25/11-6
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Generell informasjon
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Brønnhistorie
GeneralWell 25/11-6 was drilled ca 1 km west of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The primary objective was to delineate the Paleocene E-70 oil sand and older sands which are developed as topographic mounds (stratigraphic traps) in the Balder Field area. A secondary objective was Danian sand which had oil shows in an offset well.Operations and resultsAppraisal well 25/11-6 was spudded with the semi-submersible installation Norskald on 20 August 1978 and drilled to TD at 1948 m in the Early Cretaceous Cromer Knoll Group. The well was drilled with seawater/gel/lignosulphonate.The well penetrated the Utsira Formation, a Skade Formation sand and a Grid Formation sand and then penetrated a ca 175 m thick section of shales belonging to the lower Hordaland Group before top Balder formation was encountered at 1646 m. An 8 m thick shaly Intra Balder Formation sand at 1664 m had some shows and appeared to be oil bearing on the logs. Two Paleocene Heimdal Formation sand units with tops at 1717.5 m and 1763.0 m were found oil bearing down to a clear oil-water contact at 1785.3 m in the lower sand unit. This defines the OWC of the Balder field at 1760 m MSL. The Danian sand (Ty Formation) was encountered at 1877 m, but was water wet.Five cores were cut in the Lista and Heimdal Formation, recovering a total of 25.5 m core from the interval 1713 to 1797 m. Wire line fluid samples were attempted, but with no success.The well was permanently abandoned on 1 October 1978 as an oil appraisal.TestingOne production test was performed in the interval 1725 to 1740 m in the upper Heimdal Formation sand unit. It produced 485 Sm3 oil and 18123 Sm3 gas with 3-4% sand/day through a 35/64" choke. The GOR was 37 Sm3/Sm3, the oil gravity was 24.3 deg API, and the gas gravity was 0.61 (air = 1). No H2S or Inert gas was detected. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]200.001945.00 -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST11725.001740.0021.09.1978 - 00:00YES -
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 formasjonstestCONDUCTOR30187.036187.00.00LOTINTERM.13 3/8394.017 1/2410.00.00LOTINTERM.9 5/81310.012 1/41327.00.00LOTLINER71927.08 1/21948.00.00LOT -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01725174013.9Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.017.600Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.048518000000.9000.600210 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL2991302CCL GR16121785DLL13091945FDC CNL13041948GR152405HDT13091947ISF SONIC186405ISF SONIC3941308ISF SONIC MSFL13011948TEMP1081757VELOCITY01948 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1516087307527521011108011001462147116461646166416721688170217181848186418771903190319081932 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf1.01pdf156.00 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.22pdf0.05 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling9951.13waterbased17871.13waterbased19471.14waterbased -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1150.0[m]DC1180.0[m]DC1210.0[m]DC1230.0[m]DC1260.0[m]DC1290.0[m]DC1320.0[m]DC1346.5[m]SWC1350.0[m]DC1400.0[m]DC1410.0[m]DC1430.0[m]DC1440.0[m]DC1460.0[m]DC1480.0[m]DC1490.0[m]DC1500.0[m]DC1510.0[m]DC1520.0[m]DC1540.0[m]DC1560.0[m]DC1570.0[m]DC1590.0[m]DC1600.0[m]DC1610.0[m]DC1630.0[m]DC1652.0[m]SWC1656.0[m]SWC1669.0[m]SWC1673.0[m]SWC1675.0[m]SWC1679.0[m]SWC1684.0[m]DC1684.5[m]SWC1690.0[m]DC1690.5[m]SWC1692.5[m]SWC1696.0[m]DC1697.0[m]SWC1702.0[m]DC1704.5[m]SWC1707.0[m]DC1708.0[m]DC1711.0[m]SWC1713.0[m]DC1714.0[m]DC1716.0[m]C1716.0[m]C1716.0[m]SWC1726.0[m]SWC1750.0[m]DC1751.7[m]DC1751.7[m]C1752.0[m]SWC1753.0[m]DC1753.2[m]C1753.3[m]C1754.0[m]SWC1754.7[m]C1756.0[m]DC1756.8[m]DC1756.8[m]C1757.0[m]DC1759.0[m]SWC1760.0[m]SWC1761.0[m]SWC1762.0[m]SWC1762.0[m]DC1767.0[m]DC1772.0[m]DC1776.0[m]SWC1780.0[m]DC1792.0[m]DC1798.0[m]DC1804.0[m]DC1810.0[m]DC1816.0[m]DC1822.0[m]DC1828.0[m]DC1834.0[m]DC1840.0[m]DC1846.0[m]DC1851.0[m]SWC1852.0[m]DC1856.0[m]SWC1858.0[m]DC1863.0[m]SWC1864.0[m]DC1868.5[m]SWC1870.0[m]DC1871.0[m]SWC1876.0[m]DC1882.0[m]DC1900.0[m]DC1906.0[m]DC1909.0[m]DC1912.0[m]DC1945.0[m]DC