6507/2-5 S
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Generell informasjon
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Brønnhistorie
GeneralWell 6507/2-5 S (Ørn) is located on the Dønna Terrace in the Norwegian Sea, approximately 10 km southwest of the Marulk field. The objectives were to prove presence of hydrocarbons in the Fangst Group, Middle Jurassic shallow marine deposits in the Ørn structure, and acquire sufficient information on reservoir and fluid properties to be able to decide on a potential appraisal well for middle Jurassic discovery. If hydrocarbons are proven in Garn or Ile formations, the well would drill into Tofte and Tilje formations to clarify if these are water bearing. In addition, acquire data on reservoir and fluid properties in the Lysing Formation interval for regional understanding with the aim to clarify the relationship between logged resistivity, calculated saturation, and water salinity.Operations and resultsThe well was entered with the semi-submersible rig West Phoenix on 23 July 2019 and drilled to TD at 4230 m (4186 m TVD) in the Early Jurassic Tilje Formation. The well was drilled down to 1386 m with seawater and CMC spud sweeps, from 1386 to 2807 with Versatec oil-based mud and from 2807 to TD with Exploradrill oil-based mud. The well was drilled vertical until 2000 m where it started to build inclination in the 17 ½’’ and 12 ¼’’ hole sections, before returning to vertical before 12 ¼’’ hole section TD.The Lange Formation was penetrated at 2981 m (2918.4 m TVD MSL) and consists of predominantly claystone with single meter-scale limestone stringers as well as occurrences of sandstone bodies in the lower half. Unexpected hydrocarbon indications were observed in multiple levels within the Lange Formation. However, no moveable hydrocarbons were proven from logging results. A 16 meters thick Garn Formation sandstone was encountered at 4099 m (4016.4 m TVD MSL), 67 m deeper than original prognosis. The Ile Formation was encountered at 4107 m (4025 m TVD MSL), 35.6 m deeper than original prognosis and is dominated by a thicker sandstone interval in upper parts with varying siltstone and sandstone in lower parts. A 33 m gas column was indicated in a hydrocarbon down-to scenario. The results were supported by pressure gradients and fluid sampling in the Garn and Ile formations. One conventional core of 41.5 m was cut covering Garn to Ile formations from 4107.5 to 4149 m. MDT fluid samples were taken in the Lysing Formation at 2980 m (water), in the Garn Formation at 4099 m (gas), and in the Ile Formation at 4127.4 m (condensate), 4118 m (condensate), 4111.3 m (gas), and 4116 m (gas).The well was permanently plugged and abandoned on 14 September 2019 as a gas discovery 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]1390.004230.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet14107.04148.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]41.5Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet37154414401816181618731949194921452513295329532981370537053725409940994107415041504170 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]GR NGI PPC MSIP18204231MDT GR18701967MDT GR29563684MDT GR40994230MWD LWD - ARC TELE4332804MWD LWD - ARC TELE SONVIS ADN28043910MWD LWD - GVR ECOS TELES39104230QAIT NEXT LDS APS HNGS NMR39094231VSI411004230XLR GR29563707XLR GR40974200 -
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 formasjonstestCONDUCTOR36433.042435.00.00SURF.COND.201377.0261386.01.63FITINTERM.142796.017 1/22807.01.82FITLINER9 7/83909.012 1/43913.02.17LOTOPEN HOLE4230.08 1/24230.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling13401.4541.0Versatec15901.5057.0Versatec17831.5455.0Versatec28021.7323.0Exploradrill28041.5454.0Versatec29041.7128.0Exploradrill29731.7226.0Exploradrill29951.7327.0Exploradrill34481.7331.0Exploradrill39101.7636.0Exploradrill39491.8344.0Exploradrill42301.5440.0Versatec42301.8345.0Exploradrill