2/4-15 S
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Generell informasjon
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Brønnhistorie
GeneralThe primary purpose of well 2/4-15 S was to control and kill the underground blow out in well 2/4-14. Well 2/4-15 S was planned deviated from a location ca 1 km south of the 2/4-14 location to intersect with the 2/4-14 well bore below the bottom hole assembly that had been left in this hole. The well would serve several possible uses:- Assist in killing 2/4-14 below the BHA.- To check and verify the extent of underground pressure charging, zone isolation and underground blowouts, and to cure and verify possible cross flows.- To serve as an emergency relief well to dynamically kill an uncontrolled blow out in well 2/4-14.- To be used as an exploration well if the top intervention was successful.Shallow gas was predicted at 611 m where a seismic anomaly corresponds to a gas bearing sand layer in well 2/4-14Operations and resultsWildcat Relief well 2/4-15 S was spudded 31 January 1989 by the semi-submersible installation Treasure Saga. The well was spudded 1182 m south of the 2/4-14 spud location and drilled to 4962 m where it intersected with the 2/4-14 well bore. This point is recognized as TD of the well. The well was drilled with sea water/gel mud down to 920 m, with KCl mud from 920 m to 3867 m, and with Hi-Temp polymer mud from 3867 m to TD. Shallow gas was encountered at 611 m as prognosed. Thin gas-bearing sands were seen on the resistivity MWD log also at 525 m and at 627 m. Drilling proceeded with significant problems due to rich smectite content between 1800 and 2300 m. The drill string got stuck twice, backed off, and after unsuccessful fishing, technical sidetracks were performed. On 1 May 1989, when drilling the 12 1/4" section in well 2/4-15 S, well 2/4-14 was re-entered with the jack up rig Neddrill Trigon. Both wells were now involved in the killing operations (see well history for 2/4-14 R). When drilling 2/4-15 S at around 4962 m, just prior to pulling above bottom and start circulating samples, the weight was suddenly lost and the string dropped clearly. At the same time mud losses were experienced. Immediately after, changes in the Production Logging Tool (PLT) readings were observed in the 2/4-14 re-entry, indicating clearly communication between wells. Pumping kill-mud and barite into well 2/4-15 S then killed the underground blow out.No FMT measurements were performed and no open hole wire line logs were run in well 2/4-15 S. Because of the special purpose of the well 2/4-15 S two special logs were run in this well. The Wellspot log was used to determine the distance and direction to the 2/4-14 well. The tool proved to be very reliable with an uncertainty in the determination of distance to the 2/4-14 well of less than one meter. A Sonan (noise) log was run to try to detect the flow path in the 2/4-14 well. The log showed a noise maximum at 4100 m indicating a hole in the drill pipe at this point. After the 2/4-14 well was killed, the Sonan log run over the same interval showed no peaks at this point, confirming that the