Duong Decline Forecast

Description

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.

Parameters:

  • qi: Initial production rate
  • a: Decline constant (typically 1.0-2.0)
  • m: Decline exponent (typically 1.0-1.5)
  • q_inf: Infinite time rate (often set to 0)

Spreadsheet Preview

27 rows x 4 columns

Required Functions

PO.DCA.Duong.Rate

Calculates rate using Duong decline model, [L3/T]. Units of volume [L3] and time [T] must be consistent.

PO.DCA.Duong.Prod

Calculates cumulative production using Duong decline model, [L3]. Units of volume [L3] and time [T] must be consistent.

PO.DCA.Duong.EUR

Estimated Ultimate Recovery (EUR) to an economic rate limit for Duong decline, [L3].

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

Duong Decline Model for Unconventional Wells

Theory and equations for the Duong decline model designed for multi-fractured horizontal wells in shale and tight reservoirs with extended linear flow.

Power Law Exponential (PLE) Decline Model

Theory and equations for the Ilk et al. Power Law Exponential decline model for tight gas and unconventional reservoirs, capturing transient-to-BDF transition.

Stretched Exponential Production Decline (SEPD) Model

Theory and equations for the Valkó-Lee Stretched Exponential decline model based on statistical physics, ideal for shale and unconventional reservoir analysis.

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

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.

Arps Decline Forecast

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

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.

EUR Calculator

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

Tags:
declineduongunconventionalshaletightforecast

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