Edward Arthur Warren's report
by
Edward Arthur Warren, MSE
University of Texas at Austin, 1997
Supervisor: Dr. A.D. Hill
The quantitative interpretation of production logs is a time consuming
task requiring many repetitious mathematical calculations. Dedicated software
for more rapid interpretation in the possession of the service companies
performing the data acquisition is not widely available for public use.
A new integrated production logging software suite, SpinDoctor,
was developed for the quantitative analysis of production logs. Written
in Visual Basic 4.0, it operates within the spreadsheet, Excel, on both
Macintosh and PC computers. It enables rapid analysis of a wide variety
of productions log combinations including spinner, density, capacitance
and temperature logs and displays results automatically.
The software was tested on two example wells; first by application to
a single-phase oil production well in the Cusiana field, Colombia, then
by application to a more complex multiphase production well in the Endicott
Field, North Slope, Alaska. In both wells, fluid flow predictions matched
observed production rates to within 20%. Furthermore, the single-phase
flow profile closely mimicked the known permeability architecture of the
well completion.
The sensitivity of the interpretations to critical parameters was investigated
and quantified for the wells examined. The single-phase interpretations
appear most robust. The capacitance calibration was found to be a master
variable in multi-phase analysis which limits the accuracy of the calculated
results.
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