The following are brief profiles of PDO's main fields:.
The latest expansion at Yibal, from 120,000 b/d, was started in 1991 and completed in 1995. This has involved the drilling of 96 additional horizontal wells. Yibal production has risen also thanks to EOR facilities and to additional oil and gas discoveries made by Shell in the field's area. Its recoverable oil reserves are said to exceed 1 bn barrels.
Several fields around the Yibal region form a single geological structure with the Shuaiba formation being the main feature. Together, Yibal, Natih, Fahud, Al Huwaisah, Lekhwair and Shibkah contain about 2 bn barrels of recoverable oil and major reserves of non-associated gas.
Yibal has four gathering stations, expanded in 1994 under a contract signed in April 1992 with Electrowatt Engineering Services of Switzerland and Gran Herne of the UK. Most of the field's expansion has involved the second phase of the Shuaiba formation's development, tapping newly found reserves.
Yibal has two major reservoirs of non-associated gas deep beneath the field, from which most of Oman's gas is produced: Natih, which supplies 85% of the 10 MCM/day of gas fed to the domestic market through the Government gas system (GGS); and Shuaiba, which provides the GGS with about 1 MCM/day. The field also provides most of the 8 MCM/day of gas which Shell re-injects into its oilfields. The other major gas producing field feeding this system is Lekhwair, which has a Shuaiba formation as well. Yibal has a big gas processing plant with a capacity of 16.5 MCM/day and units producing LPG.
The Rima/Jalmud group in the south, discovered in 1979, is PDO's second largest oil producer with a capacity of 90,000 b/d sustainable for a long period. It is now producing 90,000 b/d of 21-32.8[degree sign] API viscous oils from a Paleozoic formation at depths of 3,247 and 4,250 feet.
The group includes North Jalmud discovered in 1980, and the fields have more than 120 wells. To boost their capacity and reduce production costs, Shell has installed a computerised beam pump control on their wells. Lekhwair, in the north discovered in 1968, is PDO's second largest oil producer with its output now averaging 80,000 b/d of oils mostly of 37.8[degree sign] API from Lower Cretaceous formations, 4,352 feet deep. Its development was completed in mid-1993, raising its capacity to 100,000 b/d, from about 26,000 b/d. But the field's capacity sustainable for a long period is 90,000 b/d. The field has more than 145 horizontal wells, including 128 producers of which 82 were drilled in 1991-93.
The programme to expand the field envisages a second phase to raise its production capacity to 200,000 b/d by 2000 at a total cost of $500m. This has called for the drilling of 176 additional wells, installation of oil and gas production facilities and four gathering pipelines, and a 108-km gas pipeline to link Lekhwair wells to the Yibal gas processing plant.
Brown & Root of the US and National Drilling Services Co. of Oman, the main contractors, began work on this programme in late 1990. Another main contract for this programme was won in December 1990 by a JV of Saipem of Italy and the Lebanese Consolidated International Contractors Co. (CCC) based in Athens.
The field produces non-associated gas from a Shuaiba formation, which supplies the GGS with about 1.5 MCM/day. The rest of its gas output is used for re-injection.
Nimr, in the south discovered in 1980, produces 70,000 b/d of 21[degree sign] API oil from a Devonian formation at a depth of 3,296 feet. Connected to this is West Nimr, of the same formation discovered in 1982. West Nimr's output is included in Nimr's production stream. Their oil is heavy with high viscosity, as in the case of the Rima/Jalmud group of fields.
Fahud, found in 1963, is an oil and gas field connected to north-central trend of the Arabian Basin as in the case of Yibal and Lekhwair. A naturally fractured field, it has Lower and Middle Cretaceous formations at depths of 2,499 feet. The area includes a West Fahud structure to the north-west and its total oil production capacity at present is 50,000 b/d of 32-33.6[degree sign] API oils with 1.4-1.8% sulphur.
Continued In Gas Market Trends
SP 22, APS Review 6, 9/16 Feb 1998 - OIL MARKET TRENDS - Cont'd
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|Comment:||The following are brief profiles of PDO's main fields:.|
|Publication:||APS Review Oil Market Trends|
|Date:||Feb 9, 1998|
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