34/2-3
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General information
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Wellbore history
GeneralBlock 34/2 lies at the very northern end of the Tampen Spur and is located at the convergence of pre-Cretaceous Highs trending through Block 34/4 from Brent/Statfjord, from Dunlin/Murchison, from the 34/10 area and from a similar high trend through Block 34/5 from Block 34/8. The block was awarded in License 56 in 1979. The first well in the License (34/2-1) was spudded on 29 December 1979 and junked and abandoned on 19 February 1980 at 850 m, due to technical problems. As the first well did not satisfy License commitments, it was agreed among the partners that Well 34/2-2 would be drilled at the same location with the same objectives. This well was drilled to 4074 m and plugged and abandoned after having found poor reservoir conditions and no hydrocarbon accumulations. Well 34/2-3 was drilled 3.25 km to the northwest of Well 34/2-2 on the northern end of the Tampen Spur. The main objective was to test the sedimentary section below the Base Cretaceous Unconformity in a seismically defined northeasterly trending horst block.Operations and resultsThe well was spudded with the semi-submersible installation SEDCO 703 on 15 May 1981. Due to boulder beds at the location the first 36-inch interval was unsuccessful. The well was respudded on 17 May 1981 and drilled to TD at 3742 m in the Late Triassic Lunde Formation. The well was drilled with spud mud down to 815 m, with gypsum/lignosulphonate from 815 m to 3340 m, and with gel/chemtrol/lignosulphonate from 3340 m to TD.While drilling between 820 m and 890 m shallow gas was encountered, giving readings of up to 7% total gas. However, this caused no drilling problems.The well penetrated Tertiary and Cretaceous sediments down to the Barremian Rødby Formation, which was found unconformably overlying Late Triassic Lunde Formation. No significant reservoir zones were encountered above Top Trias. The Lunde Formation consisted of interbedded shales, siltstones, sandstones, and some thin conglomerate beds with the best reservoir properties in the upper section from 3351 m to 3396 m. Apart from the shallow gas there were no significant gas shows until 2335 m to 2440 m where background total gas readings of 1.8% were noted, Cl through to C3 being present. A maximum of 3.4% total gas was recorded at 2370 m. Trace to minor oil shows were recorded sporadically in limestone stringers and sandstones from 2190 m down to 3300 m. From 3300 m to 3370 m oil shows were noted in sandstone, siltstone and limestone throughout the section. At 3360 m, following a drilling break, a small flow into the well was detected. A soft shut in was initiated utilizing the annular bop. Shut in drill pipe and casing pressures indicated a formation pore pressure of 14.6 ppg EMW. The well kick was killed with 15.0 ppg mud. The bottoms-up sample was collected which appeared to contain traces of hydrocarbons. Following the drill break at 3360 m three consecutive cores were cut in the Triassic Hegre Group from 3360.5 m to 3405 m. The core barrel from the first core also contained some oil. Good oil shows were recorded in the most permeable sandstones throughout the cored section and oil bleeding was observed from sandstone and fractures. Wire line logs were run before and after setting the 13 3/8" and 9 5/8" casing and in the 8 1/2" open hole. RFT fluid samples were taken at depths 3354.2 m, 3373 m, 3374.3 m, and 3381.5 m. No hydrocarbons were recovered in any of the samples, only mud filtrate and water.The well was plugged and abandoned as a dry hole with shows on 13 August 1981.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]810.003742.50 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13360.53372.6[m ]23377.63396.2[m ]33396.53404.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]38.6Cores 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 typeLaboratory1500.0[m]DCROBERTSO1510.0[m]DCROBERTSO1520.0[m]DCROBERTSO1530.0[m]DCROBERTSO1540.0[m]DCROBERTSO1550.0[m]DCROBERTSO1560.0[m]DCROBERTSO1570.0[m]DCROBERTSO1580.0[m]DCROBERTSO1590.0[m]DCROBERTSO1600.0[m]DCROBERTSO1610.0[m]DCROBERTSO1620.0[m]DCROBERTSO1630.0[m]DCROBERTSO1640.0[m]DCROBERTSO1650.0[m]DCROBERTSO1660.0[m]DCROBERTSO1670.0[m]DCROBERTSO1680.0[m]DCROBERTSO1690.0[m]DCROBERTSO1700.0[m]DCROBERTSO1710.0[m]DCROBERTSO1720.0[m]DCROBERTSO1730.0[m]DCROBERTSO1740.0[m]DCROBERTSO1750.0[m]DCROBERTSO1760.0[m]DCROBERTSO1770.0[m]DCROBERTSO1790.0[m]DCROBERTSO1800.0[m]DCROBERTSO1810.0[m]DCROBERTSO1820.0[m]DCROBERTSO1830.0[m]DCROBERTSO1840.0[m]DCROBERTSO1850.0[m]DCROBERTSO1860.0[m]DCROBERTSO1870.0[m]DCROBERTSO1880.0[m]DCROBERTSO1890.0[m]DCROBERTSO1900.0[m]DCROBERTSO1910.0[m]DCROBERTSO1920.0[m]DCROBERTSO1930.0[m]DCROBERTSO1940.0[m]DCROBERTSO1950.0[m]DCROBERTSO1960.0[m]DCROBERTSO1970.0[m]DCROBERTSO1980.0[m]DCROBERTSO -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit414141814511872187219161982198221942825283431053105333733443344 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.52 -
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]pdf46.19 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL CCL GR4112015CBL VDL CCL GR16003305CST00CST25323340DLL MSFL SP CAL GR33363575DLL MSFL SP CAL GR35003741FDC CNL CAL GR20303342FDC CNL CAL GR33363575FDC CNL CAL GR35003741HDT20303340HDT33363575HDT35003741ISF LSS SP CAL GR8022036ISF LSS SP GR20303341ISF LSS SP GR33363576ISF LSS SP GR33363742RFT GR33543575RFT GR33733373VSP00 -
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 typeCONDUCTOR30494.036506.00.00LOTSURF.COND.20802.026815.01.56LOTINTERM.13 3/82030.017 1/22040.01.77LOTINTERM.9 5/83336.012 1/43341.02.05LOTOPEN HOLE3741.08 1/23741.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4930.00spud mud8220.00spud mud12991.0741.0water mud20401.3151.0water mud25231.5550.0water mud27641.5649.0water mud32491.5756.0water mud33411.6750.0water mud33601.8461.0water mud37421.8452.0water mud -
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