flow at this time had been stopped. The Sonan log was also run in February and March 1990 to verify a killed well. No sidewall cores were attempted, and only one conventional core, for rock mechanical analyses, was cut in the Tor Formation from 3867 m to 3876.5 m with 26 % recoveryThe well kill operations were terminated 19 December 1989, and a cement plug was set with top at 4726 m. The well was now observed until 3 March 1990. After installing corrosion cap the well was suspended on 16 March 1990, 13 months and two days after spud.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]230.004951.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13867.03869.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]2.5Borekjerner 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 formasjonstestCONDUCTOR30216.036216.00.00LOTINTERM.20900.026920.01.75LOTINTERM.162100.0222096.01.85LOTINTERM.13 3/82500.017 1/22662.02.03LOTINTERM.13 3/82653.017 1/22662.02.03LOTINTERM.9 5/84505.012 1/44543.02.11LOTLINER74929.08 1/24930.00.00LOTOPEN HOLE4962.05 7/84962.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]AC CBL VDL GR1222653AC CBL VDL GR31004508AC CBL VDL GR43034890CDL CNL GR44604891DIF TEMP GR6504878MWD - GR RES DIR1754930PDK100 GR CCL43254700SONAN40004892TEMP25004880 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet9418543368336833873405345634973547355835583692426647984817489049584958 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.41 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf1.22 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf35.98 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.24pdf0.23 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1221.05WATER BASED02.02.19892161.05WATER BASED02.02.19892161.05WATER BASED03.02.19893011.118.017.3WATER BASED06.02.19898251.5735.05.8WATER BASED21.03.19898401.6729.05.8WATER BASED21.03.19899151.175.011.1WATER BASED06.02.19899151.165.010.1WATER BASED06.02.19899201.185.011.1WATER BASED08.02.19899201.18WATER BASED08.02.19899201.16WATER BASED20.02.19899601.2214.08.7WATER BASED21.02.198911121.5728.04.8WATER BASED28.03.198912501.2519.09.6WATER BASED22.02.198913221.5735.07.7WATER BASED28.03.198913981.2917.05.8WATER BASED23.02.198916131.6230.05.8WATER BASED28.03.198916871.4522.04.8WATER BASED24.02.198917201.7236.05.8WATER BASED07.04.198917201.6727.05.8WATER BASED03.04.198917201.6729.05.8WATER BASED05.04.198917201.6923.05.8WATER BASED05.04.198917551.7227.06.3WATER BASED07.04.198918181.5921.04.8WATER BASED03.03.198918531.6530.06.3WATER BASED28.03.198919001.6735.04.4WATER BASED28.03.198919001.6730.06.3WATER BASED28.03.198919071.7235.06.8WATER BASED10.04.198919201.6125.04.4WATER BASED07.03.198919201.6128.04.8WATER BASED07.03.198919201.5024.05.3WATER BASED27.02.198919881.7235.05.8WATER BASED10.04.198920101.7227.04.8WATER BASED14.04.198920101.7226.04.4WATER BASED14.04.198920101.7224.04.8WATER BASED18.04.198920101.7228.03.9WATER BASED18.04.198920101.7226.05.3WATER BASED18.04.198920101.7234.05.3WATER BASED11.04.198920101.7228.05.3WATER BASED12.04.198920101.7234.05.3WATER BASED11.04.198920931.5527.05.8WATER BASED27.02.198920931.5023.05.8WATER