30/10-6
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General information
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Wellbore history
GeneralThe exploration well 30/10-6 is situated in the central part of block 30/10, approximately 10km north of the Odin Field. The structure is part of the Jurassic fault block system forming at NE-SW trending complex from the Frigg area to the Southeastern part of block 30/7. The objective of well 30/10-6 was to explore the hydrocarbon potential of the Middle Jurassic Brent Group. Top Brent was prognosed at 5120 m.Operations and resultsThe well 30/10-6 was spudded 13 January 1992 by the semi submersible rig West Alpha and was completed the 11 November 1992 at a TD of 5250 in the Middle Jurassic Ness Formation of the Brent Group. Due to too much inclination of the well, it had to be spudded three times. The verticality was critical due to possible severe casing wear in a deep well. After the third spud the drill string got stuck at 620 m in the 26" section. Fishing was unsuccessful and as verticality was important the well was respudded again. If plugging is not considered, the total duration of the well was 206 days for the drilling part. This includes 22 days on the three first spuds and 184 days on the final well. Compared to the planned 114 days (114 = 125 -11 for P&A) this yields a total delay of 92 days. The well was drilled with Bentonite mud down to 1420 m, with gypsum mud from 1420 m to 4368 m, and with polymer mud from 4368 m to TD.A seismic reflector depth converted to 4850 m (+ /- 200m), was interpreted as a "Callovian Unconformity", possibly with sand stringers. This seismic reflector proved to be top Tarbert Formation at 4666 m. The Tarbert Formation could be divided into two an Upper Sand (4666 m to 4815 m) and a Lower Sand (4884.5 m to 5207 m) separated by a 70 m thick shale unit. The top part of the Upper Sand contained gas. It was not possible to establish a free water level or a gas/water contact. The reservoir characteristics were poor and commercial production was not found to be possible.The well was permanently plugged and abandoned as a gas discovery.TestingFour tests were performed in the Tarbert Formation, two in the Lower Sand and two in the Upper Sand.DST 1C in the lower part of the Lower Sand Unit (5008 m to 5045 m) produced no hydrocarbons at surface. The formation was found to be tight and water bearing.DST 2B in two zones in the upper part of the Lower Sand Unit (4899 m to 4912 m + 4930 m to 4965.2 m) produced dry gas in slugs. Gas gravity was 0.58. The zones were found to be tight with trapped gas and water, with an uncertain gas/water contact. The produced dry gas could come from DST 4 permeable zone by channelling through liner annulus.DST 3 in the lower part of the Upper Sand Unit (4768 m to 4803 m) produced dry gas in slugs. Gas gravity was 0.62. The formation was found to be tight with trapped gas and water, with an uncertain gas/water contact. Produced dry gas could come from DST 4 permeable zone by channelling through liner annulus.DST 4 in the upper part of the Upper Sand Unit (4666 m to 4714 m) produced dry gas at a rate of 90000 Sm3/day and no water using an 8/64" choke. The gas was completely dry with no liquid at surface. Gas gravity was 0.62 and had chemical and isotopic composition similar to the gas recovered in DST 2B and DST 3. -
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]230.005250.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14663.04671.8[m ]24672.04691.0[m ]34691.04693.4[m ]44697.04716.0[m ]54946.04964.0[m ]64964.04980.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]83.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30205.036206.00.00LOTINTERM.201410.0261411.01.83LOTINTERM.13 3/83064.017 1/23065.01.88LOTINTERM.9 5/84353.012 1/44354.02.20LOTLINER75248.08 1/25248.02.29LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0500850450.01.1500850453.02.0489949650.02.1489949650.02.2489952500.03.0476848030.04.0466647143.