7120/9-1
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General information
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Wellbore history
GeneralWell 7120/9-1 was drilled in the Hammerfest Basin. The primary objective of the well was to test sandstone reservoirs of Early to Middle Jurassic age at a location very close to the highest position of the prospective structure.The well was to be drilled into sediments of Triassic age to a prognosed depth of 2180 m +100/-130.Operations and resultsExploration well 7120/9-1 was spudded with the semi-submersible installation Treasure Scout on 25July 1982 and drilled to TD at 2300 m in the Triassic Snadd Formation. The 36" section was drilled with a 17 1/2" bit followed by a 36" hole opener. Low penetration rates were encountered due to the over-compacted nature of the clay formation together with the presence of numerous erratic glacial boulders. The hole had to be reamed 3 times before the 30" casing was set. After that drilling proceeded without major problems. The 36" section was drilled with mud left from the previous well (7117/9-1). The 26" section down to 760 m was drilled with seawater and prehydrated bentonite. From 760 m to 1651 m the well was drilled with gypsum/"Milpolymer 302" mud, and from 1651 m to TD the well was drilled with "Milpolymer 302".The main reservoir was found hydrocarbon bearing from 1840.5 m (Top Stø Formation) down to the gas/water contact at 1904 m, eight meter into the Nordmela Formation. This interval consists of fine to medium, occasionally coarse sandstones with a few thin claystone stringers. RFT pressure recordings and sampling were performed over the interval. This gave a clear gas gradient of 0.084 psi/ft down to 1904 m with an underlying water gradient of 0.48 psi/ft. Weak to good shows were reported in sandstones in the interval from 1904 m in the lower part of the Early Jurassic and into the Triassic at TD. The water saturation in this interval ranged from 50-100% and based on log interpretation the hydrocarbons were assumed non-moveable.The pore pressure recordings and estimates in the well showed a normal pressure gradient down to ca. 1000 m, below which a slight pressure build up was estimated reaching a maximum recorded pressure of 1.14 r.d. at 1840.5 m. No further over pressured zones were noted. Seven cores were taken in the 12 1/4" section. Two segregated RFT samples were taken at 1842.5 m and 1900.5 m, both recovered dry gas.The well was permanently abandoned as gas discovery on 26 September 1982.TestingTwo production tests were conducted. DST no. 1 (1935-1939 m) was opened for initial flow on a 15.9 mm. choke but did not flow. The well was perforated again and flowed for 10 minutes during DST no. 2. After a one-hour build up period, the well was again opened for flow without result. The well was re-perforated in DST no. 2A (1858-1864 m and 1869-1874 m) and flowed initially for 10 minutes. After a one-hour build up period, the well was flowed. During the main flow period an ice plug formed in the tubing. Three sets of separator samples were taken during this flow period. DST no 2A produced 291700 Sm3/day of gas with a gravity of 0.72 (air=l) and 10.9 Sm3/day of 53.5° API condensate through a 52/64" choke. The GOR was ca. 27000 Sm3/Sm3 and the CO2 content was 6.5%. -
