31/2-2
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Generell informasjon
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Brønnhistorie
GeneralWell 31/2-2 was drilled some 4 km east of the discovery well 31/2-1 on seismic line 79-416 at SP 200. The concession requirement for the wells were complete penetration of the prospective Jurassic sequence and terminate in Triassic or older. The particular objectives of well 31/2-2 were: to evaluate lateral variation of reservoir parameters eastwards on the flank of the structure: to test the zone of oil shows seen in 31/2-1 in better reservoir conditions, to test the gas accumulation in a down-dip location: to evaluate the nature of the seismic flatspot, and to provide geological calibration of seismic reflectors above the reservoir for improved regional evaluation.Operations and resultsWell was spudded with the semi-submersible installation West Venture on 27 February 1980 and drilled to TD at 1857 m in the Middle Jurassic Krossfjord Formation. The 36" hole was drilled without incident to 433 m using seawater with viscous pills spotted on connections. From 422 m to 433 m hard drilling was experienced. This was interpreted as a boulder bed similar to that found at a comparable depth in the previous 31/2-1 well. Problems were encountered with the stability of the temporary guide base, and the well had to be abandoned. The rig was moved NE 25 m and re-spudded on 29 February. The well was drilled with seawater and hi-vis pills down to 800 m, and with gypsum/lignosulphonate mud from 800 m to TD.Top reservoir (Sognefjord Formation) came in at 1544 m and was gas bearing down to a gas/oil contact at 1579 m, and oil-bearing from 1579 m down to an oil/water contact at 1591 m. Both contacts were clearly defined on logs, the gas/oil contact was confirmed by RFT pressure gradients, and moveable oil was confirmed by RFT sampling at 1587.5 m and 1590 m. Gas samples were obtained from 1548 m and 1571 m. Weak oil shows began at 1561 m in the gas zone, strong shows with stained and bleeding cores and a paraffinic smell were observed in the oil zone. Oil shows ceased at 1602 m.Coring started at 1515 m in the Draupne Formation and terminated below the oil-water contact. A 120 m interval was cored with 94.2 m of core in 13 cores recovered at surface.After coring and logging of the Late Jurassic sandstones the well was suspended at the 9 5/8 casing shoe and the rig towed to Bergen for inspection and repairs on 22 April 1980.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]490.002600.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve – topp dybdeKjerneprøve – bunn dybdeKjerneprøve dybde – enhet11515.01521.1[m ]21525.01527.0[m ]31535.01547.6[m ]41553.01560.0[m ]51560.01569.0[m ]61569.01578.0[m ]71578.01581.0[m ]81585.01598.0[m ]91598.01603.6[m ]101604.01606.4[m ]111608.01617.0[m ]121617.01626.0[m ]131626.01632.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]94.2Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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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 formasjonstestCONDUCTOR30398.036400.00.00LOTSURF.COND.20768.026780.01.72LOTINTERM.13 3/81438.017 1/21448.01.64LOTINTERM.9 5/81817.012 1/41826.01.65LOTOPEN HOLE2568.08 1/22568.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL CCL GR7751825CBL GR CCL3541844FDC CNL GR CAL430797FIT15061506FIT15951595HDT14691855HDT18452590ISF BHC GR SP430809ISF BHC GR SP18002590LSS CTR18452590LSS GR14691855MSFL DLL SP CAL14691855RFC CNL GR CAL18002590RFT10RFT28VELOCITY00 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet35565065070311241124120513031374142414241431147014701545166517001848 -
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Dokumenter – rapportert av utvinningstillatelsen (Frigitt i henhold til regelverk) Dokument navnDokument formatDokumentstørrelse [MB].pdf0.55.pdf2.78.pdf1.22.pdf0.84.pdf1.32.pdf0.77.pdf2.48.pdf0.70.pdf1.79.pdf3.90.pdf24.38.pdf0.27.pdf11.26.pdf3.96.pdf0.17.pdf12.76.pdf12.64.pdf3.02.pdf0.30.pdf8.88.pdf0.16.pdf6.68.pdf0.13.pdf0.79.pdf6.21.pdf2.42.pdf0.03.pdf1.75.pdf8.22.pdf11.62.pdf0.06.pdf2.58.pdf28.43.pdf0.30.pdf0.32.pdf0.09.pdf3.79.pdf1.33.pdf2.76.pdf0.03.pdf1.52.pdf0.51.pdf1.99.pdf0.04.pdf1.48.pdf0.70.pdf1.37.pdf5.02.pdf1.83.pdf0.89.pdf0.02.pdf0.48.pdf7.44.pdf0.28.pdf0.07.pdf0.02.pdf0.19.pdf10.03.pdf6.20.pdf8.08.pdf1.07.pdf0.57.pdf14.80.pdf19.85.pdf8.36.pdf0.75.pdf9.04.pdf12.53.pdf0.77.pdf0.86.pdf8.95.pdf5.70 -
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Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling7081.2241.0seawater10001.2249.0seawater14081.2250.0seawater16241.2645.0seawater -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie870.0[m]DCGEOCH900.0[m]DCGEOCH930.0[m]DCGEOCH960.0[m]DCGEOCH990.0[m]DCGEOCH1167.0[m]DCGEOCH1203.0[m]DCGEOCH1233.0[m]DCGEOCH1263.0[m]DCGEOCH1287.0[m]DCGEOCH1317.0[m]DCGEOCH1347.0[m]DCGEOCH1377.0[m]DCGEOCH1398.0[m]DCGEOCH1428.0[m]DCGEOCH1455.0[m]DCGEOCH