Production engineering / Offline review
Work through the numbers.
Keep the assumptions visible.
Review declining production with a time-separated check, or compare water injection with the volume withdrawn from a reservoir.
CONDITIONAL ANALYTICAL WORKSHEET · NO FIELD QUALIFICATIONSurface production + declared PVT → volume balance.
Neither a balance nor a decline fit diagnoses reservoir health.
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—Training history
—Held-out rate error
—Future scenario
Production history and frozen fit
What this result depends on
| Model | Training fit | Validation error | Review |
|---|
Full result, assumptions and input hash
Use the review to frame a question. These conditional analytical models do not establish reserves, well integrity, reservoir pressure, injector connectivity, safe gas-lift settings or permission to change production. Sensor calibration, site allocations and field acceptance require independent evidence.
Production decline
Fit early history only. Keep later data out of parameter selection. Retain error and declining-fit failures before showing future throughput scenarios.
Separate production-event model: failed transfer reportWaterflood volume balance
Convert oil, water and free gas to reservoir volume using declared formation-volume factors. Missing PVT or conflicting production allocation stops the calculation.
A volume ratio is separate from pressure support, sweep efficiency and fluid breakthrough.