30/6-13
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General information
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Wellbore history
GeneralWell 30/6-13 is a replacement for the 30/6-12 well, which was terminated in Pliocene sediments due to technical problems. The appraisal well 30/6-13 was drilled in a down flank position on the Alpha block east of the 30/6-1 Oseberg Discovery well, which tested gas in the Middle Jurassic Brent Group. The main objectives of the well were to confirm the reserves of hydrocarbons, to prove oil in the Etive Formation, to define and refine the geological model for the Alpha structure, to obtain core from the Brent Group, and to do a water injection test in the oil zone. The well was planned to be drilled 50 m into the Drake Formation to a total depth of 2764+/- 50 m.Operations and resultsWell 30/6-13 was spudded with the semi-submersible installation Treasure Seeker on a location ca 40 m to the south-east of well 30/6-12, on 11 March 1983. It was drilled to TD at 2775 m in the Early Jurassic Drake Formation. No major problems occurred during drilling. The well was drilled with spud mud down to 613 m and with a KCl/polymer mud from 613 m to TD. A pill of Imco-spot/Pipelax 140 bbl pill with 50 bbl diesel was spotted from 1410 m to 1525 m to free the 13 3/8" casing, which was stuck. The casing got free and was cemented with shoe at 1705 m.The well encountered hydrocarbons from 2571 to 2671 m in the Middle Jurassic Brent Group sandstones. No other hydrocarbon bearing reservoirs were encountered. Oil shows reported from limestone stringers in the interval 2120 - 2325 m in the Paleocene and Late Cretaceous were considered uninteresting.A total of nine cores were cut continuously from the Ness Formation to the Dunlin Group shales. One successful segregated RFT fluid sample was obtained at 2661.5 m (3 l oil and 0.57 Sm3 gas).The well was permanently abandoned on 14 May 1983 as an oil/gas appraisal well.TestingThree DST's were performed in the Brent Group.DST 1 was a combined production and injection test in the Etive Formation at 2640 - 2650 m. The test produced 450 Sm3 oil and 57766 Sm3 gas /day through a 28/64" choke. The GOR was 128 Sm3/Sm3 and the oil gravity was 34.3 deg API. The CO2 content was 0.9 %, and the H2S content was 0.3 ppm. The maximum injection rate was 1586 m3 in the water injection test. The bottom hole temperature was 103.9 deg C.DST 2 tested the interval 2596 - 2601 m in the Ness Formation. It produced 424 Sm3 oil and 43608 Sm3 gas /day through a 28/64" choke. The GOR was 103 Sm3/Sm3 and the oil gravity was 35.1 deg API. The CO2 content was 1 % and the H2S content was 0 ppm. The bottom hole temperature was 101.9 deg C.DST 3 tested the interval 2573.5 - 2579.5 m in the Ness Formation. It produced 428 Sm3 oil and 42192 Sm3 gas /day through a 28/64" choke. The GOR was 99 Sm3/Sm3 and the oil gravity was 35.8 deg API. The CO2 content was 1 % and the H2S content was 0 ppm. The bottom hole temperature was 101.7 deg C. -
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]230.002775.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12584.02599.6[m ]22599.92616.4[m ]32616.52619.7[m ]42623.02629.1[m ]62642.02645.7[m ]72646.02654.9[m ]82654.02669.6[m ]92669.02672.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]72.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2404.1[m]SWCRRI2414.0[m]SWCRRI2428.0[m]SWCRRI2435.0[m]SWCRRI2455.0[m]SWCRRI2474.9[m]SWCRRI2520.0[m]SWCRRI2545.1[m]SWCRRI2565.0[m]SWCRRI2570.0[m]SWCRRI2584.9[m]CRRI2594.2[m]CRRI2599.5[m]CRRI2616.7[m]CRRI2619.3[m]CRRI2627.8[m]CRRI2669.8[m]CRRI2672.0[m]CRRI -
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 availableDSTDST12640.002650.0027.04.1983 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13070580090410321080141015282036203620912164226022882288237523872387239424012401242425712571262826712671 -
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]pdf15.34 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02640265011.12.02596260111.13.02573258011.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0450580000.8520.6801282.0423440000.8520.6801023.0428420000.8470.68099 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST23052672CST24042649DLL MSFL GR CAL22602700EPT PDC25502766ISF LSS GR SP6001698ISF LSS GR SP17032778LDT CAL GR6001698LDT CNL CAL GR17032779NGT22502763RFT22902370RFT25732598RFT26002668RFT26132613RFT26612661RFT26872587SHDT19802773VELOCITY3152780 -
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 typeCONDUCTOR30217.036222.00.00LOTSURF.COND.20600.026613.01.46LOTINTERM.13 3/81705.017 1/21725.01.72LOTINTERM.9 5/82762.012 1/42775.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1851.05100.0waterbased6101.0740.0waterbased10851.1039.0waterbased13301.1135.0waterbased16401.1233.0waterbased22101.2536.0waterbased23001.2536.0waterbased25101.2540.0waterbased26001.2538.0waterbased27751.2538.0waterbased -
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]pdf0.23