The scope of works for OGD-3 covers the construction of a new gas plant at Habshan to process 1,306 million cubic feet a day (cf/d) of well-stream fluid into 11,000 tonnes a day (t/d) of natural gas liquids (NGL), 3,400 t/d of ethane and 125,000 barrels a day (b/d) of condensate. These streams will then be transported through existing pipelines to the fractionation facilities of Abu Dhabi Oil Refining Company (Takreer), located at Ruwais.
The work, which is expected to be broken into five separate packages, calls for the supply and installation of two condensate separation and stabilising trains, two gas treatment units, two gas dehydration trains, two NGL recovery units and four gas re-injection compression stations. In addition, the project calls for the construction of new pipelines for the export of condensate and NGL support structures, utilities and offsite facilities. UOPof the US is the licensor for both the acid gas removal and NGL recovery units.
A significant element of OGD-3 will cover the development of gas-gathering and re-injection infrastructure around the Thamama reservoir. This entails the construction of new 6-8-inch-diameter flow lines with a total length of 280 kilometres, the supply and installation of five gas manifolds and five 16-inch-diameter trunk lines covering a total length of 60 kilometres for re-injection and the upgrade of the existing supervisory control and data acquisition (SCADA) network.
AGD-2, which is the smaller of the two schemes, covers the supply and installation of two gas treatment and two NGL recovery units under licence from UOP. The new plant will have capacity to process 734 million cf/d of sour gas into 4,700 t/d of NGL and 1,700 t/d of ethane. Bechtelof the US has completed the front-end engineering and design (FEED) studies for both schemes. The contract period is scheduled for 38-42 months.
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