Petroleum Displacement Efficiency Calculator
Audit actual pore-weighted core initial/residual oil displacement, signed apparent losses retained; not sweep contact fraction or reservoir-wide recovery guarantee. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
Displacement efficiency compares removed oil with the oil initially present in assessed core pore volume.
Displacement efficiency compares removed oil with the oil initially present in assessed core pore volume.1
This calculator weights measured initial and residual saturations by pore volume and retains negative apparent displacement when residual exceeds initial.
When to use Petroleum Displacement Efficiency 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 Displacement Efficiency 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 observedInitialOilSaturations, observedResidualOilSaturations, observedMatchedCorePoreVolumesM3, following the field table and calculation rules below, then run the tool.
- Read poreWeightedObservedDisplacementEfficiency. 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 |
|---|---|---|---|
| observedInitialOilSaturations | Observed initial oil saturations | list of number | Required |
| observedResidualOilSaturations | Observed residual oil saturations | list of number | Required |
| observedMatchedCorePoreVolumesM3 | Observed matched core pore volumes m3 | list of number | Required |
Require nonempty aligned initial/residual fractions in [0,1] and positive core pore volumes. Sum initial saturation times volume and require the total positive. Divide the sum of (initial−residual) times volume by that initial-oil total; no per-core efficiency averaging or clamping occurs.
efficiency=Σ(Sinitial_i−Sresidual_i)V_i/ΣSinitial_i V_i Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| poreWeightedObservedDisplacementEfficiency | Pore weighted observed displacement efficiency | number |
{
"input": {
"observedInitialOilSaturations": [
0.8,
0.6
],
"observedResidualOilSaturations": [
0.2,
0.3
],
"observedMatchedCorePoreVolumesM3": [
1,
2
]
},
"output": {
"poreWeightedObservedDisplacementEfficiency": 0.6000000000000001
}
}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 Volumetric Sweep Efficiency Calculator: Volumetric sweep measures the contacted fraction of a three-dimensional pore-volume inventory. This tool pools assessed cells and bounds the effect of unknown cells, without multiplying unrelated areal and vertical percentages. 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
Similar or alternative tools
- Petroleum Volumetric Sweep Efficiency Calculator
Volumetric sweep measures the contacted fraction of a three-dimensional pore-volume inventory. This tool pools assessed cells and bounds the effect of unknown cells, without multiplying unrelated areal and vertical percentages.
- 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.