Abstract
ABSTRACT The low perforation efficiency in many gravel pack completions suggests that current technology used in these completions could be improved. A full-scale, high-pressure visual wellbore model has been built to study the gravel packing process. This 100 ft long model is capable of operating at pressures up to 1,000 psi. It has 280 perforations over a 35 ft zone to accurately simulate a typical 500 md Gulf Coast well. Excellent reproducibility has been obtained with the model. Model experiments show that the circulating/squeeze pack method performs better than the squeeze method, and that standard HEC carrier fluid is superior to crosslinked CMHEC. As reported by other investigators, highly deviated wells are more difficult to pack than vertical wells. End effects observed in this model show that conclusions drawn from shorter models could be highly erroneous.
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