Decline curve analysis
Paste a rate history and get an Arps fit — qi, Di and b — with the time to the economic limit, remaining reserves and an EUR.
Production & lift
ESP total dynamic head & stage count
Total dynamic head from net lift, tubing friction and discharge pressure, then the stages and shaft power that head implies.
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How it is calculated
- TDH = net lift (dynamic fluid level) + tubing friction head + discharge pressure expressed as head.
- Friction uses the Darcy friction factor from a Colebrook–White solution, not a nomograph — so viscosity and roughness actually move the answer.
- Stages = TDH / head per stage from the pump catalogue curve at your rate; shaft power = stages × power per stage × specific gravity.
- Pump intake pressure = casing pressure + fluid gradient × submergence.
Standards it speaks
Where this stops being true
Single-phase liquid only. Free gas at the intake is what actually limits most ESP installations, and it is not modelled here — below the bubble point the developed head collapses in a way no head-per-stage figure from a water curve will tell you. The head and power per stage are also water-curve values; a viscous crude degrades both, and above roughly 100 cp the correction is large enough that a catalogue curve is no longer usable without it.
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