30/2-3
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General information
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Wellbore history
GeneralWell 30/2-2 was drilled on the Huldra Field in the North Sea. The objective was to appraise the gas/condensate discovery in the Brent Group and reduce the gas-in-place estimates for the field.Operations and resultsAppraisal well 30/2-2 was spudded with the semi-submersible installation Ross Isle on 11 June 1992 and drilled to TD at 4325 m in the Early Jurassic Eiriksson Formation. A pilot hole was drilled to 520 m to check for shallow gas. No gas was detected. Drilling proceeded without significant problems. Tool sticking was common in the reservoir section during logging runs. The well was drilled with seawater down to 209 m, with gel spud mud from 209 m to 1115 m, with gypsum/polymer mud from 1115 m to 2298 m, and with Ancotherm mud from 2298 m to TD.Although a well-defined Gas-Water-contact was encountered in 30/2-3 at 3896 m, this was some 75 m shallower than the previously deepest gas-down-to for well 30/2-2. This indicates that the Huldra Field is more complex than previously thought. Good porosity and permeability were encountered in all gas bearing intervals, reducing uncertainties regarding well productivity. There were no shows above Brent reservoir level. Below the GWC weak shows on sandstone in the cores gradually diminished down to 3962 m where shows disappeared altogether.A total of 178.4 m core was recovered in 17 cores, from 3749 m in the Heather Formation through all of the Brent Group and down to 3985 m at top Drake Formation. The core-to-log depth correction varied between -0.4 to +1.9 m. No wire line fluid samples were taken.The well was permanently abandoned on 5 October 1992 as a gas/condensate appraisal well.TestingThree drill stem tests were performed in the Brent Group.DST 1 tested the interval 3895 - 3898 m in the Ness Formation. The average production rates towards the end of the Cleanup/ Main Flow period were approximately 43000 Sm3/d of gas, 24 Sm3/d of condensate and 129 Sm3/d of formation water. This proved a GWC in the tested interval. The condensate density was 0.810 g/cm3 and the gas gravity was 0.720 (air =1). The temperature at reference depth 3895 m was 149.0 °C.DST 2 tested the interval 3874 - 3881 m in the Ness Formation. The average gas and condensate production rates during the Main Flow were 671000 Sm3/d and 319 Sm3/d respectively through a 12.7 mm (32/64") choke size. This gave a GOR close to 2100 Sm3/Sm3 at the prevailing separator conditions. The condensed or dissolved water production was approx. 6-8 m3/d. The condensate density was 0.0.800 g/cm3 and the gas gravity was 0.700 (air =1). DST 2 confirmed very good reservoir properties in the tested interval. The temperature at reference depth 3895 m was 147.5 °C.DST 3 te3sted the interval 3794 -3803 m in the Tarbert Formation. The average gas and condensate production rates during the Main Flow were 466800 Sm3/d and 215 Sm3/d respectively through a 12.7 mm (32/64") choke size. This gave a GOR of approx. 2170 Sm3/Sm3 at the prevailing separator conditions. The condensed or dissolved water production was approx. 4-6 m3/d. The condensate density was 0.0.797 g/cm3 and the gas gravity was 0.0.690 (air =1). DST 3 confirmed moderate reservoir properties in the tested interval. The temperature at reference depth 3895 m was 146.0 °C. -
