Fifty-two completions made in the Gulf of Mexico between June 1978 and May 1982 have been analyzed to evaluate three commonly used techniques for perforating and cleaning up perforations before gravel packing. Since detailed flowing bottornhole pressure (BHP) information was not available in all cases, a method was developed to evaluate the completion efficiencies by using an inhouse computer program. This program models well performance by simultaneously solving the equations governing fluid flow in the reservoir, the near-wellbore region, the gravel-packed perforation tunnels, and up the production tubing. The results showed that perforating underbalanced with a tubing-conveyed casing gun yielded more efficient completions than the other two techniques.
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