General information Attribute ValueWellbore name6406/3-6TypeEXPLORATIONPurposeAPPRAISALStatusP&APress releaseFactmaps in new windowMain areaNORWEGIAN SEAFieldDiscoveryWell name6406/3-6Seismic locationinline 484 & x-line 927: ST9503R99Production licenceDrilling operatorStatoil ASA (old)Drill permit1040-LDrilling facilityDrilling days56Entered date21.09.2002Completed date15.11.2002Release date15.11.2004Publication date01.12.2004Purpose - plannedAPPRAISALReentryNOContentOIL/GASDiscovery wellboreNO1st level with HC, ageMIDDLE JURASSIC1st level with HC, formationGARN FM2nd level with HC, ageMIDDLE JURASSIC2nd level with HC, formationILE FMKelly bushing elevation [m]24.0Water depth [m]273.0Total depth (MD) [m RKB]4175.0Final vertical depth (TVD) [m RKB]4174.0Maximum inclination [°]3.7Bottom hole temperature [°C]151Oldest penetrated ageEARLY JURASSICOldest penetrated formationTILJE FMGeodetic datumED50NS degrees64° 47' 43.56'' NEW degrees6° 57' 55.17'' ENS UTM [m]7187388.89EW UTM [m]403326.40UTM zone32NPDID wellbore4589
Wellbore historyGeneralWell 6406/3-6 is located on the Halten Terrace on the western part of the Tyrihans Sør structure. The overall goal for the well was to appraise the Tyrihans Sør Discovery. The main objectives were to sample formation fluid from Tyrihans Sør in order to determine the hydrocarbon phase and to identify any possible erosion in the western part of the Discovery.OperationsAppraisal well 6406/3-6 was spudded with the semi-submersible installation Stena Don on 21 October 2001. The rig drilled to a TD of 4175 m in the Jurassic Tilje Formation. The well was drilled in a water depth of 273 m, with RKB at 24 m. The well was drilled with seawater and hi-vis sweeps down to 1780 m and with Versavert oil based mud through the 12 1/4" and 8 1/2" sections from1780 m to 3654.5 m, 4.5 m into the Garn Formation. The subsequent 6" section to TD was drilled with KCl / glycol / low sulphate water-based mud (Glydril).The well penetrated mainly mudstones above the Jurasssic Fangst Group with siltstone intervals in the Nise and Kvitnos Formations. No shows were reported above the Fangst Group. A thick Garn Formation was found, with no trace of erosion. Hydrocarbons were found in the Garn Formation with oil-water contact at 3683 m TVD MSL, and in the upper part of the Ile Formation with oil-water contact at 3825 m TVD MSL. Good shows were recorded in the Garn and Ile Formations down to 3840 m. Due to problems with real-time data mainly memory data were available from MWD in the 8-1/2" section. Both LWD real time runs failed in the 6" section. However, wire line logging covered most of the 6" section. Recovery of sidewall cores was excellent. VSP with P+S mode sonic was gathered in the Garn Formation, and several runs were performed with MDT, collecting samples from Garn, Ile and Tilje (water) Formations. A number of pressure data points gave good correlation for gas and fluid contacts. No conventional cores were cut. The well was completed on 15 November 2002, permanently plugged and abandoned as an oil and gas appraisal.TestingNo drill stem test was performed
Cuttings at the NPD
Cuttings at the NPDCuttings available for sampling?YES Cuttings at the NPDCutting sample, top depth [m]Cutting samples, bottom depth [m]1790.004175.00
Palynological slides at the NPD
LithostratigraphyTop depth [m]Lithostrat. unit297297142118651865223522352304237123712490280630953095312435483577357735943650365037673805388938894041
Composite logsDocument nameDocument formatDocument size [KB]0.38
LogsLog typeLog top depth [m]Log bottom depth [m]HRLA DSI IPLT33803864HRLA IPLT37604175MDT GR36563752MDT GR36563752MDT GR36683668MDT GR36753719MDT GR36853685MDT GR36923707MDT GR36943694MDT GR36943694MDT GR38073833MDT GR38434157MSCT36553833MWD LWD - EWR-P4 DGR SLD CNT38674175MWD LWD - MPR3593867VSP - ASI GR3403775
Casing and leak–off tests
Casing and leak–off testsCasing typeCasing diam.
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30357.036459.00.00LOTSURF.COND.13 3/81773.017 1/21780.01.83LOTINTERM.9 5/82897.012 1/41903.01.85LOTINTERM.73647.08 1/23654.01.49LOTOPEN HOLE4175.064175.00.00LOT
Drilling mudDepth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4591.03sea water17801.20sea water29031.75versavert36541.66versavert41751.22glydrill
Pressure plotsThe 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 plotsDocument nameDocument formatDocument size [KB]0.22