BASED27.02.198920931.5826.04.8WATER BASED28.02.198920931.5824.05.8WATER BASED01.03.198920931.5926.05.8WATER BASED03.03.198921001.7236.05.8WATER BASED10.04.198921201.6328.07.2WATER BASED07.03.198922101.6326.06.8WATER BASED08.03.198922981.7229.05.3WATER BASED18.04.198923311.6730.07.7WATER BASED28.03.198923631.6328.06.3WATER BASED09.03.198923631.6328.05.3WATER BASED10.03.198923631.6329.05.8WATER BASED13.03.198923631.6329.04.8WATER BASED13.03.198923631.6331.06.3WATER BASED13.03.198923631.6733.05.8WATER BASED15.03.198923631.6331.05.3WATER BASED09.03.198924281.6731.06.3WATER BASED16.03.198924281.6725.05.3WATER BASED30.03.198924281.6725.05.3WATER BASED31.03.198924281.6724.05.3WATER BASED03.04.198924281.6724.05.3WATER BASED03.04.198924281.6724.04.8WATER BASED29.03.198924531.7227.04.8WATER BASED19.04.198926441.6733.06.3WATER BASED16.03.198926441.6732.05.3WATER BASED17.03.198926441.6730.04.8WATER BASED20.03.198926441.6732.05.8WATER BASED20.03.198926731.7237.05.3WATER BASED20.04.198926731.7237.04.8WATER BASED24.04.198926731.7232.06.3WATER BASED24.04.198926731.7234.05.8WATER BASED24.04.198926731.7234.05.8WATER BASED26.04.198926731.7232.06.3WATER BASED24.04.198926781.7228.05.8WATER BASED26.04.198926841.7228.05.8WATER BASED27.04.198928031.7234.07.7WATER BASED28.04.198929551.7227.05.8WATER BASED02.05.198930731.7225.05.8WATER BASED02.05.198931261.7225.04.8WATER BASED02.05.198932031.7230.07.2WATER BASED02.05.198932501.7231.05.8WATER BASED03.05.198934001.7226.04.4WATER BASED05.05.198934311.7227.05.3WATER BASED05.05.198934331.7229.04.4WATER BASED09.05.198934621.7229.05.3WATER BASED09.05.198934971.7233.05.8WATER BASED09.05.198935311.7236.06.3WATER BASED12.05.198935581.7235.05.8WATER BASED12.05.198935651.7228.05.3WATER BASED12.05.198936211.7228.05.8WATER BASED12.05.198936701.7229.05.8WATER BASED16.05.198937031.7228.06.3WATER BASED16.05.198937401.7225.05.3WATER BASED16.05.198938111.7229.05.8WATER BASED16.05.198938111.7227.05.8WATER BASED18.05.198938111.7228.05.3WATER BASED18.05.198938111.7427.05.8WATER BASED19.05.198938111.7429.06.8WATER BASED23.05.198938161.7429.06.3WATER BASED23.05.198938671.7424.05.3WATER BASED23.05.198938671.7424.05.8WATER BASED23.05.198938751.7424.05.8WATER BASED25.05.198938801.7425.04.8WATER BASED25.05.198939161.7414.05.3WATER BASED26.05.198939601.7416.04.4WATER BASED29.05.198940171.7420.05.3WATER BASED30.05.198940451.7421.04.8WATER BASED30.05.198940751.7423.06.3WATER BASED01.06.198941371.7422.05.3WATER BASED01.06.198941701.7418.05.3WATER BASED01.06.198941811.7422.04.8WATER BASED05.06.198942191.749.6WATER BASED05.06.198942241.7420.04.4WATER BASED05.06.198942751.7422.05.3WATER BASED06.06.198943021.7423.04.8WATER BASED06.06.198943361.7425.04.8WATER BASED07.06.198943441.7421.04.8WATER BASED08.06.198943551.7422.03.9WATER BASED12.06.198944081.7420.04.8WATER BASED12.06.198944311.7418.04.4WATER BASED12.06.198944741.7418.04.4WATER BASED14.06.198945051.7820.05.8WATER BASED02.08.198945251.7420.04.8WATER BASED14.06.198945431.7419.05.3WATER BASED14.06.198945431.7419.04.4WATER BASED15.06.198945431.7418.04.4WATER BASED19.06.198945431.7418.04.4WATER BASED19.06.198945431.7418.04.4WATER BASED19.06.198945431.7418.04.4WATER