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Evaluation and correlation analysis are the part of Comprehensive SWT-GUARANT service. Completion of these
steps will allow designing the SWTorpedo Tool and the stimulation services to be cost-effective.
The necessary steps:
1. Capacity of the formation rock to dilate
2. Desired production increase
3. Probabilities of permeability increase
If the necessary minimum of production increase for stimulation to be cost-effective is  and
capacity of the given formation’s rock to dilate is determent then effective radius of the well after
stimulation should become such that following equation will be true:
From which:
and
According to the geometrical similitude theory effective radius of the well must be:
 =
 
and
 =
-
Where:
- is targeted or expected well production
- is current well production
- is required increase in output of the well
- is projected effective radius of the well
- is the actual radius of the well
- is influential radius of the well
- is radius of the radial fractures that can be created
in the rock mass
- is the zone of dilatancy, it creates natural extension
of radial fractures
( )
- is proportionality factor
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