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Darcy Radial Flow Drawdown & Productivity Index Calculator

Easily calculate and compute darcy radial flow drawdown & productivity index calculator with accurate equations, live formulas, and expert guidance.

Absolute reservoir rock permeability in millidarcies.

Productive reservoir formation thickness.

Shut-in static drainage area pressure.

Dynamic flowing pressure at perforations.

Reservoir condition dynamic viscosity.

Ratio of reservoir barrels to stock tank barrels.

Drainage boundary outer radius (e.g. 40-acre spacing = ~745 ft, 80-acre = ~1050 ft).

Wellbore radius (e.g. 8.5" hole = 0.354 ft).

Wellbore formation damage (s > 0) or stimulation (s < 0).

Calculated Result
1,261.9 STB/d

Oil Production Rate

Oil Production Rate

1,261.9 STB/d

Oil Production Rate Stb D

1261.9

Productivity Index Pi Stb D Psi

1.68

Drawdown Pressure Psi

750

Flow Efficiency Percent

78.3

1,261.9 — STB/d

Calculation Breakdown

  1. Applied FormulaModels pseudo-steady state radial inflow performance relationships (IPR), drawdown, and productivity index (PI) for oil wells in cylindrical drainage compartments.q = \frac{2\pi k h (P_e - P_{wf})}{\mu B [\ln(r_e/r_w) - 0.75 + s]}, \quad J = \frac{q}{\Delta P}

Darcy Well Productivity Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.03156319461.3kOil Production Rate

What Is the Darcy Radial Flow Drawdown & Productivity Index Calculator?

This tool computes darcy radial flow drawdown & productivity index calculator with high precision arithmetic.

How Does the Darcy Radial Flow Drawdown & Productivity Index Calculator Work?

Models pseudo-steady state radial inflow performance relationships (IPR), drawdown, and productivity index (PI) for oil wells in cylindrical drainage compartments.

Darcy Radial Flow Drawdown & Productivity Index Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

q=2πkh(Pe−Pwf)μB[ln⁡(re/rw)−0.75+s],J=qΔPq = \frac{2\pi k h (P_e - P_{wf})}{\mu B [\ln(r_e/r_w) - 0.75 + s]}, \quad J = \frac{q}{\Delta P}

Models pseudo-steady state radial inflow performance relationships (IPR), drawdown, and productivity index (PI) for oil wells in cylindrical drainage compartments.

How to Use the Darcy Radial Flow Drawdown & Productivity Index Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Darcy Radial Flow Drawdown & Productivity Index Calculator Example

Input Values:

permeabilityKMd:85.0
netPayThicknessHFt:45.0
averageReservoirPressurePsi:3400.0
flowingBottomHolePressurePwfPsi:2650.0
oilViscosityCp:1.4
formationVolumeFactorBo:1.25
drainageRadiusReFt:990.0
wellboreRadiusRwFt:0.35
skinFactorS:2.0
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required STB/d.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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