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.12.02.12.23.04.0154Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01.12.02.12.20.5803.04.0900000.620 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGT DLL BHC GR AMS47404948BGT DSI GR AMS46855077BHC MSF DIL GR AMS49975253CBL VDL GR15003058CBL VDL GR30334352CBL VDL GR40004989CST GR21492586CST GR21492586CST GR30894271CST GR43825069CST GR50805238CST GR50805238DIL BHC LDL GR AMS30624358DIL MSFL GR AMS49105077DITE BHC GR AMS43585051DLL BGT GR AMS46304909DLL GR AMS50505253DLL MSFL BHC GR AMS43584844DLL MSFL GR AMS46505042FMI MS DIP43585077FMS GR AMS50745253LDL CNL BGT AMS46504944LDL CNL NGL AMS35753725LDL CNL NGL AMS43584840LDL CNL NGL AMS46505052LDL CNL NGL BHC49155077MFCT00MFCT GR1104830MWD2055050NGL CNL LDL AMS50005253PSV10803000PSV27004350QSST DIL BHC LDL GR AMS14073065RFT GR AMS04849RFT GR AMS46664810RFT GR AMS48844903RFT GR AMS49144939RFT GR AMS49154939RFT GR AMS49695067SHDT GR AMS14073063SHDT GR AMS30624286SHDT GR CAL43574830SHDT GR CAL CCL CBL1094285 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1094011158216621662220225623182358242725022589258928323608378038033931393140264095434443444368466646665089 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.73 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.74 -
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]pdf38.46 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1001.8923.0WATER BASED1051.89WATER BASED1301.05WATER BASED1331.05WATER BASED1501.7020.0WATER BASED2051.051.0WATER BASED3001.50WATER BASED3051.0625.0WATER BASED3241.05WATER BASED3351.0915.0WATER BASED5001.0510.0WATER BASED6431.05WATER BASED8501.0825.0WATER BASED8701.0916.0WATER BASED11701.1027.0WATER BASED13001.5015.0WATER BASED13501.1116.0WATER BASED13701.1217.0WATER BASED13771.0915.0WATER BASED13851.1115.0WATER BASED14201.126.0WATER BASED15001.8930.0WATER BASED15441.1524.0WATER BASED17781.2522.0WATER BASED18461.3027.0WATER BASED19861.3526.0WATER BASED21071.3644.0WATER BASED21791.3625.0WATER BASED21871.3726.0WATER BASED21931.3735.0WATER BASED22461.3732.0WATER BASED22731.3739.0WATER BASED23641.3739.0WATER BASED24711.3737.0WATER BASED25251.3650.0WATER BASED25251.3637.0WATER BASED25341.8923.0WATER BASED25501.8925.0WATER BASED25631.3637.0WATER BASED25841.3629.0WATER BASED26421.3626.0WATER BASED26661.3626.0WATER BASED26921.3627.0WATER BASED27501.3624.0WATER BASED28001.89WATER BASED28601.3625.0WATER BASED28911.5919.0WATER BASED29471.3625.0WATER BASED29701.3623.0WATER BASED30551.3624.0WATER BASED30761.3623.0WATER BASED30831.3823.0WATER BASED32001.3723.0WATER BASED32201.3723.0WATER BASED32211.3723.0WATER BASED32301.3724.0WATER BASED32881.3722.0WATER BASED36361.3721.0WATER BASED36441.4025.0WATER BASED36921.4320.0WATER BASED37551.4323.0WATER BASED37951.4724.0WATER BASED38161.4825.0WATER BASED38161.4826.0WATER BASED40061.7224.0WATER BASED40601.7225.0WATER BASED41241.7426.0WATER BASED41502.1436.0WATER BASED41671.7525.0WATER BASED41832.1437.0WATER BASED42101.7526.0WATER BASED42601.7522.0WATER BASED42921.7523.0WATER BASED43211.7820.0WATER BASED43361.8020.0WATER BASED43531.8522.0WATER BASED43681.8521.0WATER BASED43711.8923.0WATER BASED43731.9623.0WATER BASED43881.9523.0WATER BASED44331.9628.0WATER BASED44401.9525.0WATER BASED44581.9525.0WATER BASED44931.9525.0WATER BASED45001.9526.0WATER BASED45241.9525.0WATER BASED45352.1436.0WATER BASED45532.1436.0WATER BASED45741.9526.0WATER BASED46191.9526.0WATER BASED46632.0830.0WATER BASED46722.1027.0WATER BASED47242.1433.0WATER BASED47252.140.5WATER BASED47302.1044.0WATER BASED47941.9524.0WATER BASED48252.1027.0WATER BASED48452.1030.0WATER BASED48602.1038.0WATER BASED48652.1042.0WATER BASED49102.1038.0WATER BASED49462.1042.0WATER BASED49682.1030.0WATER BASED49702.1036.0WATER BASED49802.1048.0WATER BASED49852.1048.0WATER BASED49852.1046.0WATER BASED50482.1036.0WATER BASED50652.1053.0WATER BASED50752.1040.0WATER BASED50782.0432.0WATER BASED50972.0454.0WATER BASED51512.0448.0WATER BASED51772.0455.0WATER BASED52502.0448.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory4610.0[m]DCCGG4622.5[unknown]DCCGG4630.0[m]DCCGG4645.0[m]DCCGG4655.0[m]DCCGG4660.0[m]DCCGG4665.0[m]CCGG4689.0[m]CCGG4690.0[m]CCGG4693.3[m]CCGG4714.0[m]CCGG4715.2[m]CCGG4716.0[m]CCGG4717.5[m]DCCGG4827.5[m]DCCGG4835.0[m]DCCGG4860.0[m]DCCGG4870.0[m]DCCGG4977.5[m]CCGG4978.0[m]CCGG