30/3-2 R
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Generell informasjon
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Brønnhistorie
GeneralWell 30/3-2 R is a re-entry of well 30/3-2, which was suspended at 955 m in Miocene sediments due to a strike. It is located ca 7 km north of the Oseberg Field in the Northern North Sea. The primary objective of the well was to test sandstones belonging to the Brent and Dunlin group. Secondary objective was sandstones in the Statfjord formation.Operations and resultsWildcat well 30/3-2 was re-entered with the semi-submersible installation Deepsea Bergen on 2 September 1980 and drilled to TD at 3567 m in the Triassic Lunde Formation. The re-entry well track was drilled first with gel/lignosulphonate in 12 1/4" pilot hole from 955 m to 2350. Severe problems were experienced when opening up the pilot hole to 17 1/2". The mud system was changed, and a gypsum system was chosen. This change made it possible to complete the 17 1/2" section, but several days were lost due to hole problems and problems with the draw-works control circuits. The rest of the well was drilled with a gypsum/lignosulphonate mud and proceeded according to the program.The Brent group was encountered at 2825 m and consisted of the Ness Formation down to 2878 m and the Etive Formation from 2878 m to top Dunlin Group at 2949.5 m. The Statfjord Formation was encountered at 3228 m. The Brent Group contained two separate hydrocarbon-bearing reservoirs with one oil/water contact at 2839 m in the Ness formation, and another at 2932 m in the Oseberg Formation. RFT data also indicated a light hydrocarbon gradient (0.433 g/cc) in a 7 m thick Intra Dunlin (Cook) sand at 3071 m. The character of the fluorescence seen on this sand indicated gas. Frequent but discontinuous oil shows on limestone and claystone were observed beginning at 1930 m and down through Paleocene, Cretaceous and Late Jurassic to top reservoir in the Brent Group. Below OWC shows on sandstones were observed down to 3339 m.A total of 148 m core was recovered in 12 cores in the interval 2828 m to 3306.5 m in the Brent and Dunlin Groups and the Nansen Member of the Statfjord Formatoion. Three RFT segregated samples were taken in the Brent Group at 2833.5 m (mud filtrate and traces of oil and gas), 2872 m (mud filtrate, oil and some gas), and 2897.5 m (mud filtrate, 37 deg API oil and some gas). A fourth RFT segregated sample was taken in the upper Statfjord Formation, Nansen Member, at 3229.5 m (mud filtrate and gas). An FIT fluid sample was taken in the Dunlin Group at 3078 m (only mud filtrate and sand).The well was permanently abandoned on 16 February 1981 as an oil and gas discovery.TestingThree drill stem tests were attempted in the Brent Group reservoir, two of which were successful.DST 1 tested the interval 2916 - 2923 m in the Oseberg Formation. It produced 324 Sm3 oil and 26335 Sm3 gas /day through a 12.7 mm choke. The GOR was 81 Sm3/Sm3, the oil gravity was 38.8 deg API, and the gas gravity was 0.714 (air = 1). The DST temperature was 125.6 deg C.DST 2 tested the interval 2870 - 2874 m in the Ness Formation. It produced 370 Sm3 oil and 30865 Sm3 gas /day through a 12.7 mm choke. The GOR was 85.9 Sm3/Sm3, the oil gravity was 39.8 deg API, and the gas gravity was 0.710 (air = 1). The DST temperature was 122.2 deg C.DST 3 at 2832 - 2837 m in the Ness Formation failed for technical reasons. -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12828.02833.8[m ]22834.52842.0[m ]32860.02864.4[m ]42879.02893.5[m ]52897.02898.4[m ]62898.52916.0[m ]72916.02934.6[m ]82934.62951.2[m ]93073.03082.5[m ]103083.73102.0[m ]113102.03121.4[m ]123295.03306.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]144.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie340.0[m]DCRRI640.0[m]DCRRI1140.0[m]DCRRI1840.0[m]DCRRI1940.0[m]DCRRI2031.0[m]DCRRI2331.0[m]DCRRI2655.0[m]DCRRI2721.0[m]DCRRI2724.0[m]DCFUGRO2748.0[m]DCFUGRO2772.0[m]DCFUGRO2790.0[m]DCFUGRO2820.0[m]DCFUGRO2826.0[m]DCFUGRO2947.9[m]CRRI2958.0[m]DCFUGRO2976.0[m]DCFUGRO2982.0[m]DCFUGRO3006.0[m]DCFUGRO3018.0[m]DCFUGRO3036.0[m]DCFUGRO3054.0[m]DCRRI3054.0[m]DCFUGRO3114.0[m]DCFUGRO3132.0[m]DCFUGRO3168.0[m]DCFUGRO3204.0[m]DCRRI3204.0[m]DCFUGRO3210.0[m]DCFUGRO3222.0[m]DCFUGRO3423.0[m]DCRRI -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet2117538941954195420022032220327142714273128252825287928822891295029502982312132283228329833083394 -
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]pdf0.12pdf0.27 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.02916292312.72.02870287412.73.0283228370.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.032.00023.0002.031.00023.0003.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.0325270000.8310.714862.0369320000.8260.710863.0 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL CCL GR16753569CBL VDL GR26393051DLL MSFL GR23323562FDC CNL GR CAL9403567GEODIP28003125HDT23323567ISF SONIC GR SP2593567LDT CNT GR23323059LDT GR CAL30513567VELOCITY19002500 -
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 formasjonstestCONDUCTOR30260.036261.00.00LOTSURF.COND.20940.026955.01.72LOTINTERM.13 3/82332.017 1/22355.01.89LOTINTERM.9 5/83057.012 1/43060.01.80LOTLINER73564.08 1/23567.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling6001.1050.0waterbased12501.2050.0waterbased15301.3054.0waterbased20201.4057.0waterbased30501.2556.0waterbased34001.2557.0waterbased -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet2895.00[m ]3073.70[m ]3078.00[m ]3081.80[m ]3098.00[m ]3121.00[m ]3295.45[m ]3304.70[m ]3306.10[m ] -
Trykkplott
Trykkplott Porertrykksdataene kommer fra logging i brønnen hvis ingen annen kilde er oppgitt. I noen brønner der trykk ikke er logget, er det brukt informasjon fra formasjonstester eller brønnspark. Trykkdataene er rapportert inn til Oljedirektoratet og videre prosessert og kvalitetssikret av IHS Markit.Trykkplott Dokument navnDokument formatDokumentstørrelse [MB]pdf0.23