34/10-13
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General information
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Wellbore history
GeneralWell 34/10-13 was drilled on a horst block in the eastern part of the Gullfaks Fault Block. The primary objective of the well was to test the sandstone of Early Jurassic age (Statfjord formation). The Secondary objective was Carnian sandstone.Operations and resultsAppraisal well 34/10-13 was spudded with the semi-submersible installation Deepsea Saga on 24 August 1981 and drilled to TD at 3392 m, 76 m into the Carnian sandstone. At 1725 m, the well started to flow. The influx was circulated out with 1.69 s.g. mud. A total of 21.5 days were lost due to a strike after the drilling of the 6" section had been initiated. The well was drilled with spud mud down to 300 m, with seawater gel from 300 m to 893 m, and with gel/lignosulphonate mud from 893 m to TD. The RFT tool stuck at 2882 m during sampling. The tool was left in the hole and the well was plugged back and tested.First oil shows, typically cut and/or fluorescence on claystone and limestone cuttings, was recorded at 1350 m in the Hordaland Group. The shows were described more or less continuous down to top Statfjord reservoir at 1924 m. When drilling mudstones, limestone and marl in the Lista Formation from 1656 to 1701 m there was oil in the mud. Oil was found from top Statfjord Group at 1924 m and down to at least 2114 m in the Hegre Group where oil was tested on DST. No oil/water contact could be established in the Statfjord sandstone and pressure measurements in the Hegre Group were inconclusive. Shows were recorded on sandstones down to 2450 m. From petrophysical analyses the Statfjord Group had 70 m net pay with 27% average porosity and 24% average water saturation. The Hegre Group reservoir had 16.5 m net pay with average 27.8% porosity and 56% average water saturation. The Carnian sand was encountered at 3316 m. It was waterbearing without shows.Sixteen cores were cut in the well. Fifteen cores were cut in succession from 1931 m to 2087 m in the Amundsen Formation and Statfjord Group and recovered a total of 150.8 m core (87% total recovery). The last core was cut from 3373.5 m to 3391.5 m in the Carnian sandstone with 92% recovery. RFT fluid samples were taken at 1936.5 m (oil and gas), 1940 m (oil and gas) and 2111 m (oil and gas).The well was permanently abandoned on 5 January 1982 as an oil appraisal well on the Gullfaks Field.TestingTwo drill stem tests were performed.DST 1 tested the interval 2107 m to 2114 m in the Hegre Group. The test produced 440 Sm3 oil/day through a 32/64” choke. The GOR was 82.1 Sm3/Sm3 and the oil gravity was 31 °API. The temperature measured at gauge depth was 84 °C.DST2 tested the interval 2003 to 2009 m in the Statfjord Group. The test produced 835 Sm3 oil/day through a 32/64” choke. The GOR was 92.5 Sm3/Sm3 and the oil gravity was 40.1 °API. Solution gas had a gravity of 0.82 (air = 1). The temperature measured at gauge depth was 79.8 °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]300.003378.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11931.11931.3[m ]21931.31941.8[m ]41944.01959.8[m ]51961.01961.9[m ]61963.01973.7[m ]71974.01987.3[m ]81988.01997.2[m ]92003.02011.2[m ]102011.52017.5[m ]112018.52034.1[m ]122035.02044.7[m ]132047.22062.9[m ]142065.52075.4[m ]152077.02085.0[m ]163373.53390.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]150.0Cores 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 availableDSTTEST22003.002009.0023.12.1981 - 21:15YES -
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 typeCONDUCTOR30299.036300.00.00LOTSURF.COND.20869.026893.01.47LOTINTERM.13 3/81536.017 1/21542.01.80LOTINTERM.9 5/81720.012 1/41725.01.95LOTLINER72680.08 1/22700.01.96LOTOPEN HOLE3391.563392.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02107211412.72.02003200912.7Drill 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]1.0467380000.8760.686802.0860820000.8250.64595 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR6942682CYBERDIP17173394DIR17203394DLL MSFL GR17172160FDC CNL GR CAL2993394GEODIP19202055HDT17172687ISF SON GR SP MSFL2993393LSS GR18982155TDT GR19202371VDL19142100WAVEFORM19142100 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit23994295615391539159617071905190519242052 -
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]pdf1.91pdf24.61pdf1.97pdf4.85pdf12.21pdf0.11pdf0.35pdf5.19pdf10.91 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3001.0670.0waterbased8751.1148.0waterbased13801.2549.0waterbased16301.6050.0waterbased19001.8556.0waterbased24251.8653.0waterbased33921.6555.0waterbased -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1110.0[m]DCGEOCH1140.0[m]DCGEOCH1170.0[m]DCGEOCH1200.0[m]DCGEOCH1230.0[m]DCGEOCH1260.0[m]DCGEOCH1290.0[m]DCGEOCH1320.0[m]DCGEOCH1350.0[m]DCGEOCH1380.0[m]DCGEOCH1410.0[m]DCGEOCH1430.0[m]DCGEOCH1460.0[m]DCGEOCH1490.0[m]DCGEOCH1518.0[m]DCGEOCH1545.0[m]DCGEOCH1572.0[m]DCGEOCH1599.0[m]DCGEOCH1626.0[m]DCGEOCH1653.0[m]DCGEOCH1680.0[m]DCGEOCH1707.0[m]DCGEOCH1725.0[m]DCGEOCH1743.0[m]DCGEOCH