7220/11-5 S
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Generell informasjon
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Brønnhistorie
GeneralWell 7220/11-5 S was drilled to appraise the Alta oil and gas discovery on the Loppa High in the Barents Sea. The well was planned to drill horizontally through the Falk and Ørn formations oil leg in the Alta discovery. The objective was to demonstrate horizontal drillability through karstified and fractured carbonates using currently available technology. If successful, an extended test production was planned.Operations and resultsAppraisal well 7220/11-5 S was spudded with the semi-submersible installation Leiv Eiriksson on 6 April 2018. The well was drilled to TD in the 26” hole without significant problems. When installing BOP and riser the BOP suffered severe damage and 26.5 days were spent on repairs. After this drilling commenced without further significant issues. It was drilled vertical down to 1100 m, then building angle landing at 90° at 2375 m (1937 m TVD) in the oil leg in the Late Carboniferous Falk Formation. From this point it was drilled stratigraphically upwards from carbonates and heterolithics of the Falk Formation into younger carbonates of the Early Permian Ørn Formation. Well TD was set at 3057 m (1937 m TVD RKB) in the reef-type facies of the Ørn Formation. The well was drilled with seawater and hi-vis pills down to 478 m, with KCl/Polymer/GEM mud from 478 m to 794 m, with Performadril mud from 794 m to 2336 m, and with Baradril-N mud from 664 m to TD.Base Triassic/top Falk Formation gas-filled carbonates was encountered at 1911 m (1787 m TVD). The well penetrated a 117-metre TVD gas column in the Carboniferous Falk formation, and a 720-meter horizontal section was drilled in the Falk and Ørn formation. The horizontal section is situated 32 metres under the gas-oil contact at 2161 m (1905 m TVD), and 12 metres TVD over the regional oil-water contact. The reservoir consists of a mix of siliciclastic and carbonate rocks in the Falk formation and carbonate rocks in the Ørn formation from the Late Carboniferous to Early Permian period. The reservoir quality is good to very good.Above 1660 m numerous sandstone beds in the Snadd formation, varying in thickness from a meter to ca 20 m, had oil shows in the form of direct and cut fluorescence. Towards the top of the Snadd Formation the shows also included trace to 10% oil staining.No cores were cut. No fluid sample was taken on wireline, but extensive fluid sampling was conducted during the production test.After reaching final TD on 25 June 2018 the well bore was formally renamed as 7220/11-T-5 S for the long-term test. The well bore was permanently abandoned on 8 October 2018 as an oil and gas appraisal.TestingA successful long-term test of approximately two months duration was conducted beginning at 13 July 2018. The first main flow period of 30 days gave a controlled production rate of up to 1200 Sm3/day through a 60/64 inch choke. For the second main flow period of 35 days the rate was increased to up to 3000 Sm3/day through a 118/64 inch choke. The GOR during clean up and first flow period was 105 Sm3/Sm3, increasing to 165 Sm3/Sm3 at higher production rates in the second main flow. Two production logging runs (PLT) were performed during the production tests to measure the contribution from different reservoir zones. The production testing revealed good and very good reservoir properties and production rates without significant breakthrough of water or gas. About 110,000 Sm3 of liquid in total was produced during the test production. The temperature was measured by the downhole gauges during the extended well test. Based on these, the static formation temperature is estimated to be 72°C at 1927 m. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]480.003056.00 -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie490.0[m]DCAPT510.0[m]DCAPT530.0[m]DCAPT550.0[m]DCAPT570.0[m]DCAPT590.0[m]DCAPT -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligMDT0.000.00OIL31.07.2018 - 16:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet41141146246257857860860819041904191119112787 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]IBC CBL GR4941667IBC CBL GR4971729MRM EZSV9301036MWD LWD - GR RES AC DENS NEU4103052PLT-FSI PCMS GR CCL MAXTRAC18053036PLT-FSI RST PBMS MAXTRAC18003050 -
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 formasjonstestCONDUCTOR30477.536478.00.00SURF.COND.20787.426794.01.40FITINTERM.10 3/41847.612 1/41862.01.40FITLINER8 5/82330.09 1/22336.01.35FITLINER5 1/23051.08 1/23057.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4111.0518.0SWEEPS4111.001.0Drill water4241.5020.0KCL/Gem Kill Mud4501.0518.0SWEEPS4781.0520.0SWEEPS4781.5017.0KCL/Gem Kill Mud4791.3516.0KCL/Polymer/GEM4811.3417.0KCL/Polymer/GEM4971.3517.0KCL/Polymer/GEM5111.3615.0KCL/Poly/GEM5541.3918.0KCL/Polymer/GEM6211.4019.0KCL/Polymer/GEM7941.3924.0KCL/Poly/GEM7941.2214.0Performadril7941.0310.0Sea Water7941.4022.0KCL/Poly/GEM10751.2214.0KCL/Gem10751.3915.0KCL/Gem17741.3916.0KCL/Gem17741.060.1Riser completion fluid17741.270.1BRINE17831.2019.0Performadril18131.2218.0Performadril18471.2019.0Performadril18471.2218.0Performadril20481.2217.0Performadril21051.2019.0Performadril22601.1419.0Baradril-N22891.2019.0Performadril23301.1419.0BARADRIL-N23301.2017.0Performadril23401.1411.0BARADRIL-N26461.1512.0BARADRIL-N27561.1512.0BARADRIL-N27941.1411.0Performadril27941.1511.0BARADRIL-N28101.1413.0Performadril30571.1410.0Baradril-N30571.1418.0Baradril-N