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Perforation Erosion
Limited entry designs require a certain differential pressure across the
perforations to ensure that each zone accepts a proportionate amount of
fluid and proppant. During the limited entry treatment, perforations are
exposed to a proppant and liquid slurry. The effect of the sand is to
increase the discharge coefficient, CD , and the hydraulic
diameter of the perforation. The increase in the discharge coefficient can
be described as a rounding of the perforation.
The plot shows change in hydraulic diameter and pressure loss for
perforation erosion.
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