Introduction

P/Z is a software program that allows you to quickly import or link to gas well data from leading data sources and calculate gas material reserves for single or multi-well pools. Results may be plotted or printed to any Windows compatible printer.

P/Z's current features enable the user to:

• Maintain a permanent and up to date database of all the production history and pressure data for your company wells.
  
• Use our integration with IHS Energy (AccuMap) and Divestco, (GeoCarta, or MSI Capture) mapping systems to automatically launch DECPRO and pass the selected wells to them for viewing and analysis.
  
• Retrieve wells from within the database by location, field, pool and unit code and create well groups for future use.
  
• Interactively exclude single data points in a well on screen or add or remove wells from the multi-well pools during analysis.
  
• Quickly toggle between pool and individual well gas material balance plots.
  
• Highlight and view an individual well pressure history in a multi-well pool.
  
• Add new pressure analysis information into the P/Z database as soon as it becomes available.
  
• Automatically calculate and display best-fit line on the P/Z versus cumulative production graph.
  
• Define the pool recoverable reserves by specifying the abandonment pressure or a recovery pressure. For whichever one you choose, P/Z will calculate the other one.
  
• Use automatically imported government pool reservoir properties or create custom reservoir property dataset for gas material analysis calculations.
  
• Save up to five user-defined best-fit lines in a Fit Menu and select any one current to be current.
  
• View on-screen the production split of any well in the group for up to five user-defined time periods.
  
• Plot up to three production series on the pressure-time plot, including daily gas rate, cumulative gas production, or water-gas ratio.
  
• Data for all wells may be edited at any time.
  
• Open the Pressure Table report to view all the pressure data for the currently selected wells.

Special Evaluation Features

P/Z has a number of features that will assist the user in performing a P/Z gas reserves evaluation. These key features are described below.

• P/Z will alert the user if the selected wells in multi-well pool are from more than one pool and the reservoir gas properties or datum depths are different.
  
• If more than one pool is found, the user will be asked to select which pool gas properties and datum elevation to use in the evaluation and P/Z will correct all pressures to the defined datum depth.
  
• P/Z will allow the user to open the pressure versus time, P/Z versus cumulative production and the raw pressure data windows concurrently.
  
• P/Z will automatically look for gas injection in all the selected wells and, if found, will adjust the cumulative production to be cumulative production less cumulative injection.
  
• The user will be allowed to draw up to five user defined P/Z analyses on the material balance graph for any multi-well group. This feature will allow the user to establish a range of gas reserves and select the most appropriate value.

Sources of Data

Data may be input into P/Z in the following ways:

• Import production data using conventional export formats from Petro-Soft, IHS ENERGY (AccuMap, International Petrodata, QC Data and Dwight’s US), Divestco, and geoLOGIC.
  
• Use GIS mapping systems to select wells for viewing and obtain the well information from transparent links to PPDM databases stored on internal computer networks and/or remote data centres.
  
• P/Z contains a facility for directly inputting wells pressure data, gas properties and monthly production data for the wells if an electronic source of data is not available.
  
• Corporate SQL Server database users may wish to access their own production data. Petro-Soft Systems will work with these users to develop an SQL interface for their specific environment.

Well Selection

P/Z contains a well selection window that allows the useryou to select wells by from all wells in the database or any user-defined group of wells using a variety of well criterion. The search criteria includes:

• Well field, pool unit or operator codes.
• Province/State
• Primary product status
• On-production date
• Wells with temporary or permanent forecasts.

The selected wells may then be saved as a group in the database for current to later use. During interpretation, individual wells may be added or removed from the group and P/Z will automatically recalculate the cumulative production and gas reserves.

Reports and Plots

The user may print the material balance and pressure-time graphs of raw or analyzed data on any Windows compatible printer. Both of these graphs can be supplemented with additional user-defined headings, well lists and pressure data. The material balance graph can also be formatted to output the well production split information alone with the list of wells. The pressure table report can be printed or exported in *.csv or *.txt formats.