7220/5-3
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General information
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Wellbore history
GeneralWell 7220/5-3 was drilled to test the Skruis prospect on the Polhem Sub-platform 12 kilometres north of the 7220/8-1 Skrugard discovery in the Barents Sea. The primary objective was to prove petroleum in reservoir rocks from the Early-Middle Jurassic Age (the Stø and Nordmela formations). The secondary objective was to prove petroleum in reservoir rocks from the Early Jurassic Age (the Tubåen Formation).Operations and resultsWildcat well 7220/5-3 was spudded with the semi-submersible installation Songa Enabler on 27 September 2018 and drilled to TD at 1782 m in the Late Triassic Fruholmen Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis sweeps down to 493 m, with KCl/Polymer/GEM mud from 493 to 1030 m, and with Enviromul oil-based mud from 1030 m to TD.Top Stø Formation was encountered at 1413 m and contained a total oil column of about 35 m, 30 m of which was effective reservoir in sandstone with moderate to good reservoir quality. The oil/water contact was encountered at 1449 m, and good oil shows down to 1462 m, described with direct and cut fluorescence and light brown staining. The Stø Formation has about 30 meters of water-bearing sandstone below the oil/water contact, with mainly good reservoir properties. The Nordmela Formation has water-bearing sandstone layers totalling more than 100 meters with moderate to good reservoir quality. In the Tubåen Formation, the sandstone layers have moderate to good reservoir properties.No shows are reported outside of the Stø and Nordmela reservoir.One 72.4 m long core was cut from 1424 to 1496 m in the Stø and Nordmela formations. MDT fluid samples were taken at 1414.2 m (oil), 1426 m (oil), 1448 m (oil), and 1459 m (water).The well was permanently abandoned on 26 October 2018 as an oil discovery.TestingNo drill stem test was performed. -
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]620.001782.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11424.01496.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]72.5Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR36491.042493.00.00INTERM.13 3/81030.017 1/21030.01.40LOTINTERM.9 5/81346.012 1/41348.01.58LOTOPEN HOLE1782.08 1/21782.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT13491404MDT14131426MDT14141459MDT CMR14131660MWD LWD - ARC TELE4921782MWD LWD - TELE441492NGI MDT14041441XL ROCK13551753ZAIT PEX ECS MSIP NGIT13491781ZO VSP4381718 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit4414901009136413771413147916261692 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4681.0512.0Spud Mud4921.2518.0KCl/Polymer/GEM5351.2116.0KCl/Polymer/GEM8651.2118.0KCl/Polymer/GEM10301.2120.0KCl/Polymer/GEM10301.1224.0Enviromul13481.1227.0Enviromul13511.2219.0Enviromul15091.2220.0Enviromul17821.2219.0Enviromul -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory710.0[m]DCCGG730.0[m]DCCGG750.0[m]DCCGG770.0[m]DCCGG790.0[m]DCCGG810.0[m]DCCGG830.0[m]DCCGG850.0[m]DCCGG870.0[m]DCCGG900.0[m]DCCGG910.0[m]DCCGG930.0[m]DCCGG950.0[m]DCCGG970.0[m]DCCGG990.0[m]DCCGG1010.0[m]DCCGG1030.0[m]DCCGG1050.0[m]DCCGG1070.0[m]DCCGG1090.0[m]DCCGG1110.0[m]DCCGG1130.0[m]DCCGG1150.0[m]DCCGG1170.0[m]DCCGG1190.0[m]DCCGG1210.0[m]DCCGG1230.0[m]DCCGG1250.0[m]DCCGG1270.0[m]DCCGG1290.0[m]DCCGG1310.0[m]DCCGG1330.0[m]DCCGG1348.0[m]DCCGG1355.0[m]DCCGG1357.0[m]DCCGG1363.0[m]DCCGG1364.5[m]SWCCGG1369.0[m]DCCGG1375.0[m]DCCGG1381.0[m]DCCGG1387.0[m]DCCGG1393.0[m]DCCGG1396.8[m]SWCCGG1399.0[m]DCCGG1405.0[m]DCCGG1406.5[m]SWCCGG1410.6[m]SWCCGG1411.0[m]DCCGG1412.8[m]SWCCGG1413.5[m]SWCCGG1414.0[m]DCCGG1417.0[m]DCCGG1420.0[m]DCCGG1424.9[m]CCGG1429.9[m]CCGG1435.0[m]CCGG1439.8[m]CCGG1443.9[m]CCGG1446.2[m]CCGG1446.7[m]CCGG1451.9[m]CCGG1457.0[m]CCGG1471.9[m]CCGG1480.7[m]CCGG1483.4[m]CCGG1484.7[m]CCGG1487.3[m]CCGG1492.5[m]CCGG1499.5[m]SWCCGG1501.0[m]DCCGG1507.0[m]DCCGG1513.0[m]DCCGG1519.0[m]DCCGG1525.0[m]DCCGG1531.0[m]DCCGG1537.0[m]DCCGG1543.0[m]DCCGG1549.0[m]DCCGG1555.0[m]DCCGG1561.0[m]DCCGG1567.0[m]DCCGG1573.0[m]DCCGG1579.0[m]DCCGG1585.0[m]DCCGG1591.0[m]DCCGG1597.0[m]DCCGG1603.0[m]DCCGG1609.0[m]DCCGG1613.7[m]SWCCGG1615.0[m]DCCGG1621.0[m]DCCGG1627.0[m]DCCGG1633.0[m]DCCGG1634.1[m]SWCCGG1639.0[m]DCCGG1645.0[m]DCCGG1651.0[m]DCCGG1657.0[m]DCCGG1663.0[m]DCCGG1669.0[m]DCCGG1675.0[m]DCCGG1681.0[m]DCCGG1687.0[m]DCCGG1692.7[m]SWCCGG1693.0[m]DCCGG1699.0[m]DCCGG1705.0[m]DCCGG1708.0[m]SWCCGG1711.0[m]DCCGG1717.0[m]DCCGG1723.0[m]DCCGG1729.0[m]DCCGG1735.0[m]DCCGG1741.0[m]DCCGG1747.0[m]DCCGG1753.0[m]DCCGG1759.0[m]DCCGG1765.0[m]DCCGG1771.0[m]DCCGG1777.0[m]DCCGG