35/9-11 A
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General information
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Wellbore history
GeneralWell 35/9-11 A is a sidetrack to well 35/9-11 S. The well bores were drilled on the northern tip of the Ryggsteinen Ridge, west of the Gjøa Field. The two well bores had the same general objective: to appraise the 35/9-6 Titan Discovery. The 35/9-11 S well verified the Titan discovery. This initiated 35/9-11 A to perform data acquisition including coring, pressure measurement and fluid sampling.Operations and resultsAppraisal well 35/9-11 A was kicked off at 3065 m in 35/9-11 S on 15 April 2014. It was drilled with the semi-submersible installation Leiv Eiriksson to TD at 3860 m in the Early Jurassic Statfjord Group. The sidetrack well was drilled parallel to the primary well bore at a distance ca 25 m from the primary well bore. No significant problem was encountered in the operations. The well was drilled with Glydril mud from kick-off to TD.A 21 m thick sequence of Callovian sandstones was penetrated from 3270 m to 3291. These sandstones were absent in 33/9-11 S, just 25 m away. The rest of the Jurassic reservoir targets were also present in well 35/9-11 A. According to the petrophysical evaluation, hydrocarbons were proven in six different stratigraphic levels (Callovian-, Tarbert-, Etive-, Cook-, Johansen- and Statfjord-Formation).The data acquisition in 35/9-11 A included MWD/LWD, 11 wireline runs including formation pressure/fluid sampling and 5 coring runs with a total recovery 83.6 m. Three cores were cut in the Tarbert Formation from 3440 to 3454 m; these should be shifted + 3.0 m to match the wire line logs. One core was cut in the Etive/Rannoch formations from 3497 to 3527 m; this core should be shifted +2.9 m to match the logs. One core was cut in in the Cook Formation from 3625 to 3667 m; this core should be shifted + 3.8 m to match the logs. The fluid samples were taken at 3272.5 m (oil with GOR ~250 Sm3/Sm3), 3469.5 m (oil with GOR ~500 Sm3/Sm3), 3495 m (oil with GOR ~600 Sm3/Sm3), 3637.8 m (oil with oil with GOR ~300 Sm3/Sm3), 3692.2 m (water), 3820.48 (mud), and 3822.2 m (water and mud).The well was permanently abandoned on 21 May 2014 as an oil and gas appraisal well.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]3030.003857.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13440.03444.7[m ]23445.53449.6[m ]33450.53453.5[m ]43497.03526.6[m ]53625.03666.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]82.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableMDT3495.000.00WATER02.05.2014 - 00:00YESMDT3637.800.00OIL02.05.2014 - 00:00YESMDT3272.500.00OIL02.05.2014 - 00:00YESMDT3637.800.00OIL02.05.2014 - 00:00YES -
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 typeOPEN HOLE3860.08 1/23860.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR XPT31563856FMI MSIP29023856HRLA TLD APS MCFL HNGS29023857MDT32723495MDT36373822MDT36933693MSCT32723449MWD LWD - DI GR392462MWD LWD - GR RES DI PWD462785MWD LWD - GR RES DI PWD SON7851757MWD LWD - GR RES NEU DEN DI SON17573800MWD LWD - NBGR GR RES DEN DI PWD30653860MWL LWD - GR RES NEU DEN SON DI462785MWL LWD - NBGR RES DI PWD SON785785VSP15373854XLR28323449XLR32733604XPT ADT32483863 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit39356357560560576583496510181222125312531299134016341704170418542800294529702981298130653082309831633163327132923441344134703492352335573557362437013709375337823801 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured26311.3517.0Glydril30721.3418.0Glydril34401.3516.0Glydril35701.3515.0Glydril36671.3518.0Glydril38591.3516.0Glydril38591.3617.0Glydril