16/5-5
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General information
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Wellbore history
GeneralWell 16/5-5 was drilled to test the southeast extension of the 16/4-6 S Luno discovery on the Utsira High in the North Sea. The primary objective was to prove the presence of reservoir in this area, to improve the understanding of the sedimentary sequence, and to confirm the OWC at 1950 m TVD MSL found in 16/4-6 S.Operations and resultsAppraisal well 16/5-5 was spudded with the semi-submersible installation Bredford Dolphin on 11 November 2013 and drilled to TD at 2085 m in the Triassic Hegre Group. No significant problem was encountered in the operations. The well was drilled with seawater and hi-vis pills down to 601 m and with Aquadril mud from 601 m to TD.The well penetrated a thick sequence consisting of alluvial deposits of predominantly Middle-Early Triassic age with top at 1936 m. The alluvial deposits show in general poor reservoir quality although a 25 m interval with improved quality is seen close to TD. The cored section is strongly fractured and appears to have penetrated several fault zones. The sandstones are partly filled with heavy biodegraded oil; however, in the upper part the section was too tight to establish a pressure gradient. The reservoir pressure in the water zone is close to hydrostatic pressure, 4 bar above the Luno II discovery well 16/4-6 S, indicating a barrier between these two wells.Six cores were cut in succession from 1937 to 1983.8 m, covering the Triassic to Early Cretaceous (Sola Fm) unconformity in the well and the upper 45 m of the Hegre Group. All six cores should be shifted -3.09 m to match with the logs in the well. RCX fluid sample were taken at 1938.8 m (water and trace heavy oil), 1939.9 m (water and trace heavy oil), 1940 m (water and trace heavy oil), 1977 m (water and trace heavy oil), and at 2034 m (water).The well was permanently abandoned on 29 December 2013 as a well with shows.TestingNo drill stem test was performed. -
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]600.002085.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11937.01945.8[m ]21945.81952.1[m ]31952.51957.9[m ]41958.51971.4[m ]51972.01977.7[m ]61977.71983.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]45.1Cores 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 availableMDT1977.000.00OILNO -
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 typeCONDUCTOR30203.036204.40.00SURF.COND.20590.026590.01.79LOTPILOT HOLE596.09 7/8596.00.00OPEN HOLE601.017 1/2601.00.00INTERM.9 5/81879.012 1/41888.01.50FITOPEN HOLE2085.08 1/22085.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR CN ZDL ZMAC ORIT RTEX MLL18782081GR FLEX MREX18782081GR MAXCOR19052020GR RCX IFX SENTINEL19362050GR RCX IFX SP19361970GR STAR ORIT UXPL18782075GR VSP11092069MWD-GR RES DIR CAL DEN NEU SON5571888MWD-GR RES PWD DIR CAL DEN NEU S18602084MWD-GR RES SON PWD DIR125594 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit125125753935103110311148160516701670169617341845186118611909192719301930193519361936 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1681.5042.0Water Based2041.4025.0Water Based4501.4221.0Water Based18881.4026.0Water Based20851.2020.0Water Based