7220/11-1
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General information
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Wellbore history
GeneralWell 7220/11-1 was drilled on the Alta prospect on the southern part of the Loppa High in the Barents Sea. The primary objective was to test sandstones of the Triassic Kobbe Formation and Permian to Carboniferous carbonates of the Ørn Formation. The secondary objective was to test carbonates and sandstones of the Carboniferous Falk Formation.Operations and resultsWildcat well 7220/11-1 was spudded with the semi-submersible installation Island Innovator on 5th August 2014 and drilled to TD at 2251 m in the Late Carboniferous Ugle Formation. No significant problem was encountered in the operations. The well was drilled with seawater down to 588.4 m and with Aqua-Drill mud from 588.4 m to TD.Numerous shows, of variable quality, was described in thin sandstones in the upper part of the Triassic Snadd Formation (624 m, 727 - 737 m, 822 m, 845 - 9924 m, 1246 m, 1280 m, 1298 m, and 1329 - 1349 m). The well did not encounter reservoir quality in the primary Alta Kobbe Formation target. A 26 m thick Triassic conglomerate unit was encountered at 1897 m. This unit rests directly on carbonates of the Carboniferous Falk Formation. The Ørn Formation was not present in the well. The Triassic conglomerates and the Falk carbonates were found to be hydrocarbon bearing with a total column height of 57 m (11 m gas column over a 46 m oil leg). The gas/oil contact is interpreted to be at 1908.1 m. Organic geochemical analyses of the oil show an abundance of tricyclic terpanes combined with a light carbon isotopic composition, typical of the Barents region Triassic source rocks. The oil/water contact is interpreted to be at 1954 m. Below the Falk Formation the Ugle Formation had 122 m gross sandstones. These sandstones were described as clear translucent, occasionally yellowish-orange quartz (common moderate brown coating) with moderate brown to reddish brown argillaceous matrix. The grain size is mostly fine to medium, but up to coarse.The reservoir section was cored in four cores from 1904 m to 1977.5 m with 99 to 100% recovery. MDT fluid samples were taken at 1900.7 m (condensate), 1912.0 m (oil), 1919.5 m (oil), 1939.7 m (oil), 1986.8 m (water), and 1999.5 m (water).The well was permanently abandoned on 17 October 2014 as an oil and gas discovery.TestingThe well was perforated in two separate intervals in the Falk Formation (1934.8-1945.0 m) and the Triassic Conglomerates (1912.9-1921.4 m). While flowing from the lower perforations alone before acid stimulation, well productivity was low. After acid stimulation of the lower zone and perforation of the upper zone, a good productivity was achieved. The final flow rate was 520 Sm3/day oil and 48 600 Sm3/day gas through a 36/64 inch fixed choke; the GOR was 94 Sm3/Sm3, and the downhole temperature was 72.7 °C at 1935 m. -
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]600.002250.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11904.01928.0[m ]21928.01954.2[m ]31954.31964.0[m ]41964.01977.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]73.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 availableDST1A1946.501937.00OIL02.10.2014 - 00:00YESDST1B1921.001913.00OIL05.10.2014 - 00:00YES -
