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Generated 09.02.2010

Field: EKOFISK

General information

Current activity status: PRODUCING
Discovery wellbore: 2/4-2
Discovery year: 1969
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Description Norwegian

Development

Ekofisk is an oil field located in the southern part of the North Sea. The sea depth in the area is between 70-75 metres. Production at Ekofisk began in 1971 from the jack-up facility Gulftide. During the first years, the field produced to tankers from four wells, until the concrete tank was in place in 1973. Since then, the field has been further developed with many facilities, including riser facilities for associated fields and export pipelines. Several of these have been decommissioned and are awaiting disposal. Today, the operative parts of the Ekofisk Centre consist of the accommodation facilities, Ekofisk H and Ekofisk Q, the production facility Ekofisk C, the wellhead facility for water injection Ekofisk W, the drilling and production facility Ekofisk X, the processing facility Ekofisk J and the production and processing facility Ekofisk M. From the wellhead facility Ekofisk A south on the field, production goes to the riser facility Ekofisk FTP for processing at the Ekofisk Centre. In 2007 the pipeline from Ekofisk B in the northern part of the field was rerouted to Ekofisk M. Ekofisk B is connected by bridge to Ekofisk K, which is a facility for water injection. A plan for water injection was approved on 20.12.1983, a PDO for Ekofisk II was approved on 09.11.1994 and Ekofisk Growth was approved on 06.06.2003.

Reservoir

The Ekofisk field produces from fractured chalk of the Ekofisk and Tor formations of Early Paleocene and Late Cretaceous ages. The reservoir rocks have high porosity, but low permeability. The reservoir has an oil column of more than 300 metres and lies 2 900 - 3 250 metres below sea level.

Recovery strategy

Ekofisk was originally developed by pressure depletion and had an expected recovery factor of 17 per cent. Since then, limited gas injection and comprehensive water injection have contributed to a substantial increase in oil recovery. Large scale water injection started in 1987, and in subsequent years the water injection area has been extended in several phases. Experience has proven that water displacement of the oil is more effective than expected, and the expected recovery factor for Ekofisk is now approximately 50 per cent. In addition to the water injection, compaction of the soft chalk provides extra force to the drainage of the field. The reservoir compaction has resulted in subsidence of the seabed, now more than 9 metres, centrally on the field. It is expected that the subsidence will continue for many years, but at a lower rate.

Transport

Oil and gas are routed to the export pipelines via the processing facility on Ekofisk J. Gas from the Ekofisk area is sent via Norpipe Gas pipeline to Emden, while the oil, which also contains the NGL fractions, is sent via Norpipe Oil pipeline to Teesside.

Status

Production from Ekofisk is maintained at a high level. This is mainly due to increased number of water injection wells and production from new facilities on the field. There are plans for new facilities and new drilling targets for extended water injection in the southern parts of the field. In addition to efforts to optimise short and long-term production, work on disposal of disused facilities is in progress.

Activity status history

Activity status From date To date
PRODUCING 15.06.1971
PDO APPROVED 01.03.1972 15.06.1971

Current owner(s)

Production License: 018

The field extends into

Block(s) Production licence(s)
2/4 018

Current operator(s)

Company
ConocoPhillips Skandinavia AS

The NPDs reserve estimates as of 31.12.2008 (Norwegian share)

Recoverable reserves Remaining reserves
Oil
[mill Sm3]		 Gas
[bill Sm3]		 NGL
[mill tonn]		 Cond.
[mill Sm3]		 Oil
[mill Sm3]		 Gas
[bill Sm3]		 NGL
[mill tonn]		 Cond.
[mill Sm3]
528.50 156.10 14.50 0.00 125.70 20.40 2.20 0.00

Net production of saleable products (Norwegian share)

NGL = butane + ethane + isobutane + propane + LPG + gasoline + NGL mix.
Condensate = Condensate.
Sm3o.e. = oil + gas + NGL + condensate.

