Rod Pump Design Calculator

Design sucker rod pumping systems and calculate loads

Well & Pump Parameters

Enter well data and rod pump specifications

Depth to fluid level from surface

Design Considerations

  • Keep rod stress below 30,000 psi for Grade D
  • Use tapered string for deeper wells
  • Adjust SPM for well conditions
  • Consider gas interference effects

Rod Pump Design Results

Enter parameters and click Design Rod Pump

Formula Reference

Pump Displacement

PD = 0.1166 * D^2 * S * N * Eff Where: PD = Pump displacement (BPD) D = Plunger diameter (inches) S = Stroke length (inches) N = Strokes per minute Eff = Pump efficiency (fraction) 0.1166 converts in^3/min to BPD

Polished Rod Loads (API Method)

Fluid Load = 0.34 * D^2 * L * SG Where: D = Plunger diameter (inches) L = Fluid lift (pump depth - fluid level) (ft) SG = Fluid specific gravity Rod Weight = Rod weight per foot * Length * Buoyancy factor PPRL = Fluid Load + Rod Weight (buoyed) + Acceleration Load MPRL = Rod Weight (buoyed) - Acceleration Load

Counterbalance Effect (CBE)

CBE = (PPRL + MPRL) / 2 Ideal counterbalance equals CBE for: - Balanced pumping unit - Minimum power consumption - Even loading throughout stroke

Polished Rod Horsepower

PRHP = (Fluid Load * S * N) / 33000 Or using production: PRHP = (L * PD * SG) / 136000 Where: L = Lift (ft) PD = Production (BPD) SG = Specific gravity