6305/12-2
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Generell informasjon
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Brønnhistorie
GeneralWell 6305/12-2 is located in the southwestern part of block 6305/12 in the Slørebotn Sub-basin. The primary objectivewas to test the hydrocarbon and reservoir potential of a stratigraphic Cretaceous Wedge Prospect of anticipated Aptian to Cenomanian age. The secondary objective was to test the reservoir quality and hydrocarbon potential of a structural closure at the Base Cretaceous level called the E-prospect.Operations and resultsWildcat well 6305/12-2 was spudded with the semi-submersible installation Deepsea Bergen on 16 October and drilled to TD at 3162 m in the metamorphic basement. A kick occurred at 2973 m, in the top of Middle Jurassic sandstone, requiring increases in mud density to 1.45 sg and resulting in lost circulation further up the hole, most likely into the Paleocene Sandstone unit. After 7" liner was set to 2635 m background gas up to 10.5 %, formation gas peaks to 13.6 % and pumps-off gas peaks to 15.5 % made it necessary to increase the mud density in stages from 1.50 sg to 1.73 sg. The one successful FMT point, at 3000 m, showed formation pressure to be 1.69 sg in a very tight sandstone. The kick and technical problems related to coring led to two technical sidetracks that should be considered when evaluating logs and cores: the first from 2670 m to 2974 m and the second from 2910 m to final TD. The well was drilled with seawater and bentonite down to 437 m and with the ANCO-2000 KCl/glycol mud system from 437 m to TD.The mapped stratigraphic wedge supposed to be of Cretaceous age was encountered at 2970 m and proved to be Middle Jurassic sediments. The sediments were gas bearing, but with extremely poor reservoir properties. The possible reservoir in the E - prospect consisted of metamorphic basement with no significant porosity or permeability. Moderate shows were observed in the Late Cretaceous, in sandstone stringers from 2530 m to 2580 m and in limestone and dolomite stringers from 2630 m to 2730 m. Spotted moderate shows were recorded again in thin sandstone stringers in the Early Cretaceous from 2750 m to 2830. Poor to very poor shows were seen from 2965 m 3144.5 m in the Middle Jurassic. The organic geochemical source rock screening was seriously affected by glycols in the mud system, so the only source rocks that could be ascertained with certainty were the coals and carbargillites of the Middle Jurassic. A very thin Late Jurassic shale at 2966 m was not sampled. The well appears to be immature through the Cretaceous and in the oil window from base Cretaceous to TD.A total of 6 cores were cut at intervals through the well. Core 1 and 2 were cut in the first sidetrack and cores 3 - 6 were cut in the second sidetrack. One FMT fluid sample at 3001 m recovered water, mud filtrate and a small amount of gas.The well was permanently abandoned on 16 December as a well with shows in the Cretaceous and gas in Middle Jurassic tight sands.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]440.002979.