Petroleum Skin Factor Calculator
Named pseudo-steady radial drawdown inverse with natural-log geometry and.75 boundary constant, independently established pressure scale; signed apparent skin not causal damage diagnosis or transient Horner skin. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
Pseudo-steady radial skin is an additional pressure-loss term relative to a specific drainage-radius model.
Pseudo-steady radial skin is an additional pressure-loss term relative to a specific drainage-radius model.1
This calculator inverts a supplied pressure scale and geometry while retaining negative apparent skin.
When to use Petroleum Skin Factor 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 Skin Factor 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 observedWellDrawdownPa, callerMatchedRadialPressureScalePa, callerIndependentDrainageRadiusM, observedWellboreRadiusM, following the field table and calculation rules below, then run the tool.
- Read apparentPseudoSteadySkin. 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 |
|---|---|---|---|
| observedWellDrawdownPa | Observed well drawdown pa; pressure or stress in pascals, with the sign convention described above. | number | Required |
| callerMatchedRadialPressureScalePa | Caller matched radial pressure scale pa; pressure or stress in pascals, with the sign convention described above. | number | Required |
| callerIndependentDrainageRadiusM | Caller independent drainage radius m | number | Required |
| observedWellboreRadiusM | Observed wellbore radius m | number | Required |
Require nonnegative drawdown, positive radial pressure scale and radii, and drainage radius strictly larger than wellbore radius. Divide drawdown by scale, subtract natural log of radius ratio, and add the stated 0.75 boundary constant. No transient-test derivative is used.
skin=drawdown/pressureScale−ln(drainageRadius/wellboreRadius)+0.75 Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| apparentPseudoSteadySkin | Apparent pseudo steady skin | number |
{
"input": {
"observedWellDrawdownPa": 10,
"callerMatchedRadialPressureScalePa": 2,
"callerIndependentDrainageRadiusM": 100,
"observedWellboreRadiusM": 1
},
"output": {
"apparentPseudoSteadySkin": 1.1448298140119082
}
}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 Well Test Skin Calculator: Transient well-test skin describes additional drawdown relative to a matched zero-skin reference under a radial-flow convention. This tool computes signed apparent skin from supplied traces and natural-log derivatives, without diagnosing formation damage. For a complementary step, use Petroleum Well Test Permeability Calculator: A constant-rate radial pressure test can relate pressure slope against natural log of elapsed time to permeability. This tool fits independently selected radial observations and applies the SI pressure-slope relation using supplied fluid and well properties.
References
-
Petroleum Skin Factor Calculator — tool.io
Similar or alternative tools
- Petroleum Well Test Skin Calculator
Transient well-test skin describes additional drawdown relative to a matched zero-skin reference under a radial-flow convention. This tool computes signed apparent skin from supplied traces and natural-log derivatives, without diagnosing formation damage.
- Petroleum Well Test Permeability Calculator
A constant-rate radial pressure test can relate pressure slope against natural log of elapsed time to permeability. This tool fits independently selected radial observations and applies the SI pressure-slope relation using supplied fluid and well properties.