15/9-19 A
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General information
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Wellbore history
GeneralThe well 15/9-19 SR on the Theta Vest structure North of the Sleipner East Field proved oil in the Hugin Formation in 1993. The objective for the well 15/9-19 A, a side-track from this well, was to confirm a minimum economic hydrocarbon volume in the Hugin Formation and map the extension of the oil-bearing formation.GeneralThe well 15/9-19 SR on the Theta Vest structure North of the Sleipner East Field proved oil in the Hugin Formation in 1993. The objective for the well 15/9-19 A, a side-track from this well, was to confirm a minimum economic hydrocarbon volume in the Hugin Formation and map the extension of the oil-bearing formation.Operations and resultsWell 15/9-19 A was kicked off from 2178 m in well bore 15/9-19 SR on 25 July 1997, using the semi-submersible installation Byford Dolphin. The well was drilled through the Skagerrak Formation and terminated approximately 30 m TVD into the Triassic Smith Bank Formation at 4131 m (3318.5 m TVD RKB). The final acquisition programme immediately after reaching the total depth of the well was strongly affected by a labour conflict, which delayed the well operations for 32.5 days. The originally planned open hole electric logging program had to be terminated and the 7" casing run to TD in order to secure the well. The later cased hole logging failed due to tool problems. The well was drilled oil based with the Ultidril mud system (oil base consists of synthetic olefins) from kick-off to TD.Top of the Hugin Formation was penetrated at 3796.5 m (3015.5 m TVD RKB) approximately 60 m TVD deeper than prognosed. It was 153 m thick (TVD) and oil-bearing. The total oil column in the well was 80 m, but no clear oil-water contact was observed. The base of the reservoir was at 3919 m (-3126.5 m TVD RKB). Seven cores were cut in the interval 3838 m to 4017 m in the Hugin and Skagerrak Formations, with a total recovery of 177.6 m. One attempt was made to run FMT on PCL for pressure points and fluid sampling. The run failed for technical reasons and no further attempts were made due to the labour conflct.The well was permanently abandoned on 9 November 1997 as an oil appraisal.TestingThree tests were performed in order to evaluate the well, one in the water zone and two in the oil zone.Test 1 at 3952 - 3958 m (3159.8 - 3165.5 m TVD RKB), was in the water zone to obtain water samples due to MDT failure during wire line logging. Four good samples were obtained, indicating similar formation water as in other wells in the Sleipner area. Maximum recorded temperature in this test was 112.7 deg C.Test 2A at 3885.5 - 3888.5 m (3100 - 3102.5 m TVD RKB) flowed 300 Sm3 oil and 27000 Sm3 gas /day through a 38/64" choke during the cleanup flow. The corresponding GOR was 90 Sm3/Sm3, the oil density was 0.892 g/cm3, and the gas gravity was 0.738 (air = 1) with 2.5 ppm H2S and 3% CO2. The temperature recorded in this flow period was 112.3 deg C.Test 2B at 3885.5 - 3888.5 m + 3826 -3865 m (3100 - 3102.5 m + 3046.2 - 3081.3 m TVD RKB flowed 528 Sm3 oil and 38107 Sm3 gas /day through a 34/64" choke during the main flow. The corresponding GOR was 72 Sm3/Sm3, the average oil density was 0.902 g/cm3, and the average gas gravity was 0.730 (air = 1) with 2.8 ppm H2S and 3.5% CO2. The temperature recorded in this flow period was 110.8 deg 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]2200.004131.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13837.03852.2[m ]23854.03881.7[m ]33881.53908.4[m ]43908.53934.5[m ]53935.53963.0[m ]63963.03991.0[m ]73991.04016.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]177.0Cores 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 availableDSTTEST1A3885.003889.0027.10.1997 - 16:15YESDSTTEST2B3865.003826.0030.10.1997 - 22:50YES -
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 typeINTERM.9 5/82178.012 1/42179.00.00LOTLINER74044.08 1/24044.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03099310215.12.03046308113.5Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.03.00021.0001122.09.0009.00032.000111Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0200270000.8920.738902.0528381070.9020.73072 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]HDIL MAC DGR CHT21782754HDIL MAC ZDL CND SP CAL CHT PCL34874126MAC GR24903510MWD - DPR TF5A21784131PERF39523958SBT GR CCL25923986VSP GR9802670VSP GR PCL27604080 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1098501111131614542778280229612961302131023178331333133328347635843637365136553655366336673667370637973797396639664097 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.72 -
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]pdf21.49 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured21781.5051.0ULTIDRILL27681.5041.0ULTIDRILL33901.5534.0ULTIDRILL35731.5532.0ULTIDRILL36001.5549.0ULTIDRILL39551.4752.0ULTIDRILL40171.5540.0ULTIDRILL41311.4845.0ULTIDRILL -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3160.0[m]DCSTATOIL3170.0[m]DCSTATOI3180.0[m]DCSTATOI3190.0[m]DCSTATOI3200.0[m]DCSTATOI3210.0[m]DCSTATOI3220.0[m]DCSTATOI3240.0[m]DCSTATOI3250.0[m]DCSTATOI3260.0[m]DCSTATOI3280.0[m]DCSTATOI3290.0[m]DCSTATOI3300.0[m]DCSTATOI3310.0[m]DCSTATOI3320.0[m]DCSTATOI3500.0[m]DCGEOSTR3510.0[m]DCGEOSTR3520.0[m]DCGEOSTR3530.0[m]DCGEOSTR3540.0[m]DCGEOSTR3550.0[m]DCGEOSTR3560.0[m]DCGEOSTR3570.0[m]DCGEOSTR3580.0[m]DCGEOSTR3590.0[m]DCGEOSTR3600.0[m]DCGEOSTR3610.0[m]DCGEOSTR3620.0[m]DCGEOSTR3630.0[m]DCGEOSTR3640.0[m]DCGEOSTR3651.0[m]DCGEOSTR3657.0[m]DCGEOSTR3663.0[m]DCGEOSTR3669.0[m]DCGEOSTR3675.0[m]DCGEOSTR3681.0[m]DCGEOSTR3687.0[m]DCGEOSTR3693.0[m]DCGEOSTR3699.0[m]DCGEOSTR3705.0[m]DCGEOSTR3708.0[m]DCGEOSTR3714.0[m]DCGEOSTR3720.0[m]DCGEOSTR3726.0[m]DCGEOSTR3732.0[m]DCGEOSTR3738.0[m]DCGEOSTR3744.0[m]DCGEOSTR3750.0[m]DCGEOSTR3756.0[m]DCGEOSTR3762.0[m]DCGEOSTR3768.0[m]DCGEOSTR3774.0[m]DCGEOSTR3780.0[m]DCGEOSTR3786.0[m]DCGEOSTR3792.0[m]DCGEOSTR3798.0[m]DCGEOSTR3804.0[m]DCGEOSTR3810.0[m]DCGEOSTR3816.0[m]DCGEOSTR3822.0[m]DCGEOSTR3828.0[m]DCGEOSTR3834.0[m]DCGEOSTR3837.2[m]CGEOSTR3837.2[m]CGEOSTRAT3841.4[m]CGEOSTR3841.4[m]CGEOSTR3846.0[m]CGEOSTR3851.8[m]CGEOSTR3854.8[m]CGEOSTR3859.7[m]CGEOSTR3870.9[m]CGEOSTR3876.7[m]CGEOSTR3881.6[m]CGEOSTR3887.5[m]CGEOSTR3891.2[m]CGEOSTR3894.1[m]CGEOSTR3898.2[m]CGEOSTR3908.0[m]CGEOSTR3913.6[m]CGEOSTR3919.0[m]CGEOSTR3919.2[m]CGEOSTR3923.6[m]CGEOSTR3927.7[m]CGEOSTR3931.3[m]CGEOSTR3937.5[m]CGEOSTR3945.5[m]CGEOSTR3950.5[m]CGEOSTR3957.4[m]CGEOSTR3964.4[m]CGEOSTR3972.2[m]CGEOSTR3976.4[m]CGEOSTR3983.5[m]CGEOSTR3991.2[m]CGEOSTR3998.2[m]CGEOSTR3998.5[m]CGEOSTR4001.7[m]CGEOSTR4007.5[m]CGEOSTR4011.7[m]CGEOSTR4017.0[m]DCGEOSTR4026.0[m]DCGEOSTR4035.0[m]DCGEOSTR4044.0[m]DCGEOSTR4053.0[m]DCGEOSTR4062.0[m]DCGEOSTR4071.0[m]DCGEOSTR4080.0[m]DCGEOSTR4089.0[m]DCGEOSTR4098.0[m]DCGEOSTR4107.0[m]DCGEOSTR4116.0[m]DCGEOSTR4125.0[m]DCGEOSTR4131.0[m]DCGEOSTR