30/3-7 S
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General information
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Wellbore history
GeneralWell 30/3-7 S was drilled on the Veslefrikk Field, which is located due north of the Oseberg East Field. The objective of the well was to explore the hydrocarbon potential in the Brent Group, Intra Dunlin Sand and the Statfjord Formation in the B-prospect, west of the Veslefrikk horst.Operations and resultsWildcat well 30/3-7 S was spudded from the fixed surface installation Veslefrikk A on 21 September 1995 and drilled to TD at 5581 m in the Lunde Formation. The 24" hole section from 467 m to 1472 m was drilled with Sea water/PAC converted to KCl/polymer mud. The 17 1/2" section from 1472 m to 2870 m was drilled with KCl/PAC/XANVIS mud, the 12 1/4" and 8 1/2" sections from 2870 m to 5581 m was drilled with Ancovert oil based mud.The well drilled into the top of the Jurassic sequence earlier than expected, and hydrocarbon filled sandstones of unknown stratigraphy were penetrated almost 400 m higher than prognosed. The well was plugged back and a technical sidetrack was drilled and parts of the hydrocarbon filled interval was cored. Electric logs, core data, sidewall cores and paleo-dating as well as studies of the dip of layering and mineralogy, all show that the well penetrated several faults of varying throw. The stratigraphic intervals include both the Brent Group and the Statfjord Formation with several repeated and missing sequences. It soon became evident that the well never reached out to the B-prospect, but instead penetrated hydrocarbon bearing sandstones in several small fault blocks in the outskirts of the main Veslefrikk structure. A total of nine cores were cut, covering the base 2 m of the Heather Formation and ca 100 m of the faulted Brent sequence. RFT pressure points were recorded in the first Brent sequence (Tarbert/Ness) and in the second Brent sequence (Oseberg), but no fluid samples were taken on wire line.The well was completed on 12 December 1995 as an oil/gas discovery and reclassified to development well.TestingThree production tests were performed in the intervals 5050 m to 5100 m (DST1), 4871.5 m to 4894 m (DST2), and 4692 m to 4801 m (DST3). -
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]3850.005581.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14678.04689.8[m ]24691.04709.3[m ]34709.54719.0[m ]44719.54734.1[m ]54735.04740.3[m ]64742.04754.5[m ]74754.54758.4[m ]84760.04770.7[m ]94865.04871.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]93.0Cores 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 typeSURF.COND.201467.0241472.01.32LOTINTERM.13 3/82865.017 1/22870.01.65LOTINTERM.9 5/85064.012 1/45065.01.80LOTLINER75580.08 3/85581.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR50605360DIPL MAC ZDL CN GR50645581DPIL MAC CDL CN GR45005064FMT GR46915008FMT GR47354989FMT GR50715097GR SBT CCL14675581HEXDIP43005065MWD - GR RES DIR4675581SWC00UIB50605529VSP14675581 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit231785838963267026702804284431393139358839694667466746924692470247034703470647064718489749104928493049304966505650565063507051225122513851975234527153225322 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.45 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.09 -