Charts


Oil
[mill Sm3]		 Gas
[bill Sm3]		 NGL
[mill tonn]		 Cond.
[mill Sm3]		 NGL
[mill Sm3]		 Sm3o.e.
[mill]
Total per dec.2009 414.047703 137.682057 12.519036 0.000000 25.622205 577.351965
2009 11.247099 1.902784 0.217164 0.000000 0.455642 13.605525
dec.2009 0.923810 0.156424 0.016783 0.000000 0.035363 1.115597
nov.2009 0.930137 0.160387 0.016983 0.000000 0.035841 1.126365
oct.2009 0.972398 0.159467 0.018527 0.000000 0.038983 1.170848
sep.2009 0.854492 0.143804 0.015894 0.000000 0.033468 1.031764
aug.2009 0.887934 0.154529 0.017430 0.000000 0.036603 1.079066
jul.2009 0.935585 0.159608 0.017056 0.000000 0.036530 1.131723
jun.2009 0.889159 0.152118 0.015810 0.000000 0.033717 1.074994
may.2009 0.952896 0.157544 0.015896 0.000000 0.034101 1.144541
apr.2009 0.964848 0.161476 0.020183 0.000000 0.042064 1.168388
mar.2009 1.029987 0.174569 0.020002 0.000000 0.041955 1.246511
feb.2009 0.892946 0.149698 0.019877 0.000000 0.040461 1.083105
jan.2009 1.012907 0.173160 0.022723 0.000000 0.046556 1.232623
2008 12.188976 2.156211 0.256015 0.000000 0.528047 14.873234
dec.2008 1.022379 0.174876 0.022928 0.000000 0.046635 1.243890
nov.2008 1.022370 0.178016 0.019850 0.000000 0.040886 1.241272
oct.2008 1.042235 0.188025 0.022097 0.000000 0.045421 1.275681
sep.2008 1.023796 0.187805 0.023351 0.000000 0.047855 1.259456
aug.2008 1.041791 0.191691 0.020834 0.000000 0.043247 1.276729
jul.2008 1.031106 0.178872 0.020717 0.000000 0.042463 1.252441
jun.2008 0.860509 0.142684 0.017554 0.000000 0.036144 1.039337
may.2008 1.030873 0.178499 0.021065 0.000000 0.043571 1.252943
apr.2008 0.998036 0.170943 0.020714 0.000000 0.042831 1.211810
mar.2008 1.039190 0.189283 0.023168 0.000000 0.047999 1.276472
feb.2008 1.004039 0.183143 0.021175 0.000000 0.044005 1.231187
jan.2008 1.072652 0.192374 0.022562 0.000000 0.046990 1.312016
2007 13.182626 2.285503 0.253058 0.000000 0.524086 15.992215
2006 15.790198 2.637835 0.308649 0.000000 0.635421 19.063454
2005 15.818245 2.531173 0.297432 0.000000 0.612771 18.962189
2004 16.521170 2.578580 0.301121 0.000000 0.622007 19.721757
2003 17.172678 2.688605 0.300064 0.000000 0.623001 20.484284
2002 17.232917 2.743134 0.291923 0.000000 0.604778 20.580829
2001 16.564567 2.877655 0.254935 0.000000 0.522722 19.964944
2000 16.668578 3.014809 0.268040 0.000000 0.548599 20.231986
1999 14.273939 2.784815 0.236917 0.000000 0.484212 17.542966
1998 14.534260 3.623763 0.301924 0.000000 0.625936 18.783959
1997 14.271755 4.993076 0.396060 0.000000 0.819243 20.084074
1996 13.445723 5.242841 0.432900 0.000000 0.895167 19.583731
1995 12.827370 5.176290 0.442677 0.000000 0.919482 18.923142
1994 10.101140 4.748295 0.405676 0.000000 0.844976 15.694411
1993 8.766770 4.669110 0.409346 0.000000 0.857190 14.293070
1992 8.996117 5.863771 0.463211 0.000000 0.964952 15.824840
1991 8.600786 4.839408 0.510143 0.000000 1.058235 14.498429
1990 7.495305 5.218487 0.531768 0.000000 1.081768 13.795560
1989 6.637857 5.042424 0.565177 0.000000 1.146439 12.826720
1988 5.362982 3.775786 0.540591 0.000000 1.092696 10.231464
1987 3.996733 3.878898 0.359601 0.000000 0.737724 8.613355
1986 4.696871 2.653074 0.452203 0.000000 0.916752 8.266697
1985 6.233659 5.811482 0.587619 0.000000 1.192822 13.237963
1984 7.418934 6.595373 0.584416 0.000000 1.200084 15.214391
1983 8.109357 5.922780 0.630409 0.000000 1.276963 15.309100
1982 8.127318 6.343069 0.546911 0.000000 1.093172 15.563559
1981 8.986314 6.496649 0.521287 0.000000 1.041992 16.524955
1980 10.998654 6.454681 0.561878 0.000000 1.118430 18.571765
1979 12.978387 5.759196 0.289921 0.000000 0.576896 19.314479
1978 15.522186 4.931257 0.000000 0.000000 0.000000 20.453443
1977 15.888289 1.441243 0.000000 0.000000 0.000000 17.329532
1976 16.226786 0.000000 0.000000 0.000000 0.000000 16.226786
1975 10.995331 0.000000 0.000000 0.000000 0.000000 10.995331
1974 2.014168 0.000000 0.000000 0.000000 0.000000 2.014168
1973 1.869520 0.000000 0.000000 0.000000 0.000000 1.869520
1972 1.927020 0.000000 0.000000 0.000000 0.000000 1.927020
1971 0.357118 0.000000 0.000000 0.000000 0.000000 0.357118

Gross production (Norwegian share)

Sm3o.e. = oil + gas + condensate.

