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eng.Darcy-reservoir-flow Calculator
Calculates oil or gas flow rate from a reservoir using Darcy's law for single-phase flow through porous media. Darcy's law (q = kA ΔP / μL) is the fundamental equation for reservoir flow — permeability in millidarcies is the key rock property.
Inputs
K Md
Reference formula or conversion factor shown for context.
H M
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Delta P Mpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Mu Cp
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
R E M
Distance from centre to edge of a circle. Radius = diameter / 2.
R W M
Distance from centre to edge of a circle. Radius = diameter / 2.
Results
flow rate Q (m³/s)
Flow rate Q — the volume of fluid passing a point per unit time.
flow rate (bbl/day)
The value at the specified point or condition.
skin factor = 0 (assumed)
A dimensionless multiplier applied in the calculation.
ln(re/rw)
Sample size or count used in the calculation.
Q = 2πkh·ΔP / (μ·ln(re/rw))
Sample size or count used in the calculation.
productivity index PI (m³/s/MPa)
The result of multiplying all input values together.