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]410.002300.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11843.01860.5[m ]21861.01879.2[m ]31879.61894.5[m ]41894.51912.2[m ]51912.21929.0[m ]61929.71947.4[m ]71950.11965.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]118.3Cores 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 typeLaboratory772.0[m]SWCIKU798.0[m]SWCIKU846.0[m]SWCIKU868.0[m]SWCIKU894.0[m]SWCIKU921.0[m]SWCIKU940.5[m]SWCIKU947.0[m]SWCIKU947.9[m]SWCIKU953.0[m]SWCIKU955.0[m]DC957.5[m]SWCIKU965.0[m]DC971.0[m]SWCIKU985.0[m]DC989.9[m]SWCIKU995.1[m]SWCIKU1003.5[m]SWCIKU1010.0[m]SWCIKU1015.0[m]DC1019.0[m]SWCIKU1033.0[m]SWCIKU1035.0[m]DC1048.0[m]SWCIKU1057.0[m]SWCIKU1065.0[m]DC1066.0[m]SWCIKU1089.0[m]SWCIKU1110.0[m]DC1117.0[m]SWCIKU1135.0[m]DC1144.0[m]SWCIKU1165.0[m]DC1193.0[m]SWCIKU1195.0[m]DC1215.0[m]DC1219.0[m]SWCIKU1240.0[m]SWCIKU1240.0[m]DC1266.0[m]SWCIKU1280.0[m]DC1288.5[m]SWCIKU1310.0[m]DC1314.0[m]SWCIKU1345.0[m]DC1347.0[m]SWCIKU1357.0[m]SWCIKU1370.0[m]SWCIKU1370.0[m]DC1392.0[m]SWCIKU1395.0[m]DC1407.0[m]SWCIKU1430.0[m]DC1435.0[m]SWCIKU1460.0[m]DC1464.0[m]SWCIKU1491.0[m]SWCIKU1495.0[m]DC1516.5[m]SWCIKU1525.0[m]DC1540.0[m]DC1550.0[m]DC1560.0[m]DC1563.0[m]SWCIKU1575.0[m]DC1580.0[m]DC1585.0[m]SWCIKU1592.0[m]SWCIKU1597.5[m]SWCIKU1605.0[m]DC1616.0[m]SWCIKU1640.0[m]DC1640.0[m]DC1641.0[m]SWCIKU1650.0[m]SWCIKU1673.0[m]DC1681.5[m]SWCIKU1690.0[m]SWCIKU1695.0[m]DC1697.0[m]SWCIKU1707.5[m]SWCIKU1712.0[m]SWCIKU1722.5[m]SWCIKU1733.0[m]DC1735.0[m]SWCIKU1750.0[m]DC1751.5[m]SWCIKU1754.0[m]SWCIKU1758.0[m]SWCIKU1761.0[m]SWCIKU1765.0[m]SWCIKU1772.0[m]SWCIKU1773.0[m]DC1780.0[m]SWCIKU1783.0[m]DC1788.0[m]DC1792.0[m]SWCIKU1808.0[m]DC1813.0[m]DC1814.5[m]SWCIKU1817.0[m]SWCIKU1818.0[m]DC1820.0[m]DC1824.0[m]SWCIKU1825.0[m]DC1828.0[m]SWCIKU1830.0[m]DC1832.5[m]SWCIKU1837.0[m]SWCIKU1840.0[m]DC1843.0[m]DC1843.8[m]CIKU1847.6[m]CIKU1856.4[m]CIKU1860.4[m]CIKU1862.7[m]CIKU1864.2[m]CIKU1866.7[m]CIKU1866.9[m]CIKU1867.5[m]CIKU1868.0[m]DC1870.0[m]DC1870.9[m]CIKU1875.0[m]DC1876.9[m]CIKU1884.7[m]CIKU1885.0[m]DC1886.8[m]CIKU1888.8[m]CIKU1894.9[m]CIKU1895.0[m]DC1897.4[m]CIKU1898.0[m]DC1901.4[m]CIKU1903.3[m]CIKU1912.0[m]CIKU1915.5[m]CIKU1917.4[m]CIKU1919.6[m]CIKU1921.2[m]CIKU1923.0[m]CIKU1923.8[m]CIKU1924.7[m]CIKU1925.7[m]CIKU1926.4[m]CIKU1928.1[m]CIKU1928.8[m]CIKU1930.6[m]CIKU1936.7[m]CIKU1937.0[m]SWCIKU1937.4[m]CIKU1938.1[m]CIKU1939.7[m]CIKU1941.9[m]CIKU1949.9[m]CIKU1950.2[m]CIKU1952.2[m]CIKU1955.6[m]CIKU1956.7[m]CIKU1957.9[m]CIKU1958.4[m]CIKU1959.3[m]CIKU1960.6[m]CIKU1962.8[m]CIKU1965.0[m]CIKU2000.0[m]DC2010.0[m]DC2012.0[m]SWCIKU2028.0[m]DC2040.0[m]DC2048.5[m]SWCIKU2060.0[m]DC2063.0[m]SWCIKU2075.0[m]DC2079.0[m]SWCIKU2083.0[m]DC2088.0[m]DC2100.0[m]DC2110.0[m]SWCIKU2118.0[m]SWCIKU2128.0[m]SWCIKU2130.0[m]DC2136.0[m]SWCIKU2141.0[m]SWCIKU2147.0[m]SWCIKU2155.0[m]SWCIKU2155.0[m]DC2162.0[m]SWCIKU2170.0[m]SWCIKU2190.0[m]DC2192.0[m]SWCIKU2220.0[m]DC2221.0[m]SWCIKU2247.0[m]DC2276.0[m]SWCIKU2285.0[m]SWCIKU2285.0[m]DC2289.0[m]DC2289.0[m]SWCIKU2295.0[m]SWCIKU2297.0[m]DC -
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 availableDSTDST2A1869.001874.0017.09.1982 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit343590590965965984984160717611813184018401896198620772173 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.42 -
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]pdf9.12pdf2.81 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0193519360.02.01858186420.6Drill 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]1.02.0112910000.7640.72026697 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL4401646CDT16751837CST7721089CST11171650CST19372295DLL MSFL GR CAL SP16501966HDT7442295ISF LSS GR SP4041653ISF LSS GR SP18002297ISF LSS GR SP MSFL CAL16511965LDT CNL GR CAL3901966LDT CNL NGT GR CAL19352297NGT16502297RFT18401943RFT19001900RFT19002226RFT19001901RFT19352270VELOCITY5582300 -
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 typeCONDUCTOR30404.036405.00.00LOTSURF.COND.20744.026760.01.67LOTINTERM.13 3/81651.017 1/21665.01.80LOTINTERM.9 5/82300.012 1/42300.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured7661.06seawater12161.1532.09.0seawater16651.2050.010.5seawater18211.2141.08.0seawater20591.2246.010.0seawater22851.2550.011.5seawater -
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