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]1120.004323.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13749.03755.9[m ]23756.03761.1[m ]33792.03813.3[m ]43816.03829.1[m ]53830.03836.3[m ]63836.33855.0[m ]73855.13867.0[m ]83868.03873.9[m ]93857.03886.5[m ]103886.53897.0[m ]113897.73915.0[m ]123915.63928.0[m ]133928.13932.0[m ]153954.53962.0[m ]163962.03968.8[m ]173968.83986.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]194.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTDST13895.000.0009.09.1992 - 01:00YESDSTDST23874.000.0015.09.1992 - 22:00YESDSTDST33794.000.0023.09.1992 - 13:00YES -
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 typeCONDUCTOR30205.036206.00.00LOTINTERM.201099.0261100.01.70LOTINTERM.13 3/82283.017 1/22285.01.91LOTINTERM.9 5/83706.012 1/43708.02.05LOTLINER74088.08 1/24325.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03895389812.72.03874388112.73.13794380312.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.04.0002.053.00040.0003.114.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02443000.8100.72017902.03196710000.8000.70021003.12154668000.7970.6902180 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR16502283CBL VDL GR29723692CBL VDL GR35504041CST GR11182227CST GR37083952CST GR37173722DIL BHC MSFL GR37064323DIL SLS GR CAL10993723DLL GR37063875FMS GR37064000LDL CNL GR22803722LDL CNL NGT37064325MWD2094325RFT HP GR37974317VSP17804324 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit145815879879193619362011207721852185243834193543359935993620364236723672370937923792380839343944397439833983416141994241428842884294 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.54pdf3.15pdf1.15pdf1.93 -
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]pdf22.86 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5201.03WATER BASED7561.03WATER BASED10991.03WATER BASED11151.03WATER BASED15971.3935.0WATER BASED22981.5942.0WATER BASED23011.6433.0WATER BASED23461.6735.0WATER BASED26041.7540.0WATER BASED27421.7532.0WATER BASED28591.7536.0WATER BASED28941.7837.0WATER BASED29731.7838.0WATER BASED30441.7836.0WATER BASED31491.7836.0WATER BASED32841.7830.0WATER BASED35451.8228.0WATER BASED35601.8228.0WATER BASED37231.8537.0WATER BASED37231.8537.0WATER BASED37271.8527.0WATER BASED37491.8526.0WATER BASED37561.8526.0WATER BASED37911.8743.0WATER BASED37921.8930.0WATER BASED37931.85DUMMY38161.85DUMMY38301.87DUMMY38551.8732.0WATER BASED38861.8730.0WATER BASED39111.8732.0WATER BASED39531.8733.0WATER BASED39681.8729.0WATER BASED40111.8726.0WATER BASED40911.8727.0WATER BASED43251.8618.0WATER BASED43251.8717.