phase mobility ratio, not permeability-independent viscosity ratio or fractional-flow complement; no stability/fingering forecast. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
Mobility combines relative permeability and viscosity under a matched displacement-front basis.
Mobility combines relative permeability and viscosity under a matched displacement-front basis.1
This calculator compares the displacing phase’s mobility with that of the displaced phase rather than using viscosity ratio alone.
When to use Petroleum Mobility Ratio 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 Mobility Ratio 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 callerDisplacingRelativePermeability, observedDisplacingViscosityPaSeconds, callerDisplacedRelativePermeability, observedDisplacedViscosityPaSeconds, following the field table and calculation rules below, then run the tool.
- Read callerMatchedFrontMobilityRatio. 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 |
|---|---|---|---|
| callerDisplacingRelativePermeability | Caller displacing relative permeability | number | Required |
| observedDisplacingViscosityPaSeconds | Observed displacing viscosity pa seconds | number | Required |
| callerDisplacedRelativePermeability | Caller displaced relative permeability | number | Required |
| observedDisplacedViscosityPaSeconds | Observed displaced viscosity pa seconds | number | Required |
Require both viscosities positive and both relative permeabilities in [0,1], with displaced relative permeability strictly positive. Divide displacing kr/μ by displaced kr/μ. Zero displacing kr yields zero; the returned ratio can exceed one.
M=(krDisplacing/μDisplacing)/(krDisplaced/μDisplaced) Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| callerMatchedFrontMobilityRatio | Caller matched front mobility ratio | number |
{
"input": {
"callerDisplacingRelativePermeability": 0.4,
"observedDisplacingViscosityPaSeconds": 1,
"callerDisplacedRelativePermeability": 0.8,
"observedDisplacedViscosityPaSeconds": 2
},
"output": {
"callerMatchedFrontMobilityRatio": 1
}
}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.
Alternative or Complementary methods
For a related task, 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. For a complementary step, use Petroleum Relative Permeability Krw Calculator: Relative permeability compares a phase’s effective flow capacity with an independently measured absolute permeability. This water tool inverts matched core-flow observations and retains signed or above-one apparent results for review.
References
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Petroleum Mobility Ratio Calculator — tool.io
Similar or alternative tools
- 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.
- Petroleum Relative Permeability Krw Calculator
Relative permeability compares a phase’s effective flow capacity with an independently measured absolute permeability. This water tool inverts matched core-flow observations and retains signed or above-one apparent results for review.