Production EngineeringWell Performance
Polished Rod Horsepower - Sucker Rod Pump Formula
Polished Rod Horsepower - Sucker Rod Pump calculates polished rod horsepower for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (C, A_card, L, S, N) are known and the assumptions behind the cited well performance relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, PRHP equals 2.020202 hp.
Clb/in
200
A_cardin2
20
Lin
5
Sin
100
Nspm
10
Inputs
C
lb/inDynamometer Calibration Constant
A_card
in2Upper Area of Dynamometer Card
L
inLength of Dynamometer Card
S
inMaximum Theoretical Polished Rod Position
N
spmPump Speed
Outputs
PRHP
hp
Polished Rod Horsepower
C
lb/in
Dynamometer Calibration Constant
S
in
Maximum Theoretical Polished Rod Position
N
spm
Pump Speed
Source and review
reviewedGuo, B., Lyons, W.C. and Ghalambor, A. 2007. Petroleum Production Engineering: A Computer-Assisted Approach, Page 18.
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