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 typeCONDUCTOR30486.036489.50.00SURF.COND.20588.426594.01.34FITPILOT HOLE594.09 7/8594.00.00INTERM.13 3/81196.017 1/21202.01.50FITINTERM.9 5/81764.112 1/41770.51.50FITLINER72049.88 1/22251.00.00 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01935194514.32.01913192114.3Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0422.046Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.051849000952.05304800090 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CCL GR SBT VDL13371754GR GEOW7532238MRCH JAR GR PCOR17772219MRCH JAR TTRM DSL CN ZDL ORIT XM17522214MRCH JAR TTRM DSL FLEX MREX18692011MRCH JAR TTRM DSL FLEX MREX18902108MRCH JAR TTRM DSL STAR ORIT UXPL11961753MRCH JAR TTRM DSL STAR ORIT UXPL17622239MRCH JAR TTRM RLVP RCX GR13281340MWD - ATK MXT OTK SDTK CCN ORD Z10821770MWD - MXT OTK SDTK ZTK BCPM NBG5371202MWD - OTK BCPM418489MWD - OTK SDTK BCPM462592MWD - OTK SDTK CCN ORD BCPM II16942249SC PO SAT PQ IFA MS PC ADT GR18802210 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit41841844744755655658058018521852189518981898192319232118 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4651.4016.0Water Based4721.032.0Water Based4721.2011.0Water Based4901.03120.0Water Based5391.2011.0Water Based5941.407.0Water Based5941.2020.0Water Based5941.0320.0Water Based5981.1915.0Water Based8691.2117.0Water Based12021.2019.0Water Based16921.2016.0Water Based17741.1421.0Water Based19281.1618.0Water Based20511.141.0Brine20511.1611.0Water Based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory610.0[m]DCROBERTSO640.0[m]DCROBERT660.0[m]DCROBERT680.0[m]DCROBERT700.0[m]DCROBERT720.0[m]DCROBERT740.0[m]DCROBERT760.0[m]DCROBERT780.0[m]DCROBERT800.0[m]DCROBERT820.0[m]DCROBERT830.0[m]DCROBERT840.0[m]DCROBERT850.0[m]DCROBERT860.0[m]DCROBERT870.0[m]DCROBERT900.0[m]DCROBERT920.0[m]DCROBERT940.0[m]DCROBERT960.0[m]DCROBERT980.0[m]DCROBERT1000.0[m]DCROBERT1020.0[m]DCROBERT1040.0[m]DCROBERT1060.0[m]DCROBERT1080.0[m]DCROBERT1100.0[m]DCROBERT1120.0[m]DCROBERT1140.0[m]DCROBERT1160.0[m]DCROBERT1180.0[m]DCROBERT1202.0[m]DCROBERT1220.0[m]DCROBERT1240.0[m]DCROBERT1260.0[m]DCROBERT1280.0[m]DCROBERT1300.0[m]DCROBERT1320.0[m]DCROBERT1340.0[m]DCROBERT1360.0[m]DCROBERT1380.0[m]DCROBERT1400.0[m]DCROBERT1420.0[m]DCROBERT1440.0[m]DCROBERT1460.0[m]DCROBERT1480.0[m]DCROBERT1500.0[m]DCROBERT1520.0[m]DCROBERT1540.0[m]DCROBERT1560.0[m]DCROBERT1580.0[m]DCROBERT1600.0[m]DCROBERT1620.0[m]DCROBERT1640.0[m]DCROBERT1660.0[m]DCROBERT1680.0[m]DCROBERT1700.0[m]DCROBERT1720.0[m]DCROBERT1740.0[m]DCROBERT1760.0[m]DCROBERT1782.0[m]DCROBERT1800.0[m]DCROBERT1818.0[m]DCROBERT1836.0[m]DCROBERT1851.1[m]SWCROBERT1854.0[m]DCROBERT1859.9[m]SWCROBERT1863.0[m]DCROBERT1863.2[m]SWCROBERT1872.0[m]DCROBERT1873.0[m]SWCROBERT1881.0[m]DCROBERT1890.0[m]DCROBERT1895.6[m]SWCROBERT1896.5[m]SWCROBERT1899.0[m]DCROBERT1902.0[m]DCROBERT1904.2[m]CROBERT1905.5[m]CROBERT1906.6[m]CROBERT1908.8[m]CROBERT1909.6[m]CROBERT1910.3[m]CROBERT1911.3[m]CROBERT1912.7[m]CROBERT1913.6[m]CROBERT1914.5[m]CROBERT1915.4[m]CROBERT1916.0[m]CROBERT1917.9[m]CROBERT1918.5[m]CROBERT1919.2[m]CROBERT1919.4[m]CAPT1919.9[m]CAPT1920.5[m]CAPT1921.3[m]CROBERT1922.2[m]CROBERT1922.7[m]CAPT1923.3[m]CROBERT1924.2[m]CROBERT1924.7[m]CAPT1925.3[m]CROBERT1925.7[m]CROBERT1926.5[m]CROBERT1927.5[m]CROBERT1928.8[m]CROBERT1929.1[m]CROBERT1930.3[m]CROBERT1931.2[m]CROBERT1931.5[m]CROBERT1935.4[m]CROBERT1939.6[m]CROBERT1940.2[m]CROBERT1949.3[m]CROBERT1951.3[m]CROBERT1956.5[m]CROBERT1957.1[m]CROBERT1964.5[m]CROBERT1968.4[m]CROBERT1971.6[m]CROBERT1975.2[m]CROBERT1976.6[m]CROBERT1980.0[m]DCROBERT1998.0[m]DCROBERT2016.0[m]DCROBERT2022.0[m]DCROBERT2031.0[m]DCROBERT2058.0[m]DCROBERT2073.0[m]DCROBERT2091.0[m]DCROBERT2112.0[m]DCROBERT -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1906.30[m ]1907.60[m ]1915.82[m ]1918.28[m ]1923.01[m ]1924.25[m ]1930.80[m ]1935.72[m ]1936.60[m ]1941.75[m ]1946.55[m ]1949.27[m ]1950.77[m ]1951.35[m ]1953.55[m ]1954.57[m ]1959.10[m ]1960.20[m ]1963.83[m ]1965.20[m ]1971.72[m ]1973.35[m ]1974.18[m ]1976.89[m ]1977.35[m ]1988.00[m ]1902.00[m ]1977.00[m ]1983.00[m ]1989.00[m ]1995.00[m ]1998.00[m ]2001.00[m ]2004.00[m ]2007.00[m ]2013.00[m ]2016.00[m ]2019.00[m ]2022.00[m ]2025.00[m ]2031.00[m ]2034.00[m ]2037.00[m ]2043.00[m ]2049.00[m ]2055.00[m ]2061.00[m ]2067.00[m ]2073.00[m ]2076.00[m ]2079.00[m ]2085.00[m ]2091.00[m ]2097.00[m ]2100.00[m ]2103.00[m ]2106.00[m ]2109.00[m ]2112.00[m ]2118.00[m ]