30/6-4
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General information
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Wellbore history
GeneralWell 30/6-4 was drilled on the Alpha structure on the Gullfaks fault block in the North Sea. The primary objective was to test hydrocarbon accumulations in Middle Jurassic sandstones and to define the hydrocarbon contacts. Gas was the expected hydrocarbon phase.Operations and resultsWell 30/6-4 was spudded with the semi-submersible installation Deepsea Saga on 17 February 1981 and drilled to TD at 2942 m in the Early Jurassic Amundsen Formation. Total depth for the well was reached 10 days before prognosed although 5 days were spent on rig repair when the heave compensator fell down. Apart from this accident no major problems were encountered in the drilling phase. The well was drilled in favourable weather condition. The well was drilled with spud mud down to 962 m, with KCl/polymer mud from 962 m to 1862 m, and with gel/lignosulphonate mud from 1862 m to TD.Sporadic fluorescence was recorded on cuttings from limestone/siltstone stringers in the Paleocene and Cretaceous. Top Cretaceous had good shows on cuttings and sidewall core in the interval 2300 - 2305 m, and two valid RFT pressure points indicated a gas gradient over the interval.Top Brent Group, Ness Formation was encountered at 2597 m with an oil-filled Etive Formation from 2630 m to 2686 m. No oil/water contact was found, but combined pressure data from the well and three previous wells on the structure indicated a gas/oil contact at 2528 m.Four cores were cut from 2638 m in the Etive Formation to 2692.5 m, a few meters into the underlying Drake Formation. One RFT oil sample of good quality was taken at 2633 m.The well was permanently abandoned on 11 May 1981 as an oil appraisal.TestingTwo drill stem tests were performed in the Etive Formation.DST 1 tested the interval 2655 m to 2665 m. It produced 712 Sm3 oil and 84400 Sm3 gas /day through a 48/64" choke. The GOR was 118 Sm3/Sm3, the oil density was 0.855 g/cm3 and the gas gravity was 0.678 (air = 1).DST 2 tested the interval 2630.5 m to 2638 m. It produced 715 Sm3 oil and 81550 Sm3 gas /day through a 48/64" choke. The GOR was 113 Sm3/Sm3, the oil density was 850 g/cm3 and the gas gravity was 0.675. Maximum bottom hole flowing temperature was 101.7 deg C. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]190.002939.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12638.02643.6[m ]22654.02672.6[m ]32672.02682.4[m ]42685.52692.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]41.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDST0.000.00YESDSTDST 12655.002665.0025.04.1981 - 20:15YESDSTDST 22630.502638.0004.05.1981 - 20:30YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit135655857201620162130221822972415241524302597259726302686268628552893 -
Geochemical information
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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]pdf24.32 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02655266519.52.02630263824.8Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0753846000.8551122.0888892000.850100 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL CCL GR5981850CBL VDL CCL GR16002752CBL VDL CCL GR21402309CBL VDL CCL GR25002674DLL MSFL GR18602765FDC CNL GR CAL1922944HDT18602766HDT27552940ISF SON GR SP1922944 -
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 typeCONDUCTOR30192.036192.00.00LOTSURF.COND.20962.026975.01.50LOTINTERM.13 3/81862.017 1/21867.51.86LOTINTERM.9 5/82756.012 1/42765.01.65LOTOPEN HOLE2942.08 1/22942.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3601.0945.0waterbased9251.0746.0waterbased12251.1352.0waterbased16751.3553.0waterbased21601.5573.0waterbased23801.5459.0waterbased -
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