35/4-1
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General information
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Wellbore history
GeneralWell 35/4-1 was committed to test the hydrocarbon potential of Jurassic sandstones. The main target was the Brent Group. The Cook and Statfjord Formations were secondary targets. In addition the well should establish a good seismic tie.Operations and resultsWell 35/4-1 was spudded with the semi-submersible rig "Treasure Saga"on 24 December 1996 and reached TD on 30 April 1997 at a depth of 4936 m in the Triassic Hegre Group, fulfilling the objectives of the target depth. Including an expanded coring programme the activities lasted for 155 days, some 63 days behind the original budget. The main contribution for the budget overrun were bad weather conditions, technical problems in the well, technical problems for the drilling contractor, slow penetration rate in the lower sections section and a comprehensive plug and abandonment programme. The well was drilled water based to 3138 m (bentonite to 1362 m and ANCO 2000 mud from 1362 m to 3138 m) and oil based (ANCOVERT) from 3138 m to TD.
The well was found to be dry with weak hydrocarbon shows from the Eocene throughout the entire underlying section and into the Statfjord Formation. The well encountered sands within the Eocene, Dunlin Group and Statfjord Formation. The Brent Group, which was the primary target, contained mostly silts and very little sands of reservoir quality. High formation pressure was detected from the upper part of the Cretaceous to TD with a maximum of 1.84 rd recorded in the Brent Group.
Seven cores were cut in the interval 4084 m to 4266 m in the Brent Group and two cores in the Lower Jurassic (4447 m to 4475 m and 4709 m to 4737 m). The well was plugged and abandoned as a well with shows.
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]1365.004937.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14084.04093.4[m ]24093.54107.5[m ]34108.54113.7[m ]44113.54140.8[m ]54141.04177.1[m ]64178.04222.4[m ]74222.14266.0[m ]84447.04474.9[m ]94708.04737.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]237.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30464.536464.50.00LOTINTERM.201350.0261362.00.00LOTINTERM.13 3/83118.017 1/23133.00.00LOTINTERM.9 5/83720.012 1/43720.00.00LOTOPEN HOLE4936.08 1/24936.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR29503720CST GR14602353CST GR32504928DIL DSI LDL CNL AMS SP GR13503720DIL DSI LDL CNL NGT AMS36714294MDT GR40814877OBDT DSI ACTS GR37204942PI LDL CNL NGS AMS42254940VSP GR4703700VSP GR AMS32804922 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit4041116166516951720172017681807188319121912203333263500351036753675369536954079428742874434451547044918 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.78 -
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]pdf27.86 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured11281.3914.0WATER BASED13001.3917.0WATER BASED13621.3020.0WATER BASED19201.3023.0WATER BASED21811.3024.0WATER BASED24961.3024.0WATER BASED27061.3021.0WATER BASED28451.3021.0WATER BASED30401.3025.0WATER BASED31331.3928.0WATER BASED31381.3926.0WATER BASED31471.3932.0OIL BASED31591.3930.0OIL BASED31781.3938.0OIL BASED32521.3932.0OIL BASED33241.3930.0OIL BASED33431.3928.0OIL BASED34281.3930.0OIL BASED34801.3930.0OIL BASED35261.3932.0OIL BASED35641.4533.0OIL BASED36251.4533.0OIL BASED36581.5833.0OIL BASED36971.7039.0OIL BASED37111.7534.0OIL