6507/8-4
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General information
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Wellbore history
GeneralWell 6507/8-4 was designed to drill the Heidrun North Structure, a horst block northeast of the Heidrun Field situated in the transition zone between the Nordland Ridge to the north and the Halten Terrace to the southwest. The primary objective of the well was to test sandstones of Early Jurassic age. The well would also test the geophysical and structural interpretation and improve the paleontological, geological and geochemical understanding of the area.Shallow gas warning was given at 608 m, 745 m and 686 m, the last one classified as a medium/ high risk anomaly. Problems with gumbo clay and sloughing shale had been experienced in the Eocene / Paleocene sections in the Haltenbanken area.Operations and resultsWildcat well 6507/8-4 was spudded with the semi-submersible installation Deepsea Bergen on 14 June 1990 and drilled to TD at 2560 m in the Triassic Grey Beds. Apart from some tight hole spots, drilling proceeded without significant problems. The well was drilled with seawater and hi-vis sweeps down to 654 m, with seawater and CMC EHV mud from 654 m to 1555 m, with gypsum/polymer mud from 1555 m to 2100 m, and with gel/ligno mud from 2100 m to TD. Shallow gas was encountered at 596 m and at 686 m.The only shows reported above the target reservoir were on claystones at 2102 m and at 2104 m. Top reservoir (Åre Formation) was encountered directly underlying Late Cretaceous sediments at 2124 m. The hiatus was from the Early Jurassic, Sinemurian to the Late Cretaceous, Santonian. The well proved gas and oil in the Åre formation. The GOC was set at 2142 m and the OWC at 2251.5 m. Shows continued down to 2290 m.A total of 170.25 m core was recovered in eleven cores, all from the Åre Formation in the interval 2128 to 2318 m. Twenty-five sidewall cores were attempted and 22 were recovered. An FMT fluid sample was taken at 2158.5 m. It contained only 500 cc mud filtrate due to plugging. Another sample was taken at 2133.7 m and contained oil, mud filtrate and some water.The well was abandoned on 13 August 1990 as a gas and oil discovery.TestingA number of tests were performed in the Åre Formation.No 1 tested the interval 2250 to 2254 m. The interval produced only small quantities of water.No 2 tested two intervals.Test 2.1 tested the interval 2200 to 2202 m, which produced 1023.8 Sm3 oil and 58700 Sm3 gas /day through a 48/64" choke. The GOR was 59 Sm3/Sm3, the oil gravity was 0.905 g/cm3 (24.9 deg API), and the gas gravity was 0.644 (air = 1). The bottom hole temperature was 76 deg C.Test 2.2 tested the interval 2204 to 2221 m, which produced 1395.3 Sm3 oil and 60900 Sm3 gas /day through a 52/64" choke. The GOR was 51 Sm3/Sm3, the oil gravity was 0.904 g/cm3 (25 deg API), and the gas gravity was 0.642 (air = 1). The bottom hole temperature was 76 deg C.No 3 tested two intervals.Test no 3.1 tested the interval 2150 to 2161.5 m, which produced 1480 Sm3 oil and 70100 Sm3 gas /day