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12964.02968.3[m ]22971.02975.0[m ]32975.02983.5[m ]43002.03009.6[m ]53016.03022.8[m ]63158.03160.7[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]33.9Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30222.036222.00.00LOTINTERM.13 3/8398.017 1/2400.01.38LOTINTERM.9 5/81229.012 1/41230.01.85LOTLINER72635.08 1/22635.00.00LOTOPEN HOLE3162.063162.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBIL SP GR26353159DIFL ACL ZDL CN SP GR CHT3981212FMT CHT GR29663037FMT CHT GR30013001MAC GR12003158MLL DLL ACL ZDL CN SP GR CHT26133158MWD - GR DIR26703162MWD - GR RES DIR1692973SWC GR29233135SWC GR29233081VSP2553155 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet16960111911191127418481919193619361980239524872487250529662966296729703145 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokument størrelse [KB]pdf0.56 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokument størrelse [KB]pdf1.48 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokument størrelse [KB]pdf15.88 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1741.3423.010.0WATER BASED20.12.19931851.3023.09.5WATER BASED20.12.19932261.03WATER BASED20.10.19932261.03WATER BASED20.10.19934371.50WATER BASED20.10.19934371.50WATER BASED20.10.19934371.20WATER BASED21.10.19936951.1016.08.0WATER BASED26.10.199312381.1023.08.5WATER BASED26.10.199312441.1426.010.0WATER BASED26.10.199312441.1422.09.0WATER BASED27.10.199312441.2022.09.5WATER BASED01.11.199315281.2026.015.5WATER BASED01.11.199318431.2030.015.0WATER BASED01.11.199319881.2024.016.0WATER BASED01.11.199322131.2524.015.0WATER BASED01.11.199325301.8222.011.0WATER BASED14.12.199325301.3015.07.5WATER BASED15.12.199325691.2524.016.0WATER BASED02.11.199326351.5028.015.5WATER BASED17.11.199326351.5029.016.0WATER BASED18.11.199326701.5025.015.0WATER BASED16.11.199326701.5026.015.0WATER BASED16.11.199326701.5029.015.5WATER BASED16.11.199326701.5024.012.0WATER BASED16.11.199328021.5030.018.0WATER BASED19.11.199328661.8242.012.0WATER BASED13.12.199328761.3532.020.0WATER BASED03.11.199328841.3531.016.5WATER BASED08.11.199328991.5030.017.5WATER BASED23.11.199329011.5530.017.5WATER BASED23.11.199329201.3534.021.0WATER BASED08.11.199329341.6040.019.0WATER BASED23.11.199329621.3534.021.0WATER BASED08.11.199329641.6341.019.0WATER BASED23.11.199329641.7344.018.0WATER BASED24.11.199329731.5234.021.5WATER BASED11.11.199329731.5034.021.5WATER BASED11.11.199329731.5036.017.0WATER BASED11.11.199329731.5036.017.0WATER BASED11.11.199329731.5024.011.0WATER BASED12.11.199329731.5036.017.0WATER BASED11.11.199329731.5023.012.0WATER BASED12.11.199329781.7344.016.0WATER BASED26.11.199329791.7343.015.5WATER BASED26.11.199329891.7341.012.5WATER BASED01.12.199330031.7341.012.0WATER BASED02.12.199330161.7340.012.5WATER BASED06.12.199330251.7341.013.0WATER BASED06.12.199331001.7341.015.0WATER BASED06.12.199331431.7341.016.5WATER BASED06.12.199331431.7341.015.0WATER BASED06.12.199331591.7341.015.0WATER BASED07.12.199331621.7339.014.5WATER BASED08.12.199331621.7643.015.0WATER BASED09.12.199331621.76WATER BASED13.12.199331621.7640.015.0WATER