6506/12-6
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General information
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Wellbore history
GeneralWell 6506/12-6 was the third on the Alpha structure in block 6506/12, and the first appraisal well on this structure.6506/12-1 was a gas/condensate discovery well on the Alpha South segment while 6406/12-4 encountered only traces of hydrocarbons on the high-pressured Alpha North segment. 6506/12-6 was classified as an appraisal well, and designed to further examine the hydrocarbon potential, of the Alpha South segment. The primary objectives were to verify the structural interpretation of the segment, and to define hydrocarbon-water contacts.Primary targets were the Fangst and BÅt Group sandstones and the upper Cromer Knoll Group sandstone unit (Lysing Formation). Prognosed depth was 4780 m.Operations and resultsAppraisal well 6506/12-6 was spudded with the semi-submersible installation Dyvi Delta on 31 March 1986 and drilled to TD at 4741 m, 6 m into Early Jurassic sediments of the Åre Formation. The 26" section was drilled first as a 12 1/4" pilot hole and then opened up with a 26" underreamer. At 777 m a survey indicated that the 26" hole was deviated from the pilot hole. After pulling out of hole and successfully reaming into the old pilot, the hole was opened up first to 17 1/2" bit, and then to 26". This was drilled to 1078 m before it was realised that the bit had again entered the deviated hole. After reaming suspected kick-off point drilling finally commenced in the vertical path to casing point. No further significant drilling problems occurred. The well was drilled with seawater down to 414m, with gypsum/polymer mud from 414 m to 1056 m, and with gypsum/polymer/lignite mud from 1056 m to TDThe Lysing Formation sandstone was penetrated from 3248 m to 3271 m. Well samples from this interval had weak shows (fluorescence but no cut). Top Shetland Group came in at 2331 m, top Cromer Knoll Group at 3274 m, and top Spekk Formation 4021 m. Top reservoir was encountered at 4230 m. The whole section from top reservoir through the BÅt Group had shows. Moveable hydrocarbons were encountered in Middle Jurassic sandstones (Ile Formation) and in sandstones of Lower Jurassic age (Tilje Formation). RFT-pressure points from this well and 6506/12-1, indicated an oil/water contact in the Garn Formation outside well position, between 4117 and 4150 m. No contacts were observed in the Ile Formation, which was interpreted as completely hydrocarbon-filled in this well. The fluid type in the Tofte Formation was uncertain since the formation was too tight for production to surface. The Tilje Formation consisted of interbedded sandstones, which appeared to be of different pressure regimes.A total of 302 m core was cut in 13 cores from the Melke - Garn, Ile, Tofte - Ror, and Tilje Formations within the interval 4184 - 4634 m. RFT fluid samples were taken at 4271.5 m in the Garn Formation, and at 4644.7 m, 4518.2 m, and 4680 m in the Tilje Formation.The well was permanently abandoned on 2 August 1986 as a gas/condensate appraisal well.TestingFour drill stem tests were carried out in the Fangst and BÅt Group reservoir intervals.DST No. 1 (4514 - 4525 m and 4549 - 4592 m) tested two separate zones in the Tilje Formation. PLT-log interpretation indicated water production from the upper zone. The uppermost 3 m of the lower zone produced oil and gas.DST No. 2 (4464 - 4493 m) proved tight formation in the lower part of the Tofte Formation, and no formation fluids was produced to the surface.DST No. 3 (4312 - 4352 m) in the Ile Formation produced gas and condensateDST No. 4 (4237 - 4245 m and 4255 - 4277 m) tested two separate zones in the Garn Formation. Both produced water with some associated gas. -
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]420.004741.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14184.04210.0[m ]24210.04230.0[m ]34230.04242.9[m ]44243.04266.5[m ]54312.04336.3[m ]64339.04367.0[m ]74435.54463.0[m ]84463.04488.2[m ]94490.04517.3[m ]104517.04543.5[m ]114552.04578.7[m ]124587.04607.0[m ]134607.04634.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]315.3Cores 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 availableDSTTEST14485.004496.0002.07.1986 - 15:40YESDSTTEST34283.004323.0016.07.1986 - 08:45YES -
