2/7-19
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General information
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Wellbore history
>GeneralWell 2/7-19 is located ca 10 km west of the Embla and Eldfisk fields in the southern Norwegian North Sea. The objective was to test the Danian - Late cretaceous limestone, and sandstones of the Early Cretaceous and Jurassic on a low relief structure. Well 2/7-19 was the third attempt to drill this prospect. The first two attempts, 2/7-17 and 2/7-18, were junked because of mechanical problems.Operations and resultsWell 2/7-19 was spudded with the semi-submersible installation Borgny Dolphin on 2 September 1980 and drilled to TD at 4877 m in the Late Permian Zechstein Group. A total of 154 days on the location were used to drill and abandon the well. The well was drilled to a depth of 4785 m with 16.0 ppg mud. This was on 17 November. An estimated 12 m of Early Cretaceous sandstone had been penetrated and the drilling gas had increased after entering this zone, with some indications of hydrocarbons. The well was static with 16.0 ppg density mud, however the weight was raised to come out of the hole and commence coring. Upon raising the mud weight to 16.3 ppg a pack-off occurred which broke down a formation and circulation was lost. Circulation was re-established with 16.0 ppg mud. The mud weight was then raised in stages from 16.2 ppg to give an adequate trip margin to log. Logs were run, after which lost circulation problems again occurred. It took up to January 8 1981 before problems were cured and drilling could commence. The well was drilled with seawater and pre-hydrated bentonite down to 593 m, with seawater/bentonite/native solids from 593 m to 1600 m, and with seawater/Drispac/lignosulphonate from 1600 m to TD.No hydrocarbons were encountered in the Danian - Late Cretaceous limestone. Some fluorescence was observed on limestones in the Tor Formation and in the Hidra Formation. Gas-bearing sands of the Ula Formation were encountered. Oil shows were recorded in these sands, generally described as dull yellow fluorescence and slow yellow cut.One conventional core was cut from 3143.7 - 3162.0 m in the top of the Ekofisk Formation. One RFT fluid sample was recovered from 4772.2 m in an Ula Formation sandstone unit. The sample consisted of 50% gas-cut mud, where the gas gravity was 0.78 (air = 1). The RFT results indicated pressures too high to be safely tested with the rig equipment and BOP's on the rig at that time.The well was suspended on 19 June 1989 pending further evaluation and possible testing.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]586.004876.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom110314.010370.3[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]17.2Cores 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 typeLaboratory4547.0[m]DCOD4580.0[m]DCOD4583.0[m]DCHRS4593.0[m]DCOD4596.0[m]DCHRS4596.0[m]DCOD4608.0[m]DCHRS4617.0[m]DCOD4620.0[m]DCOD4623.0[m]DCHRS4626.0[m]DCOD4635.0[m]DCHRS4647.0[m]DCHRS4647.0[m]DCOD4666.0[m]DCOD4684.0[m]DCOD4705.0[m]DCOD4721.0[m]DCOD4736.0[m]DCOD4754.0[m]DCOD4760.0[m]DCHRS4766.0[m]DCHRS4766.0[m]DCOD4781.0[m]DCOD4785.0[m]DCHRS4800.0[m]DCOD4803.0[m]DCOD4821.0[m]DCOD4839.0[m]DCOD4852.0[m]DCOD4858.0[m]DCOD4867.0[m]DCOD4873.0[m]DCOD -
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 availableDST0.000.0030.10.2000 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit9815302987298730043027306931303130318834444055408142124212432844684586458645904693469348104840 -
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]pdf14.71pdf7.45pdf4.03 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL14484836CDM37814849CDM AP37844877DIL SONIC37814784FDC CNL28964877GR91586ISF BHC15863794ISF BHC MSFL42674877ISF SONIC GR5861595MPT ML MLL37844877RFT00VELOCITY5864877 -
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 typeCONDUCTOR30153.936154.50.00LOTSURF.COND.20585.526593.41.40LOTINTERM.13 3/81585.917 1/21600.21.87LOTINTERM.9 5/83780.412 1/43799.92.02LOTLINER74872.28 1/24876.80.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1342.1271.027.3OIL BASED22.01.19901342.0420.019.2WATER BASED22.01.19901492.0420.016.8WATER BASED22.01.19902912.0420.08.1WATER BASED22.01.199010061.1435.0WATER BASED02.02.198113562.0420.013.9WATER BASED22.01.199014431.6255.0WATER BASED02.02.198115442.0419.09.6WATER BASED22.01.199015822.0419.014.4WATER BASED22.01.199016001.1942.0WATER BASED02.02.198120651.6254.0WATER BASED02.02.198130012.0421.06.7WATER BASED22.01.199031201.7155.0WATER BASED02.02.198134371.7152.0WATER BASED02.02.198134632.0422.09.6WATER BASED22.01.199038001.7345.0WATER BASED02.02.198140651.9252.0WATER BASED02.02.198141631.9247.0WATER BASED02.02.198144591.9256.0WATER BASED02.02.198146041.9250.0WATER BASED02.02.198147851.9662.0WATER BASED02.02.198148622.0518.09.1WATER BASED22.01.199048632.0419.09.6WATER BASED23.01.199048632.0455.014.4OIL BASED25.01.199048632.0455.08.1OIL BASED26.01.199048632.0439.014.4OIL BASED29.01.199048632.0434.09.6OIL BASED29.01.199048632.0434.09.6OIL BASED30.01.199048632.0533.010.1OIL BASED31.01.199048632.0533.010.1OIL BASED01.02.199048632.0522.05.3WATER BASED24.01.199048632.0455.08.1OIL BASED29.01.199048632.0434.09.6OIL BASED29.01.199049852.0147.0WATER BASED02.02.1981 -
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