GAZ: P/z

Introduction

The P/z module performs static 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 GAZ Static P/z

Select the GAZ Static P/z module as shown below:

STEP 2: Select “Input Grid“

The input grid shows the primary variables used to calculate a Static P/z. Basic gas data andGas PVT Correlations are selected in this view. The basics are:

1. Initial (Reservoir) Pressure

2. Formation Temperature

3. Gas Specific Gravity

4. Gas impurities such as N2, CO2, and H2S.

5. Selection of the Gas Deviation Factor

STEP 3: “P/z Output“ Tab

In the image below, the steps are:

1. Enter newly obtained static pressures, and associated gas production in the table.

2. As data is entered, an automated line is generated providing a “Best Fit OGIP“

3. The “Best Fit OGIP“ is also shown in the plot.

STEP 4: Perform a Manual OGIP (Optional)

If the analyst would like to manually adjust the line, they can simply type a new OGIP in the “Manual Fit” box shown below. To perform a manual fit:

1. Manually enter a numerical value into the “Manual Fit“ box (in this example, a value of 6,000 MMscf, or 6 Bcf)

2. Observe a new line is shown on the graph representing the manual fit

3. Note, that the automated best fit line still exists.

See Also:

• Zooming & Resetting Plots

• Downloading Plots

• Downloading Tabulated Data