P. E. Moseley and Associates, Inc, originated a concept where
surface data for perforating gun performance is converted to
downhole conditions as an integral part of the WEM program.
A proprietary Perforating Gun Database is incorporated that
includes an industry wide collection of guns with certified
API RP-43 or 19B test data. Guns suitable for a completion
are selected and the surface performance data are converted
to actual downhole conditions.
Downhole Gun Perforations: Phase Diagram
Analytical flow technology is used to determine the impediment
to flow resulting from the perforations created to establish
communication between the reservoir and wellbore. Well flow
is then determined by incorporating the influence of the tubing
and reservoir flow performance with various perforating strategies.
The optimum perforating strategy is determined by comparing
incremental flow rates with incremental cost and risk elements
associated with each procedure.
Downhole Gun Perforations: Phase Diagram
Coupling the gun performance and well performance technologies has
produced an extraordinarily powerful tool for optimizing perforated
completions. A wide spectrum of questions are easily addressed as
illustrated below:
Are the results from a premium charge justified over those expected
from standard charge performance?
Do well conditions dictate a deep penetrating charge over one with
a higher shot density?
Under what conditions will through tubing wire line conveyed
perforating compare favorably with tubing conveyed perforating?
Do well conditions favor multi-run wire line perforating at
underbalance conditions?
What is the best alternative for remedial perforating and will
the improved performance justify the expenditure and risk?
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