2/1-6
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Generell informasjon
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Brønnhistorie
GeneralWell 2/1-6 is located on the northern side of the Gyda structure on the Cod Terrace in the North Sea. The main target was the Late Jurassic Sandstone, informally called the Gyda sandstone member. The well was located such that it should prove the oil water contact of the 2/1-3 oil discovery, and by this establish whether 2/1-3, 2/1-4 and 1/3-3 all have encountered the same oil accumulation on the two sides of the saddle point. It should also test further the extent and the quality of this Upper Jurassic reservoir.Operations and resultsAppraisal well 2/1-6 was spudded with the semi-submersible installation Dyvi Alpha on 30 April 1984 and drilled to TD at 4583 m (4588 m loggers depth), one metre into Late Triassic sediments of the Skagerrak Formation. The well was drilled with seawater and pre-hydrated bentonite spud mud down to 635 m, with KCl/polymer mud from 635 m to 3424 m, with lignosulfonate mud from 3424 m to 4124 m, and with high temperature polymer mud from 4124 m to TD.The Gyda sandstone member was penetrated at 4173 m logger's depth. The reservoir is 205 metres thick, generally very fine to fine grained sandstone, but with a 28 metre thick siltstone incorporated in the uppermost part. Reservoir properties were very variable. Reasonable reservoir properties were found near the top of the reservoir. They were poor in an upper siltstone zone, in an intermediate 77 metre thick quartz overgrowth zone and at the base of the 2/1-3 sand where it shaled out into the Farsund Formation. Shows were recorded from 4174 to 4178 m in a sandstone that had very low permeability, and could not be tested. Minor patchily developed shows were observed from 4178 down to 4203 m, all within the fairly tight siltstone. No OWC was seen in the well. However, a possible OWC has been established at 4185 m (4160 m MSL), on the basis of a re-interpretation of RFT data from the wells 2/1-3, 4, 6 and 1/3-3 combined with pressure readings in the water zone of 2/1-6.Eight cores were cut between 4127 and 4165.35 m. Four cores were cut between 4303 and 4391.5 m. Recovery was 100% for all cores. For all cores the core depth is 4 m less than logger's depth. The RFT tool was run for pressure and fluid samples. A fluid sample was taken at 4208 m. Rig site resistivity measurements and laboratory water analysis confirmed the samples to be mud filtrate. Sampling was attempted in the interval 4173-4175 m. The sand interval was tight and neither pressure measurements nor sample were obtained.The well was permanently abandoned on 12 August 1984 as a dry appraisal well.TestingTwo drill stem tests/water injection tests were performed in the Gyda member sandstone. Both tests confirmed the reservoir to be water bearing.DST1 perforated 4328.75 - 4340.75 m and produced 288 B/D of water with 1.17 specific gravity in the main flow period, through a 64/64" choke. In the following injection period the final injection rate was 240 B/D of treated sea water and the final surface injection pressure was 7000 psig.DST2 perforated 4210 - 4241 m and produced 3379 B/D of water with 1.17 specific gravity in the main flow through a 28/64" choke. In the following injection period the final injection rate, before acidization, was 2880 B/D of treated sea water and the final surface injection pressure was 5245psig. After acidization the final injection rate was 7544 B/D of treated sea water and the final surface injection pressure was 4955 psig.A number of temperature sensors were employed in the tests and maximum temperatures from 146 to 162 deg C were recorded. Among these maximum temperatures of 319 deg F (159.4 deg C) and 318 (158.9 deg C) in DST1 and DST2 respectively seem to be the more representative and in agreement with corrected wire line temperatures. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]170.004581.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet14127.04153.3[m ]24153.74181.3[m ]34181.44208.6[m ]44208.54235.4[m ]54235.44245.6[m ]64245.64254.7[m ]74254.64263.2[m ]84263.34265.4[m ]94303.04313.0[m ]104313.04336.8[m ]114336.84364.3[m ]124364.34391.