15/9-1
Export: PDF
-
General information
-
Wellbore history
GeneralWell 15/9-1 is located in the Sleipner Field. It was drilled on a seismic structure in order to evaluate the Dogger sandstone (Hugin and Sleipner Formations) of Middle Jurassic age.Operations and resultsWildcat well 15/9-1 was spudded with the semi-submersible installation Ross Rig on 24 February 1977 and drilled to TD at 3734 m in the Late Triassic Skagerrak Formation. Severe weather occurred on 31 March, at 3539 m, when the drill string was hung off in the wellhead and the lower marine package disconnected. Drilling commenced on 2 April. When washing/reaming back to TD at 3675 m with a bit to open up the rat hole the pipe stuck at 3647m. Jarring/fishing action was unsuccessful and the string was backed off at 3507 m. The hole was then plugged back, sidetracked and drilled to TD. The well was drilled with seawater and hi-vis pills to 415.5 m and with a seawater/conditioned bentonite/spersene mud system from 415.5 m to TD.Top of the Dogger sandstone (Hugin Formation) was encountered at 3530 m. Log evaluation gave a net productive pay of 56 m, of which 38 m was gas bearing and 18 m was oil bearing. Lowest producible hydrocarbon depth was top of coal bed at 3672 m. Good shows were recorded on cuttings in the interval 3633 m to 3687 m, and in porous sandstones on cores from 3545 m to 3667 m. The Jurassic sandstone was cored in nine cores between 3521 m and 3675.5 m. RFT fluid samples were taken at 9 depths in the interval 3525.5 m to 3701 m. Most of them recovered traces of condensate or oil together with mud filtrate and gas. Only three samples recovered measurable quantities of fluid hydrocarbons: 3528.8 m (5 - 15 ml condensate), 3596.5 m (500 ml condensate), and 3621 m (5 - 15 ml oil).The well was permanently abandoned on 30 May 1977 as an oil and gas appraisal.TestingTwo DST's were performed.DST 1 perforated the interval 3660 m to 3655 m and flowed 1330 STBOPD (211.5 Sm3 oil /day) and 1420000 SCF/D (40210 Sm3 gas/day). This gives a GOR of 1070 SCF/STB (191 Sm3/Sm3). The gas gravity was 0.738 (air = 1), and oil gravity was 26 °API. Foam problems made it difficult to get reliable separator data: oil rates are probably maximum rates and GOR could thus be substantially higher.DST 2 perforated 3602 m to 3607 m and flowed 812 STBOPD (129.1 Sm3 oil/day) and 26000000 SCF/D (7362400 Sm3 gas/day). This gives a GOR of 32000 SCF/STB (5700 Sm3/Sm3). The gas gravity was 0.704 (air = 1) and oil gravity was 45.5 °API. -
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]170.003734.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13521.03539.3[m ]23539.33557.5[m ]33557.53567.7[m ]43570.03584.5[m ]53587.83602.3[m ]63603.13621.3[m ]73621.33639.1[m ]83639.13657.4[m ]93657.43675.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]148.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
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 availableDSTTEST10.000.0017.05.1977 - 07:00YESDSTTEST20.000.0023.05.1977 - 00:00NO -
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 typeCONDUCTOR30168.036170.00.00LOTSURF.COND.20397.026400.00.00LOTINTERM.13 3/81203.017 1/21205.00.00LOTINTERM.9 5/82849.012 1/42850.00.00LOTLINER73734.08 1/23734.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03655366019.02.03602360725.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0211402100.8900.7381912.01297362420.7800.7035700 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL CCL GR4001203CBL VDL CCL GR14502842CBL VDL CCL GR27103709CPI34993725FDC CNL GR3973736HDT28463736ISF SONIC3973735RFT28563690SONIC131402VELOCITY6203734 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1318241065118512661808213122272227229023572391261126252732274327432783295530063140330033003327334533773377348535303530361637013701 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.49 -
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]pdf25.68pdf2.29pdf11.61pdf2.30pdf3.10pdf6.71pdf3.05pdf17.54pdf4.88pdf1.37pdf0.31pdf3.04pdf7.27pdf8.94pdf1.66pdf1.80pdf0.49pdf0.33pdf11.12pdf4.82pdf0.94pdf1.28pdf2.76pdf2.14pdf1.08pdf3.28pdf2.03pdf0.45 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3521.0540.026.0spud mud11901.0639.024.0water based22801.2249.011.0water based28671.2450.014.0water based35181.4157.011.0water based37331.4250.012.0water based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1640.0[m]DCRRI1670.0[m]DCRRI1700.0[m]DCRRI1730.0[m]DCRRI1760.0[m]DCRRI1790.0[m]DCRRI1810.0[m]DCRRI1820.0[m]DCRRI1860.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1910.0[m]DCRRI1920.0[m]DCRRI1940.0[m]DCRRI1960.0[m]DCRRI2000.0[m]DCRRI2020.0[m]DCRRI2040.0[m]DCRRI2060.0[m]DCRRI2070.0[m]DCRRI2140.0[m]DCRRI2160.0[m]DCRRI2180.0[m]DCRRI2200.0[m]DCRRI2220.0[m]DCRRI2230.0[m]DCRRI2350.0[m]DCRRI2362.0[m]DCRRI2380.0[m]DCRRI2395.0[m]DCRRI2410.0[m]SWCOD2425.0[m]DCRRI2440.0[m]DCRRI2455.0[m]DCRRI2470.0[m]DCRRI2479.0[m]DCRRI2506.0[m]DCRRI2521.0[m]DCRRI2536.0[m]DCRRI2551.0[m]DCRRI2566.0[m]DCRRI2581.0[m]DCRRI2596.0[m]DCRRI2614.0[m]DCRRI2620.0[m]DCRRI2623.0[m]DCRRI2647.0[m]DCRRI2656.0[m]DCRRI2665.0[m]DCRRI2674.0[m]DCRRI2683.0[m]DCRRI2692.0[m]DCRRI2701.0[m]DCRRI2710.0[m]DCRRI2719.0[m]DCRRI2737.0[m]DCRRI2746.0[m]DCRRI3301.0[m]DC3325.0[m]DC3331.0[m]DC3343.0[m]DC3349.0[m]DC3352.0[m]DC3361.0[m]DC3367.0[m]DC3373.0[m]DC3379.0[m]DC3391.0[m]DC3403.0[m]DC3415.0[m]DC3427.0[m]DC3450.0[m]DC3462.0[m]DC3474.0[m]DC3486.0[m]DC3498.0[m]DC3498.0[m]DC3510.0[m]DC3516.0[m]DC3521.2[m]C3522.0[m]DC3522.0[m]DC3526.6[m]C3526.9[m]C3527.4[m]C3529.7[m]C3531.1[m]C3533.7[m]C3535.6[m]C3538.2[m]C3543.6[m]C3569.8[m]C3572.2[m]C3572.9[m]C3573.6[m]C3575.9[m]C3582.0[m]C3587.0[m]SWC3611.9[m]C3622.5[m]C3625.1[m]C3626.0[m]C3631.5[m]C3648.2[m]C3661.0[m]C3675.0[m]DC3681.0[m]DC3687.0[m]DC3693.0[m]DC3699.0[m]DC3705.0[m]DC3711.0[m]DC3717.0[m]DC3723.0[m]DC3729.0[m]DC