34/6-5 S
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Generell informasjon
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Brønnhistorie
GeneralWell 34/6-5 S was drilled to test the Garantiana West prospect in the Northern part of the Tampen Spur in the North Sea. The primary objective was to prove oil and establish the oil-water contact in the Early Jurassic Cook Formation. Secondary objective was the Nansen Formation. In case of discovery a Drill Stem Test would be carried out.Operations and resultsWildcat well 34/6-5 S was spudded with the semi-submersible installation West Hercules on 18 March 2021 and drilled to TD at 4036 m (3982.8 m TVD) m in the Early Jurassic Cook Formation. Drilling started with a data acquisition 8 1/2' pilot hole drilled down to 1350 m, lithology in this interval is based on logs from this hole. No shallow gas was seen in the pilot hole. The main well was drilled vertical to 2800 m, building to a ~19 inclination from 3203 m and keeping same until TD. After reaching TD, the BHA got stuck while pulling out of hole at 3806 m. It was decided to drill a technical side-track to perform the wireline program on the Cook Formation and the Drill Stem Test operations. The 34/6-5 S T2 well was side-tracked from the 9 5/8" liner, through a milled window at 3474 m to 3480 m. It was drilled to a total depth of 3833 m (3781 m TVD) in the Burton Formation. The 34/6-5 S well was drilled with seawater and hi-vis pills down to 1370 m, with Versatec oil-based mud from 1370 m to 3535 m, and with Exploradrill oil-based mud from 3535 m to TD. The 34/6-5 S T2 well was drilled with Exploradrill oil-based mud from kick-off to 3833 m.Top of Cook Formation was encountered with oil at 3651 m (3619 m TVD). Pressure data and fluid sample densities indicated the oil-water contact to be at 3747.5 m (3703 m TVD). Pressure measurements indicate a similar pressure regime as found in the 34/6-3 A Akkar well. Sandstones in the Nansen Formation were water bearing. Apart from the hydrocarbon bearing Cook Formation there were no shows in the well.Two cores were cut in succession from 3695 to 3766.5 m in the side-track with 97.7 and 101% recoveries respectively. MDT fluid samples were taken at 3641. 4 m (oil with 4.5% - 5.0% mud contamination) and 3709.3 m (water).The well was permanently abandoned on 8 June 2021 as an oil discovery.TestingA DST was conducted in the Cook Formation in the side-track. The perforated interval was from 3673.97 - 3734 m (3636 3691 m TVD). The well flowed 550 Sm3/day during the main flow. PVT analysis gave a flash GOR of 79 Sm3/Sm3 and a STO oil density of 0.88 g/cm3. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1380.004036.60 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13662.83694.3[m ]23694.33765.8[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]103.0Borekjerner 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 formasjonstestINTERM.201363.0260.00.00INTERM.13 5/82420.017 1/22429.01.83LOTLINER9 5/83534.012 1/43484.02.02LOTLINER73831.08 1/23833.00.00OPEN HOLE4036.08 1/24036.00.00 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]LWD - GR ECD RES DI35354036LWD - GR ECD RES SON DEN NEU DI24293535LWD - GR RES DI4351370LWD - GR RES DI ECD13702429LWD - GR RES NEU DEN DI4161350PEX AIT MSIP13602418XPT GR36303657 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet41612621872187219081916203020412041224732073368336833763396340634743529352936543772 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling13601.3937.08.5Versatec16101.4742.012.0Versatec24291.6052.011.0Versatec24291.4744.012.0Versatec25571.6051.010.5Versatec30231.6155.013.5Versatec31431.6356.013.5Versatec33821.6763.013.5Versatec34751.8439.08.0Exploradrill35331.8240.010.5Exploradrill35351.7268.012.0Versatec36551.8432.09.5Exploradrill36621.8531.08.0Exploradrill38311.7236.06.5Exploradrill38331.8239.09.0Exploradrill38741.8536.06.5Exploradrill40361.8538.09.0Exploradrill