9/2-4 S
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General information
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Wellbore history
GeneralThe main objective for the deviated well 9/2-4 S was to appraise commercial hydrocarbon reserves in the southern part of the Upper Jurassic Gamma structure on the Yme field. Further to prove continuation of the equivalent shallow marine sandstone seen in well 9/2-1, with similar reservoir properties, and finally, to gather data for improved seismic velocity analysis on the southern part of the Gamma structure.Operations and resultsAppraisal well 9/2-4 S was spudded with the semi-submersible installation "DeepSea Bergen" on 25 December 1993 and drilled to a total depth of 4417 m (3313 m TVD) in the Middle Jurassic Bryne Formation. No shallow gas was encountered in the top-hole section. The well was drilled to 4090m MD using water based mud with bentonite and bentonite/CMC EHV down to 647 m. The 17 1/2" section (647 m to 2215 m) was drilled from the top to Early Cretaceous (Top Early Cretaceous at 1590 m) with KCl polymer mud, then converted to Anco 2000 mud by adding 3% glycol. Due to hole stability problems, the well was plugged back to 3755 m and a sidetrack was performed to TD at 4417m using ester based mud. The top Sandnes Formation was penetrated 13.5 m higher than prognosed, and top reservoir sand 17.5 m higher than prognosed. The oil/water contact was not evident in this well. However, the results from the MWD/LWD gave no indication of a different OWC than anticipated in the well 9/2-1 (3210 m TVD MSL). The estimated Net/Gross for the reservoir section is 0.67, which is slightly less than for the 9/2 - 1 well. This is compensated by an increased thickness of high reservoir quality. One core was cut in the interval 4150m - 4168.5 m in the Sandnes Formation. A segregated FMT fluid sample from 4132.6 m gave an oil with density of 0.83 g/cc (at surface condition) and the four pressure measurements from the FMT-log gave an oil gradient of 0.70 g/cc. The well was tied back with 9 5/8" casing and suspended 11 April 1994 as an oil appraisal. The well was then re-classified to development well.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]650.004090.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14150.04166.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]16.9Cores 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 typeCONDUCTOR30174.036175.00.00LOTCONDUCTOR20635.026637.01.74LOTINTERM.13 3/82200.017 1/22202.01.85LOTINTERM.9 5/83752.012 1/43755.00.00LOTLINER74417.08 1/24417.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR14604376CIM DIR912215DIFL ACL CHT GR21972628DIFL ACL GR6332208DIR22003925FMT GR41284163MWD RLL22154150RLL DIR182645SFD RLL43104417SLD RLL41504300 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1155217247247417537747847848551168154515811581172327302730307538753993409440944295 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.44 -
