36/7-4
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Generell informasjon
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Brønnhistorie
Wellbore historyGeneralWell 36/7-4 was drilled to test the Cara prospect ca 5 km northeast of the Gjøa Field in the North Sea. The primary objective was to test for hydrocarbons in the Early Cretaceous Agat Formation.Operations and resultsWildcat well 36/7-4 was spudded with the semi-submersible installation Transocean Arctic on 18 July 2016 and drilled to TD at 2726 m in the Early Cretaceous Åsgard Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis sweeps down to 587 m and with KCl/glycol mud from 587 m to TD.Well 36/7-4 successfully penetrated 118.1 of hydrocarbon-bearing Agat Formation sandstone reservoir before reaching a final TD of 2726 m in the Åsgard Formation. The well proved a 51.7 m gas column in good quality reservoir, with a GOC at 2479.2 m. Oil was proven down to close to the base of the Agat sandstone at 2544.4 m, but the reservoir below 2492 m is of reduced quality with low permeability and poor production potential. No oil-water contact (OWC) was seen, neither from pressures, nor on logs or core.Three cores were cut from 2437 to 2555 m in the Agat Formation, including the Agat Formation basal conglomerates. MDT fluid samples were taken at 2440 m (gas), 2458.13 m (gas), 2484.03 m (oil), 2488 m (oil), 2536.61 m (oil), and 2544.4 m (oil/water).The well was permanently abandoned on 26 September 2016 as an oil and gas discovery.TestingA drill stem test was conducted from the gas column in the interval 2428 to 2470 m.Very good overall reservoir properties were proven. The maximum gas rate achieved was 1240000 Sm3/day, through a 72/64" fixed choke. The gas gravity was 0.6378 (air = 1). The condensate had a density of 0.801 g/cm3 (45.2 ºAPI). The Gas/Condensate Ratio was 15592 Sm3/Sm3. The gas had 0.5% CO2 and 0.2 ppm H2S. Measurements at the end of the main shut-in periods (up to 72 hrs) gave the most representative formation temperatures. The temperature at the gas-oil contact is estimated to 80.0 °C. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]590.002726.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12436.92490.7[m ]22491.02499.7[m ]32499.72554.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]117.4Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet372372602602109212581258128520052215222023762376242825542620 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.02428247028.6Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.012400000.8010.63715592 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CMR ADT HRLA PEX ECS23642724FMI MSIP GR23642725MDT GR24292567MDT GR SP24352536MSCT SWC23782640MWD - DIR ECD373439MWD - GR DIR ECD RES439587MWD - GR DIR ECD RES SON487590MWD - GR DIR ECD RES SON5901710MWD - GR ECD RES SON DIR17102115MWD - GR ECD RES SON NEU POR DEN21152780MWD - GR RES ECD RES SON373587USIT CBL GR00VSP GR16892656 -
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 formasjonstestCONDUCTOR30439.036439.00.00SURF.COND.20583.026587.00.00PILOT HOLE587.09 7/8587.00.00590.0590.01.25LOTINTERM.13 3/81701.017 1/21710.00.001713.01713.01.50FITINTERM.9 5/82364.012 1/42370.00.002374.02374.01.48LOTLINER72663.08 1/22726.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling3721.039.0Sweeps4391.1540.0KCL/Polymer/Glycol4421.4936.0Kill/DIsplacment Mud5041.0313.0Sweeps5041.4934.0Kill/DIsplacment Mud5351.011.0Seawater5351.1719.0KCl mud5871.1540.0KCL/Polymer/Glycol5871.4934.0Kill/DIsplacment Mud5901.1525.0KCL/Polymer/Glycol9171.1624.0KCL/Polymer/Glycol10911.1724.0KCL/Polymer/Glycol12341.1623.0KCL/Polymer/Glycol14881.1722.0KCL/Polymer/Glycol15251.1625.0KCL/Polymer/Glycol17101.1726.0KCL/Polymer/Glycol17101.1527.0KCL/Polymer/Glycol21001.1917.0KCl mud21001.1717.0KCl mud21411.1720.0KCL/Polymer/GEM23741.1922.0KCL/Polymer/Glycol26651.192.0NaCl Brine26651.2117.0KCl Polymer GEM27261.1922.0KCL/Polymer/Glycol