31/6-6
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General information
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Wellbore history
GeneralWell 31/6-6 was drilled in the Troll East gas province. It was designed to test possible gas accumulations in the Late to Middle Jurassic sandstones and to test the quality of a reservoir siltstone in the Heather Formation.Operations and resultsWell 31/6-6 was spudded with the semi-submersible installation Deepsea Bergen on 22 May 1984 and drilled to TD 2293 m in the Late Triassic Hegre Group. No significant problem was encountered in the operations. The well was drilled with spud mud down to 716 m, with KCl/polymer mud from 716 m to 1771.5 m, and with pre-hydrated bentonite/CMC mud from 1771.5 m to TD.The well encountered gas from top Heather reservoir at 1516 m to a GWC at 1568.5 m, 7.5 m into the Sognefjord Formation. No oil shows were reported from the well. Nine conventional cores were cut in the interval 1525 m to 1771.5 m in the Middle to Late Jurassic. FMT samples were taken at 1571.8 m and 1576.5 m in the Sognefjord Formation. Both contained formation water and mud filtrate.The well was completed on 29 July 1984 as a gas appraisal.TestingTwo drill stem tests were performed in the well. DST 1A tested 1562 m to 1567.5 m in the Sognefjord Formation sandstone. It produced maximum 779 x 10 Sm3 gas /day on a 64/64" choke. DST 2 from 1523 m to 1536 m in the Heather Formation siltstone showed a very low production rate, 10.7 x 10 Sm3/day. The reservoir temperature was 62.5 deg. C in DST 1A and 58 deg. C in DST 2. -
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]440.002290.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11525.01544.9[m ]21552.01575.9[m ]31579.51607.4[m ]41607.01633.5[m ]51634.51662.3[m ]61662.31689.4[m ]71689.41716.4[m ]81716.41744.6[m ]91744.61772.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]236.2Cores 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 typeLaboratory837.0[m]SWCLAP1015.0[m]SWCLAP1242.0[m]SWCLAP1395.0[m]SWCLAP1410.0[m]SWCLAP1425.0[m]SWCLAP1447.0[m]SWCSTAT1450.0[m]SWCLAP1455.0[m]SWCSTATO1460.0[m]SWCSTATO1471.0[m]SWCLAP1481.0[m]SWCSTATO1485.5[m]SWCSTATO1495.0[m]SWCSTATO1498.5[m]SWCLAP1505.5[m]SWCSTATO1510.0[m]SWCLAP1513.0[m]SWCSTATO1516.0[m]SWCSTAT1522.0[m]SWCSTATO1525.1[m]COD1526.5[m]COD1529.5[m]COD1532.8[m]COD1536.0[m]COD1537.7[m]COD1544.0[m]COD1547.0[m]SWCLAP1547.0[m]SWCSTAT1552.0[m]COD1552.1[m]COD1555.6[m]COD1556.5[m]COD1558.5[m]COD1560.5[m]COD1561.7[m]COD1562.2[m]COD1562.5[m]COD1562.9[m]COD1563.5[m]COD1564.0[m]COD1566.1[m]COD1567.5[m]COD1571.1[m]COD1572.8[m]COD1575.9[m]COD1577.0[m]SWCLAP1577.0[m]SWCSTAT1579.5[m]COD1580.0[m]COD1582.6[m]COD1583.1[m]COD1585.0[m]COD1585.6[m]COD1589.6[m]COD1591.2[m]COD1595.6[m]COD1596.1[m]COD1596.5[m]COD1602.5[m]COD1604.5[m]COD1605.5[m]COD1607.0[m]COD1607.5[m]COD1612.4[m]COD1613.2[m]COD1613.3[m]COD1615.5[m]COD1618.3[m]COD1620.1[m]COD1621.7[m]COD1624.0[m]COD1624.5[m]COD1624.6[m]COD1627.0[m]COD1631.4[m]COD1636.0[m]COD1636.5[m]COD1643.6[m]COD1644.5[m]COD1647.1[m]COD1650.5[m]COD1654.5[m]COD1654.6[m]COD1655.0[m]COD1658.8[m]COD1658.9[m]COD1662.9[m]COD1669.3[m]COD1669.5[m]COD1672.6[m]COD1672.8[m]COD1675.4[m]COD1680.2[m]COD1684.5[m]COD1687.8[m]COD1694.9[m]COD1698.0[m]COD1706.4[m]COD1707