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]pdf9.70 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6451.03WATER BASED6471.3027.0WATER BASED6501.1018.0WATER BASED13351.3930.0WATER BASED15741.3930.0DUMMY22151.3929.0WATER BASED24271.3927.0WATER BASED28361.3926.0WATER BASED28641.3926.0WATER BASED29301.3926.0WATER BASED30161.4531.0WATER BASED30801.4533.0WATER BASED30861.5032.0WATER BASED31061.5033.0WATER BASED32601.5028.0WATER BASED32751.5025.0WATER BASED32981.5025.0WATER BASED33431.5029.0WATER BASED33941.5034.0WATER BASED34091.5041.0WATER BASED35371.5041.0WATER BASED36661.5040.0WATER BASED37651.7063.0OIL BASED37741.7039.0WATER BASED37881.7037.0WATER BASED38111.7063.0OIL BASED39151.7750.0WATER BASED39301.7059.0OIL BASED39591.5045.0WATER BASED39971.7058.0OIL BASED40901.7749.0WATER BASED41231.7058.0OIL BASED41501.7059.0OIL BASED41691.7057.0OIL BASED42491.7057.0OIL BASED42641.7058.0OIL BASED43091.7058.0OIL BASED43101.7058.0OIL BASED43131.7059.0OIL BASED43361.7058.0OIL BASED44171.7059.0OIL BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory650.0[m]DCGEOST660.0[m]DCGEOST670.0[m]DCGEOST680.0[m]DCGEOST690.0[m]DCGEOST700.0[m]DCGEOST710.0[m]DCGEOST720.0[m]DCGEOST730.0[m]DCGEOST740.0[m]DCGEOST750.0[m]DCGEOST760.0[m]DCGEOST770.0[m]DCGEOST780.0[m]DCGEOST1590.0[m]DCGEOST1610.0[m]DCGEOST1620.0[m]DCGEOST1640.0[m]DCGEOST1650.0[m]DCGEOST1670.0[m]DCGEOST1680.0[m]DCGEOST1700.0[m]DCGEOST1710.0[m]DCGEOST1730.0[m]DCGEOST1740.0[m]DCGEOST1760.0[m]DCGEOST1770.0[m]DCGEOST1790.0[m]DCGEOST1800.0[m]DCGEOST1820.0[m]DCGEOST1850.0[m]DCGEOST1860.0[m]DCGEOST1880.0[m]DCGEOST1890.0[m]DCGEOST1910.0[m]DCGEOST1920.0[m]DCGEOST1940.0[m]DCGEOST1950.0[m]DCGEOST1970.0[m]DCGEOST1980.0[m]DCGEOST2000.0[m]DCGEOST2010.0[m]DCGEOST2030.0[m]DCGEOST2040.0[m]DCGEOST2060.0[m]DCGEOST2070.0[m]DCGEOST2090.0[m]DCGEOST2100.0[m]DCGEOST2120.0[m]DCGEOST2130.0[m]DCGEOST2150.0[m]DCGEOST2160.0[m]DCGEOST2180.0[m]DCGEOST2190.0[m]DCGEOST2210.0[m]DCGEOST2220.0[m]DCGEOST2240.0[m]DCGEOST2250.0[m]DCGEOST2270.0[m]DCGEOST2280.0[m]DCGEOST2300.0[m]DCGEOST2310.0[m]DCGEOST2330.0[m]DCGEOST2340.0[m]DCGEOST2360.0[m]DCGEOST2370.0[m]DCGEOST2390.0[m]DCGEOST2400.0[m]DCGEOST2420.0[m]DCGEOST2430.0[m]DCGEOST2450.0[m]DCGEOST2460.0[m]DCGEOST2480.0[m]DCGEOST2490.0[m]DCGEOST2510.0[m]DCGEOST2520.0[m]DCGEOST2540.0[m]DCGEOST2550.0[m]