Dan oil field

The Dan oil field is a large oil and associated gas field in the Danish sector of the North Sea, about west of Esbjerg. Oil and gas are produced through a complex of offshore installations. The Kraka and Regnar fields are satellites to the Dan installations.

The field

The Dan field was discovered in May 1971 by the Britannia oil rig in Denmark Block 7.3 of the North Sea. The reservoir is an Upper Cretaceous Danian chalk at a depth of 5,800 to 6,400 feet. The oil has an API gravity of 30.4 and a gas oil ratio of 600 standard cubic feet per barrel. The estimated recoverable reserves are 90–125 million barrels of oil and 1.2–1.3 trillion cubic feet of gas.

Development

The field was developed in phases through multi-platform installations, summarized as follows:

Platform	Function	Configuration	Type	Legs	Well slots	Installed	Production start	Production to
Dan A	Wellhead drilling	Bridge linked	Steel Jacket	4	6	September 1971	July 1972	Dan B
Dan B	Processing	Bridge linked	Steel Jacket	4	–	1972	July 1972	Oil to Gorm C; Gas to Tyra
Dan C	Separator and Flare	Bridge linked	Steel Jacket	3	–	1972	July 1972	–
Dan D	Wellhead drilling	Bridge linked	Steel Jacket	4	6	March 1975	1976	Dan B
Dan E	Wellhead drilling	Stand alone	Steel Jacket	4	6	April 1976	1977	Dan B
Dan FA	Wellhead drilling	Bridge linked	Steel Jacket				1986	Dan FC
Dan FB	Wellhead drilling	Bridge linked	Steel Jacket				1986	Dan FC
Dan FC	Processing	Bridge linked	Steel Jacket		–		1986	Oil to Tyra; gas to Gorm
Dan FD	Flare	Bridge linked	Steel Jacket		–	1992		–
Dan FE	Wellhead	Bridge linked						Dan FC
Dan FF	Wellhead and processing	Bridge linked	Steel Jacket
Dan FG	Processing	Bridge linked	Steel Jacket		–	2004

Production of condensate was:

Kraka and Regnar fields

The Kraka and Regnar fields are satellites to the Dan installation. The characteristics of the fields are as follows.

Field	Kraka	Regnar
Prospect	Anne	Nils
Reservoir	Chalk	Chalk
Geological age	Danian and Upper Cretaceous	Upper Cretaceous
Coordinates	55.402045°N 5.078377°E	55.385323°N 4.288464°E
Block	5505/17	5505/17
Reservoir depth	1,800 m	1,700 m
Field delineation	81 km²	34 km²
Reserves
Discovered	1966	1979

The fields are developed through two offshore installations as shown.

Field	Kraka	Regnar
Production start	1991	1993
Water depth	45 m	45 m
Installation	Fixed steel no helideck	Subsea steel
Function	Wellheads no processing	Wellhead no processing
Substructure weight tonnes	550	50
Topsides weight tonnes	400	-
Number of wells	8	1
Status	Producing	No production since 2006
Export, well fluids	9 km 8-inch pipeline to Dan FA	13 km 8-inch pipeline to Dan FA
Import, lift gas	9 km 3-inch pipeline from Dan FA	-

The oil production profile of the Kraka and Regnar fields is as shown.

Year	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007
Kraka	144	205	390	491	469	340	315	314	404	350	253	157	139	199	211	222	176
Regnar			145	429	86	41	27	43	29	14	33	18	19	19	16	11	0