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 typeCONDUCTOR30412.036949.00.00LOTSURF.COND.201046.0261078.01.62LOTINTERM.13 3/82249.017 1/22408.01.87LOTINTERM.9 5/84150.012 1/44161.02.07LOTLINER74740.08 1/24741.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0451445259.51.1454945929.51.2451445259.51.3454945929.51.4451445250.01.5454945920.01.6451445259.51.7454945929.51.84514452512.71.94549459212.72.0446444936.42.1446444936.43.04312435220.6Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.018.00010.0001581.118.00010.0001.218.00010.0001.318.00010.0001.418.0001.518.0001.66.0001.76.0001.818.0006.00026.0001.918.0006.00026.0002.02.144.00036.0003.013.00040.000154Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0128410000.8190.7653451.1128580000.8194101.2128440000.8193451.3128440000.8193451.41.51.6100150000.8191531.7100150000.8191531.8155700000.8204561.9155700000.8204562.02.13.03766100000.7831622 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR9242245CBL VDL GR20974750CBL VDL GR39614656CDL CNS GR412948CDL CNS GR22454744DIL BCS GR2811064DIL BCS GR22454744DLL MSF GR41564744FED GR41544743LDL CNL GR41504744MWD DLWD - GR RES DIR4124435MWD DLWD - GR RES DIR46344741RFT GR42604680RFT GR45174519RFT GR46444646RFT GR46794683RLL41504540SFT GR42384642VSP14604741 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit30130114631880188021752175228123312331256829303248324832714021402140504234423442794311441044104436449345154735 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.63 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf5.09 -
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]pdf15.19 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4231.1242.08.0WATERBASED07.04.19865301.1450.017.0WATERBASED09.04.19865381.1242.08.0WATERBASED07.04.19865380.0041.080.0WATERBASED07.04.19865561.1240.07.0WATERBASED07.04.19869011.5568.04.9WATERBASED31.07.19869121.7083.07.0WATERBASED30.07.19869490.0042.011.5WATERBASED07.04.19869491.1441.08.0WATERBASED07.04.198610651.1642.010.0WATERBASED08.04.198610781.3040.014.0WATERBASED16.04.198610780.0045.024.0WATERBASED17.04.198610951.1314.025.0WATERBASED21.04.198612921.1411.012.0WATERBASED21.04.198615341.2012.013.0WATERBASED23.04.198620811.3512.013.0WATERBASED25.04.198621031.7025.013.0WATERBASED05.05.198621471.4522.012.0WATERBASED25.04.198622651.5521.013.0WATERBASED25.04.198622650.0022.012.0WATERBASED28.04.198622650.0023.013.0WATERBASED28.04.198623101.5520.08.0WATERBASED28.04.198623961.6522.012.0WATERBASED28.04.198624971.7020.025.0WATERBASED29.04.198626231.7025.010.0WATERBASED29.04.198626311.7023.010.0WATERBASED29.04.198627531.7023.010.0WATERBASED30.04.198628541.7025.012.0WATERBASED30.04.198628761.7024.011.0WATERBASED02.05.198629351.5021.011.0WATERBASED02.05.198629350.0021.011.0WATERBASED02.05.198629661.7023.010.0WATERBASED02.05.198630621.7027.013.0WATERBASED05.05.198631431.7028.013.0WATERBASED05.05.198631891.7026.013.0WATERBASED05.05.198631911.7034.012.0WATERBASED05.05.198632051.7029.014.0WATERBASED05.05.198632301.7028.012.0WATERBASED06.05.198632711.7024.012.0WATERBASED06.05.198632891.7027.011.0WATERBASED07.05.198633181.7022.010.0WATERBASED09.05.198634651.7019.010.0WATERBASED09.05.198637241.7020.010.0WATERBASED12.05.198637240.0020.010.0WATERBASED13.05.198638821.7022.08.0WATERBASED14.05.198638820.0026.012.6WATERBASED16.05.198639181.7080.04.9WATERBASED28.07.198639381.7023.08.0WATERBASED16.05.198639861.7024.010.6WATERBASED16.05.198640011.2280.05.6WATERBASED28.07.198640601.7024.010.6WATERBASED16.05.198640891.7025.011.0WATERBASED16.05.198641301.7024.09.3WATERBASED16.05.198641401.701.711.0WATERBASED21.05.198641601.7024.010.0WATERBASED22.05.198641600.0025.09.0WATERBASED23.05.198641611.5819.07.0WATERBASED26.05.198641811.4314.05.6WATERBASED05.06.198641871.3012.06.3WATERBASED05.06.198642021.2062.04.2WATERBASED28.07.198642121.3013.07.0WATERBASED05.06.198642391.3014.06.7WATERBASED05.06.198642571.2052.04.2WATERBASED21.07.198642661.3015.06.7WATERBASED05.06.198642871.2051.03.5WATERBASED22.07.198642870.0050.03.5WATERBASED23.07.198642870.0053.02.8WATERBASED24.07.198642870.0051.02.8WATERBASED28.07.198642901.2015.07.7WATERBASED05.06.198643171.2015.07.0WATER BASED05.06.198643391.2015.07.0WATERBASED05.06.198643711.2014.07.0WATERBASED05.06.198644001.2058.06.3WATER BASED13.07.198644000.0050.08.4WATERBASED13.07.198644000.0054.03.5WATERBASED14.07.198644000.0045.04.2WATERBASED15.07.198644000.0047.04.2WATERBASED16.07.198644000.0045.03.5WATERBASED17.07.198644000.0053.04.2WATERBASED20.07.198644000.0046.04.2WATERBASED20.07.198644000.0045.04.2WATERBASED20.07.198644351.20160.07.0WATERBASED05.06.198644801.2016.07.0WATERBASED08.06.198644931.2070.06.3WATER BASED13.07.198645081.2055.07.2WATER BASED06.07.198645081.2050.06.7WATER BASED07.07.198645111.2016.07.0WATERBASED08.06.198645411.2016.06.3WATERBASED08.06.198645521.2016.06.3WATERBASED09.06.198645791.2017.06.3WATERBASED11.06.198646071.2018.06.3WATERBASED12.06.198646731.2018.07.0WATERBASED15.06.198647411.2019.07.0WATERBASED15.06.198647410.0018.07.0WATERBASED15.06.198647410.0018.05.6WATERBASED16.06.198647410.0018.05.6WATERBASED17.06.198647410.0018.05.6WATERBASED18.06.198647410.0024.06.3WATERBASED19.06.198647410.0024.07.0WATERBASED23.06.198647410.0022.06.3WATERBASED23.06.198647410.0022.05.6WATERBASED23.06.198647410.0022.07.0WATERBASED24.06.198647410.0017.04.9WATERBASED25.06.198647410.0015.04.2WATERBASED26.06.198647410.0015.03.5WATERBASED30.06.198647410.0055.04.9WATERBASED30.06.198647410.0016.04.2WATERBASED30.06.198647410.0018.05.6WATERBASED01.07.198647410.0016.04.9WATERBASED02.07.198647410.0017.04.2WATERBASED04.07.198647410.0024.06.3WATERBASED24.06.198647410.0017.04.9WATERBASED30.06.198647410.0016.02.8WATERBASED06.07.1986 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory4438.9[m]CRRI4443.8[m]CRRI4448.5[m]CRRI4454.7[m]CRRI4457.4[m]CRRI4459.7[m]CRRI