DCGEOST2570.0[m]DCGEOST2580.0[m]DCGEOST2600.0[m]DCGEOST2610.0[m]DCGEOST2630.0[m]DCGEOST2640.0[m]DCGEOST2660.0[m]DCGEOST2670.0[m]DCGEOST2690.0[m]DCGEOST2700.0[m]DCGEOST2720.0[m]DCGEOST2730.0[m]DCGEOST2740.0[m]DCGEOST2750.0[m]DCGEOST2760.0[m]DCGEOST2780.0[m]DCGEOST2790.0[m]DCGEOST2800.0[m]DCGEOST2810.0[m]DCGEOST2820.0[m]DCGEOST2840.0[m]DCGEOST2850.0[m]DCGEOST2860.0[m]DCGEOST2870.0[m]DCGEOST2890.0[m]DCGEOST2900.0[m]DCGEOST2910.0[m]DCGEOST2920.0[m]DCGEOST2930.0[m]DCGEOST2950.0[m]DCGEOST2960.0[m]DCGEOST2970.0[m]DCGEOST2980.0[m]DCGEOST2990.0[m]DCGEOST3010.0[m]DCGEOST3020.0[m]DCGEOST3030.0[m]DCGEOST3040.0[m]DCGEOST3050.0[m]DCGEOST3070.0[m]DCGEOST3080.0[m]DCGEOST3090.0[m]DCGEOST3100.0[m]DCGEOST3110.0[m]DCGEOST3130.0[m]DCGEOST3140.0[m]DCGEOST3150.0[m]DCGEOST3160.0[m]DCGEOST3170.0[m]DCGEOST3190.0[m]DCGEOST3200.0[m]DCGEOST3210.0[m]DCGEOST3220.0[m]DCGEOST3230.0[m]DCGEOST3250.0[m]DCGEOST3260.0[m]DCGEOST3270.0[m]DCGEOST3280.0[m]DCGEOST3290.0[m]DCGEOST3310.0[m]DCGEOST3320.0[m]DCGEOST3330.0[m]DCGEOST3340.0[m]DCGEOST3350.0[m]DCGEOST3370.0[m]DCGEOST3380.0[m]DCGEOST3390.0[m]DCGEOST3400.0[m]DCGEOST3410.0[m]DCGEOST3430.0[m]DCGEOST3440.0[m]DCGEOST3450.0[m]DCGEOST3460.0[m]DCGEOST3470.0[m]DCGEOST3490.0[m]DCGEOST3500.0[m]DCGEOST3510.0[m]DCGEOST3520.0[m]DCGEOST3530.0[m]DCGEOST3550.0[m]DCGEOST3560.0[m]DCGEOST3570.0[m]DCGEOST3580.0[m]DCGEOST3590.0[m]DCGEOST3610.0[m]DCGEOST3620.0[m]DCGEOST3630.0[m]DCGEOST3640.0[m]DCGEOST3650.0[m]DCGEOST3670.0[m]DCGEOST3680.0[m]DCGEOST3690.0[m]DCGEOST3700.0[m]DCGEOST3710.0[m]DCGEOST3730.0[m]DCGEOST3740.0[m]DCGEOST3750.0[m]DCGEOST3760.0[m]DCGEOST3770.0[m]DCGEOST3790.0[m]DCGEOST3800.0[m]DCGEOST3810.0[m]DCGEOST3820.0[m]DCGEOST3830.0[m]DCGEOST3850.0[m]DCGEOST3860.0[m]DCGEOST3870.0[m]DCGEOST3880.0[m]DCGEOST3890.0[m]DCGEOST3910.0[m]DCGEOST3920.0[m]DCGEOST3930.0[m]DCGEOST3940.0[m]DCGEOST3950.0[m]DCGEOST3970.0[m]DCGEOST3980.0[m]DCGEOST3990.0[m]DCGEOST4000.0[m]DCGEOST4010.0[m]DCGEOST4030.0[m]DCGEOST4040.0[m]DCGEOST4050.0[m]DCGEOST4060.0[m]DCGEOST4070.0[m]DCGEOST4090.0[m]DCGEOST4099.0[m]DCGEOST4108.0[m]DCGEOST4117.0[m]DCGEOST4126.0[m]DCGEOST4135.0[m]DCGEOST4144.0[m]DCGEOST4150.9[m]CGEOST4151.1[m]CGEOST4153.0[m]DCGEOST4158.4[m]CGEOST4159.5[m]CGEOST4166.6[m]CGEOST4174.0[m]DCGEOST4183.0[m]DCGEOST4192.0[m]DCGEOST4201.0[m]DCGEOST4210.0[m]DCGEOST4219.0[m]DCGEOST4228.0[m]DCGEOST4237.0[m]DCGEOST4246.0[m]DCGEOST4255.0[m]DCGEOST4264.0[m]DCGEOST4273.0[m]DCGEOST4282.0[m]DCGEOST4291.0[m]DCGEOST4300.0[m]DCGEOST4309.0[m]DCGEOST4318.0[m]DCGEOST4327.0[m]DCGEOST4336.0[m]DCGEOST4345.0[m]DCGEOST4354.0[m]DCGEOST4363.0[m]DCGEOST4372.0[m]DCGEOST4381.0[m]DCGEOST4390.0[m]DCGEOST4399.0[m]DCGEOST4408.0[m]DCGEOST4414.0[m]DCGEOST