BASED20.06.198945431.74WATER BASED20.06.198945431.74WATER BASED21.06.198945431.74WATER BASED26.06.198945481.7618.04.8WATER BASED05.07.198945481.7618.04.4WATER BASED05.07.198945481.7619.04.8WATER BASED05.07.198945481.7619.04.8WATER BASED05.07.198945501.7818.04.4WATER BASED05.07.198945511.7818.04.8WATER BASED05.07.198945511.7817.03.9WATER BASED07.07.198945511.7818.04.8WATER BASED07.07.198945511.7818.04.4WATER BASED10.07.198945511.7819.04.8WATER BASED10.07.198945511.7816.04.8WATER BASED14.07.198945511.7817.03.9WATER BASED14.07.198945511.7817.04.4WATER BASED14.07.198945511.7816.04.4WATER BASED17.07.198945511.7817.03.9WATER BASED17.07.198945511.7816.03.9WATER BASED17.07.198945511.7817.03.9WATER BASED20.07.198945511.7817.04.4WATER BASED20.07.198945511.7818.04.4WATER BASED20.07.198945511.7817.04.4WATER BASED21.07.198945511.7817.04.8WATER BASED25.07.198945511.7818.05.8WATER BASED25.07.198945511.7817.04.8WATER BASED26.07.198945511.7818.04.4WATER BASED31.07.198945511.7818.04.8WATER BASED31.07.198945511.7818.05.3WATER BASED31.07.198945511.7818.05.3WATER BASED31.07.198945511.7818.05.3WATER BASED02.08.198945511.7819.06.3WATER BASED02.08.198945511.7818.05.3WATER BASED03.08.198945511.7817.04.8WATER BASED07.08.198945511.7817.04.8WATER BASED07.08.198945511.7818.05.3WATER BASED07.08.198945511.7816.04.8WATER BASED09.08.198945511.7816.05.3WATER BASED09.08.198945511.7817.04.4WATER BASED09.08.198945511.7818.04.8WATER BASED11.08.198945511.7815.03.4WATER BASED15.08.198945511.7817.03.9WATER BASED15.08.198945511.7816.04.4WATER BASED10.07.198945511.7816.03.9WATER BASED14.07.198945511.7817.03.4WATER BASED25.07.198945511.7818.05.8WATER BASED31.07.198945511.7818.03.4WATER BASED11.08.198946001.7820.03.4WATER BASED15.08.198946581.7817.03.4WATER BASED15.08.198946581.7821.03.9WATER BASED25.08.198946581.7821.04.4WATER BASED25.08.198946861.8018.09.0WATER BASED06.09.198946891.7819.03.4WATER BASED25.08.198947141.7818.04.4WATER BASED25.08.198947141.7819.04.8WATER BASED25.08.198947141.7820.04.8WATER BASED25.08.198947141.7819.04.4WATER BASED25.08.198947331.7817.04.4WATER BASED25.08.198947561.7817.04.8WATER BASED25.08.198947571.7819.04.4WATER BASED25.08.198947791.7817.03.9WATER BASED28.08.198947861.7817.04.4WATER BASED28.08.198948111.7818.03.9WATER BASED29.08.198948111.7818.05.8WATER BASED29.08.198948141.7817.04.8WATER BASED05.09.198948451.7817.04.4WATER BASED05.09.198948511.7816.04.4WATER BASED05.09.198948631.7816.04.4WATER BASED05.09.198948631.7816.04.4WATER BASED05.09.198948631.7817.04.8WATER BASED05.09.198948861.8016.08.0WATER BASED08.09.198948861.8016.08.0WATER BASED07.09.198948961.8016.08.0WATER BASED12.09.198948961.9018.09.0WATER BASED12.09.198949051.9017.06.0WATER BASED12.09.198949091.9518.07.0WATER BASED12.09.198949101.9518.06.0WATER BASED13.09.198949301.9518.06.0WATER BASED19.09.198949301.9518.06.0WATER BASED19.09.198949301.9517.07.0WATER BASED19.09.198949301.9518.09.0WATER BASED20.09.198949301.9518.08.0WATER BASED22.09.198949301.9518.08.0WATER BASED25.09.198949301.9517.011.0WATER BASED26.09.198949301.9517.012.0WATER BASED26.09.198949301.9517.011.0WATER BASED26.09.198949301.9517.010.0WATER BASED27.09.198949301.9517.010.0WATER