.6[m]COD1711.0[m]COD1713.8[m]COD1718.4[m]COD1725.4[m]COD1727.4[m]COD1734.4[m]COD1735.4[m]COD1738.0[m]COD1741.4[m]COD1745.8[m]COD1753.7[m]COD1754.0[m]COD1762.9[m]COD1763.6[m]COD1767.8[m]COD1768.6[m]COD1775.0[m]SWCLAP1780.0[m]SWCSTAT1795.0[m]SWCSTAT1805.0[m]SWCSTAT1810.0[m]SWCLAP1820.0[m]SWCSTAT1835.0[m]SWCSTAT1840.0[m]SWCLAP1850.0[m]SWCSTAT1860.0[m]SWCSTAT1870.0[m]SWCLAP1880.0[m]SWCSTAT1890.0[m]SWCSTAT1900.0[m]SWCSTAT1900.0[m]SWCLAP1910.0[m]SWCSTAT1925.0[m]SWCSTAT1935.0[m]SWCLAP1995.0[m]SWCLAP2020.0[m]SWCLAP2035.0[m]SWCLAP2056.0[m]SWCLAP2111.8[m]SWCLAP2134.2[m]SWCLAP2184.0[m]SWCLAP2221.9[m]SWCLAP2241.0[m]SWCLAP -
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 availableDSTDST1A0.000.0015.07.1984 - 00:00YESPRODTEST1A0.000.00CONDENSATE15.07.1984 - 03:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit336531650650798949101810181025120412041340139213921515156117061719194719762008204520452122219322252277 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.36 -
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]pdf23.66pdf8.01pdf0.39pdf3.77pdf0.34pdf1.14pdf3.82pdf0.16pdf6.33pdf12.62pdf11.08pdf13.55pdf5.05pdf1.33pdf55.71 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01563156725.42.01520153312.5Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0622.044.00011.00062Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.077902.0107 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ACBL VDL GR3331440ACBL VDL GR11001750CDL CNL GR CAL14392286CDL GR CAL6951455DIFL BHC AC GR SP CAL3302286DIPLOG14432286DLL MLL GR14391768FMT15231601VELOCITY5102275 -
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 typeCONDUCTOR30423.036425.00.00LOTSURF.COND.20699.026723.01.53LOTINTERM.13 3/81443.017 1/21460.01.55LOTINTERM.9 5/81755.012 1/41771.51.49LOTOPEN HOLE2290.08 1/22290.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3361.03120.0WATER BASED24.05.19844171.03120.0WATER BASED24.05.19844251.03120.0WATER BASED24.05.19844251.03120.0WATER BASED25.05.19844301.0346.0WATER BASED28.05.19847231.0640.0WATER BASED28.05.19847261.2239.0WATER BASED01.06.19848211.2244.0WATER BASED01.06.198410991.2346.0WATER BASED04.06.198412531.2346.0WATER BASED04.06.198413721.2348.019.0WATER BASED04.06.198414601.2350.019.0WATER BASED05.06.198414601.2351.018.0WATER BASED06.06.198414601.2354.018.0WATER BASED07.06.198414601.2352.019.0WATER BASED08.06.198414601.2350.018.0WATER BASED12.06.198414601.2350.019.0WATER BASED05.06.198414601.2351.018.0WATER BASED06.06.198414601.2354.018.0WATER BASED07.06.198414601.2352.019.0WATER BASED08.06.198414601.2350.018.0WATER BASED12.06.198415251.2149.020.0WATER BASED12.06.198415521.2152.017.0WATER BASED12.06.198415861.2151.017.0WATER BASED12.06.198416271.2152.016.0WATER BASED13.06.198416661.2149.017.0WATER BASED14.06.198417121.2149.017.0WATER BASED15.06.198417461.2149.09.0WATER BASED18.06.198417551.1053.07.0WATER BASED20.06.198417721.2149.08.0WATER BASED18.06.198418971.1049.08.0WATER BASED20.06.198421051.1050.07.0WATER BASED22.06.198422291.1048.013.0WATER BASED22.06.198422901.1043.012.0WATER BASED25.06.198422901.1041.011.0WATER BASED25.06.1984 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit0.00[m ]1637.00[m ]1568.00[m ]1517.50[m ]1513.80[m ]1505.60[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]pdf0.22