The giant Arun gas field located in Aceh province on the island of Sumatra in Indonesia has been producing gas and condensate since 1977. Average annual gas production has increased since start-up to the current level of 3,260 million standard cubic feet per day (MMSCFD). Of this total average daily volume; 2,250 MMSCFD is transported to the LNG plant for liquefaction and export, 125 MMSCFD is sold to local industries, 45 MMSCFD is used for fuel in the field and 840 MMSCFD is reinjected into the reservoir to maximize condensate recovery. The field is now at a level where new challenges must be addressed. This paper discusses Mobil Oil Indonesia Inc.'s (Mobil) efforts and strategies in maintaining field production in the face of declining well deliverability, pressures and surface temperatures.

Arun field development plans are focused on increasing or maintaining field deliverability through processing facility improvements and additions. Well facilities are being modified to lower wellhead pressures. Major new projects in this area include facility debottle-necking, well stream dehydration and booster compression. For improved well performance, Mobil is implementing projects on stimulation, additional drilling and big bore (9-5/8"tubing) well completions based on comprehensive reservoir simulation studies.

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