2/7-8
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Generell informasjon
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Brønnhistorie
GeneralWell 2/7-8 is located In the Feda Graben of the southern North Sea, some 3 km west of the Eldfisk Field. It was drilled on the East Eldfisk Structure, and the main objective was to test the Danian Limestone. Secondary objective was to test the Late Cretaceous Chalk, which could by hydrocarbon bearing if porosity is present.Operations and resultsWildcat well 2/7-8 was spudded with the jack-up installation Zapata Explorer on 8 June 1973 and drilled to TD at 3318 m in the Late Cretaceous Hod Formation. The well was drilled with seawater and hi-vis slugs down to 1220 m, and with a lignosulphonate mud (UNI-CAL / Caustic) from 1220 m to TD. According to the mud program the section below 1220 m was drilled with 4% diesel in the mud.The Danian Limestone, which was expected to be 100 m thick with 38 m of net pay, was found to be much thinner than the other wells on Eldfisk, and was only 9 m thick. It was also less fractured than other wells on Eldfisk, but still yielded commercial quantities of oil and gas, after acidization, over the total interval on the third of three drill stem tests. This test included the top 23 m of the Late Cretaceous (Maastrichtian). The remaining tests below this interval, also in the Maastrichtian, did not produce oil or gas in commercial amounts. The truncated Danian, the lack of fracturing and secondarily porosity, and the fact that the produced oil was heavier than the oils on the main Eldfisk structure to the west, suggested that East Eldfisk structure is not in communication with the main Eldfisk structure.No cores were cut and no wire line fluid samples were taken.The well was permanently abandoned on 12 August 1973 as an oil discovery.TestingFour drill stem tests were performed.DST 1 and 2 tested the interval 3039 - 3051 m in the Maastrichtian Tor Formation. DST 1 gave no production. DST 2, after acidization, produced 1 litre fluid (95% water and 5% oil) pr hour.DST 3 tested the interval 3014 - 3033 m in the Tor Formation. It produced 13.5 Sm3 oil and 2407 Sm3 gas/day. The corresponding GOR is 178 Sm3/Sm3, and the measured oil gravity was 14 deg API.DST 4 tested the interval 2969 - 3001 m in the Danian Ekofisk Formation and the upper Tor Formation. It produced 539 Sm3 oil and 53802 SM3 gas/day. The corresponding GOR is 100 Sm3/Sm3, and the measured oil gravity was 33 deg API. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?NOBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1237.493318.36 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1041850287428742886292029632969296929783028 -
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Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0303930510.02.0303930510.03.0301430330.04.0296930010.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.02.03.040.00027.0004.040.00037.000Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.02.03.01324060.9704.0539537890.860 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]4ARM DIPLOG870010886BHC AC GR2303995BHC AC GR40048044BHC AC GR803310877CBL230585CBL3003940CBL54007700CBL772010814CNL930010886FDC930010886IEL160010887ML930010886VELOCITY23010887 -
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 formasjonstestCONDUCTOR30154.036155.00.00LOTSURF.COND.20488.026497.00.00LOTINTERM.13 3/81220.017 1/21229.00.00LOTINTERM.9 5/82449.012 1/42457.00.00LOTLINER73311.08 1/23318.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1741.10waterbased4871.0755.0waterbased5481.3750.0waterbased7621.4355.0waterbased10661.4955.0waterbased12191.3755.0waterbased29001.7251.0waterbased33181.7151.0waterbased