Effect of void and filled perforations on well productivity
Conference
·
OSTI ID:7325127
Numerical simulation using cylindrical coordinates provides a powerful technique for analyzing the fluid flow behavior in the formation immediately adjacent to production and injection wells. This technique was used to study the effect of both void and filled (gravel-packed) perforations on well productivity. The results indicate that perforating (even without formation damage) causes a more severe level of impairment than heretofore recognized. We found in both the void and filled (gravel-packed) perforation cases that radial flow does not occur as close to the wellbore as previous investigators have assumed. This larger than previously expected non-radial flow region will create a skin or damage effect. In the case of filled perforations, permeability of the gravel pack or perforating debris has a very large influence on productivity. Results appearing in the literature concerning productivity through perforated casing (all of which assume the perforation has an empty cavity) are unduly optimistic when applied to unconsolidated reservoirs.
- OSTI ID:
- 7325127
- Report Number(s):
- CONF-761008-162
- Country of Publication:
- United States
- Language:
- English
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