Effect of Well Completion on Acid Etched Wormhole Propagation

doi:10.11885/j.issn.1674-5086.2012.07.25.01

Abstract

Abstract:

In carbonate acidizing，different completion methods have different effects on dissolution patterns caused by acidization.
In this paper，we use a normal distribution function to generate initial porosity values and a two-scale continuum model
to study the effects of perforation completion on dissolution patterns and analyze the effect of leakoff along the aperture. The
results show that the dissolution pattern is very different from that of openhole completion. Acid flows into the formation
through perforation tunnel，and the number of wormhole branches increases with the decrease of perforation length. Under the
same injection velocity，the breakthrough volume of perforation completion without leakoff along the aperture is the least and
that of open-hole completion is the most. Completion and leakoff rarely have effects on the optimum injection velocity. At
small injection velocity，the inlet pressure declines sharply in the termination regime because of a very small distance between
reaction front and spent acid front；at large injection velocity，the inlet pressure declines slowly due to the wide reaction front.

Key words: completion, carbonate, wormhole propagation, dissolution pattern, leakoff

Liu Ming1，2, Yang Peng1, Li Dequan3, Zhang Shicheng2, Mou Jianye2. Effect of Well Completion on Acid Etched Wormhole Propagation[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.07.25.01.

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