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]pdf12.72 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9221.2223.0SEAWATER/PAC14721.2723.0KCL/PAC/XANVIS25321.5838.0KCL/PAC/XANVIS28701.6034.0KCL/PAC/XANVIS40261.5842.0ANCO VERT44411.5845.0ANCO VERT50651.5842.0ANCO VERT55811.54DUMMY -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory4450.0[m]DCGEOSTR4460.0[m]DCGEOSTR4470.0[m]DCGEOSTR4480.0[m]DCGEOSTR4490.0[m]DCGEOSTR4500.0[m]DCGEOSTR4510.0[m]DCGEOSTR4520.0[m]DCGEOSTR4530.0[m]DCGEOSTR4540.0[m]DCGEOSTR4550.0[m]DCGEOSTR4560.0[m]DCGEOSTR4570.0[m]DCGEOSTR4580.0[m]DCGEOSTR4590.0[m]DCGEOSTR4600.0[m]DCGEOSTR4610.0[m]DCGEOSTR4620.0[m]DCGEOSTR4630.0[m]DCGEOSTR4640.0[m]DCGEOSTR4650.0[m]DCGEOSTR4660.0[m]DCGEOSTR4660.0[m]DCFUGRO4670.0[m]DCGEOSTR4678.2[m]CWESTL4680.0[m]DCGEOSTR4680.0[m]DCFUGRO4681.2[m]CWESTL4681.8[m]CFUGRO4684.0[m]CWESTL4685.7[m]CWESTL4687.5[m]CFUGRO4689.8[m]CWESTL4690.0[m]DCGEOSTR4691.0[m]CWESTL4691.1[m]CFUGRO4692.2[m]CWESTL4694.5[m]CWESTL4700.0[m]DCGEOSTR4702.5[m]CWESTL4704.7[m]CWESTL4704.8[m]CFUGRO4705.6[m]CWESTL4707.4[m]CWESTL4708.8[m]CWESTL4710.0[m]DCGEOSTR4717.8[m]CWESTL4718.5[m]CWESTL4719.0[m]CWESTL4719.7[m]CWESTL4720.0[m]DCGEOSTR4725.4[m]CWESTL4729.7[m]CWESTL4730.0[m]DCGEOSTR4730.8[m]CFUGRO4733.0[m]CWESTL4740.0[m]DCGEOSTR4746.0[m]CWESTL4750.0[m]CWESTL4750.0[m]DCGEOSTR4753.5[m]CWESTL4753.5[m]CFUGRO4756.0[m]CFUGRO4756.2[m]CWESTL4760.0[m]DCGEOSTR4760.4[m]CWESTL4764.0[m]CWESTL4769.1[m]CWESTL4770.0[m]DCGEOSTR4774.0[m]DCGEOSTR4780.0[m]DCGEOSTR4783.0[m]DCGEOSTR4790.0[m]DCGEOSTR4792.0[m]DCGEOSTR4804.0[m]DCGEOSTR4810.0[m]DCGEOSTR4810.0[m]DCGEOSTR4819.0[m]DCGEOSTR4820.0[m]DCGEOSTR4828.0[m]DCGEOSTR4830.0[m]DCGEOSTR4837.0[m]DCGEOSTR4840.0[m]DCGEOSTR4846.0[m]DCGEOSTR4850.0[m]DCGEOSTR4855.0[m]DCGEOSTR4860.0[m]DCGEOSTR4866.5[m]CWESTL4869.6[m]CWESTL4870.0[m]DCGEOSTR4871.3[m]CWESTL4873.0[m]DCGEOSTR4880.0[m]DCGEOSTR4882.0[m]DCGEOSTR4890.0[m]DCGEOSTR4891.0[m]DCGEOSTR4900.0[m]DCGEOSTR4909.0[m]DCGEOSTR4910.0[m]DCGEOSTR4918.0[m]DCGEOSTR4920.0[m]DCGEOSTR4930.0[m]DCGEOSTR4936.0[m]DCGEOSTR4940.0[m]DCFUGRO4945.0[m]DCGEOSTR4950.0[m]DCFUGRO4954.0[m]DCGEOSTR4960.0[m]DCFUGRO4963.0[m]DCGEOSTR4966.0[m]DCFUGRO4972.0[m]DCGEOSTR4984.0[m]DCGEOSTR4993.0[m]DCGEOSTR4993.0[m]DCFUGRO5002.0[m]DCGEOSTR5011.0[m]DCGEOSTR5011.0[m]DCFUGRO5020.0[m]DCFUGRO5020.0[m]DCGEOSTR5029.0[m]DCGEOSTR5029.0[m]DCFUGRO5038.0[m]DCFUGRO5038.0[m]DCGEOSTR5056.0[m]DCGEOSTR5065.0[m]DCGEOSTR5075.0[m]DCGEOSTR5084.0[m]DCGEOSTR5093.0[m]DCGEOSTR5110.0[m]SWCWESTL5117.0[m]DCFUGRO5120.0[m]DCFUGRO5120.0[m]DCGEOSTR5129.0[m]DCFUGRO5130.0[m]SWCWESTL5132.0[m]DCFUGRO5135.0[m]DCFUGRO5138.0[m]DCGEOSTR5147.0[m]DCGEOSTR5153.0[m]DCFUGRO5155.0[m]SWCWESTL5156.0[m]DCFUGRO5162.0[m]DCFUGRO5165.0[m]DCGEOSTR5170.0[m]SWCWESTL5178.0[m]SWCWESTL5183.0[m]DCFUGRO5185.0[m]SWCWESTL5186.0[m]DCFUGRO5189.0[m]DCFUGRO5191.0[m]SWCWESTL5192.0[m]DCFUGRO5195.0[m]DCFUGRO5196.0[m]SWCWESTL5201.0[m]SWCWESTL5210.0[m]DCGEOSTR5228.0[m]DCGEOSTR5236.0[m]SWCWESTL5237.0[m]DCFUGRO5246.0[m]DCFUGRO5254.0[m]SWCWESTL5255.0[m]DCFUGRO5260.0[m]SWCWESTL5265.0[m]SWCWESTL5267.0[m]DCFUGRO5282.0[m]DCGEOSTR5291.0[m]DCGEOSTR5303.0[m]DCGEOSTR5327.0[m]DCGEOSTR5327.0[m]DCFUGRO5345.0[m]DCGEOSTR5363.0[m]DCGEOSTR5405.0[m]DCGEOSTR5423.0[m]DCGEOSTR5444.0[m]DCGEOSTR5465.0[m]DCGEOSTR5486.0[m]DCGEOSTR5507.0[m]DCGEOSTR5528.0[m]DCGEOSTR5549.0[m]DCGEOSTR -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4694.55[m ]4697.50[m ]4701.75[m ]4710.50[m ]4715.30[m ]4722.50[m ]4733.75[m ]4744.80[m ]4754.55[m ]4866.00[m ]