Ryder Scott Company Petroleum Consultants Material Balance Freeware

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Material balance freeware downloadable from Web site
Program used by Ryder Scott automatically calculates OGIP

Material Balance Screen

Using this template, a user can compute BHP/z vs. cumulative gas production and graph the relationship in presentation-quality, hard-copy output. A user can enter up to 400 data points in the template.

PC users can now download a conventional gas material-balance program previously developed and used exclusively by Ryder Scott. They need Microsoft Excel ’97 software and a file-decompression program.

Those interested in finding out more about the application or in getting the password to enable the program need to fill out the download form, or contact Ryder Scott engineer James Latham at 713-651-9191, ext. 212. You may also email him at james_latham@ryderscott.com. Ryder Scott plans to offer other utility-software programs on a quarterly basis that can be downloaded from the firm’s web site at no cost.

The material-balance application automatically calculates original gas in place (OGIP) and estimated ultimate recovery (EUR) based on user-specified criteria.

Latham developed the program this year to automatically compute BHP/z vs. cumulative gas production and graph the relationship in black-and-white or color, presentation-quality, hard-copy output. Ryder Scott currently uses the application extensively.

"It’s fast, convenient and easy to use. It’s an ideal computer application, because it automatically generates results that would otherwise be time consuming to hand calculate," Latham said. Once loaded, a user can enter up to 400 data points in the template. The program automatically calculates pseudocritical-temperature (Tc) and pseudocritical-pressure (Pc) properties from gas gravity while adjusting for contaminants. Using the popular Cullender-Smith (1956) method as modified by Latham, the utility software also predicts shut-in bottomhole pressures from tubing pressures in gas wells. Additional features include automatic loading of the menus and macros for ease of use and an override function so certain calculated results can be changed manually.

Once the user has downloaded the program from the web site, they will need to unzip the file using Winzip or another decompression program and read the installation instructions in an installpzcum.txt file. Installation is simple and involves loading files in the Excel start directory. Also, the user will be able to print and read a downloaded Excel document that serves as the user manual.

"I would advise our audience to please stay tuned to the web site and newsletter for other offerings," said Latham, who has designed other programs scheduled for release over the Ryder Scott web site.

Editor's Note: Ryder Scott does not guarantee or warrant the accuracy or reliability of this software.

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