Análisis de curvas de declinación
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.
Producción y levantamiento
Curva IPR
One well test turned into an inflow performance curve, a productivity index and an absolute open flow.
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Cómo se calcula
- Straight-line PI: q = J(P̄ − Pwf), valid while the whole drainage area stays above the bubble point.
- Vogel: q/qmax = 1 − 0.2(Pwf/P̄) − 0.8(Pwf/P̄)², for a saturated reservoir.
- Composite: a straight line above the bubble point and Vogel below it, joined at qb = J(P̄ − Pb) so the curve and its slope are continuous.
- J is back-calculated from the test point under the model you choose, not assumed.
Estándares que habla
Dónde deja de ser cierto
One test point fixes one constant, so the shape of the curve is entirely the model you picked — two models through the same test point can differ by thirty per cent at high drawdown. It is also a snapshot: reservoir pressure falls with depletion, skin changes with every job, and an IPR built on a test from last year describes last year. Multi-rate tests exist precisely because a single point cannot distinguish between a low PI and a high one with turbulence.
Herramientas relacionadas
Optimización de inyección de gas lift
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.
Gradiente estático y presión de fondo
Bottom-hole pressure from a wellhead reading — a liquid gradient for oil and water, and a stepwise gas-column integration for gas.
Prueba de restauración — permeabilidad y daño
A Horner plot from your shut-in pressures, with the semilog slope turned into permeability, skin, p* and flow efficiency.