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The Qatargas offshore operations are located approximately 80 kilometres northeast of Qatar's mainland. A total of 208 wells supply approximately 18.5 billion standard cubic feet per day (bscfd) of sour gas to 14 LNG trains and four sales gas trains onshore. The gas, along with the associated condensate, is transferred to shore via subsea pipelines.
At the heart of Qatargas' offshore operations are the North Field Bravo (NFB) and RasGas Alfa (RGA) offshore complexes, which were commissioned in 1996 and 1999 respectively. The two contribute approximately 2.8 bscfd of 'dry' gas to the total offshore gas production.
In addition to the NFB and RGA complexes, there are a total of 20 remote wellhead platforms producing approximately 15.7 bscfd of 'wet' gas through eight subsea pipelines.
Both NFB and RGA are bridge connected complexes with living accommodation modules. In addition to the accommodation module, NFB has two production platforms, two wellhead platforms, and a remote wellhead platform located approximately six kilometers from the complex. RGA has one production platform, one wellhead platform, a riser platform, and two remote wellhead platforms located approximately six kilometers from the main complex.
NFB produces 1.6 bscfd of natural gas from 26 wells with RGA contributing an additional 1.2 bscfd from 15 wells drilled into a reservoir deep beneath the sea bed. This 'wet' gas is dehydrated on the respective production platforms and then transported through the individual 32" subsea pipelines from NFB and RGA to their respective onshore LNG trains.
Qatargas 2 has a total of 30 producing wells which supply 2.9 bscfd of 'wet' natural gas through to Trains 4 and 5 onshore. Qatargas 3 and Qatargas 4 each supply 1.4 bscfd of wet natural gas to onshore Trains 6 and 7 respectively. A total of 33 wells are shared between the two ventures.
The three platforms installed for Qatargas 2 are remotely operated from the North Field Bravo, while the three, which are shared between Qatargas 3 and Qatargas 4, are operated remotely from the onshore control room. Natural gas from offshore is transferred to shore with the associated condensate via subsea pipelines.
For Ras Laffan Liquefied Natural Gas Company Limited (RL), 15 wells supply 1.2 bscfd of dry natural gas to RL train 1 and 2 facilities.
For RL II, 41 wells supply four bscfd of wet natural gas to LNG Trains 3, 4, 5 and AKG train 1 for domestic sales gas supply.
For RL 3, 37 wells supply four bscfd of wet natural gas to LNG Trains 6 and 7 and AKG Train 2 for domestic sales gas supply.
The Ras Laffan wells are operated remotely from the central control room at the Alpha platform. Natural gas from offshore is transferred to shore with the associated condensate via subsea pipelines.
Offshore Facts and Figures: