6506/11-2
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General information
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Wellbore history
GeneralWell 6506/11-2 was drilled on the southwestern extension of the Smørbukk Field on the Halten Terrace. The exploratory objectives of the well were to prove oil in the Tilje, Ile, and possibly Garn Formations in the southwestern part of the Smørbukk Discovery. The well would also provide essential field development data for this part of the Smørbukk Discovery in connection with the Smørbukk South Field development planning.Shallow gas warnings were given for seven levels down to 910 m. Maximum pore pressure was expected to ca 1.60 g/cm3 when entering the Late Jurassic reservoir.Operations and resultsWell 6506/11-2 was spudded with the semi-submersible installation Ross Rig on 8 May 1991 and drilled to TD at 4813 m in the Early Jurassic Åre Formation. No shallow gas was encountered. The well was drilled with seawater and hi-vis pills down to 830 m and with gypsum/polymer mud from 830 m to 2307 m. When running the 13 3/8" casing it got stuck. Several Imcospot/Pipelax pills were spotted to free the pipe, but without success, so the hole was plugged back and sidetracked. The sidetrack from 1257 m was drilled with gypsum/polymer mud down to 2255 m, with gypsum/PAC/Kemseal polymer mud from 2255 m to 4238 m, and with bentonite/Thermopol/Ancotemp mud from 4238 m to TD. Planned time budget for the well was 74 days, without testing. The well took 172 days. Significant time was lost due to the stuck 13 3/8" casing with subsequent sidetrack drilling. Problems during DST 1 and P&A phase also contributed significant lost time. However, the main deviation from planned time consumption reflected operational decisions during drilling. Extended logging and coring programs were approved in the course of making hole. The results also lead to confirmation of extended testing.Maximum pore pressure, 1.71 g/cm3, was seen in the top of the Shetland Group at ca 2400 m. The pore pressure in the Late Jurassic was 1.66 g/cm3, about as expected. Several hydrocarbon-bearing sands were encountered and tested. The well proved oil and gas in the Tilje, Ile, Lange, and Lysing Formations. The Garn Formation was a massive sand, but water wet. There were oil shows throughout the Fangst and Båt Groups.A total of 310 m core was recovered in 15 cores from most of the Fangst and Båt Groups. A total of 100 sidewall cores were attempted and 89 were recovered. FMT fluid samples were taken at 3377.7 m, 4045.9 m, 4378.4 m, and 4721.5 m.The well was permanently abandoned on 26 October 1991 as a gas and oil discovery.TestingSix DST tests were performed.DST 1A was performed in the interval 4668 - 4704 m in base Tilje Formation, yielding a maximum flow rate of 554 Sm3/d oil and 770733 Sm3/d gas through an 80/64" choke. Oil density was 0.807 g/cm3 and the GOR was 1392 Sm3/Sm3. Maximum BHT was 160 deg C.DST 2 was performed in the interval 4553.2 - 4597.2 