Decline Diagnostics Analysis

Description

Diagnostic analysis for decline curve interpretation using derivative-based methods. These tools help identify flow regimes and validate decline model selection.

Diagnostic Functions:

  • Bourdet Derivative: Smoothed rate derivative for flow regime identification
  • Beta Parameter: β = t × D identifies decline type (linear, radial, etc.)
  • b(t) Parameter: Time-varying b-factor shows transition from transient to BDF
  • D(t): Instantaneous decline rate

Spreadsheet Preview

38 rows x 6 columns

Required Functions

PO.DCA.Diag.Bourdet

Calculates the Bourdet (smoothed) derivative at point t. Used for flow regime identification and production diagnostics.

PO.DCA.Diag.Beta

Computes the beta diagnostic β = t×D(t) for flow regime identification. β≈0.5: linear flow, β≈0.25: bilinear, β≈1.0: boundary-dominated.

PO.DCA.Diag.bParam

Computes the time-varying Arps b-parameter. b=0: exponential, 0<b<1: hyperbolic, b=1: harmonic, b>1: transient (unconventional).

PO.DCA.Arps.D

Calculates instantaneous decline rate D(t) for Arps decline, [1/T]. D(t) = Di/(1+b×Di×t). Computed numerically.

How to use this blueprint
  1. In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
  2. Search for Decline Diagnostics Analysis
  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

Arps Decline Curve Analysis - Exponential, Hyperbolic, and Harmonic Models

Complete theory and equations for classical Arps decline curves including exponential, hyperbolic, and harmonic models for production forecasting and EUR estimation.

Ansah-Knowles-Buba (AKB) Decline Model

Semi-analytical decline model for gas wells under boundary-dominated flow, derived from material balance principles

Decline Curve Statistics

Objective functions for evaluating decline curve model fit quality including SSE, log-space SSE, and weighted variants

Field Production Profiles

Aggregate production modeling for multi-well field development using parametric and discrete convolution approaches

Related Blueprints

EUR Sensitivity Analysis

Sensitivity analysis of Estimated Ultimate Recovery (EUR) to Arps decline parameters. Understanding parameter uncertainty impact on EUR is critical for reserves estimation and economic analysis.

EUR Calculator

Calculate Estimated Ultimate Recovery (EUR) for different economic limits and decline parameters. Essential for reserves estimation and economic analysis.

Modified Hyperbolic Decline

Modified Hyperbolic decline model that transitions from hyperbolic to exponential decline at a specified terminal decline rate. This addresses the unrealistic EUR predictions from pure hyperbolic decline with high b-factors.

Arps Decline Forecast

Decline curve analysis using the Arps hyperbolic decline equation. Calculates rate and cumulative production over time for production forecasting.

Duong Decline Forecast

Decline curve forecast using the Duong model, specifically designed for unconventional reservoirs exhibiting transient linear flow. The Duong model captures the power-law behavior common in tight oil and shale gas wells.

Decline Model Comparison

Compare multiple decline curve models for the same well. Different models may be more appropriate depending on reservoir type and flow regime. Arps is standard for conventional, Duong for unconventional transient, and PLE for tight/shale.

Tags:
declinediagnosticsbourdetderivativebetab-factorflow regime

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