2/7-7
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Generell informasjon
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Brønnhistorie
GeneralWell 2/7-7, was drilled to appraise the southern part of the Eldfisk structure in North Sea. The primary objective was to test the Danian Limestone, expected to be about 120 m thick.Operations and resultsAppraisal well 2/7-7 was spudded with the semi-submersible installation Ocean Viking on 2 January 1973 and drilled to TD at 3084 m in the Early Cretaceous Rødby Formation. The well was drilled with seawater and hi-vis sweeps down to 497 m and with gypsum/lignosulphonate mud from 497 m to TD. 4-6% diesel additive was used below 497 m.The Danian Limestone was found to be highly fractured, only3 0 m thick, and yielded commercial quantities of oil and gas on one drill stem test. The Late Cretaceous, which was 195 m thick, was also found to contain hydrocarbons, and yielded commercial amounts of oil and gas on two out of three drill stem tests. The Danian Limestone and the upper part of the Late Cretaceous were thinner than expected due to a fault throwing Campanian on Turonian rocks.No cores were cut and no fluid samples were taken.The well was permanently abandoned on 29 March 1973 as an oil appraisal.TestingFour intervals in the chalk section were perforated and testedDST's 1 and 2 tested the interval 2911 to 2925. The interval gave a weak flow with headed oil + gas. The oil gravity was measured to 36.2 °API.DST 3 tested the interval 2838 to 2905 m. The interval produced after acidizing 977 Sm3 oil and 387900 Sm3 gas /day through a 1.5 " choke. The GOR was 397 Sm3/Sm3, the oil gravity was 36.8°API, and the gas gravity was 0.7078 (air = 1).DST's 4 and 5 tested the interval 2827 to 2833 m. The interval produced after acidizing 1024 Sm3 oil and 443400 Sm3 gas /day through a 1.5 " choke. The GOR was 433 Sm3/Sm3 and the oil gravity was 37°API.DST 6 tested the interval 2789 to 2822 m. The interval produced after acidizing 1179 Sm3 oil and 497800 Sm3 gas /day through a 1.4" choke. The GOR was 422 Sm3/Sm3, the oil gravity was 35.8°API, and the gas gravity was 0.6883 (air = 1).DST 2 (2911 to 2925 m) and DST 4 (2827 to 2833 m) were misruns due to leaks. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]518.163081.53 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet9716022677267726882723276927922792282228292963296730183018 -
Geokjemisk informasjon
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Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.27 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf1.24pdf16.46 -
Dokumenter – Sokkeldirektoratets publikasjoner
Dokumenter – Sokkeldirektoratets publikasjoner Dokument navnDokument formatDokumentstørrelse [MB]pdf72.88pdf0.82pdf0.56 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0291129250.03.02838290538.05.02827283338.06.02789282238.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.03.05.06.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.03.09764156914265.010455181934966.01179526693447 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BHC4873072CBL22862916CBL23472950CBL23472804CBL25912835CCL29052954CDM24263078CNL25912954FDC27433048FDC CNL27433048GR97487IES4873082ISF12192439ML MLL27433048VELOCITY4813072 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30133.036133.00.00SURF.COND.20487.026497.00.00INTERM.13 3/81219.017 1/21232.00.00INTERM.9 5/82428.012 1/42439.00.00OPEN HOLE3085.08 1/23085.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1301.07seawater4881.37barite24381.71barite30801.73barite