16/3-8 S
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Generell informasjon
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Brønnhistorie
GeneralWell 16/3-8 S was drilled on the Avaldsnes High, in the Eastern part of the Johan Sverdrup Field in the North Sea. The well has a crestal position on this part of the Johan Sverdrup structure. The primary objective was to investigate the reservoir properties of the Zechstein Carbonates, including a designed DST for this purpose. A secondary objective was to determine the presence, thickness and quality of the Late Jurassic Intra Draupne Formation sandstones at this location.Operations and resultsAppraisal well 16/3-8 S was spudded with the semi-submersible installation Bredford Dolphin on 1 January 2014 and drilled to TD at 2109 m in the Permian Rotliegend Group. No significant problem was encountered in the operations. The well was drilled with spud mud down to 607 m and Aquadrill mud from 607 m to TD.A six-meter thick interval of tight Draupne shale was encountered before entering the Volgian Intra Draupne Formation sandstone reservoir at 1964 m (1897 m TVD). The reservoir section consists of 13 meters of Draupne sandstone with excellent reservoir quality and 66 meters of Zechstein carbonates with variable reservoir quality. The carbonate sequence consists of limestone with limited reservoir quality in the upper part and dolomites with moderate to good reservoir quality in the lower part. The reservoir contained a 53 m TVD oil column. The oil/water contact is interpreted at 2021 m (1950 m TVD) based on the interception of the water gradient and the oil gradient from pressure measurements. Oil shows are described throughout the oil-bearing reservoir and down to a depth of 2035.6 m in the dolomitic limestones.Four cores were cut in succession from 1965 m in the Draupne Formation, through the Intra Draupne Formation Sandstone and the Smith Bank Formation and down to 2035.6 m in the Zechstein Group carbonates. Recovery was good, between 97.2 and 100%. RCX fluid samples were taken at 1965.6 m (oil), 1977.7 m (oil), 2019.5 m (water and oil), and 2037.8 m (water). Single stage separation to ambient conditions gave a GOR of ca 41 Sm3/Sm3 and an oil density of ca 0.894 g/cm3 for both of the two oil samples.The well was plugged back and prepared for sidetracking on 16 March 2014. It is classified as an oil appraisal well.TestingOne production test was performed. The interval 1964.1 - 1979.2 m was perforated and tested. In the main flow, the test produced 803 Sm3 oil and 18900 Sm3 gas through a 52/64" choke. The GOR was 23.5 Sm3/Sm3, the oil gravity was 0.89 g/cm3, and the gas gravity was 0.79 (air = 1). The maximum DST temperature was 82.5 °C. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]600.002109.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11965.01981.3[m ]21981.52008.3[m ]32008.32021.6[m ]42022.02035.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]69.9Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1418338609469461014139414211421145014661550157015701578164117671795183418341921193519591959196519781978199320582060 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01964197920.6Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.0779 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]DSL ORIT STAR UXPL19132103FLEX MREX19132107GR CCL SBT VDL17992009GR CN ZDL ORIT XMAC RTEX MLL19012107GR GEW20273031GR MAXCOR20272056GR RCX SENTINEL19652058GR RCX SP RSPS20192035MWD LWD - ASS ZT OT2 CCN ST6021916MWD LWD - OT ST141607MWD LWD - ZTG OT19131965ZTG OT ARD2.6 CCN ST19652106 -
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 formasjonstestCONDUCTOR30219.736222.00.00SURF.COND.20595.026602.01.75FITPILOT HOLE610.09 7/8610.00.00PROD.9 5/81912.612 1/41920.01.79LOTLINER72107.68 1/22109.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4421.4023.0Brine6021.3520.0Water Based17411.1614.0Water Based17601.1515.0Water Based19201.4023.0Water Based19201.4125.0Water Based19651.1517.0Water Based20081.1718.0Water Based21091.151.0Brine