7119/12-3
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General information
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Wellbore history
GeneralThe primary objective of wildcat 7119/12-3 was to test possible hydrocarbon accumulations in sandstones of Middle to Lower Jurassic age. Gas and condensate were discovered in the sandstone sequences. Planned TD was 3765 m.Operations and resultsExploration well 7119/12-3 was spudded with the semi-submersible installation Dyvi Delta on 20 may 1982 and drilled to TD at 3314 m in the Early Jurassic Nordmela Formation. A total of 121 days was spent on this well including testing and a 9.5 days seamen's strike. The time estimate was 106 days. No major problems occurred due to drilling. The well was drilled using spud mud down to 303 m, with gel/seawater from 303 m to 716 m, with gypsum/polymer from 716 m to 1618 m, and with gel/lignosulphonate from 1618 m to TD.Hydrocarbon accumulations were discovered in sandstone sequences between 3144 - 3285 m in the Stø Formation. From log evaluation the interval contained 118 m net sand. The gas/water contact at 3285 m is based on the log evaluation. Due to very tight and hard formation only two RFT pressure points were obtained out of 16 attempts (seal failures). Organic geochemical analyses found only poor source rock potential in the well. Shales in the Late Jurassic Hekkingen Formation from 3026 m to 3107 m had high TOC levels in the range 3% to 9%. However, with Hydrogen Indexes only in the range 30 - 40 mg HC/g TOC in non-caved, high-TOC samples, these shales are gas prone, and can not produce any significant quantities of liquid hydrocarbons. The well is immature down to ca 2300 m and reaches oil window maturity at ca 3000 m. Three cores were cut in the sandstones of the Middle to Early Jurassic Stø Formation. The two first were cut in the interval 3145 m to 3154.85 m with 100 % recovery. The third was cut from 3250 m to 3267 m with 97 % recovery. One RFT segregated sample was taken at 3187 m. The 2 3/4 -gallon chamber was bled off on the rig. It had an opening pressure of 38.9 bar and contained 0.226 m3 of gas and 9.5 1 of mud filtrate with a condensate film on the top of the filtrate. The 1-gallon chamber was drained onshore and had an opening pressure of 54 bar at 17°C. It contained 22.2 1 of gas and 3.525 1 mud filtrate.The well was permanently abandoned on 12 September 1983 as a gas/condensate discovery.TestingOne DST was performed. The interval from 3185 m to 3195 m in the Stø Formation was perforated and production tested. The test flowed 956 900 Sm3 /day of gas with 15.2 Sm3 /day of condensate through a 64/64" choke. The gas contained 12.4 % CO2. The permeability of the tested zone was estimated to 17.42 mD with an average porosity of 5.3 % and an average water saturation of 28.9 %. After the DST three runs with cased hole RFT was performed. The result from these was bad due to tight formation or sealing failures. -
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]310.003315.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13145.03148.3[m ]23148.33154.9[m ]33250.03266.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]26.4Cores 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 