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
Rates, water cut, GOR & uptime
Gross to net, cut to WOR, gas rate to GOR, and on-stream rates to calendar-day rates — the arithmetic every production report repeats and half of them get wrong.
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How it is calculated
- Oil = gross × (1 − water cut); water = gross × water cut; WOR = water/oil.
- GOR = gas (scf/d) / oil (STB/d); GLR uses gross liquid instead.
- Calendar-day rates are on-stream rates multiplied by uptime — the number a yearly figure has to be built from.
- Net oil applies the shrinkage between the test separator and the sales tank.
Standards it speaks
Where this stops being true
A well test is one measurement of a well that changes hour to hour. Multiphase meters drift, test separators need a stable well to be accurate, and a cut measured on a slugging well depends entirely on when in the slug the sample was taken. Nothing here reconciles to an allocated figure — that is a field-wide calculation, and if this number and the allocation disagree, the allocation is what gets invoiced.
Related tools
IPR curve
One well test turned into an inflow performance curve, a productivity index and an absolute open flow.
Gas-lift injection optimisation
Fit a gas-lift performance curve through your injection tests and find both the technical peak and the point where the next MSCF stops paying for itself.
Static gradient & bottom-hole pressure
Bottom-hole pressure from a wellhead reading — a liquid gradient for oil and water, and a stepwise gas-column integration for gas.