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Title: A Review Of Adding Perforations Shots( Per Foot) To Existing Injection/Withdrawal Wells And Using 12 Shots Per Foot To Newly Drilled Wells
Author: Walter m. Rzepczynski, Donald L. Bielecki
Source: American Gas Association 1992
Year Published: 1992
Abstract: Due to late season daily dehverability reductions in many of NGPLs storage reservoirs, it was obvious something had to be done to the existing wells to prevent this occurrence. Some acidization of wells took place but the results were not significant. The Company also did some fracing of wells many years ago, and it also was not a remedy and was considered a dangerous practice which could bring on more problems. Infill drilling could help provide additional late season deliverability but it was not conducive to most of the 13 storage reservoirs. The only remaining alternative was to review how most or all of the existing wells were completed and see if additional gas footage could be perforated or reperforate the existing pay zones by adding more shots per foot. Typically most wells were perforated with the conventional 4 shots per foot (every 3). This was a standard practice and was accepted by most of the industry. It was believed more shots per foot were unnecessary, in fact hinderous to the well casing. A recent study shows no significant reduction in casing collapse resistance in wells shot up to 16 shots per foot with a spiral or sequential patterns (SPE Paper 18843).

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