- General information
Wellbore name
6407/6-7 S
Type
EXPLORATION
Purpose
WILDCAT
Status
P&A
Press release
Factmaps in new window
Main area
NORWEGIAN SEA
Discovery
Well name
6407/6-7
Seismic location
ST04m8-inline 2154 and crossline 2680
Drilled in production licence
Drilling operator
StatoilHydro Petroleum AS
Drill permit
1243-L
Drilling facility
Drilling days
46
Entered date
12.04.2009
Completed date
27.05.2009
Release date
27.05.2011
Publication date
27.05.2011
Purpose - planned
WILDCAT
Reentry
NO
Content
GAS
Discovery wellbore
YES
1st level with HC, age
LATE JURASSIC
1st level with HC, formation
ROGN FM
2nd level with HC, age
MIDDLE JURASSIC
2nd level with HC, formation
GARN FM
Kelly bushing elevation [m]
22.0
Water depth [m]
247.0
Total depth (MD) [m RKB]
3227.0
Final vertical depth (TVD) [m RKB]
3184.0
Maximum inclination [°]
15.8
Bottom hole temperature [°C]
127
Oldest penetrated age
EARLY JURASSIC
Oldest penetrated formation
ÅRE FM
Geodetic datum
ED50
NS degrees
64° 33' 53'' N
EW degrees
7° 40' 26.7'' E
NS UTM [m]
7160787.20
EW UTM [m]
436458.94
UTM zone
32
NPDID wellbore
6100
 
 
- Wellbore history
General
The 6407/6-7 S Harepus well was drilled on the eastern limits of the Halten Terrace, adjacent to the Trøndelag Platform offshore Mid Norway. The main objective was to prove hydrocarbon bearing sands in the Middle Jurassic Garn and Ile Formations (Fangst Group). Secondary objectives were to test the hydrocarbon potential of the Ror, Tilje and Åre Formations.
Operations and results
Well 6407/6-U-2 (pilot hole) was spudded and drilled to a total depth of 437 m. A drill break and a drop in gamma measurements indicated a sand layer from 436 - 437 m. Shallow gas was observed at seabed surface by ROV sonar during the connection at 437 m. The well was killed with 1.60 SG kill mud and plugged back to surface with three cement plugs.
Wildcat well 6407/6-7 S was spudded with the semi-submersible installation Ocean Vanguard on 12 April 2009 and drilled to TD at 3227 m (3184 m TVD) in the Early Jurassic Åre Formation. The well was designed as a vertical well down to ca 1710 m in the 12 1/4" hole section and directionally drilled from the 12 1/4" section to hit the geological target at a 15 deg angle, holding this inclination to TD. No shallow gas was observed while drilling the 36" and 17 1/2" hole sections. The well was drilled with Seawater and hi-vis sweeps down to 422 m, with 1.15 SG WB spud mud from 422 m to 1149 m, with Performadril HPWBM mud from 1149 m to 2701 m, and with Performadril mud from 2701 m to TD.
The well penetrated rocks of Quaternary, Tertiary, Cretaceous, and Jurassic age. TD of the well was in the Åre Formation. Base Cretaceous/Top Spekk Formation was encountered at 2685 m with Late Jurassic Rogn Formation sandstone coming in at 2747 m (2716.2 m TVD) and a second Spekk Formation interval at 2765.7 m (2734.3 m TVD). Eroded Middle Jurassic Garn formation was encountered at 2777.3 m (2745.6 m TVD, 40 m deeper than predicted. Gas with condensate was proved in the Rogn and Garn Formations with a gas down to (GDT) proven in the Garn formation. The Garn formation pressure was 28 bar depleted and the pressure plots could not be used to determine gas-water-contact (GWC). From pressure points and logs gas is seen down to 2813.4 m (2780.6 m TVD) and water up to 2827.2 m (2794.0 m TVD). No hydrocarbons were seen in the Early Jurassic Båt Group.
No oil shows were seen in the well apart from some weak cloudy bluish white cut fluorescence, and in parts, a greenish yellow residual in core chips from the reservoir section.
One core was cut from 2756.5 to 2778.8 m in the Rogn and Garn Formations. Good quality gas samples were collected with the MDT single probe equipment in the Rogn Formation at 2764 m, 2764.7 m, and 2770.8 m and in the Garn Formation at 2784.1 m. No water samples were collected due to hole conditions.
The well was permanently abandoned on 27 May 2009 as a gas discovery.
Testing
No drill stem test was performed.
 
 
- Cuttings at the NPD
Cutting sample, top depth [m]
Cutting samples, bottom depth [m]
430.00
3222.00
Cuttings available for sampling?
YES
 
 
- Cores at the NPD
Core sample number
Core sample - top depth
Core sample - bottom depth
Core sample depth - uom
1
2756.5
2778.8
[m ]
Total core sample length [m]
22.3
Cores available for sampling?
YES
 
 
- Lithostratigraphy
 
 
- Logs
Log type
Log top depth [m]
Log bottom depth [m]
FMI MSIP
2700
3220
MDT PRETEST
2751
3139
MDT PS PA MINI-DST
0
0
MDT PS SAMPLING
2764
2784
MWD - PP ARCVRES6 GR RES PWD DIR
1149
3227
MWD - PP ARCVRES9 GR RES PW
321
1149
MWD - PP DIR
269
321
PEX HRLA ECS CMR
2700
3227
VSP
328
3220
 
 
- Casing and leak-off tests
Casing type
Casing diam.
[inch]
Casing depth
[m]
Hole diam.
[inch]
Hole depth
[m]
LOT mud eqv.
[g/cm3]
Formation test type
CONDUCTOR
30
317.0
36
317.0
0.00
LOT
SURF.COND.
20
418.0
26
422.0
1.27
LOT
PILOT HOLE
437.0
9 7/8
437.0
0.00
LOT
INTERM.
13 3/8
1144.0
17 1/2
1149.0
1.76
LOT
INTERM.
9 5/8
2700.0
12 1/4
2701.0
1.86
LOT
OPEN HOLE
3227.0
8 1/2
3227.0
0.00
LOT
 
 
 
- Drilling mud
Depth MD [m]
Mud weight [g/cm3]
Visc. [mPa.s]
Yield point [Pa]
Mud type
Date measured
547
1.15
10.0
 
Spud Mud
 
649
1.17
9.0
 
Spud Mud
 
850
1.17
9.0
 
Spud Mud
 
965
1.14
9.0
 
Spud Mud
 
1149
1.24
8.0
 
HPWBM
 
1310
1.45
27.0
 
HPWBM
 
1884
1.52
38.0
 
HPWBM
 
2052
1.51
37.0
 
HPWBM
 
2192
1.51
34.0
 
HPWBM
 
2626
1.51
43.0
 
HPWBM
 
2698
1.27
19.0
 
HPWBM
 
2756
1.26
24.0
 
HPWBM
 
3215
1.25
25.0
 
HPWBM
 
3227
1.25
25.0
 
HPWBM