16/3-4
Export: PDF
-
General information
-
Wellbore history
GeneralWell 16/3-4 was drilled to prove the extension of the Avaldsnes Discovery to the north-east of the structural crest of the Avaldsnes structure. In this area, a continuation of the Upper Jurassic, Intra-Draupne Formation sandstone found in the discovery well 16/2-6 was expected to rest on granitic basement.Operations and resultsWildcat well 16/3-4 was spudded with the semi-submersible installation Bredford Dolphin on 16 May 2011 and drilled to TD at 2020 m in granitic basement. A 9 7/8" pilot hole was drilled down to planned setting depth for 20" casing at 760. No shallow gas or boulders were seen. No significant problem was encountered during drilling of the pilot or the main well. The well was drilled with seawater and hi-vis sweeps down to 760 m and with Performadril mud from 760 m to TD.BCU, top Draupne Formation was encountered at 1914 m, and a 13.8 m thick Intra-Draupne Formation sandstone, Tithonian age, was penetrated at 1926 m. The Intra-Draupne sandstone was oil-filled down to weathered basement at 1940 m. No oil-water contact was established, however, pressure communication between 16/3-4 and the 16/2-6 T2 Avaldsnes discovery well was proved. There were no shows above or below the Intra Draupne Formation sandstone reservoir.Three cores were cut from 1913 to 1961 m, covering the Draupne Formation and 21 m of the underlying Basement. Good recovery was obtained in the first and last core (100 and 94% recovery respectively), while the recovery in core number 2 was 43%. Extensive wire line logging was performed including pressures (XPT/MDT) and fluid sampling. MDT fluid samples were taken at 1929.0 m (oil), 1939.6 m (oil), and 1943 m (water).After completing the data acquisition program and testing, the well was plugged back to the 20" casing shoe and sidetracked as well 16/3-4 A. The 16/3-4 well bore was permanently abandoned on 28 June as an oil appraisal well.TestingThe Draupne Formation sandstone was production tested (DST) from the interval 1923.5 to 1936.8 m. The test produced in the main flow 18200 Sm3 gas and 885 Sm3 oil /day through a 52/64" choke. The GOR was 20 Sm3/Sm3 at separator conditions of 46 deg C and 13.6 bar. The oil density and gas gravity at ambient conditions on-rig were 0.889 g/cm3 and 0.806 (air = 1), respectively. The maximum temperature measured at 1894.8 m was 83.5 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]770.002020.05 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11913.01940.2[m ]21940.21946.6[m ]31955.11960.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]39.1Cores 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 availableDST1939.601928.98OIL20.06.2011 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1428008779349401007132813541354138513961465148514851504157716941706174117831783186118861914191419261940 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]txt0.00txt0.00txt0.00txt0.07txt0.02txt0.19 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01923193620.6Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.083Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0885182000.88320 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR XPT GR18032015FMI MSIP GR14292016MDT GR19291943MSCT GR18091950MSCT GR19402011MWD - DIR GR RES PWD136757MWD - DIR GR RES PWD SON DEN NEU7372016PEX HRLA HNGS17952011USIT CBL16821946VSI GR1162010 -
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 typeCONDUCTOR30207.036211.00.00LOTSURF.COND.20752.026760.01.95LOTPILOT HOLE760.09 7/8760.00.00LOTINTERM.9 5/81795.012 1/41803.01.73LOTOPEN HOLE2020.08 1/22020.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4501.05Spud Mud7631.3025.0Permormadrill17051.3031.0Permormadrill19191.2133.0Permormadrill19611.2029.0Permormadrill20201.20NaCl Brine20201.2131.0Permormadril20201.2031.0Permormadrill -
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]pdf0.19