m in top Tilje Formation, yielding a maximum flow rate of 481 Sm3/d oil and 440000 Sm3/d gas through an 80/64" choke. The GOR was 1392 Sm3/Sm3. Maximum BHT was 157 deg C.DST 3 in the interval 4486 - 4510 m in the Tofte Formation flowed only 75 l of cushion fluid; it produced no formation fluid.DST 4 at 4371 - 4420 m in the Ile Formation yielded a maximum flow rate of 714 Sm3/d oil and 1028000 Sm3/d gas through a 64/64" choke. Oil density was 0.783 g/cm3 and the GOR was 1440 Sm3/Sm3. Maximum BHT was 153 deg C.DST 5 at 4005 - 4048 m in the Lange Formation yielded a maximum flow rate of 136 Sm3/d and 69845 Sm3/d gas through a 36/64" choke. Oil density was 0.82 g/cm3 and the GOR was 513 Sm3/Sm3. Maximum BHT was 138 deg C.DST 6 at 3373.5 - 3398.5 m in the Lysing Formation yielded a maximum flow rate of 129 Sm3/d water, 40 Sm3/d oil, and 6825 Sm3/d gas through a 24/64" choke. Oil density was 0.826 g/cm3 and the GOR was 170 Sm3/Sm3. Maximum BHT was 113 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]840.004810.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14241.04242.7[m ]24242.94276.3[m ]34310.04337.0[m ]44361.04380.9[m ]54386.04411.0[m ]64416.04443.0[m ]74488.04495.7[m ]84498.04507.5[m ]94548.04575.1[m ]104575.54602.9[m ]114603.04630.0[m ]124631.04659.0[m ]134659.04682.8[m ]144686.54690.2[m ]154693.54717.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]311.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1910.0[m]DCMILL1920.0[m]DCMILL1930.0[m]DCMILL1950.0[m]DCMILL1960.0[m]DCMILL1980.0[m]DCMILL2020.0[m]DCMILL2040.0[m]DCMILL2060.0[m]DCMILL2080.0[m]DCMILL2100.0[m]DCMILL2120.0[m]DCMILL2140.0[m]DCMILL2160.0[m]DCMILL2180.0[m]DCMILL2190.0[m]DCMILL2200.0[m]DCMILL2210.0[m]DCMILL2218.0[m]DCMILL2230.0[m]DCMILL2250.0[m]DCMILL2270.0[m]DCMILL2290.0[m]DCMILL2310.0[m]DCMILL2320.0[m]DCMILL2350.0[m]DCMILL2370.0[m]DCMILL2380.0[m]DCMILL2400.0[m]DCMILL2420.0[m]DCMILL2440.0[m]DCMILL2460.0[m]DCMILL2480.0[m]DCMILL2500.0[m]DCMILL2520.0[m]DCMILL2540.0[m]DCMILL2560.0[m]DCMILL2580.0[m]DCMILL2590.0[m]DCMILL2600.0[m]DCMILL2620.0[m]DCMILL2640.0[m]DCMILL2660.5[m]SWCSTATO2680.0[m]DCMILL2702.0[m]SWCSTATO2711.2[m]SWCSTATO2711.5[m]SWCSTATO2720.0[m]DCMILL2724.5[m]SWCSTATO2738.5[m]SWCSTATO2750.0[m]DCMILL2770.0[m]DCMILL2780.0[m]DCMILL2800.0[m]DCMILL2807.5[m]SWCSTATO2820.0[m]DCMILL2840.0[m]DCMILL2860.0[m]DCMILL2870.0[m]DCMILL2890.0[m]DCMILL2900.0[m]DCMILL2920.0[m]DCMILL2940.0[m]DCMILL2960.0[m]DCMILL3000.0[m]DCMILL3020.0[m]DCMILL3040.0[m]DCMILL3060.0[m]DCMILL3080.0[m]DCMILL3100.0[m]DCMILL3120.0[m]DCMILL3140.0[m]DCMILL3160.0[m]DCMILL3180.0[m]DCMILL3200.0[m]DCMILL3240.0[m]DCMILL3260.0[m]DCMILL3280.0[m]DCMILL3290.0[m]DCMILL3300.0[m]DCMILL3310.0[m]DCMILL3320.0[m]DCMILL3328.0[m]SWCSTATO3346.0[m]SWCSTATO3359.5[m]SWCSTATO3372.0[m]SWCSTATO3390.0[m]SWCSTATO3405.0[m]SWCSTATO3410.0[m]DCMILL3420.0[m]DCMILL3430.0[m]DCMILL3449.5[m]SWCSTATO3460.0[m]DCMILL3470.0[m]DCMILL3490.0[m]DCMILL3500.0[m]DCMILL3520.0[m]DCMILL3530.0[m]DCMILL3550.0[m]DCMILL3580.0[m]DCMILL3590.0[m]DCMILL3610.0[m]DCMILL3620.0