15/9-7
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General information
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Wellbore history
GeneralWell 15/9-7 was drilled as an appraisal well on the south part of the Sleipner Vest Field in the North Sea. The primary objective was to test for hydrocarbons in Callovian age sandstones in the Epsilon structure.Operations and resultsAppraisal well 15/9-7 was spudded with the semi-submersible installation Nordraug on 26 December 1980 and drilled to TD at 3776 m in the Middle Jurassic Sleipner Formation. A total of 20 days was spent on waiting on weather. The phase of running BOP after cemented 20" casing took 15 days due to several broken guide wires combined with bad weather. The well was drilled with spud mud down to 465 m, with gypsum/polymer mud from 465 m to 2823 m, and with gel/lignosulphonate/Drispac mud from 2823 m to TD.The primary target Hugin Formation was penetrated at 3519 m and proved to hold gas and condensate down to a true gas/water contact at 3673 m based on RFT gas gradients. The gross reservoir thickness was 185 m (3519 to 3704 m) with a net pay of 83 m with 18% porosity and 12 % water saturation. There were no oil shows above top Hugin reservoir level. Oil shows were described on the cores from the reservoir and on cuttings down to 3677 m.A total of 156 m core was recovered in 12 cores from the interval 3516 to 3671 m. The core-log depth shift was significant for all cores: from +6.0 to +9.1 meter, the largest shifts are for the deepest cores. Segregated RFT fluid samples were taken at 3560 m (gas, mud filtrate and condensate), 3603 m (gas, mud filtrate and condensate), 3658.5 m (gas, mud filtrate and condensate +dark oil emulsion), 3687 m (mud filtrate, formation water and minor gas), and 3672.2 m (mud filtrate and water).The well was permanently abandoned on 29 April 1981 as a gas/condensate appraisal well.TestingThree drill stem tests were performed in the Hugin Formation.DST1 tested the interval 3671 to 3674.5 m. It produced 194100 Sm3 gas and 38 Sm3 condensate /day through a 24/64" choke. The GOR was 5107 Sm3/Sm3, the condensate density was 0.797 g/cm3 and the gas gravity was 0.78 (air = 1). The gas contained 7-8% CO2. The maximum temperature in the test was 127.8 °C.DST2 tested the interval 3637 to 3638.5 m. It produced 322500 Sm3 gas and 93.2 Sm3 condensate /day through a 24/64" choke. The GOR was 3461 Sm3/Sm3, the condensate density was 0.790 g/cm3 and the gas gravity was 0.775 (air = 1). The gas contained 7-8% CO2. The maximum temperature in the test was 121.1 °C.DST3 tested the interval 3555 to 3565 m. It produced 912900 Sm3 gas and 242.8 Sm3 condensate /day through a 64/64" choke. The GOR was 3760 Sm3/Sm3, the condensate density was 0.792 g/cm3 and the gas gravity was 0.775 (air = 1). The gas contained 8-9% CO2. The maximum temperature in the test was 118.3 °C. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]180.003770.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13516.03530.2[m ]23530.23531.5[m ]33533.03551.0[m ]43550.03567.8[m ]53568.03585.6[m ]63585.63597.9[m ]73597.93616.7[m ]83615.03620.4[m ]93621.03633.4[m ]103633.03642.5[m ]113643.03653.0[m ]123653.03671.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]156.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDSTTEST33555.003565.0019.04.1981 - 07:00YES -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30181.036182.00.00LOTSURF.COND.20449.026465.01.52LOTINTERM.13 3/81171.017 1/21185.01.64LOTINTERM.9 5/82823.012 1/42839.01.84LOTLINER73773.08 1/22773.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0367136749.52.0363736389.53.03555356525.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0381940000.7970.78051072.0933220000.7900.77534613.02439130000.7920.7753760 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL4253656CDM28273778CDM AP28213780DLL MSFL34753778FDC4492824FDC CNL28273779GR132181ISF SON4493777ISF SON GR181463RFT00VELOCITY1813777 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit132132857110513351335193723052305235024042453265127032779277928102937318032223266326633063323341234123505351935193721 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf2.34pdf25.28 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6501.1345.0waterbased12751.1445.0waterbased15601.1345.0waterbased18001.1240.0waterbased22501.1245.0waterbased27001.1242.0waterbased34501.5050.0waterbased -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2417.0[m]DCRRI2465.0[m]DCRRI2495.0[m]DCRRI2507.0[m]DCRRI2543.0[m]DCRRI2600.0[m]DCRRI2624.0[m]DCRRI2654.0[m]DCRRI2663.0[m]DCRRI2672.0[m]DCRRI2681.0[m]DCRRI2714.0[m]DCRRI2723.0[m]DCRRI2732.0[m]DCRRI2759.0[m]DCRRI2768.0[m]DCRRI2777.0[m]DCRRI2786.0[m]DCRRI2795.0[m]DCRRI2999.0[m]DC3029.0[m]DC3059.0[m]DC3089.0[m]DC3119.0[m]DC3149.0[m]DC3179.0[m]DC3209.0[m]DC3239.0[m]DC3269.0[m]DC3299.0[m]DC3329.0[m]DC3359.0[m]DC3389.0[m]DC3389.0[m]C3410.0[m]DC3419.0[m]DC3449.0[m]DC3459.0[m]DC3479.0[m]DC3509.0[m]DC3521.4[m]C3539.0[m]DC3541.0[m]C3568.0[m]C3568.8[m]C3569.0[m]DC3581.0[m]DC3581.6[m]C3582.9[m]C3585.3[m]C3588.3[m]C3590.2[m]C3591.5[m]C3598.6[m]C3600.1[m]C3605.6[m]C3608.5[m]C3611.5[m]C3614.0[m]C3615.9[m]C3623.6[m]C3626.3[m]C3628.1[m]C3631.2[m]C3634.5[m]C3635.0[m]C3638.4[m]C3641.1[m]C3643.5[m]C3646.5[m]C3647.2[m]C3651.2[m]C3658.4[m]C3660.0[m]C3661.9[m]C3668.2[m]C3670.0[m]C3671.0[m]DC3671.8[m]C3701.0[m]DC3731.0[m]DC3773.0[m]DC