Following discovery of the Aran Gas Field in 1971 and subsequent appraisal drilling to obtain essential reservoir data, a development project based on delivery of sufficient gas to supply a six train LNG plant, with a coincident cycling operation, was planned. High wellstream temperatures, pressures, gas throughput rates and corrosive CO2 content, placed producing, safety, security and environmental constraints on the design of surface wellstream gathering and processing facilities and led to the selection of the cluster development concept.

Producing capacity, dedicated to LNG plant demand, has resulted in a two phase field development program. Program I, consisted of two producing clusters each containing two producing trains and five high rate gas wells, a central control and power site (point "A"), a gas cycling system consisting of three injection compressors, eight injection wells and injection lines, and a 16-inch condensate transmission pipeline to the LNG plant. Production from the two clusters has supplied the three train (first phase) LNG plant, completed in late 1978, and the Arun Field cycling project. Program II commencing in 1981, will provide for an additional two producing clusters, each consisting of two producing trains and six producing wells, as dictated by the LNG plant expansion program.

This paper will provide an overview of the Arun Field production mode design concepts, detail the problems encountered in the surface producing facilities following start-up, i.e. corrosion, separator carryover and recycling compressor limitations, and define how these problems have been, or are being, resolved. This will include a projection of anticipated equipment modifications and additions which will be required to accommodate to changing reservoir conditions during the producing life of the Arun Gas Field.

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