Straight-line slope of a build-up or drawdown curve
Slope m of the semilog straight line of a pressure build-up (+) or drawdown (−) curve, in psi per log cycle.
m = C × q × B × μ / (k × h)Inputs
You can change a field's unit: the value is converted to the formula's units automatically.
Unit converter for this formulaLiquid rate · Oil formation volume factor · Viscosity · Permeability · Length · Semilog slope
- m³/d1
- m³/h0.0416667
- L/s0.0115741
- L/min0.694444
- m³/min0.000694444
- bbl/d6.28981
- Mbbl/d0.00628981
- ft³/d35.3147
- US gpm0.183453
- bbl/min0.00436792
A day is 24 hours.
More in Build-up and drawdown
Skin factor from the semilog straight line of a pressure build-up curve.
Skin factor from the semilog straight line of a pressure drawdown curve.
Slope m of the semilog straight line of a pressure build-up (+) or drawdown (−) curve, in bar per log cycle.
Transmissibility kh/μ, flow capacity kh and permeability from the slope of the semilog straight line of a build-up or drawdown (radial flow).
Effective producing time before a build-up from the cumulative production and the last rate, the Horner time ratio (t_p + Δt)/Δt for the plot axis, and Agarwal's equivalent time.
Results are engineering estimates from standard formulas; for design decisions check them against the codes, project documents and specialists' calculations. The formulas carried over from the original set are unchanged, and their errors are described in the notes.