BASED28.09.198949301.9517.010.0WATER BASED29.09.198949301.9518.010.0WATER BASED29.09.198949301.9516.010.0WATER BASED03.10.198949301.9517.010.0WATER BASED03.10.198949301.9517.010.0WATER BASED03.10.198949301.9516.010.0WATER BASED05.10.198949301.9516.010.0WATER BASED06.10.198949301.9517.010.0WATER BASED09.10.198949301.9518.010.0WATER BASED09.10.198949301.9518.010.0WATER BASED10.10.198949301.9518.010.0WATER BASED10.10.198949301.9518.011.0WATER BASED10.10.198949301.9518.010.0WATER BASED11.10.198949301.9516.010.0WATER BASED16.10.198949301.9516.010.0WATER BASED16.10.198949301.9516.010.0WATER BASED16.10.198949301.9516.010.0WATER BASED18.10.198949301.9514.010.0WATER BASED23.10.198949301.9514.010.0WATER BASED23.10.198949301.9514.010.0WATER BASED23.10.198949301.9514.010.0WATER BASED23.10.198949301.9514.010.0WATER BASED23.10.198949301.9514.010.0WATER BASED23.10.198949301.9515.090.0WATER BASED27.10.198949301.9515.09.0WATER BASED27.10.198949301.9515.09.0WATER BASED31.10.198949301.9516.010.0WATER BASED31.10.198949301.9515.09.0WATER BASED31.10.198949301.9515.09.0WATER BASED31.10.198949301.9515.09.0WATER BASED31.10.198949301.9515.011.0WATER BASED02.11.198949301.9516.011.0WATER BASED08.11.198949301.9515.011.0WATER BASED08.11.198949301.9515.010.0WATER BASED08.11.198949301.9516.011.0WATER BASED09.11.198949301.9514.09.0WATER BASED10.11.198949301.9515.010.0WATER BASED13.11.198949301.9516.011.0WATER BASED13.11.198949301.9516.010.0WATER BASED14.11.198949301.9515.012.0WATER BASED15.11.198949301.9515.011.0WATER BASED16.11.198949301.9515.011.0WATER BASED17.11.198949301.9515.011.0WATER BASED20.11.198949301.9515.011.0WATER BASED20.11.198949301.9514.010.0WATER BASED21.11.198949301.9515.010.0WATER BASED24.11.198949301.9515.010.0WATER BASED27.11.198949301.9516.09.0WATER BASED27.11.198949301.9516.09.0WATER BASED27.11.198949301.9516.09.0WATER BASED27.11.198949301.9516.011.0WATER BASED29.11.198949301.9516.011.0WATER BASED30.11.198949301.9515.010.0WATER BASED04.12.198949301.9515.09.0WATER BASED05.12.198949301.9514.010.0WATER BASED05.12.198949301.9514.09.0WATER BASED05.12.198949301.9515.012.0WATER BASED07.12.198949301.9514.010.0WATER BASED11.12.198949301.9515.011.0WATER BASED11.12.198949301.9514.010.0WATER BASED11.12.198949301.9518.06.0WATER BASED19.09.198949301.9517.010.0WATER BASED10.10.198949301.9516.010.0WATER BASED13.10.198949301.9516.010.0WATER BASED16.10.198949301.9516.010.0WATER BASED19.10.198949301.9515.011.0WATER BASED02.11.198949301.9515.010.0WATER BASED08.11.198949301.9516.011.0WATER BASED08.11.198949301.9515.010.0WATER BASED13.11.198949301.9515.010.0WATER BASED20.11.198949301.9515.010.0WATER BASED23.11.198949301.9516.011.0WATER BASED28.11.198949301.9514.09.0WATER BASED05.12.198949301.9515.012.0WATER BASED07.12.198949302.2058.038.0WATER BASED28.12.198949302.2058.038.0WATER BASED29.12.198949321.9522.011.0WATER BASED11.12.198949321.9517.010.0WATER BASED13.12.198949622.2060.032.0WATER BASED08.01.199049622.2063.037.0WATER BASED02.01.199049622.2063.040.0WATER BASED02.01.199049622.2063.037.0WATER BASED03.01.199049622.2063.037.0WATER BASED03.01.199049622.2063.040.0WATER BASED03.01.199049622.1326.014.0WATER