Phases 2-3: how it all works

24 January 2003
Gas for phases 2 and 3 is provided at present from 15 offshore wells located in the Kangan-Dalan reservoirs in the Gulf. Drilling started in October 2000 and will be concluded by April with the completion of a further five wells, according to TotalFinaElf.

The wells are connected to two unmanned wellhead platforms, SPD-3 and SPD-4, which sit in 65 metres of water. Using a so-called wet scheme, anti-corrosives are transported from onshore and injected into the effluent from phases 2 and 3, to allow the transport of the gas through two 105-kilometre subsea pipelines. The mixture of gas, condensates and water is separated at the onshore treatment plant, built by South Korea's Hyundai Engineering & Construction Company. The plant comprises four trains, each with capacity of 500 million cubic feet a day (cf/d).

On arrival at the treatment facility, the gas is pumped into a 3,100-cubic-metre slug catcher, sweetened through desulphurisation and dehydrated. The next steps include refrigerating the gas in a propane unit, compression and transfer into the third Iranian gas trunkline (IGAT-3). The facilities also produce 400 tonnes a day of sulphur and 80,000 barrels a day of condensate. Both by-products are earmarked for export.

The industrial complex benefits from common facilities developed by National Iranian Oil Company for phase 1. This includes the spur pipe linking the site with IGAT, the condensate loading buoy and sulphur storage and export facilities.

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