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Qatar - The Gas Processing Sector.

QP processes associated gas at its four NGL plants in Messai'eed (formerly known as Umm Sa'id), which produce propane, butane and NGL for export and as feedstock to industries and fuel for water desalination and power plants. The processing plants can produce 96,000 b/d of butane, propane, natural gasoline (NGL), naphtha, condensate, ethane-rich gas and methane.

In 2009, QP combined into one two EPC contracts worth about $1bn in total at the Messai'eed and Dukhan industrial cities. Messai'eed's job covered construction of a new acid gas removal unit, an amine-sweetening plant, re-habilitation of the sulphur recovery unit, the supply and installation of compressors and a flared gas system.

The plant has the capacity to process about 750 MCF/d primarily used as feedstock for petrochemicals. The second is for an acid gas removal unit at the onshore Dukhan field to process about 450 MCF/d of gas from the Khuff formation (Fm) along with facilities to allow sour gas compression, sweet gas dehydration and acid gas re-injection, and associated utility systems.

In June 2008, QP began a review of the future of its two oldest NGL plants - NGL-1 and NGL-2, at Messai'eed. That was after a fall in oil production at Dukhan and two offshore fields, Bul Hanine and Maydan Mahzam. QP was evaluating whether it was profitable to continue operating the plants, which started up in late 1980/early 1981 and were revamped in 2006 but became out of date.

NGL-1 started up in 1975. It was upgraded in 1981 to process associated gas produced from Dukhan into 1,350 tons/d of ethane-rich gas; 1,284 t/d of propane; 851 t/d of butane; and 588 t/d of NGL. NGL-2, on stream since 1980, processes associated gas from the offshore fields into 127 MCF/d of methane-rich gas; about 1,145 t/d of ethane-rich gas; 1,079 t/d of propane; 899 t/d of butane; and 903 t/d of NGL.

NGL-3, or North Field Gas Plant (NFGP), came on stream several years later to fill the gap in Qatar's need of ethane as feedstock for the ethylene complex at Messai'eed and methane feedstock for the fertiliser complex at the same zone, as well as to produce LPG and NGL for export. Its capacity: 1,030 MCF/d of lean gas; 3,000 t/d of raw NGL; 3,240 t/d of stabilised condensates; and 280 t/d of sulphur.

NGL-4, on stream in late 2002, has this capacity: 1.1m t/y of ethane; 1m t/y of propane; 700,000 t/y of butane; and 400,000 t/y of NGL. This plant processes gas and condensate from the second phase of Dukhan's Arab D gas recycling system and from the Arab C gas recycling unit at Bul Hanine. Its ethane output is dedicated as feedstock to an ethylene complex at Messai'eed built for Q-Chem, a JV between QGPC and ConocoPhillips (see down11QatrPetchm14Sep15). NGL-4 was built by a Snamprogetti/Hyundai JV under a $400m EPC contract awarded in August 1999.

Fractionators at Messai'eed are inter-connected, so each one can process liquids either from the onshore or from offshore systems. They share export/storage units.

Onshore associated gas coming with crude oil is separated at de-gassing stations in Dukhan. The gas is collected from separators and, after compression at field stations, flows to Fahaheel's stripping plant. After the heavy ends are liquefied and removed, lean gas is routed to the domestic distribution system.

Offshore associated gas is separated from oil at three GOSPs at ISND, Maydan Mahzam and Bul Hanine fields. The gas is compressed at each of the platforms. Mixed liquids are brought ashore through an 85 km marine pipeline and carried to NGL-2.
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Publication:APS Review Downstream Trends
Date:Sep 7, 2015
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