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]226.4Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie4100.0[m]DCHRS4110.0[m]DCHRS4124.0[m]CAPT4127.0[m]CHRS4132.0[m]CHRS4133.0[m]CAPT4139.0[m]CAPT4143.6[m]CHRS4145.0[m]CAPT4148.0[m]CHRS4151.0[m]CAPT4152.9[m]CHRS4153.0[m]CAPT4156.5[m]CHRS4157.0[m]CAPT4163.0[m]CAPT4163.6[m]CHRS4168.7[m]CAPT4168.9[m]CHRS4169.7[m]CAPT4170.6[m]CAPT4172.7[m]CAPT4173.7[m]CAPT4174.7[m]CAPT4175.7[m]CAPT4176.7[m]CAPT4176.9[m]CHRS4177.7[m]CAPT4178.7[m]CAPT4181.0[m]CHRS4181.4[m]CAPT4182.5[m]CAPT4185.3[m]CHRS4185.4[m]CAPT4186.4[m]CAPT4189.4[m]CAPT4191.5[m]CAPT4194.4[m]CAPT4196.4[m]CAPT4197.3[m]CHRS4197.4[m]CAPT4200.3[m]CAPT4205.7[m]CHRS4208.2[m]CAPT4210.1[m]CAPT4211.4[m]CHRS4218.0[m]CHRS4220.1[m]CAPT4222.5[m]CHRS4226.1[m]CAPT4232.1[m]CAPT4236.8[m]CHRS4237.0[m]CAPT4239.3[m]CAPT4244.0[m]CAPT4246.0[m]CAPT4246.0[m]CHRS4246.9[m]CAPT4256.1[m]CAPT4260.8[m]CAPT4261.2[m]CAPT4262.6[m]CHRS4304.5[m]CAPT4305.1[m]CAPT4307.5[m]CAPT4309.0[m]CAPT4321.5[m]CAPT4329.2[m]CHRS4333.8[m]CHRS4334.2[m]CAPT4336.5[m]CAPT4350.1[m]CAPT4350.5[m]CAPT4351.8[m]CAPT4355.8[m]CAPT4360.8[m]CAPT4362.1[m]CAPT4362.5[m]CHRS4363.8[m]CAPT4367.0[m]CAPT4368.2[m]CAPT4369.7[m]CAPT4370.3[m]CAPT4372.0[m]CHRS4372.3[m]CAPT4375.2[m]CAPT4377.2[m]CAPT4379.2[m]CAPT4381.3[m]CAPT4383.2[m]CAPT4385.2[m]CAPT4387.2[m]CAPT4389.2[m]CAPT4391.0[m]CHRS4391.2[m]CAPT4394.0[m]CHRS4400.0[m]CHRS4412.0[m]CHRS4445.0[m]CHRS4487.0[m]CHRS4526.0[m]CHRS4551.0[m]CHRS4566.0[m]CHRS4569.0[m]CHRS -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet911793294729472970298730333128317331963215321533123660378838063825382538533897410441044165442645604560456645874587 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.80 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.24pdf0.39 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf17.51 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.04329434025.42.04241421011.1Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.016.0002.012.500Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.02.0 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR5002000DIPMETER41144563DLL MSFL GR SP CALI41134583ISF BHC MAFL GR CALI SP20063913ISF BHC MAFL GR CALI SP36004123ISF GR SLS MSFL CALI SP6262001ISF LSS GR90635ISF LSS MSFL GR CALI SP41134586LDL CNL NGL41134587NGT RATIO41134587VSP6504578 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30166.036167.00.00LOTSURF.COND.20626.026635.01.56LOTINTERM.13 3/82006.017 1/22016.01.90LOTINTERM.9 5/84112.012 1/44121.02.12LOTLINER74579.08 1/24583.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1511.05WATER BASED10.05.19841661.04WATER BASED10.05.19841671.05WATER BASED13.05.19843201.084.05.0WATER BASED13.05.19844811.093.08.0WATER BASED13.05.19846351.155.026.0WATER BASED13.05.19846601.1419.028.0WATER BASED13.05.198411401.2014.010.0WATER BASED14.05.198414151.4222.012.0WATER BASED14.05.198417181.5022.012.0WATER BASED14.05.198418501.5024.06.2WATER BASED14.05.198420101.5423.05.3WATER BASED15.05.198422201.5519.06.2WATER BASED20.05.198424141.5517.07.2WATER BASED20.05.198425431.5518.05.8WATER BASED22.05.198427431.5521.07.2WATER BASED23.05.198429511.5623.05.8WATER BASED24.05.198430131.5622.015.4WATER BASED25.05.198431681.5727.013.4WATER BASED28.05.198432081.5821.09.1WATER BASED28.05.198432311.5820.011.0WATER BASED28.05.198433001.5719.09.1WATER BASED29.05.198433111.5822.05.8WATER BASED31.05.198433541.5823.08.6WATER BASED01.06.198434241.5825.08.2WATER BASED01.06.198434861.5830.06.7WATER BASED04.06.198435781.5832.08.2WATER BASED04.06.198436251.5832.07.2WATER BASED04.06.198436691.5828.06.7WATER BASED05.06.198437161.5830.07.7WATER BASED06.06.198437331.5833.07.7WATER BASED07.06.198437461.5833.07.7WATER BASED08.06.198437631.5831.07.2WATER BASED12.06.198437681.5830.07.2WATER BASED12.06.198437751.5828.06.2WATER BASED12.06.198438111.5834.08.0WATER BASED15.06.198438451.5828.06.0WATER BASED15.06.198438761.5729.07.0WATER BASED15.06.198438861.5926.06.2WATER BASED17.06.198439271.5830.07.7WATER BASED17.06.198439611.5829.09.6WATER BASED17.06.198440111.5828.09.6WATER BASED20.06.198440661.5825.013.4WATER BASED20.06.198441181.5821.05.3WATER BASED21.06.198441211.5821.05.3WATER BASED22.06.198441211.6926.013.4WATER BASED27.06.198441211.5821.05.3WATER BASED22.06.198441211.6926.013.4WATER BASED27.06.198441241.5615.09.6WATER BASED02.07.198441371.5619.09.6WATER BASED02.07.198441801.5621.011.0WATER BASED02.07.198442351.5623.011.5WATER BASED03.07.198442451.5621.011.0WATER BASED04.07.198442621.5618.010.6WATER BASED05.07.198442681.5622.010.6WATER BASED06.07.198442841.5619.011.5WATER BASED06.07.198443031.5619.012.0WATER BASED06.07.198443131.5620.015.5WATER BASED10.07.198443371.5619.015.4WATER BASED11.07.198443781.5720.014.9WATER BASED12.07.198443931.5616.06.2WATER BASED13.07.198444781.5521.012.0WATER BASED16.07.198445831.5518.012.0WATER BASED16.07.1984 -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet4127.00[m ]4164.00[m ]4181.00[m ]4197.00[m ]4334.00[m ]4354.00[m ]4363.00[m ]4374.00[m ]4391.00[m ] -
Trykkplott
Trykkplott Porertrykksdataene kommer fra logging i brønnen hvis ingen annen kilde er oppgitt. I noen brønner der trykk ikke er logget, er det brukt informasjon fra formasjonstester eller brønnspark. Trykkdataene er rapportert inn til Oljedirektoratet og videre prosessert og kvalitetssikret av IHS Markit.Trykkplott Dokument navnDokument formatDokumentstørrelse [MB]PDF0.22