Daniel A. Krygowski, Warren J. Wahlstedt, Robert L. Colby
Cities Service Company, Denver, Colorado
ABSTRACT
A van-mounted Hewlett-Packard 9845T Desktop Computer, with two flexible disk drives and digitizer, is the basis for a wellsite log analysis system. The wide operating range of the computer and an onboard generator make the system self-contained and operable in extremes of weather. In addition, the system’s portability allows its removal from the van for office use.
The two flexible disks are used to store system programs, well data, and analytical results, and augment the 187 kilobytes of computer memory. Well logs may be digitized, check plotted using the graphics capabilities and thermal printer, and shifted for depth corrections. Manual entry of
data to supplement digitized logs is also possible. Well data can be analyzed by a combination of explicit equations and graphical techniques (cross-plots) with the results displayed in tabular or graphical log format. All system programs are interactive and allow a wide range of input and output choices as well as providing continuous operator instructions and prompting.
Although not yet implemented, the system has the capabilities of reading service company tapes (by the addition of an appropriate tape drive) and of communication over telephone lines to other machines for the rapid transfer of data from the field to regional offices.
Whether used for wellsite analysis or used exclusively in an office, the system is a powerful analytical tool with capabilities beyond those of hand held calculators. Because it is self-contained, it can be dedicated specifically to log analysis and can allow the log analyst the freedom and computational abilities for more complete analyses.