34/10-14
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General information
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Wellbore history
GeneralWell 34/10-14 was drilled on a horst block in the north-eastern part of the Gullfaks field. The objectives of the well were to prove the structural position of the middle- and early Jurassic sandstones and to establish the oil-water contact in the Brent Group in this part of the field.Operations and resultsAppraisal well 34/10-14 was spudded with the semi-submersible installation Ross Rig on 24 December 1981 and drilled to TD at 2647 m in the Triassic Hegre Group. Significant downtime (17% of total rig time) was caused by the combined effect of bad weather and the need to pull the BOP three times to detect leaks. The well was drilled with gel/lignosulphonate/seawater mud all through.Weak shows on limestone and claystone cuttings were recorded intermittently from 1506 m in the Hordaland down to top Shetland Group at 1729 m. Sandstones of the Ness Formation were oil-bearing from 1908 m to the oil-water contact, indicated by pressure measurements and logs to be at 1972 m. This corresponds to the OWC found in the wells 34/10-3, 5 and 8. Shows on cores continued down to 2002 m.Ten cores were recovered, nine in the interval from 1889 to 2047m KB and one core from 2210 to 2228 KB. RFT fluid sampling was performed at 1917.5 m and 1961.5 m but the fluids recovered were not representative for the reservoir fluid.The well was permanently abandoned on 19 March 1982 as an oil appraisal well.TestingOne drill stem test was performed in the interval 1933.5 m to 1937.5 m in the Ness Formation. The test produced 713 Sm3 oil/day through a 34/64” choke. The GOR was 67 Sm3/Sm3, separator oil gravity was 29.4 °API, and gas gravity was 0.67 (air = 1). The maximum temperature at gauge depth was 75 °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]310.002643.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11889.01895.9[m ]21907.81921.9[m ]31925.01932.7[m ]41939.51949.4[m ]51957.01972.5[m ]61972.51990.4[m ]71991.02009.4[m ]82010.02028.0[m ]92028.02047.0[m ]102210.02224.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]141.9Cores 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 typeLaboratory1465.0[m]DCGEOCH1490.0[m]DCGEOCH1505.0[m]DCGEOCH1545.0[m]DCGEOCH1615.0[m]DCGEOCH1645.0[m]DCGEOCH1655.0[m]DCGEOCH1705.0[m]DCCGG1725.0[m]DCGEOCH2156.0[m]SWCRRI2165.0[m]SWCRRI2190.0[m]SWCRRI2202.0[m]SWCRRI2209.0[m]SWCRRI2229.4[m]SWCRRI2241.0[m]SWCRRI2255.0[m]SWCRRI2269.0[m]SWCRRI -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit252926953155415541621172919081908197620032069208020802159220323722596 -
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]pdf2.28pdf21.54pdf1.70pdf0.19pdf0.94pdf0.61pdf0.23pdf1.91 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01934193712.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0850810000.8200.65095 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]C H CNL GR18962000CBL VDL GR7802292CYBERDIP17962645DIR17962649DLL MSFL GR17962116FDC CNL GR7852644HDT17962645ISF SON MAFL GR2422643TDT GR19002050VDL LSS19002150 -
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 typeCONDUCTOR30313.036314.00.00LOTSURF.COND.20785.026800.01.80LOTINTERM.13 3/81554.017 1/21568.01.85LOTINTERM.9 5/81799.012 1/41810.01.93LOTLINER72297.08 1/22300.02.38LOTOPEN HOLE2647.062647.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3651.07waterbased8301.15waterbased13401.30waterbased15701.50waterbased18101.72waterbased19301.80waterbased23201.64waterbased -
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