6406/12-3 S
Export: PDF
-
General information
-
Wellbore history
GeneralThe 6406/12-3 S, 6406/12-3 A, and 6406/12-3 B wellbores were drilled in concert on the Pil and Bue prospects in the southern end of the Halten Terrace in the Norwegian Sea. The 6406/12-3 S was the first well to be drilled. It was designed to test a seismic data anomaly and a flat spot recognised in the Pil prospect, at Late Jurassic level.Operations and resultsWildcat well 6406/12-3 S was spudded with the semi-submersible installation Transocean Arctic on 21 January 2014 and drilled to TD at 4001 m (3762 m TVD) in the Late Jurassic Melke Formation. A 9 7/8" pilot hole was drilled from 418 to 1246 to check for shallow gas. No shallow gas was seen. Due to deteriorating hole conditions in the 8 1/2" section it was decided to set 7" liner early, at 3839 m, and continue the well as an unplanned 6" hole to TD. Otherwise, no significant problem was encountered in the operations. The well was drilled with seawater and sweeps down to 1246 m and with XP-07 oil based mud from 1246 m to TD.Contrary to prognosis, there were no Rogn Formation sandstones in the well. Instead, the well encountered Intra Melke Formation sandstones at 3514 m (3276.5 m TVD). These sandstones had good to excellent reservoir quality and contained a 227 m TVD gross hydrocarbon column. The hydrocarbons in the reservoir zone consisted of a 93 TVD m thick gas cap overlying a 134 TVD m oil leg in. The GOC is located at 3608 m (3370 m TVD) and the OWC at 3742 m (3504 m TVD). Pressure data indicated a single gas gradient over an oil leg. Below the OWC, the well penetrated a further thick high net to gross reservoir package of Intra Melke sandstones with a continuous water gradient.Five 54 m consecutive cores were cut in the interval 3524 to 3732 m with 100% overall recovery. RCX fluid samples were taken at 3579.1 m (gas), 3620.3 m (oil), 3641.7 m (oil) and 3758.5 m (water).The well was permanently abandoned on 26 April 2014 as an oil and gas discovery.TestingOne Drill Stem Test was conducted from perforations in the interval 3637.3 to 3724.5 m. The test produced oil at a rate of 1017 Sm3/day through a 56/64" choke. The GOR was 160 Sm3/Sm3 and the measured oil density was 0.850g/cm3 (36 °API). -
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]1250.003999.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13524.03578.2[m ]23578.03632.3[m ]33632.33669.3[m ]43669.33724.3[m ]53724.33733.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]209.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3483481091123012301920192020312235223523182573331233123505351435143912 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03637372522.2Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.010170.845160 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]LWD - GR RES DEN PWD DIR NPOR SO34503839LWD - GR RES PWD DEN POR SON22603450LWD - GR RES PWD DIR1418LWD - GR RES PWD DIR TT38394001MREX35003820MREX38383965PS35173777PS38413900SBT32963425SLAM3483820SLAM38383900SWC34863507VSP11553990 -
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 typeCONDUCTOR30414.736418.00.00SURF.COND.201238.6261246.01.70FITINTERM.13 3/82265.217 1/22271.01.87FITPROD.9 5/83442.412 1/43450.01.98LOTLINER73838.08 1/23839.00.00OPEN HOLE4001.064001.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4181.3414.0KCL Polymer displacement mud4541.0518.0High Viscosity Bentonite Mud4601.3414.0KCL Polymer displacement mud4841.0518.0High Viscosity Bentonite Mud9161.3414.0KCL Polymer displacement mud9641.0518.0High Viscosity Bentonite Mud9801.3414.0KCL Polymer displacement mud9851.6353.0Yellow XP-0710501.0518.0High Viscosity Bentonite Mud11801.4930.0Yellow XP-0712461.4629.0YELLOW XP-07 LOW ECD12461.02KCL Polymer displacement mud12461.4629.0YELLOW XP-07 LOW ECD12521.4918.0Yellow XP-0712801.6353.0Yellow XP-0721951.6140.0YELLOW XP-07 LOW ECD23791.6142.0XP O71.6231761.6539.0Yellow XP-0732331.6540.0YELLOW XP-07 LOW ECD34501.7345.0XP O734501.6536.0YELLOW XP-07 LOW ECD35061.7341.0YELLOW XP-07 LOW ECD36321.7340.0XP O737381.6536.0Yellow XP-0737381.34CaBr Brine37651.7341.0XP-0738391.6127.0YELLOW XP-07 LOW ECD38391.7341.0YELLOW XP-07 LOW ECD40011.6130.0Yellow XP-07