BASED13.12.199331621.7638.014.0WATER BASED13.12.1993 -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie440.0[m]DCRRI460.0[m]DCRRI480.0[m]DCRRI500.0[m]DCRRI520.0[m]DCRRI540.0[m]DCRRI560.0[m]DCRRI580.0[m]DCRRI600.0[m]DCRRI620.0[m]DCRRI640.0[m]DCRRI660.0[m]DCRRI680.0[m]DCRRI700.0[m]DCRRI720.0[m]DCRRI740.0[m]DCRRI760.0[m]DCRRI780.0[m]DCRRI800.0[m]DCRRI820.0[m]DCRRI840.0[m]DCRRI860.0[m]DCRRI880.0[m]DCRRI900.0[m]DCRRI920.0[m]DCRRI940.0[m]DCRRI960.0[m]DCRRI980.0[m]DCRRI1000.0[m]DCRRI1020.0[m]DCRRI1040.0[m]DCRRI1060.0[m]DCRRI1080.0[m]DCRRI1100.0[m]DCRRI1120.0[m]DCRRI1140.0[m]DCRRI1160.0[m]DCRRI1180.0[m]DCRRI1200.0[m]DCRRI1220.0[m]DCRRI1240.0[m]DCRRI1250.0[m]DCRRI1270.0[m]DCRRI1290.0[m]DCRRI1310.0[m]DCRRI1330.0[m]DCRRI1350.0[m]DCRRI1370.0[m]DCRRI1390.0[m]DCRRI1410.0[m]DCRRI1430.0[m]DCRRI1450.0[m]DCRRI1470.0[m]DCRRI1490.0[m]DCRRI1510.0[m]DCRRI1530.0[m]DCRRI1550.0[m]DCRRI1570.0[m]DCRRI1590.0[m]DCRRI1610.0[m]DCRRI1630.0[m]DCRRI1650.0[m]DCRRI1670.0[m]DCRRI1710.0[m]DCRRI1730.0[m]DCRRI1750.0[m]DCRRI1770.0[m]DCRRI1790.0[m]DCRRI1810.0[m]DCRRI1830.0[m]DCRRI1850.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1910.0[m]DCRRI1930.0[m]DCRRI1940.0[m]DCRRI1950.0[m]DCRRI1960.0[m]DCRRI1970.0[m]DCRRI1980.0[m]DCRRI1990.0[m]DCRRI2000.0[m]DCRRI2010.0[m]DCRRI2020.0[m]DCRRI2030.0[m]DCRRI2040.0[m]DCRRI2050.0[m]DCRRI2060.0[m]DCRRI2070.0[m]DCRRI2090.0[m]DCRRI2100.0[m]DCRRI2110.0[m]DCRRI2120.0[m]DCRRI2130.0[m]DCRRI2140.0[m]DCRRI2150.0[m]DCRRI2160.0[m]DCRRI2170.0[m]DCRRI2180.0[m]DCRRI2190.0[m]DCRRI2200.0[m]DCRRI2210.0[m]DCRRI2220.0[m]DCRRI2230.0[m]DCRRI2240.0[m]DCRRI2250.0[m]DCRRI2260.0[m]DCRRI2270.0[m]DCRRI2280.0[m]DCRRI2290.0[m]DCRRI2300.0[m]DCRRI2310.0[m]DCRRI2320.0[m]DCRRI2330.0[m]DCRRI2340.0[m]DCRRI2350.0[m]DCRRI2360.0[m]DCRRI2370.0[m]DCRRI2380.0[m]DCRRI2390.0[m]DCRRI2400.0[m]DCRRI2410.0[m]DCRRI2420.0[m]DCRRI2430.0[m]DCRRI2440.0[m]DCRRI2450.0[m]DCRRI2460.0[m]DCRRI2470.0[m]DCRRI2480.0[m]DCRRI2490.0[m]DCRRI2500.0[m]DCRRI2510.0[m]DCRRI2520.0[m]DCRRI2530.0[m]DCRRI2540.0[m]DCRRI2550.0[m]DCRRI2560.0[m]DCRRI2570.0[m]DCRRI2580.0[m]DCRRI2590.0[m]DCRRI2600.0[m]DCRRI2610.0[m]DCRRI2620.0[m]DCRRI2630.0[m]DCRRI2640.0[m]DCRRI2650.0[m]DCRRI2660.0[m]DCRRI2670.0[m]DCRRI2680.0[m]DCRRI2690.0[m]DCRRI2700.0[m]DCRRI2710.0[m]DCRRI2720.0[m]DCRRI2730.0[m]DCRRI2740.0[m]DCRRI2750.0[m]DCRRI2760.0[m]DCRRI2770.0[m]DCRRI2780.0[m]DCRRI2790.0[m]DCRRI2800.0[m]DCRRI2810.0[m]DCRRI2830.0[m]DCRRI2840.0[m]DCRRI2850.0[m]DCRRI2860.0[m]DCRRI2870.0[m]DCRRI2880.0[m]DCOD2880.0[m]DCRRI2885.0[m]DCOD2895.0[m]DCOD2895.0[m]DCRRI2900.0[m]DCOD2900.0[m]DCRRI2905.0[m]DCOD2905.0[m]DCRRI2910.0[m]DCOD2910.0[m]DCRRI2915.0[m]DCOD2915.0[m]DCRRI2920.0[m]DCOD2920.0[m]DCRRI2922.0[m]DCOD2925.0[m]DCOD2925.0[m]DCRRI2930.0[m]DCRRI2930.0[m]DCOD2935.0[m]DCOD2935.0[m]DCRRI2940.0[m]DCOD2940.0[m]DCRRI2945.0[m]DCOD2945.0[m]DCRRI2950.0[m]DCOD2950.0[m]DCRRI2955.0[m]DCRRI2955.0[m]DCOD2962.0[m]DCRRI2962.0[m]DCOD2964.0[m]COD2965.0[m]COD2965.0[m]DCRRI2966.0[m]COD2966.5[m]CRRI2966.9[m]CRRI2967.0[m]COD2968.0[m]COD2968.3[m]COD2968.3[m]CRRI2970.0[m]DCRRI2971.8[m]CRRI2972.0[m]DCRRI2973.7[m]CRRI2975.0[m]CRRI2983.0[m]CRRI3002.0[m]DCRRI3008.9[m]CRRI3124.0[m]DCRRI3147.0[m]DCRRI