through a 56/64" choke. The GOR was 61 Sm3/Sm3, the oil gravity was 0.904 g/cm3 (25 deg API), and the gas gravity was 0.635 (air = 1). The bottom hole temperature was 75 deg C.Test no 3.2 tested the interval 2163.5 to 2168 m, which produced 986 Sm3 oil and 45300 Sm3 gas /day through a 40/64" choke. The GOR was 56 Sm3/Sm3, the oil gravity was 0.904 g/cm3 (25 deg API), and the gas gravity was 0.635 (air = 1). The bottom hole temperature was 75.5 deg C.No 4 tested the interval 2126 to 2135 m which produced 16.1 Sm3 condensate and 756777 Sm3 Gas /day through a 40/64" choke. The GOR was 47078 Sm3/Sm3, the condensate gravity was 0.78 g/cm3 (49.9 deg API), and the gas gravity was 0.648 (air = 1). The bottom hole temperature was 73.8 deg C.All tests produced sand, filling up the separator several times. -
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]584.002560.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12128.02150.0[m ]22155.02171.0[m ]32172.02185.0[m ]42185.02198.0[m ]52200.02205.0[m ]62207.02226.0[m ]72227.02245.0[m ]82246.02264.0[m ]92265.02291.2[m ]102292.02295.6[m ]112301.02317.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]170.3Cores 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 typeLaboratory1504.0[m]DCSTRAT1554.0[m]DCSTRAT1574.0[m]DCSTRAT1594.0[m]DCSTRAT1654.0[m]DCSTRAT1704.0[m]DCSTRAT1714.0[m]DCSTRAT1721.0[m]SWCSTATO1734.0[m]DCSTRAT1754.0[m]DCSTRAT1779.0[m]DCSTATO1784.0[m]DCSTRAT1794.0[m]DCSTRAT1810.0[m]SWCSTATO1830.0[m]SWCSTATO1840.0[m]SWCSTATO1850.0[m]DCSTRAT1858.0[m]SWCSTATO1870.0[m]DCSTRAT1880.0[m]SWCSTATO1890.0[m]DCSTRAT1900.0[m]SWCSTATO1910.0[m]DCSTRAT1920.0[m]SWCSTATO1925.0[m]DCSTRAT1940.0[m]SWCSTATO1950.0[m]SWCSTATO1962.0[m]SWCSTATO1970.0[m]SWCSTATO1980.0[m]DCSTRAT1986.0[m]SWCSTATO1990.0[m]DCSTRAT2000.0[m]SWCSTATO2014.0[m]SWCSTATO2020.0[m]SWCSTATO2025.0[m]DCSTRAT2030.0[m]SWCSTATO2040.0[m]SWCSTATO2050.0[m]SWCSTATO2065.0[m]DCSTRAT2070.0[m]DCSTATO2080.0[m]DCSTRAT2092.0[m]DCSTRAT2110.0[m]DCSTRAT2125.0[m]DCSTRAT2132.2[m]CSTATO2133.5[m]CSTATO2136.4[m]CSTATO2144.0[m]CSTATO2149.7[m]CSTATO2163.5[m]CSTATO2172.4[m]CSTATO2177.5[m]CSTATO2182.8[m]CSTATO2186.3[m]CSTATO2188.4[m]CSTATO2195.7[m]CSTATO2202.8[m]CSTATO2209.4[m]CSTATO2214.7[m]CSTATO2222.5[m]CSTATO2228.5[m]CSTATO2232.9[m]CSTATO2237.8[m]CSTATO2243.6[m]CSTATO2246.8[m]CSTATO2246.8[m]CSTATO2251.4[m]CSTATO2252.0[m]CSTATO2257.4[m]CSTATO2259.6[m]CSTATO2261.3[m]CSTATO2281.3[m]CSTATO2283.7[m]CSTATO2290.7[m]CSTATO2303.3[m]CSTATO2307.6[m]CSTATO2311.4[m]CSTATO2313.1[m]CSTATO2314.5[m]CSTATO2320.0[m]DCSTRAT2335.0[m]DCSTRAT2356.0[m]DCSTRAT2368.0[m]DCSTRAT2380.0[m]DCSTRAT2398.0[m]DCSTRAT2410.0[m]DCSTRAT2428.0[m]DCSTRAT2446.0[m]DCSTRAT2458.0[m]DCSTRAT2473.0[m]DCSTRAT2488.0[m]DCSTRAT2503.0[m]DCSTRAT2518.0[m]DCSTRAT2534.0[m]DCSTRAT2545.0[m]DCSTRAT2552.0[m]DCSTRAT2560.0[m]DCSTRAT2560.0[m]DCSTATO -
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 availableDSTTEST22200.002221.0025.07.1990 - 12:00YESDSTTEST32163.502168.0030.07.1990 - 23:00YESDSTTEST42126.002135.0007.08.1990 - 23:55YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3771455178817881951195119742018212421242435 -