[m]DCMILL3640.0[m]DCMILL3650.0[m]DCMILL3670.0[m]DCMILL3680.0[m]DCMILL3700.0[m]DCMILL3710.0[m]DCMILL3730.0[m]DCMILL3740.0[m]DCMILL3760.0[m]DCMILL3770.0[m]DCMILL3790.0[m]DCMILL3800.0[m]DCMILL3820.0[m]DCMILL3830.0[m]DCMILL3850.0[m]DCMILL3860.0[m]DCMILL3880.0[m]DCMILL3900.0[m]DCMILL3910.0[m]DCMILL3930.0[m]DCMILL3940.0[m]DCMILL3980.0[m]DCMILL3991.2[m]SWCSTATO4000.7[m]SWCSTATO4016.7[m]SWCSTATO4027.7[m]SWCSTATO4034.7[m]SWCSTATO4057.7[m]SWCSTATO4071.7[m]SWCSTATO4082.7[m]SWCSTATO4150.0[m]DCMILL4159.0[m]DCMILL4162.0[m]DCMILL4165.0[m]DCMILL4174.0[m]DCMILL4183.0[m]DCMILL4192.0[m]DCMILL4201.0[m]DCMILL4210.0[m]DCMILL4219.0[m]DCMILL4228.0[m]DCMILL4231.0[m]DCMILL4237.0[m]DCMILL4246.0[m]CSTATO4258.0[m]CSTATO4267.7[m]CSTATO4269.3[m]CSTATO4282.0[m]DCMILL4291.0[m]DCMILL4297.0[m]DCMILL4312.1[m]CSTATO4324.3[m]CSTATO4327.5[m]CRRI4330.0[m]CRRI4332.5[m]CSTATO4334.2[m]CSTATO4335.5[m]CSTATO4336.5[m]CRRI4339.0[m]DCMILL4348.0[m]DCMILL4357.0[m]DCMILL4361.1[m]CRRI4364.8[m]CRRI4368.0[m]DCSTATO4369.5[m]CRRI4373.3[m]CRRI4375.4[m]CSTATO4380.0[m]CSTATO4387.7[m]CRRI4391.8[m]CSTATO4394.6[m]CRRI4397.4[m]CSTATO4401.8[m]CSTATO4403.3[m]CRRI4407.9[m]CSTATO4410.2[m]CRRI4416.7[m]CSTATO4418.8[m]CRRI4421.4[m]CRRI4424.6[m]CSTATO4427.2[m]CRRI4430.6[m]CSTATO4434.2[m]CRRI4438.7[m]CSTATO4441.0[m]CSTATO4443.1[m]CRRI4465.0[m]DCMILL4468.0[m]DCMILL4471.0[m]DCMILL4477.0[m]DCMILL4486.0[m]DCMILL4490.4[m]CSTATO4491.8[m]CSTATO4493.9[m]CRRI4498.6[m]CSTATO4501.8[m]CRRI4504.5[m]CRRI4507.3[m]CSTATO4548.0[m]CSTATO4548.8[m]CSTATO4549.5[m]CSTATO4550.2[m]CSTATO4550.7[m]CRRI4552.5[m]CRRI4555.8[m]CRRI4559.2[m]CRRI4562.9[m]CRRI4564.3[m]CSTATO4564.7[m]CSTATO4567.3[m]CRRI4570.4[m]CSTATO4574.4[m]CRRI4578.1[m]CSTATO4580.2[m]CSTATO4585.5[m]CSTATO4588.2[m]CSTATO4592.0[m]CSTATO4592.1[m]CRRI4598.9[m]CSTATO4600.4[m]CSTATO4608.4[m]CSTATO4612.9[m]CSTATO4615.3[m]CRRI4620.9[m]CRRI4624.8[m]CSTATO4627.5[m]CRRI4629.8[m]CSTATO4631.2[m]CRRI4633.3[m]CRRI4636.3[m]CSTATO4638.0[m]CSTATO4640.9[m]CRRI4643.0[m]CSTATO4647.1[m]CSTATO4651.6[m]CSTATO4656.0[m]CSTATO4661.4[m]CSTATO4665.0[m]CSTATO4675.9[m]CSTATO4682.5[m]CSTATO4689.7[m]CSTATO4695.8[m]CSTATO4697.8[m]CSTATO4703.3[m]CSTATO4706.4[m]CSTATO4711.0[m]CMILL4712.2[m]CSTATO4716.2[m]CSTATO4727.0[m]DCMILL4736.0[m]DCMILL4745.0[m]DCMILL4754.0[m]DCMILL4764.0[m]DCMILL4773.0[m]DCMILL4782.0[m]DCMILL4791.0[m]DCMILL4800.0[m]DCMILL4810.0[m]DCMILL -
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 availableDSTDST1A4668.004704.0029.08.1991 - 16:30YESDSTDST24553.204597.0010.09.1991 - 09:00YESDSTDST44420.004371.0022.09.1991 - 20:00YESDSTTEST54048.004005.0003.10.1991 - 20:00YESDSTTEST63373.503398.5010.10.1991 - 04:30YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit320320145019121912220822082298235823582531273733233323341341394162416241654229422943084359442144214486455145534705 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf1.00 -
Geochemical information
