16/2-5
Export: PDF
-
General information
-
Wellbore history
GeneralWell 16/2-5 was drilled on the Ragnarock III prospect on the Utsira High in the North Sea. The primary objective of the well was to prove the presence of hydrocarbons in the pre-BCU interval and establish the composition and age of the sediments. The secondary target was the chalk in the Ekofisk and Tor Formations of Late Cretaceous age. The presence of hydrocarbons in these formations at the well location was possible, but not expected.Operations and resultsWildcat well 16/2-5 was spudded with the jack-up installation West Epsilon on 22 February 2009 and drilled to TD at 2373 m in pre-Devonian Basement. After drilling the 36" hole to 288 m a 9 7/8" pilot hole was drilled to 513 m to check for shallow gas. No shallow gas or shallow water flow was observed. The well was drilled with spud mud down to 519 m, with KCl/polymer/glycol mud from 519 m to 1747 m, and with KCl/polymer/glycol low-sulphate mud from 1747 m to TD.The well penetrated rocks of Quaternary, Tertiary and Cretaceous age, it then penetrated Graben Fill before TD in Basement. Base Cretaceous/top Graben Fill was encountered at 1884 m. A total thickness of 458 m of Graben Fill consisting of coarse, clastic sediments was penetrated and 3 cores were cut from 1894 to 1994 m. Due to lack of fossils no reliable dating was obtained for the Graben Fill. The Graben Fill was gas/condensate filled from top of the reservoir and down to 1902 m. High quality gas condensate samples were acquired by use of wire line sampling tools. A water sample was acquired at 1935 m and oil was scanned at 1916 m MD. An interval with oil was confirmed also by sampling at 1921.5 m, but due to poor pressure measurements in this interval the OWC was only tentatively set at 1917 m based on logs and geochemistry. No oil shows were observed above reservoir level. In the reservoir oil shows were seen down to 1981 m and no shows were seen below this level.The well was permanently abandoned on 13 May 2009 as a gas discovery.TestingA full scale DST was performed in the interval 1885 - 1902 m. The perforated interval was placed in the gas zone with the lowermost interval close to the interpreted GOC. The gas rate for the main flow was 110 000 Sm3/d with a 40/64" choke size. A maximum gas rate of 120 000 Sm3/day was achieved on a 60/64" choke size. The total test production of associated condensate with the gas was about 6 Sm3 mixed with some oil, no water was produced during testing. At top reservoir the formation pressure was 191.8 bar at 1885 m. The bottom hole temperature recorded in the test was 71 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]300.002373.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11894.01947.3[m ]21948.01966.9[m ]31967.01992.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]97.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory600.0[m]DCNETWORK620.0[m]DCNETWOR645.0[m]DCNETWOR660.0[m]DCNETWOR680.0[m]DCNETWOR700.0[m]DCNETWOR720.0[m]DCNETWOR740.0[m]DCNETWOR760.0[m]DCNETWOR780.0[m]DCNETWOR800.0[m]DCNETWOR810.0[m]DCNETWOR820.0[m]DCNETWOR830.0[m]DCNETWOR840.0[m]DCNETWOR850.0[m]DCNETWOR860.0[m]DCNETWOR870.0[m]DCNETWOR880.0[m]DCNETWOR890.0[m]DCNETWOR900.0[m]DCNETWOR910.0[m]DCNETWOR920.0[m]DCNETWOR930.0[m]DCNETWOR940.0[m]DCNETWOR950.0[m]DCNETWOR960.0[m]DCNETWOR970.0[m]DCNETWOR980.0[m]DCNETWOR990.0[m]DCNETWOR1000.0[m]DCNETWOR1010.0[m]DCNETWOR1020.0[m]DCNETWOR1030.0[m]DCNETWOR1050.0[m]DCNETWOR1070.0[m]DCNETWOR1090.0[m]DCNETWOR1110.0[m]DCNETWOR1130.0[m]DCNETWOR1150.0[m]DCNETWOR1170.0[m]DCNETWOR1190.0[m]DCNETWOR1210.0[m]DCNETWOR1230.0[m]DCNETWOR1250.0[m]DCNETWOR1270.0[m]DCNETWOR1290.0[m]DCNETWOR1310.0[m]DCNETWOR1330.0[m]DCNETWOR1350.0[m]DCNETWOR1370.0[m]DCNETWOR1390.0[m]DCNETWOR1410.0[m]DCNETWOR1430.0[m]DCNETWOR1450.0[m]DCNETWOR1470.0[m]DCNETWOR1490.0[m]DCNETWOR1510.0[m]DCNETWOR1530.0[m]DCNETWOR1550.0[m]DCNETWOR1570.0[m]DCNETWOR1590.0[m]DCNETWOR1610.0[m]DCNETWOR1630.0[m]DCNETWOR1640.0[m]DCNETWOR1650.0[m]DCNETWOR1660.0[m]DCNETWOR1670.0[m]DCNETWOR1680.0[m]DCNETWOR1690.0[m]DCNETWOR1700.0[m]DCNETWOR1710.0[m]DCNETWOR1720.0[m]DCNETWOR1730.0[m]DCNETWOR1740.0[m]DCNETWOR1746.0[m]DCNETWOR1752.0[m]DCNETWOR1761.0[m]DCNETWOR1767.0[m]DCNETWOR1773.0[m]DCNETWOR1779.0[m]DCNETWOR1785.0[m]DCNETWOR1791.0[m]DCNETWOR1800.0[m]DCNETWOR1806.0[m]DCNETWOR1812.0[m]DCNETWOR1818.0[m]DCNETWOR1827.0[m]DCNETWOR1836.0[m]DCNETWOR1842.0[m]DCNETWOR1848.0[m]DCNETWOR1854.0[m]DCNETWOR1860.0[m]DCNETWOR1866.0[m]DCNETWOR1872.0[m]DCNETWOR1878.0[m]DCNETWOR1884.0[m]DCNETWOR1890.0[m]DCNETWOR1895.9[m]CNETWOR1899.6[m]CNETWOR1901.8[m]CNETWOR1907.8[m]CNETWOR1915.6[m]CNETWOR1916.0[m]CNETWOR1919.9[m]CNETWOR1922.8[m]CNETWOR1930.7[m]CNETWOR1941.2[m]CNETWOR1948.0[m]CNETWOR1953.5[m]CNETWOR1962.4[m]CNETWOR1965.4[m]CNETWOR1965.8[m]CNETWOR1966.5[m]CNETWOR1967.0[m]CNETWOR1971.3[m]CNETWOR1973.7[m]CNETWOR1979.1[m]CNETWOR1983.6[m]CNETWOR1987.6[m]CNETWOR1989.7[m]CNETWOR1995.0[m]DCNETWOR2001.0[m]DCNETWOR2007.0[m]DCNETWOR2013.0[m]DCNETWOR2019.0[m]DCNETWOR2025.0[m]DCNETWOR2031.0[m]DCNETWOR2037.0[m]DCNETWOR2043.0[m]DCNETWOR2049.0[m]DCNETWOR2055.0[m]DCNETWOR2061.0[m]DCNETWOR2067.0[m]DCNETWOR2076.0[m]DCNETWOR2082.0[m]DCNETWOR2088.0[m]DCNETWOR2094.0[m]DCNETWOR2100.0[m]DCNETWOR2106.0[m]DCNETWOR2112.0[m]DCNETWOR2118.0[m]DCNETWOR2124.0[m]DCNETWOR2130.0[m]DCNETWOR2136.0[m]DCNETWOR2142.0[m]DCNETWOR2148.0[m]DCNETWOR2154.0[m]DCNETWOR2160.0[m]DCNETWOR2163.0[m]DCNETWOR2166.0[m]DCNETWOR2169.0[m]DCNETWOR2172.0[m]DCNETWOR2175.0[m]DCNETWOR2178.0[m]DCNETWOR2181.0[m]DCNETWOR2184.0[m]DCNETWOR2187.0[m]DCNETWOR2190.0[m]DCNETWOR2193.0[m]DCNETWOR2196.0[m]DCNETWOR2202.0[m]DCNETWOR2205.0[m]DCNETWOR2208.0[m]DCNETWOR2214.0[m]DCNETWOR2220.0[m]DCNETWOR2226.0[m]DCNETWOR2232.0[m]DCNETWOR2238.0[m]DCNETWOR2244.0[m]DCNETWOR2250.0[m]DCNETWOR2256.0[m]DCNETWOR2262.0[m]DCNETWOR2268.0[m]DCNETWOR2277.0[m]DCNETWOR2283.0[m]DCNETWOR2289.0[m]DCNETWOR2295.0[m]DCNETWOR2301.0[m]DCNETWOR2307.0[m]DCNETWOR2316.0[m]DCNETWOR2328.0[m]DCNETWOR2334.0[m]DCNETWOR2340.0[m]DCNETWOR -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit15879897199899810481077110211921242128713051631163116521672174817571757176218031855185518751880188418842342 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.48 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01885190223.8Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.019.00071Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0120000 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR HRLA PEX ECS17222363FMI SONIC SCANNER17222363MDT PRETEST17222340MDT-DP VIT-PB MINI DST17222030MDT-DP VIT-PB MINI DST17221899MDT-DP VIT-PB SPACING17221916MSCT17222348MWD LWD - ARCVRES8 PP289513MWD LWD - ARCVRES9 PP2891744MWD LWD - ARCVRS6 PP18802373MWD LWD - GVR6 ARCVRES6 PP17441894PEX HRLT SONIC SCANNER1571747UBI HNGS17222350ZOVSP3031717ZOVSP13992352 -
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 typeCONDUCTOR30281.036288.01.10LOTSURF.COND.20500.026519.01.51LOTINTERM.13 3/81734.017 1/21747.01.60LOTLINER72341.08 1/22373.01.49LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2981.0513.0Spud Mud3551.0515.0Spud Mud5131.1013.0Spud Mud5131.0516.0Spud Mud6271.2515.0KCl/Polymer/GEM16951.3524.0KCl/Polymer/GEM17441.3722.0KCl/Polymer/GEM19481.2020.0KCl/Polymer/Glycol23701.2022.0KCl/Polymer/Glycol23731.2028.0KCl/Polymer/Glycol23731.2022.0KCl/Polymer/Glycol -
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]pdf0.22