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]pdf15.29 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02250225412.71.1225022546.32.02200222112.73.02150216819.13.12163216822.24.02126213515.9Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.12.03.03.14.056.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01.12.01024587000.9000.685593.0986453000.9080.635553.11480701000.9080.634614.0167567770.7800.64847078 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR3771534CBL VDL GR10462081CBL VDL GR18352490CDL CNL GR20812543CDL GR3771538CDL GR15342078DIFL ACL GR CAL3772560DIPLOG20752552FMT GR21252298MWD - GR RES DIR4372560SWC17212088VELOCITY7002500 -
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 typeCONDUCTOR30437.036441.00.00LOTINTERM.20564.726574.01.32LOTINTERM.13 3/81533.017 1/21555.01.66LOTINTERM.9 5/82084.012 1/42100.01.77LOTLINER72546.08 1/22560.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured11011.2010.05.0WATER BASED25.06.199015501.207.03.0WATER BASED28.06.199015551.2210.05.0WATER BASED25.06.199015551.207.03.5WATER BASED26.06.199015551.187.03.5WATER BASED27.06.199017701.3516.06.0WATER BASED28.06.199018501.3518.07.0WATER BASED02.07.199018501.3519.05.5WATER BASED04.07.199018501.35WATER BASED09.07.199018501.35WATER BASED04.07.199018501.35WATER BASED04.07.199018801.3519.06.0WATER BASED04.07.199021001.3819.06.0WATER BASED04.07.199021001.4519.05.5WATER BASED04.07.199021001.3818.07.0WATER BASED02.07.199021001.45WATER BASED04.07.199021001.45WATER BASED04.07.199021001.3020.03.5WATER BASED09.07.199021001.30WATER BASED09.07.199021001.30WATER BASED09.07.199021001.3024.07.5WATER BASED09.07.199021001.3020.05.0WATER BASED09.07.199021001.3026.06.5WATER BASED09.07.199021001.3034.07.0WATER BASED10.07.199021001.3037.06.5WATER BASED11.07.199021001.3028.03.5WATER BASED12.07.199021001.3022.09.0WATER BASED16.07.199021001.4119.06.0WATER BASED04.07.199021301.3023.03.5WATER BASED16.07.199021301.187.03.0WATER BASED09.08.199021301.18WATER BASED10.08.199021301.187.03.0WATER BASED10.08.199021551.30WATER BASED09.07.199021601.1810.03.5WATER BASED30.07.199021601.1810.03.5WATER BASED31.07.199021601.1810.03.5WATER BASED02.08.199021601.1810.03.5WATER BASED03.08.199021601.188.03.5WATER BASED06.08.199021601.1810.03.5WATER BASED02.08.199021601.1810.03.5WATER BASED06.08.199021851.3020.03.5WATER BASED09.07.199022011.3023.03.5WATER BASED16.07.199022011.1813.03.5WATER BASED24.07.199022011.1813.03.5WATER BASED26.07.199022011.1811.03.5WATER BASED27.07.199022171.1811.04.0WATER BASED30.07.199022171.1811.04.0WATER BASED30.07.199022171.1811.03.5WATER BASED30.07.199022271.3024.07.5WATER BASED09.07.199022461.3023.03.5WATER BASED16.07.199022521.1814.03.5WATER BASED23.07.199022521.1814.07.0WATER BASED23.07.199022521.1814.03.5WATER BASED23.07.199022651.3020.05.0WATER BASED09.07.199023071.3026.06.5WATER BASED09.07.199024111.3034.07.0WATER BASED10.07.199025341.3037.06.5WATER BASED11.07.199025601.3022.09.0WATER BASED16.07.199025601.3028.03.5WATER BASED12.07.1990 -
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]pdf0.27