Productivity Index Calculation

Description

Calculate well productivity index (PI) and understand the impact of skin damage. Also shows drainage radius and effective wellbore radius calculations.

Key Relationships:

  • PI = kh / (141.2 * Bo * Uo * [ln(re/rw) + s])
  • Higher skin reduces PI (damaged well)
  • Negative skin increases PI (stimulated well)

Spreadsheet Preview

29 rows x 4 columns

Required Functions

PO.IPR.Rwa

Calculates effective wellbore radius, [ft].

PO.IPR.VW.PSS.PI

Calculates pseudosteady state productivity index for vertical well, [bbl/(D.psi)].

How to use this blueprint
  1. In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
  2. Search for Productivity Index Calculation
  3. Click on the blueprint to preview the spreadsheet template
  4. Click Insert to place it into your worksheet. Modify the input values to match your data.

Related Theory

Well Productivity Index

Productivity index calculations for vertical and horizontal wells under steady-state, pseudosteady-state, and transient flow conditions

Vogel Inflow Performance Relationship

Dimensionless IPR curve for solution-gas drive wells producing below bubble point pressure

Gas Well Deliverability

Darcy and non-Darcy gas flow equations for vertical gas well performance and deliverability testing

Well Flow Overview

Overview

Comprehensive guide to well inflow performance, productivity index calculations, and flow rate estimation for oil and gas wells

Related Blueprints

Flow Regime Comparison

Compare well productivity under different flow regimes: pseudosteady state (bounded reservoir), steady state (constant pressure boundary), and transient (infinite-acting). Understanding flow regime impacts is essential for accurate production forecasting.

Horizontal Well PI Comparison

Compare horizontal well productivity index calculations using different correlations. Useful for understanding the sensitivity of PI estimates to the chosen method.

Gas Well Deliverability

Gas well deliverability analysis comparing Darcy flow (low rate) with non-Darcy flow that includes turbulence effects at high rates. The non-Darcy coefficient D accounts for inertial resistance near the wellbore.

Vogel IPR Curve

Construct an IPR curve using the Vogel correlation for solution-gas-drive reservoirs producing below bubble point. Shows the characteristic concave-downward shape of two-phase flow.

Fetkovich IPR Curve

Construct an IPR curve using the Fetkovich backpressure equation. This empirical method works for both single-phase and two-phase flow by fitting well test data to Qo = C(Pr² - Pwf²)ⁿ.

Klins-Clark Modified Vogel IPR

Construct an IPR curve using the Klins-Clark (1993) modified Vogel equation. This correlation improves on the original Vogel method by introducing a pressure-dependent exponent d that accounts for the ratio of reservoir pressure to bubble point pressure.

Tags:
iprproductivityPIdarcyskindamage

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