BASED37151.7534.0OIL BASED38021.7535.0OIL BASED38371.7532.0OIL BASED38681.7630.0OIL BASED39541.8336.0OIL BASED39921.8335.0OIL BASED39921.8335.0OIL BASED41081.8938.0OIL BASED41131.8937.0OIL BASED41391.8937.0OIL BASED41411.8938.0OIL BASED41741.8938.0OIL BASED41781.8938.0OIL BASED41901.9550.0OIL BASED42191.8937.0OIL BASED42451.8938.0OIL BASED42631.8937.0OIL BASED42671.8937.0OIL BASED42941.8938.0OIL BASED43241.9542.0OIL BASED44641.9545.0OIL BASED46691.9546.0OIL BASED47091.9546.0OIL BASED47371.9544.0OIL BASED48261.9547.0OIL BASED48771.9548.0OIL BASED49341.9548.0OIL BASED49361.9550.0OIL BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1370.0[m]DCRRI1380.0[m]DCRRI1390.0[m]DCRRI1400.0[m]DCRRI1410.0[m]DCRRI1420.0[m]DCRRI1430.0[m]DCRRI1440.0[m]DCRRI1450.0[m]DCRRI1460.0[m]DCRRI1470.0[m]DCRRI1480.0[m]DCRRI1487.0[m]DCRRI1490.0[m]DCRRI1500.0[m]DCRRI1642.0[m]DCRRI1655.0[m]DCRRI1700.0[m]DCRRI1720.0[m]DCRRI1760.0[m]DCRRI1770.0[m]DCRRI1780.0[m]DCRRI1788.0[m]DCRRI1790.0[m]DCRRI1800.0[m]DCRRI1825.0[m]SWCRRI1847.0[m]SWCRRI1871.0[m]SWCRRI1885.0[m]DCRRI1900.0[m]DCRRI1905.0[m]DCRRI1910.0[m]DCRRI1922.0[m]SWCRRI1925.0[m]DCRRI1930.0[m]DCRRI1935.0[m]DCRRI1940.0[m]DCRRI1945.0[m]DCRRI2346.0[m]SWCRRI3140.0[m]DCRRI3160.0[m]DCRRI3180.0[m]DCRRI3200.0[m]DCRRI3220.0[m]DCRRI3240.0[m]DCRRI3260.0[m]DCRRI3280.0[m]DCRRI3300.0[m]DCRRI3320.0[m]DCRRI3330.0[m]DCRRI3340.0[m]DCRRI3360.0[m]DCRRI3380.0[m]DCRRI3400.0[m]DCRRI3420.0[m]DCRRI3440.0[m]DCRRI3460.0[m]DCRRI3480.0[m]DCRRI3500.0[m]DCRRI3520.0[m]DCRRI3526.0[m]SWCRRI3560.0[m]DCRRI3570.0[m]DCRRI3580.0[m]DCRRI3590.0[m]DCRRI3600.0[m]DCRRI3610.0[m]DCRRI3620.0[m]DCRRI3635.0[m]DCRRI3640.0[m]DCRRI3660.0[m]DCRRI3670.0[m]DCRRI3680.0[m]DCRRI3690.0[m]DCRRI3730.0[m]DCRRI3740.0[m]DCRRI3750.0[m]DCRRI3760.0[m]DCRRI3770.0[m]DCRRI3780.0[m]DCRRI3790.0[m]DCRRI3800.0[m]DCRRI3810.0[m]DCRRI3820.0[m]DCRRI3830.0[m]DCRRI3840.0[m]DCRRI3850.0[m]DCRRI3860.0[m]DCRRI3870.0[m]DCRRI3880.0[m]DCRRI3890.0[m]DCRRI3900.0[m]DCRRI3910.0[m]DCRRI3920.0[m]DCRRI3930.0[m]DCRRI3940.0[m]DCRRI3950.0[m]DCRRI3960.0[m]DCRRI3970.0[m]DCRRI3985.0[m]DCRRI3990.0[m]DCRRI4000.0[m]DCRRI4010.0[m]DCRRI4020.0[m]DCRRI4030.0[m]DCRRI4040.0[m]DCRRI4050.0[m]DCRRI4060.0[m]DCRRI4070.0[m]DCRRI4080.0[m]DCRRI4119.4[m]CRRI4124.3[m]CRRI4129.9[m]CRRI4134.6[m]CRRI4137.6[m]CRRI4142.8[m]CRRI4147.7[m]CRRI4151.1[m]CRRI4154.8[m]CRRI4158.5[m]CRRI4161.6[m]CRRI4166.5[m]CRRI4171.6[m]CRRI4176.0[m]DCRRI4177.0[m]CRRI4182.0[m]CRRI4186.0[m]CRRI4191.0[m]CRRI4196.0[m]CRRI4202.0[m]CRRI4206.0[m]CRRI4210.0[m]CRRI4215.0[m]CRRI4223.0[m]CRRI4227.0[m]CRRI4232.0[m]CRRI4237.0[m]CRRI4241.0[m]CRRI4245.0[m]CRRI4250.0[m]CRRI4255.0[m]CRRI4257.0[m]DCRRI4261.0[m]CRRI4265.0[m]CRRI4266.0[m]DCRRI4382.0[m]DCRRI4392.0[m]DCRRI4405.0[m]DCGEOLAB4409.9[m]CRRI4410.0[m]DCGEOLAB4415.0[m]DCGEOLAB4420.0[m]DCGEOLAB4425.0[m]DCGEOLAB4430.0[m]DCGEOLAB4435.0[m]DCGEOLAB4437.0[m]DCGEOLAB4440.0[m]DCGEOLAB4442.0[m]DCGEOLAB4445.0[m]DCGEOLAB4447.0[m]DCGEOLAB4453.7[m]CRRI4453.9[m]CRRI4460.0[m]DCGEOLAB4461.0[m]CRRI4461.7[m]CRRI4462.0[m]DCGEOLAB4465.0[m]DCGEOLAB4467.0[m]DCGEOLAB4467.2[m]CRRI4470.0[m]DCGEOLAB4471.4[m]CRRI4472.0[m]DCGEOLAB4474.9[m]CRRI4475.0[m]DCGEOLAB4480.0[m]DCGEOLAB4715.8[m]CRRI4731.6[m]CRRI4735.5[m]CRRI4842.0[m]DCRRI4845.0[m]DCRRI -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4451.70[m ]4452.00[m ]4454.80[m ]4461.70[m ]4469.77[m ]4710.00[m ]4711.20[m ]4719.26[m ]4724.00[m ]4733.00[m ]4479.00[m ]4482.00[m ]4485.00[m ]4487.00[m ]4490.00[m ]4492.00[m ]4495.00[m ]4497.00[m ]4500.00[m ]4505.00[m ]4507.00[m ]4510.00[m ]4512.00[m ]