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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]pdf16.38 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04668470431.02.04553459731.03.0448645100.04.04371442025.45.04005404814.36.0337433999.5Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.010.50048.9001602.06.80048.0001573.04.014.50047.7001535.03.50066.4001386.05.00048.500113Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.05547707330.8070.76513922.04814400009153.04.071410280000.7800.73014405.0136698450.8200.7805136.04068250.8260.775170 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CAL22304125CBL VDL GR17502227CBL VDL GR19004220DEL233004757DIFL CDL ACL GR SP8064812DIPLOG22283572DIPLOG39254125DIPLOG42264756DLL MLL SL23053463DLL MLL SL42264756FMT GR23743405FMT GR40094047FMT GR42404271FMT GR42694696FMT GR42704749FMT GR46904749FMT GR47210MWD3844488SWC26603449SWC39544198VELOCITY6804800ZDENS CN GR22274756 -
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 typeCONDUCTOR30380.036381.00.00LOTINTERM.20810.027820.01.51LOTINTERM.13 3/82231.017 1/22335.01.85LOTINTERM.9 5/84223.012 1/44290.02.00LOTLINER74807.08 1/24807.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4421.03WATER BASED14.05.19918301.2016.05.5WATER BASED14.05.19918301.037.011.0WATER BASED14.05.19918301.03DUMMY14.05.19918301.20DUMMY14.05.199113361.25WATER BASED21.05.199117221.2523.05.5WATER BASED21.05.199119321.4921.08.0WATER BASED03.06.199121461.4928.07.0WATER BASED21.05.199122301.7325.010.0DUMMY14.10.199122301.7324.07.0DUMMY16.10.199122301.7319.07.0DUMMY17.10.199122301.7324.07.0DUMMY15.10.199122501.5319.06.5WATER BASED03.06.199122551.5320.05.5WATER BASED04.06.199122551.5322.04.0WATER BASED05.06.199123071.4930.06.5WATER BASED21.05.199123071.4928.06.0WATER BASED21.05.199123071.4922.04.5WATER BASED22.05.199123071.4923.05.0WATER BASED28.05.199123071.4923.05.5WATER BASED28.05.199123071.4916.04.0WATER BASED28.05.199123071.4913.03.5WATER BASED28.05.199123071.4913.03.5WATER BASED28.05.199123071.4912.03.5WATER BASED28.05.199123071.4913.03.0WATER BASED30.05.199123071.4916.013.5WATER BASED31.05.199123071.4915.03.5WATER BASED31.05.199123071.4921.08.0WATER BASED03.06.199123071.5319.06.5WATER BASED03.06.199123141.6520.04.0WATER BASED10.06.199124001.6527.05.5WATER BASED10.06.199124001.6522.06.0WATER BASED14.06.199124001.6530.06.0WATER BASED17.06.199124001.7119.07.5WATER BASED26.06.199124001.7128.08.0WATER BASED01.07.199124001.7127.07.5WATER BASED03.07.199124001.7323.07.0WATER BASED08.07.199124001.7320.07.0WATER BASED10.07.199124001.6525.04.5WATER BASED10.06.199124001.6527.04.5WATER BASED10.06.199124001.6525.08.0WATER BASED10.06.199124001.6521.07.0WATER BASED14.06.199124001.6517.04.5WATER BASED14.06.199124001.6523.04.5WATER BASED14.06.199124001.6531.06.0WATER BASED17.06.199124001.7030.05.0WATER BASED17.06.199124001.7027.04.5WATER BASED18.06.199124001.7125.05.5WATER BASED19.06.199124001.7123.05.5WATER BASED20.06.199124001.7324.05.5WATER BASED25.06.199124001.7121.08.0WATER BASED25.06.199124001.7124.08.0WATER BASED28.06.199124001.7127.07.5WATER BASED01.07.199124001.7124.07.5WATER BASED28.06.199124001.7123.07.0WATER