35/11-25 A
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Generell informasjon
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Brønnhistorie
GeneralWell 35/11-25 A is a geological side-track to well 35/11-25 S. It was drilled on the Apodida prospect on the Lomre Terrace, North of the Troll Field in the North Sea. The primary objective of well 35/11-25 A was to prove petroleum in the Late Jurassic Etive Formation.Operations and resultsWildcat well 35/11 25 A was kicked off from 1519.4 m in the main well on 15 May 2021. It was drilled with the semi-submersible installation DeepSea Atlantic to TD at 3741 m (3237.7 m TVD) m in the Middle Jurassic Oseberg Formation. The well is vertical down to kick-off and deviated with a sail angle of ca 43 from there to TD. Operations proceeded without significant problems. The well was drilled with CarboSea oil-based mud from kick-off to 2934 m and with Syn Tec oil-based mud from 2934 m to TD.The Late Jurassic J56 and J52 sandstones within the Heather Formation were water filled as in the main well. While drilling top Etive Formation, LWD logs indicated presence of reservoir and hydrocarbons and it was decided to core. A 72 m core was recovered, before drilling continued into the Rannoch and Oseberg formations. About 55 metres of sandstone of moderate reservoir quality was penetrated in the Etive Formation. Wireline logging was performed after programme and proved water in the Etive Formation.There were no shows observed in the overburden. In the target reservoir interval, there were consistent shows on cuttings and core from base Ness Formation and through the Etive, Rannoch and Oseberg formations. Most shows are described as: Fair odour, no oil stain, even bright yellowish direct fluorescence, slow cloudy streaming blueish white cut fluorescence, good blueish white residual fluorescent ring.One core was cut from 3620 to 3692 m with 100.7% recovery. Fluid sampling was performed with the RCX sampling tool in the Ness Formation at 3608.5 m. The samples recovered water. Fluid scanning (no sample) was also performed at 3573.7m MD in the Ness Formation showing water.The well was permanently abandoned on 4 June 2021 as a dry well.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]1540.003741.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13620.03692.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]72.5Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet38238277880980915971597164316781797192420062086208622622557263326332917300730513091314335433543361436923723 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]DSL CN ZDL XMAC HDIL WGI23223731DSL FTEX MREX FLEX29333731GR VSP5753741LWD - GR RES DIR ECD15283741RCX SENT35723668 -
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 formasjonstestINTERM.13 3/81510.4161579.01.50FITLINER9 5/82933.012 1/42934.01.74FITOPEN HOLE3741.08 1/23741.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling16071.3628.08.0CARBOSEA29401.2215.07.0SynTeq37411.2215.07.0SynTeq