Al Shaheen Oil Field
|Al Shaheen Oil Field|
|Operator||Maersk Oil Qatar AS|
|Start of production||1994|
|Current production of oil||240,000 barrels per day (~1.2×107 t/a)|
|Year of current production of oil||2006|
|Producing formations||Khuff formation|
The Al Shaheen Oil Field is a production oil and gas field off the north east coast of Qatar in the Persian Gulf, 180 kilometres (110 mi) north of Doha. The oil field lies over the North Gas Field, the largest gas field in the world. The field is operated by Maersk Oil Qatar AS of Denmark under a production sharing agreement with Qatar Petroleum, on behalf of the state of Qatar.
Though well North West Deep-2, drilled by Shell in 1974, blew out briefly from the Shaheen reservoir, the oil field was only formally discovered in 1992 by Maersk Oil. The drilling of appraisal wells was completed in 1994 using horizontal drilling techniques. Regular oil production started the same year. In 1995–1996, production facilities were extended with subsea export pipelines, an additional single point mooring loading buoy, new process facilities and a STAR type wellhead platform.
In April 2004, the extension area north of block 5 was included to the production sharing agreement. Inauguration of new offshore facilities took place on 23 February 2005.
In May 2008, GSF Rig 127 operated by Transocean drilled the world record extended reach well BD-04A in the field. The well was drilled incident free to a record measured depth of 40,320 ft (12,290 m) including a record horizontal reach of 35,770 ft (10,900 m) in 36 days.
From 2004 until August 2009 the massive supertanker, Knock Nevis, the largest oil tanker built to date, was moored there as a floating storage and offloading unit (FSO). In January 2010, she was replaced by both the FSO Asia, and in August 2010, the FSO Africa replaced the Astro Canopus. Both vessels are owned as a joint venture by Overseas Shipholding Group and Euronav.
The oil and gas producing formation is the Kharaib, Shuaiba and Nahr Umr Formations (Early Cretaceous). The field is described by low permeability, limited thickness, and geological complexity.
The field consists of 131 operational production and water injection wells, 18 permanent platforms, and six production installations connected by 20 pipelines. In 2006, Al Shaheen's production of 240,000 barrels per day (38,000 m3/d) accounted for a significant portion of Qatar's total oil production of 815,000 barrels per day (129,600 m3/d). Although the production capacity reaches 260,000 barrels per day (41,000 m3/d), the current actual production is only 200,000 barrels per day (32,000 m3/d) due to OPEC quotas. A development plan between Maersk Oil and Qatar Petroleum calls for an increase in production to 525,000 barrels per day (83,500 m3/d). This increase is expected to account for the majority of growth in Qatar's petroleum output over this time.
Oil is currently stored in the floating storage and offloading vessels FSO Asia and FSO Africa. Produced oil is transported to the Mesaieed Industrial City for processing and export. There is a plan to build a new 250,000-barrel-per-day (40,000 m3/d) refinery in Mesaieed to process oil from Al Shaheen. This plan has been postponed.
The Al-Shaheen field also produces associated gas. The gas production is estimated about 220 million cubic feet per day (6.2×106 m3/d) of which 125–150 million cubic feet per day (3.5×106–4.2×106 m3/d) is exported through the North Field Alpha facilities to Mesaieed, 30 million cubic feet per day (850×103 m3/d) is consumed on-site for power and heat generation, and 40 million cubic feet per day (1.1×106 m3/d) is flared.
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