BASED01.07.199124001.7128.07.5WATER BASED03.07.199124001.7126.07.5WATER BASED05.07.199124001.7130.04.5WATER BASED08.07.199124001.7321.07.0WATER BASED10.07.199124001.7321.06.0WATER BASED15.07.199127341.6525.04.5WATER BASED10.06.199129601.6527.04.5WATER BASED10.06.199130401.6527.05.5WATER BASED10.06.199132161.6525.08.0WATER BASED10.06.199132371.6523.04.5WATER BASED14.06.199132441.6521.07.0WATER BASED14.06.199132581.6517.04.5WATER BASED14.06.199133381.6522.06.0WATER BASED14.06.199133451.7325.010.0DUMMY14.10.199133761.6531.06.0WATER BASED17.06.199133761.6530.06.0WATER BASED17.06.199134601.7030.05.0WATER BASED17.06.199135501.7027.04.5WATER BASED18.06.199135801.7123.05.5WATER BASED20.06.199135801.7125.05.5WATER BASED19.06.199136221.7324.05.5WATER BASED25.06.199136461.7121.08.0WATER BASED25.06.199136531.7119.07.5WATER BASED26.06.199137231.7124.07.5WATER BASED28.06.199137971.7124.08.0WATER BASED28.06.199138001.5525.06.0DUMMY08.10.199138001.5525.06.0DUMMY09.10.199138001.5522.05.5DUMMY14.10.199138691.7127.07.5WATER BASED01.07.199139461.7128.08.0WATER BASED01.07.199140051.7730.04.5DUMMY07.10.199140101.7320.07.0WATER BASED10.07.199140291.7123.07.0WATER BASED01.07.199140481.7320.07.0WATER BASED10.07.199140731.7728.05.0DUMMY04.10.199141111.7127.07.5WATER BASED03.07.199141761.7128.07.5WATER BASED03.07.199142251.7126.07.5WATER BASED05.07.199142381.7323.07.0WATER BASED08.07.199142381.7130.04.5WATER BASED08.07.199142381.7321.06.0WATER BASED15.07.199142381.7324.05.5WATER BASED16.07.199142411.1911.04.0WATER BASED17.07.199142431.1915.04.0WATER BASED17.07.199142721.1916.03.0WATER BASED18.07.199143061.1920.04.0DUMMY08.08.199143061.2115.03.0DUMMY12.08.199143061.1921.04.0DUMMY09.08.199143101.1915.04.0DUMMY06.08.199143101.1920.04.0DUMMY07.08.199143101.1921.05.0DUMMY05.08.199143101.1921.05.0DUMMY05.08.199143101.1920.04.0DUMMY31.07.199143101.1915.04.0DUMMY02.08.199143101.1921.05.0DUMMY02.08.199143101.1921.06.0DUMMY05.08.199143101.1915.04.0DUMMY23.07.199143101.1915.03.5DUMMY23.07.199143101.1916.03.5DUMMY23.07.199143101.1916.03.5DUMMY25.07.199143101.1920.05.0DUMMY29.07.199143101.1920.04.5DUMMY29.07.199143101.1919.05.0DUMMY30.07.199143101.1918.03.5DUMMY25.07.199143101.1919.03.5DUMMY29.07.199143101.1916.03.0WATER BASED19.07.199143101.1916.03.5WATER BASED23.07.199143381.1916.03.5WATER BASED23.07.199143611.1915.04.0DUMMY23.07.199143861.1915.03.5DUMMY23.07.199144111.1916.03.5DUMMY23.07.199144161.1918.03.5DUMMY25.07.199144431.1916.03.5DUMMY25.07.199144961.1919.03.5DUMMY29.07.199145481.1920.05.0DUMMY29.07.199145761.1920.04.5DUMMY29.07.199146031.1919.05.0DUMMY30.07.199146591.1920.04.0DUMMY31.07.199146681.229.02.0DUMMY06.09.199146871.1915.04.0DUMMY02.08.199146941.1921.06.0DUMMY05.08.199146941.1921.05.0DUMMY02.08.199146971.1920.04.0DUMMY08.08.199147551.1921.05.0DUMMY05.08.199147551.1921.05.0DUMMY05.08.199147551.1920.04.0DUMMY07.08.199147801.1921.04.0DUMMY09.08.199147931.2211.03.0DUMMY27.08.199147931.2210.03.0DUMMY02.09.199148101.2115.03.0DUMMY12.08.1991 -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.30