In GUPCO'S operations, different perforation types and techniques had been used for new completions, workovers, conversions and drill stem tests in Gulf of Suez and Western desert fields.

This paper presents a case study of Tubing Conveyed under-balance Perforating (TCP) jobs versus Through Tubing Perforation (TTP) jobs and Casing gun perforation jobs conducted in GUPCO'S fields during the period from January 1980 until April 1991.

In the past the conventional over-balance perforating types, TTP (Through Tubing) and Casing perforations, were being used in all perforation jobs performed till late 1983. In October 1983 the under-balance tubing conveyed perforating technique was used for the first time in the well M-107 in E1 Morgan field. As a result, the well was produced 7500 BFPD with 6% W.C. Then the TCP applications increased sharply and become the most usable perforation type today.

The perforation job is the most important step in the well completion as it represents the last portion of the reservoir inflow. Consequently, it directly affects the well productivity.

The determination of the proper perforation type and technique will results in both cost savings and improving well productivity.

This paper documents only those perforation jobs performed utilizing rigs including new completions, recompletions, conversions and workovers. More than 1600 rig jobs were performed during the period from January 1980 until April 1991. Out of these jobs, 993 perforation jobs were conducted and will be analyzed in this paper.

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