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1130.0[m]DCGEOST1160.0[m]DCGEOST1190.0[m]DCGEOST1210.0[m]DCGEOST1230.0[m]DCGEOST1300.0[m]DCGEOST1342.0[m]DCGEOST1354.0[m]DCGEOST1420.0[m]DCGEOST1447.0[m]DCGEOST1477.0[m]DCGEOST1492.0[m]DCGEOST1501.0[m]DCGEOST1516.0[m]DCGEOST1528.0[m]DCGEOST1543.0[m]DCGEOST1558.0[m]DCGEOST1564.0[m]DCGEOST1579.0[m]DCGEOST1600.0[m]DCGEOST1645.0[m]DCGEOST1660.0[m]DCGEOST1675.0[m]DCGEOST1702.0[m]DCGEOST1759.0[m]DCGEOST1783.0[m]DCGEOST1804.0[m]DCGEOST1825.0[m]DCGEOST1846.0[m]DCGEOST1858.0[m]DCGEOST1882.0[m]DCGEOST2191.0[m]DCGEOST2257.0[m]DCGEOST2278.0[m]DCGEOST2296.0[m]DCGEOST2320.0[m]DCGEOST2340.0[m]DCGEOST2360.0[m]DCGEOST2380.0[m]DCGEOST2400.0[m]DCGEOST2420.0[m]DCGEOST2440.0[m]DCGEOST2460.0[m]DCGEOST2480.0[m]DCGEOST2500.0[m]DCGEOST2520.0[m]DCGEOST2540.0[m]DCGEOST2560.0[m]DCGEOST2580.0[m]DCGEOST2600.0[m]DCGEOST2620.0[m]DCGEOST2640.0[m]DCGEOST2660.0[m]DCGEOST2680.0[m]DCGEOST2700.0[m]DCGEOST2720.0[m]DCGEOST2740.0[m]DCGEOST2770.0[m]DCGEOST2780.0[m]DCGEOST2800.0[m]DCGEOST2820.0[m]DCGEOST2840.0[m]DCGEOST2860.0[m]DCGEOST2880.0[m]DCGEOST2900.0[m]DCGEOST2920.0[m]DCGEOST2940.0[m]DCGEOST2960.0[m]DCGEOST2980.0[m]DCGEOST3000.0[m]DCGEOST3020.0[m]DCGEOST3040.0[m]DCGEOST3060.0[m]DCGEOST3080.0[m]DCGEOST3100.0[m]DCGEOST3120.0[m]DCGEOST3140.0[m]DCGEOST3160.0[m]DCGEOST3180.0[m]DCGEOST3200.0[m]DCGEOST3220.0[m]DCGEOST3240.0[m]DCGEOST3260.0[m]DCGEOST3280.0[m]DCGEOST3300.0[m]DCGEOST3320.0[m]DCGEOST3340.0[m]DCGEOST3360.0[m]DCGEOST3380.0[m]DCGEOST3400.0[m]DCGEOST3420.0[m]DCGEOST3520.0[m]DCGEOST3540.0[m]DCGEOST3560.0[m]DCGEOST3580.0[m]DCGEOST3600.0[m]DCGEOST3618.0[m]DCGEOST3624.0[m]DCGEOST3627.0[m]DCGEOST3636.0[m]DCGEOST3645.0[m]DCGEOST3654.0[m]DCGEOST3672.0[m]DCGEOST3681.0[m]DCGEOST3690.0[m]DCGEOST3699.0[m]DCGEOST3708.0[m]DCGEOST3708.5[m]SWCSTATO3717.0[m]SWCSTATO3717.0[m]DCGEOST3728.0[m]SWCSTATO3729.0[m]DCGEOST3735.0[m]SWCSTATO3738.0[m]DCGEOST3747.0[m]DCGEOST3749.5[m]CGEOST3758.5[m]CGEOST3765.0[m]DCGEOST3774.0[m]DCGEOST3783.0[m]DCGEOST3789.5[m]SWCSTATO3791.5[m]SWCSTATO3792.0[m]DCGEOST3792.5[m]SWCSTATO3794.8[m]CGEOST3804.6[m]CGEOST3807.7[m]CGEOST3812.0[m]CGEOST3821.7[m]CGEOST3830.2[m]CGEOST3837.3[m]CGEOST3845.2[m]CGEOST3852.2[m]CGEOST3860.0[m]CGEOST3867.0[m]CGEOST3875.7[m]CGEOST3883.8[m]CGEOST3887.2[m]CGEOST3894.3[m]CGEOST3902.8[m]CGEOST3910.2[m]CGEOST3919.3[m]CGEOST3927.6[m]CGEOST3932.7[m]CGEOST3934.5[m]SWCSTATO3938.0[m]SWCSTATO3944.0[m]SWCSTATO3949.5[m]SWCSTATO3954.5[m]CGEOST3962.5[m]CGEOST3967.6[m]CGEOST3973.0[m]CGEOST3974.6[m]CGEOST3979.4[m]CGEOST3981.3[m]CGEOST3986.2[m]CGEOST3990.0[m]DCGEOST3999.0[m]DCGEOST4008.0[m]DCGEOST4017.0[m]DCGEOST4026.0[m]DCGEOST4035.0[m]DCGEOST4044.0[m]DCGEOST4053.0[m]DCGEOST4062.0[m]DCGEOST4071.0[m]DCGEOST4080.0[m]DCGEOST4095.0[m]DCGEOST4098.0[m]DCGEOST4107.0[m]DCGEOST4116.0[m]DCGEOST4128.0[m]DCGEOST4134.0[m]DCGEOST4146.0[m]DCGEOST4152.0[m]DCGEOST4161.0[m]DCGEOST4170.0[m]DCGEOST4179.0[m]DCGEOST4188.0[m]DCGEOST4197.0[m]DCGEOST4206.0[m]DCGEOST4215.0[m]DCGEOST4224.0[m]DCGEOST4233.0[m]DCGEOST4242.0[m]DCGEOST4251.0[m]DCGEOST4260.0[m]DCGEOST4269.0[m]DCGEOST4278.0[m]DCGEOST4287.0[m]DCGEOST4293.0[m]DCGEOST4299.0[m]DCGEOST4308.0[m]DCGEOST4317.0[m]DCGEOST4323.0[m]DCGEOST