9/2-8 S
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General information
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Wellbore history
GeneralWell 9/2-8 S was drilled from slot 3 of the Yme template. The well was planned as an exploration well, to identify the hydrocarbon potential of the Yme Epsilon East and West structures. The well design was based on flexibility to enable later completion as a production well if commercial reserves of oil were encountered. The Epsilon East and West structures are developed on the east and west sides of a salt diapir. The well was planned to drill down through the sequence on the east flank with the Sandnes Formation being the primary target. As a secondary target the well was planned to extend a further 1600 m into Epsilon West structure. This involved drilling through the base of the salt diapir and then up through the sequence within the western flank. The Epsilon East structure was recognized as a fairly well defined prospect, comprising of an eastward dipping tilted fault block. Complicated tectonism affecting the Epsilon West structure however, meant this could only have the status of a lead. The main uncertainties with respect to probability of discovery were considered as leakage/trap and source/migration.Operations and resultsWildcat well 9/2-8 S was spudded from the seabed with the jack-up installation "Mærsk Giant" on 24 June 1997. At 5936 m the BHA became stuck while drilling the Sandnes Formation. The well was subsequently sidetracked to 9/2-8S T2 from 5680 m on the 4 October 1997. The T2 sidetrack was only drilled to 6011 m due to the BHA becoming stuck at 6002 m while pulling out of hole. A further sidetrack, 9/2-8S T3, was drilled from 5628.5 m, on 19 October 1997 and reached a TD of 7203 m on 16 December 1997. This sidetrack failed to penetrate the Vestland Group, passing from Zechstein salts of the faulted zone straight into the shales of the Tau Formation. As a result a final sidetrack, 9/2-8S T4, was started from 6144 m on 21 December 1997. This wellbore reached final TD at 7584 m in the Late Jurassic Egersund formation on 18 January 1998 after penetrating the uppermost Sandnes Formation. The Sandnes Formation proved to be dry and tight. Cores were taken in the original 9/2-8S well from 5842 m to 5926 m within the Sandnes reservoir on the Epsilon East structure. Oil shows were noted, but MWD logging indicated that the formation was water wet. A FMT fluid sample was taken in 9/2-8S T4 at 7397 m (Epsilon West structure). The plan was to complete the well with a 5" liner through the reservoir section, but as both structures were water wet, cement-plugs were set in the Epsilon West. The well was completed in the Epsilon East structure on 2 February 1998 as a dry well. It was subsequently re-classified to development well 9/2-A-3 and used as an injection well for gas produced from the Yme field.TestingNo drill stem test was performed. -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom15842.05869.3[m ]25870.05876.5[m ]35876.55898.6[m ]45898.65927.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]84.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory5690.0[m]DCGEOSTR5710.0[m]DCGEOSTR5729.0[m]DCGEOSTR5752.0[m]DCGEOSTR5769.0[m]DCGEOSTR5790.0[m]DCGEOSTR5808.0[m]DCGEOSTR5829.0[m]DCGEOSTR5841.0[m]DCGEOSTR5842.6[m]CWESTL5846.6[m]CWESTL5850.0[m]DCGEOSTR5851.5[m]CWESTL5859.0[m]DCGEOSTR5859.4[m]CWESTL5863.0[m]DCGEOSTR5866.8[m]CWESTL5868.9[m]CWESTL5877.0[m]DCGEOSTR5899.5[m]CWESTL5900.8[m]CWESTL5904.5[m]CWESTL5911.8[m]CWESTL5919.0[m]CWESTL5923.6[m]CWESTL5926.8[m]CWESTL5931.0[m]DCGEOSTR5995.6[m]CWESTL -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit135540752752773810838850850886125121322257225722902572476247624995568957695823582359556023737873787420 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.52 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf22.64 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CNL ZDL HDIL MAC CHT GR73787584DGR EWR DIR2442286DGR EWR PWD DIR22866011DGR EWR PWD DIR60037378DGR EWR SLD CN DIR57006003DPIL 6-CALI MAC CHT GR22125636FMT CHT GR58365896FMT CHT GR74007394SF-4 DIR72797584 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeSURF.COND.30244.036245.00.00LOTCONDUCTOR20847.026850.00.00LOTINTERM.13 3/82281.417 1/22283.00.00LOTINTERM.9 5/85941.012 1/46011.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured591.6441.0PETROFREE1891.03SEAWATER/BENT.2471.39SEAWATER/BENT.3001.03SEAWATER/PAC4001.03SEAWATER/PAC8201.03SEAWATER/PAC8531.03DUMMY13301.3030.0SEAWATER/PAC15711.3028.0SEAWATER/PAC17401.3031.0SEAWATER/PAC17751.3032.0SEAWATER/PAC18561.3035.0SEAWATER/PAC20311.3033.0KCL/PAC/PHPA21901.03DUMMY22491.3032.0KCL/PAC/PHPA22861.3940.0KCL/PAC/PHPA22861.3940.0KCL/PAC/PHPA28401.5446.0PETROFREE32921.5449.0PETROFREE37601.5442.0PETROFREE39621.54DUMMY40211.5448.0PETROFREE43161.5444.0PETROFREE46711.5441.0PETROFREE49571.6044.0PETROFREE52741.6044.0PETROFREE53001.6045.0PETROFREE53321.6041.0PETROFREE55601.6033.0PETROFREE56671.6442.0PETROFREE56801.6442.0PETROFREE57141.6742.0PETROFREE57171.6439.0PETROFREE57301.6445.0PETROFREE57411.6436.0PETROFREE57881.6439.0PETROFREE58421.6742.0PETROFREE58541.6440.0PETROFREE58661.64DUMMY58701.6440.0PETROFREE58771.6440.0PETROFREE59361.6441.0PETROFREE59421.6035.0PETROFREE59421.6441.0PETROFREE60021.6441.0PETROFREE61781.6039.0PETROFREE62101.6036.0PETROFREE62131.6034.0PETROFREE62641.6036.0PETROFREE63001.6033.0PETROFREE63141.6033.0PETROFREE64051.6033.0PETROFREE66811.6032.0PETROFREE67701.6032.0PETROFREE68501.6033.0PETROFREE68761.6032.0PETROFREE69911.6033.0PETROFREE70821.6032.0PETROFREE71541.6035.0PETROFREE71571.6032.0PETROFREE72031.6032.0PETROFREE72031.6032.0PETROFREE72851.6033.0PETROFREE73781.6031.0PETROFREE73941.3230.0PETROFREE75841.3224.0PETROFREE75841.3230.0PETROFREE -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]PDF0.21