GAZ: autoFMB

Introduction

FMB is short for Flowing Material Balance .

AFA requires at least 1 Project and 1 Group to perform any analyses or simulation. Please refer to Create a Project and sub-topics if required.

STEP 1: Select the GAZ autoFMB

The gas FMB is part of the GAZ series of modules as shown below:

STEP 2: Data View

Data View is the first tab in most modules. It shows all the major data sources imported for this well (pressures, rates, etc). Some specific items are:

1. Options to select which axis a data set below (left or right)

STEP 3: Input Tab

The user must specify all the PVT and rock properties shown below to proceed to the analysis or “Analysis“ tab. On this tab, there are:

STEP 3.1 Defined Parameters

These are initial pressure,

1. Net Pay

2. Porosity

3. subsurface temperature

4. Rock & Formation Compressibility etc. as shown below.

STEP 3.2 Model Components

Model Components is made up off 3 major components

1. Gas, Water, and Oil PVT

2. Langmuir Isotherm . Refer to autoRTA: Langmuir Isotherm for the workflow.

3. Wellbore Model.

In the example below, the user has selected the Gas PVT Tab. The display panel shows all the required inputs for that tab. The same will occur if you select any of the other remaining tabs.

STEP 3.2.1 Wellbore Model

Refer to autoRTA: Wellbore Model as the workflow is the same for all transient model, both oil and gas.

STEP 4: Analysis Tab

The Analysis tab allows the user to perform the actual analysis. There are four (4) main components to autoFMB tab:

4.1 FMB Results

1. Smart-Fit Option - Default status is on. Using data science three full FMB’s are performed to provide low, medium, and high estimates.

2. Drainage Area and Permeability results from automaton

3. OGIP and volumetric results from automation.

   1. Stabilization time is also displayed which represents the time to Boundary Dominated Flow.

4. Plot of FMB results

5. FMB P/z Plot (5a and 5b)

6. FMB: Productivity Index Plot

4.2 Data Table of Results

Simply a tabulation of results for all three analyses. You can select to view any sensitivity low, medium or high .

STEP 5: Forecast Tab

The forecast tab simply generates a forecast past the history match period. It contains

1. The Economic Cut-off

2. Summary of results

3. Display of history match and forecast sensitivities (see RTA Sensitivities )

See Also:

Further Reading:

• Zooming & Resetting Plots

• Downloading Plots

• Downloading Tabulated Data