BASED15.12.198949622.2526.012.0WATER BASED18.12.198949622.2515.011.0WATER BASED18.12.198949622.2055.045.0WATER BASED27.12.198949622.2055.045.0WATER BASED27.12.198949622.2063.042.0WATER BASED27.12.198949622.2065.039.0WATER BASED27.12.198949622.2061.040.0WATER BASED27.12.198949622.2063.037.0WATER BASED02.01.199049622.2065.034.0WATER BASED20.12.198949632.2034.035.0WATER BASED22.12.198949632.2063.040.0WATER BASED03.01.199049632.2055.030.0WATER BASED09.01.199049632.2057.028.0WATER BASED12.01.199049632.2058.035.0WATER BASED15.01.199049632.2061.030.0WATER BASED22.01.199049632.2045.015.0WATER BASED07.02.199049632.2045.015.0WATER BASED09.02.199049632.2045.014.0WATER BASED13.02.199049632.2031.013.0WATER BASED26.02.199049632.2038.012.0WATER BASED01.03.199049632.2034.019.0WATER BASED09.03.199049632.2032.014.0WATER BASED13.03.199049632.2065.039.0WATER BASED27.12.198949632.1230.015.0WATER BASED18.12.198949632.2061.034.0WATER BASED05.01.199049632.2061.034.0WATER BASED05.01.199049632.2061.034.0WATER BASED05.01.199049632.2063.040.0WATER BASED02.01.199049632.2063.037.0WATER BASED08.01.199049632.2057.028.0WATER BASED10.01.199049632.2054.026.0WATER BASED12.01.199049632.2054.026.0WATER BASED12.01.199049632.2060.032.0WATER BASED15.01.199049632.2060.032.0WATER BASED15.01.199049632.2061.030.0WATER BASED16.01.199049632.2050.028.0WATER BASED17.01.199049632.2052.027.0WATER BASED22.01.199049632.2053.037.0WATER BASED22.01.199049632.2054.035.0WATER BASED22.01.199049632.2050.027.0WATER BASED23.01.199049632.2051.028.0WATER BASED24.01.199049632.2041.019.0WATER BASED26.01.199049632.2041.019.0WATER BASED29.01.199049632.2042.019.0WATER BASED29.01.199049632.2042.020.0WATER BASED29.01.199049632.2040.013.0WATER BASED29.01.199049632.2040.014.0WATER BASED30.01.199049632.2039.014.0WATER BASED01.02.199049632.2039.014.0WATER BASED02.02.199049632.2037.015.0WATER BASED05.02.199049632.2037.015.0WATER BASED05.02.199049632.2036.014.0WATER BASED05.02.199049632.2036.014.0WATER BASED05.02.199049632.2036.014.0WATER BASED07.02.199049632.2045.015.0WATER BASED12.02.199049632.2045.014.0WATER BASED13.02.199049632.2045.014.0WATER BASED13.02.199049632.2039.016.0WATER BASED13.02.199049632.2039.016.0WATER BASED14.02.199049632.2037.017.0WATER BASED15.02.199049632.2038.016.0WATER BASED19.02.199049632.2037.012.0WATER BASED19.02.199049632.2037.013.0WATER BASED20.02.199049632.2030.012.0WATER BASED21.02.199049632.2030.012.0WATER BASED23.02.199049632.2031.013.0WATER BASED26.02.199049632.2032.014.0WATER BASED26.02.199049632.2032.014.0WATER BASED26.02.199049632.2038.012.0WATER BASED27.02.199049632.2037.013.0WATER BASED01.03.199049632.2038.014.0WATER BASED05.03.199049632.2038.014.0WATER BASED06.03.199049632.2038.014.0WATER BASED06.03.199049632.2034.019.0WATER BASED06.03.199049632.2034.019.0WATER BASED06.03.199049632.2034.019.0WATER BASED08.03.199049632.2032.014.0WATER BASED12.03.199049632.2032.014.0WATER BASED13.03.199049632.2033.08.0WATER BASED14.03.199049632.2033.08.0WATER BASED14.03.199049632.2033.08.0WATER BASED16.03.199049631.9516.011.0WATER BASED14.12.198949632.1231.019.0WATER BASED19.12.198949631.9516.011.0WATER BASED13.12.198949632.1330.021.0WATER BASED14.12.1989