Charts

Oil
[mill Sm3]		 Gas
[bill Sm3]		 Cond.
[mill Sm3]		 Sm3o.e.
[mill]		 Water
[mill Sm3]
Total per dec.2009 429.224426 191.643947 0.000000 620.868373 70.496992
2009 10.712581 2.395256 0.000000 13.107837 10.627097
dec.2009 0.877349 0.193200 0.000000 1.070549 0.959581
nov.2009 0.887282 0.196499 0.000000 1.083781 0.991218
oct.2009 0.928171 0.199406 0.000000 1.127577 0.954125
sep.2009 0.807459 0.179743 0.000000 0.987202 0.777966
aug.2009 0.842996 0.193968 0.000000 1.036964 0.873611
jul.2009 0.891703 0.197376 0.000000 1.089079 0.789595
jun.2009 0.845754 0.189106 0.000000 1.034860 0.787311
may.2009 0.906700 0.200066 0.000000 1.106766 0.842361
apr.2009 0.927563 0.202869 0.000000 1.130432 0.853541
mar.2009 0.984007 0.217262 0.000000 1.201269 0.949985
feb.2009 0.854193 0.186881 0.000000 1.041074 0.869178
jan.2009 0.959404 0.238880 0.000000 1.198284 0.978625
2008 11.545218 2.653935 0.000000 14.199153 8.996618
dec.2008 0.974989 0.237712 0.000000 1.212701 0.819951
nov.2008 0.970363 0.218354 0.000000 1.188717 0.751457
oct.2008 0.990100 0.229212 0.000000 1.219312 0.792592
sep.2008 0.973818 0.228558 0.000000 1.202376 0.845763
aug.2008 0.987625 0.233566 0.000000 1.221191 0.851345
jul.2008 0.982304 0.218631 0.000000 1.200935 0.765524
jun.2008 0.819100 0.176940 0.000000 0.996040 0.533207
may.2008 0.973325 0.217774 0.000000 1.191099 0.632266
apr.2008 0.935064 0.209508 0.000000 1.144572 0.677727
mar.2008 0.978919 0.229289 0.000000 1.208208 0.773896
feb.2008 0.942140 0.223353 0.000000 1.165493 0.737939
jan.2008 1.017471 0.231038 0.000000 1.248509 0.814951
2007 12.541886 2.862901 0.000000 15.404787 8.227209
2006 15.436105 3.189171 0.000000 18.625276 8.163381
2005 15.429403 2.986181 0.000000 18.415584 7.559322
2004 16.063205 3.009569 0.000000 19.072774 6.802472
2003 16.944467 3.136526 0.000000 20.080993 6.204176
2002 17.353974 3.167556 0.000000 20.521530 5.544646
2001 16.685179 3.241139 0.000000 19.926318 4.549040
2000 16.713862 3.323595 0.000000 20.037457 3.823031
1999 14.697925 2.688649 0.000000 17.386574 0.000000
1998 15.023024 3.761551 0.000000 18.784575 0.000000
1997 15.232564 5.471955 0.000000 20.704519 0.000000
1996 14.167645 6.936399 0.000000 21.104044 0.000000
1995 13.563087 6.902657 0.000000 20.465744 0.000000
1994 10.827071 6.464043 0.000000 17.291114 0.000000
1993 9.554206 6.817669 0.000000 16.371875 0.000000
1992 9.900500 7.774119 0.000000 17.674619 0.000000
1991 9.603255 7.557751 0.000000 17.161006 0.000000
1990 8.497577 6.670953 0.000000 15.168530 0.000000
1989 7.633677 6.511746 0.000000 14.145423 0.000000
1988 6.422754 6.168801 0.000000 12.591555 0.000000
1987 4.774826 4.980652 0.000000 9.755478 0.000000
1986 5.588478 5.955603 0.000000 11.544081 0.000000
1985 7.364044 7.818253 0.000000 15.182297 0.000000
1984 8.535296 8.214480 0.000000 16.749776 0.000000
1983 9.284440 8.100787 0.000000 17.385227 0.000000
1982 9.168102 7.406301 0.000000 16.574403 0.000000
1981 9.973571 7.950990 0.000000 17.924561 0.000000
1980 12.043914 8.368340 0.000000 20.412254 0.000000
1979 13.521964 7.770938 0.000000 21.292902 0.000000
1978 15.536274 7.170323 0.000000 22.706597 0.000000
1977 15.494409 5.039648 0.000000 20.534057 0.000000
1976 16.226786 4.487759 0.000000 20.714545 0.000000
1975 10.995331 2.978395 0.000000 13.973726 0.000000
1974 2.014168 0.557954 0.000000 2.572122 0.000000
1973 1.869520 0.521093 0.000000 2.390613 0.000000
1972 1.927020 0.527360 0.000000 2.454380 0.000000
1971 0.357118 0.102949 0.000000 0.460067 0.000000

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