typeLaboratory310.0[m]DCRRI330.0[m]DCRRI350.0[m]DCRRI370.0[m]DCRRI390.0[m]DCRRI410.0[m]DCRRI430.0[m]DCRRI450.0[m]DCRRI470.0[m]DCRRI490.0[m]DCRRI510.0[m]DCRRI530.0[m]DCRRI550.0[m]DCRRI570.0[m]DCRRI590.0[m]DCRRI610.0[m]DCRRI630.0[m]DCRRI650.0[m]DCRRI670.0[m]DCRRI690.0[m]DCRRI710.0[m]DCRRI730.0[m]DCRRI750.0[m]SWCRRI770.0[m]DCRRI790.0[m]DCRRI810.0[m]DCRRI817.0[m]SWCRRI830.0[m]DCRRI850.0[m]DCRRI870.0[m]DCRRI890.0[m]SWCRRI915.0[m]SWCRRI930.0[m]DCRRI945.0[m]SWCRRI960.0[m]DCRRI975.0[m]DCRRI990.0[m]DCRRI1005.0[m]DCRRI1016.0[m]SWCRRI1030.0[m]DCRRI1045.0[m]DCRRI1060.0[m]DCRRI1070.0[m]DCRRI1086.0[m]SWCRRI1100.0[m]DCRRI1130.0[m]DCRRI1145.0[m]DCRRI1180.0[m]DCRRI1195.0[m]DCRRI1205.0[m]DCRRI1212.0[m]SWCRRI1225.0[m]DCRRI1240.0[m]DCRRI1255.0[m]DCRRI1270.0[m]DCRRI1285.0[m]DCRRI1295.0[m]DCRRI1309.0[m]SWCRRI1325.0[m]DCRRI1340.0[m]DCRRI1355.0[m]DCRRI1363.0[m]SWCRRI1380.0[m]DCRRI1395.0[m]DCRRI1410.0[m]DCRRI1425.0[m]DCRRI1441.0[m]SWCRRI1455.0[m]DCRRI1470.0[m]DCRRI1495.0[m]DCRRI1495.0[m]SWCRRI1510.0[m]DCRRI1525.0[m]DCRRI1540.0[m]DCRRI1555.0[m]DCRRI1575.0[m]SWCRRI1595.0[m]DCRRI1600.0[m]DCRRI1615.0[m]DCRRI1625.0[m]DCRRI1630.0[m]DCRRI1645.0[m]DCRRI1660.0[m]DCRRI1675.0[m]DCRRI1690.0[m]DCRRI1695.0[m]DCRRI1705.0[m]DCRRI1720.0[m]DCRRI1735.0[m]DCRRI1750.0[m]DCRRI1765.0[m]DCRRI1780.0[m]DCRRI1795.0[m]DCRRI1810.0[m]DCRRI1825.0[m]DCRRI1835.0[m]SWCRRI1840.0[m]DCRRI1855.0[m]DCRRI1870.0[m]DCRRI1885.0[m]DCRRI1895.0[m]DCRRI1900.0[m]DCRRI1915.0[m]DCRRI1930.0[m]DCRRI1945.0[m]DCRRI1960.0[m]DCRRI1975.0[m]DCRRI1990.0[m]DCRRI1995.0[m]DCRRI2005.0[m]DCRRI2020.0[m]DCRRI2035.0[m]DCRRI2050.0[m]DCRRI2065.0[m]DCRRI2080.0[m]DCRRI2095.0[m]DCRRI2110.0[m]DCRRI2125.0[m]DCRRI2140.0[m]DCRRI2155.0[m]DCRRI2170.0[m]DCRRI2185.0[m]DCRRI2195.0[m]DCRRI2200.0[m]DCRRI2208.0[m]SWCRRI2215.0[m]DCRRI2230.0[m]DCRRI2245.0[m]DCRRI2260.0[m]DCRRI2260.0[m]SWCRRI2275.0[m]DCRRI2290.0[m]DCRRI2293.5[m]SWCRRI2297.5[m]SWCRRI2305.0[m]DCRRI2320.0[m]DCRRI2335.0[m]DCRRI2348.0[m]SWCRRI2350.0[m]DCRRI2365.0[m]DCRRI2380.0[m]DCRRI2395.0[m]DCRRI2397.5[m]SWCRRI2400.0[m]SWCRRI2410.0[m]DCRRI2425.0[m]DCRRI2440.0[m]DCRRI2450.0[m]SWCRRI2450.0[m]DCRRI2455.0[m]DCRRI2470.0[m]DCRRI2480.0[m]DCRRI2489.0[m]SWCRRI2495.0[m]DCRRI2510.0[m]DCRRI2525.0[m]DCRRI2542.5[m]SWCRRI2550.0[m]DCRRI2555.0[m]DCRRI2570.0[m]DCRRI2591.0[m]SWCRRI2600.0[m]DCRRI2615.0[m]DCRRI2630.0[m]DCRRI2645.0[m]DCRRI2650.0[m]SWCRRI2650.0[m]DCRRI2660.0[m]DCRRI2687.0[m]SWCRRI2705.0[m]DCRRI2712.0[m]SWCRRI2735.0[m]DCRRI2750.0[m]DCRRI2755.0[m]SWCRRI2765.0[m]DCRRI2780.0[m]DCRRI2795.0[m]DCRRI2810.0[m]DCRRI2825.0[m]DCRRI2850.0[m]DCRRI2855.0[m]DCRRI2870.0[m]DCRRI2900.0[m]DCRRI2915.0[m]DCRRI2930.0[m]DCRRI2950.0[m]DCRRI2955.0[m]DCRRI2960.0[m]DCRRI2965.0[m]DCRRI2975.0[m]DCRRI2980.0[m]DCRRI3005.0[m]DCRRI3035.0[m]DCRRI3050.0[m]DCRRI3080.0[m]DCRRI3102.0[m]SWCRRI3110.0[m]DCRRI3123.0[m]SWCRRI3140.0[m]DCRRI3155.0[m]DCRRI3170.0[m]DCRRI3200.0[m]DCRRI3300.0[m]DCRRI3314.0[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 availableDSTTEST13185.003195.0003.09.1983 - 13:15YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit24044244212021202145614562715295330263107314431443299 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.52 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.69 -
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]pdf15.64pdf1.50 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03185319525.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0179570000.7970.722 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL4501603CBL VDL10003136CBL VDL28003234CST7001618CST16293118CST22932790CST28153135CST31653307DLL GR31363315DLL GR31363315HDT16033144ISF BHC GR SP CAL2401617ISF BHC MSFL GR SP CAL16033315LDL CNL GR302709LDL CNL GR31363315LDL GR7003142RFT31473283SHDT31363315VELOCITY8403314 -
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 typeCONDUCTOR30302.036303.50.00LOTSURF.COND.20700.026716.01.76LOTINTERM.13 3/81603.017 1/21618.01.90LOTINTERM.9 5/83135.012 1/43140.02.06LOTLINER73314.08 1/23314.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured7161.2545.036.0spud mud15101.1550.025.0water based18601.3551.013.0water based23721.4752.018.0water based28001.6551.015.0water based30051.6556.018.0water based31441.7260.014.0water based -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3265.60[m ]3253.85[m ]3154.80[m ]3147.90[m ] -
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]pdf0.18