- General information
Wellbore name
6605/8-1
Type
EXPLORATION
Purpose
WILDCAT
Status
P&A
Press release
Factmaps in new window
Main area
NORWEGIAN SEA
Discovery
Well name
6605/8-1
Seismic location
inline NH0202 &4436crossline NH0202-5031
Drilled in production licence
Drilling operator
Norsk Hydro Produksjon AS
Drill permit
1083-L
Drilling facility
Drilling days
131
Entered date
14.06.2005
Completed date
22.10.2005
Release date
22.10.2007
Publication date
08.11.2007
Purpose - planned
WILDCAT
Reentry
NO
Content
GAS
Discovery wellbore
YES
1st level with HC, age
LATE CRETACEOUS
1st level with HC, formation
NISE FM
2nd level with HC, age
LATE CRETACEOUS
2nd level with HC, formation
LYSING FM
Kelly bushing elevation [m]
23.5
Water depth [m]
838.0
Total depth (MD) [m RKB]
4513.0
Final vertical depth (TVD) [m RKB]
4508.0
Maximum inclination [°]
10.4
Bottom hole temperature [°C]
158
Oldest penetrated age
LATE CRETACEOUS
Oldest penetrated formation
LANGE FM
Geodetic datum
ED50
NS degrees
66° 21' 51.93'' N
EW degrees
5° 34' 39.23'' E
NS UTM [m]
7363094.51
EW UTM [m]
615294.53
UTM zone
31
NPDID wellbore
4984
 
 
- Wellbore history
Well 6605/8-1 is an exploration well on a Late Cretaceous Lysing Prospect situated on the western flank of the Fles North rotated fault block structure in the Vøring Basin outside Mid Norway. The primary objective was to test the presence of movable hydrocarbons in the Lysing prospect. A secondary objective was to investigate the reservoir potential of the Nise Formation
Operations and results
Wildcat well 6605/8-1 was spudded in 838 m water depth with the semi-submersible installation Transocean Leader on 14 June 2005 and drilled to TD at 4513 m in Late Turonian sediments of the Lange Formation. Operations went without significant technical problems. No shallow gas or shallow water flow was observed. The well was drilled with spud mud down to 2500 m and with KCl/Polymer/Glydril mud from 2500 m to TD.
The well penetrated the main target at 4184 m, a 70 m thick Lysing Formation deep-water turbidite sand of Early Coniacian age. Gas was recorded from 4180 m. There were two gas zones separated by a water zone. The upper zone had gas down to a free water level inferred at 4221 m (4193 m TVD MSL). The lower gas zone, at 4253 m, was very thin and was approximately 20 bar overpressured compared to the upper zone. Gas shows were also encountered in Early Campanian Nise siltstone at 3064 m and a deeper Lysing sandstone unit at 4354 m.
One 9 m long core was taken in the interval 4190-4199 m in the upper Lysing reservoir. It contained sandstones interbedded with thin mudstone layers. MDT fluid samples were taken at 4230.55 m (water), 4231.4 m (water), 4209.4 m (gas), 4211.86m (gas), and at 4253.5 m (gas which gave a dark brown/black liquid when flashed). Temperature at seabed was measured to -1.5 deg C. An MDT run in cased hole after the DST and almost 3 weeks after the last mud circulation gave a maximum temperature of 146 deg C at 4230 m. This was believed to be close to the true formation temperature. From this an average temperature gradient of 4.37 deg C/100 m and a temperature of 158 deg C at total depth was estimated.
The well was permanently abandoned 22 October 2005 as a gas discovery.
Testing
A drill stem test was performed over the interval 4184-4211.5 m in the upper Lysing reservoir with a flow rate of approximately 100 000 Sm3/d on a 1 inch choke. The gas/condensate ratio was 230000 Sm3/Sm3. The gas contained 4 - 5 ppm H2S and 6.5 % CO2. The pressure drawdown in the test was up to 530 bar. This resulted in large gas expansion and subsequent cooling in the well stream. The temperature recording during the test, 116 deg C towards the end of the main flow, was thus considered as not representative for the formation.
 
 
- Cuttings at the NPD
Cutting sample, top depth [m]
Cutting samples, bottom depth [m]
2005.00
4513.00
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
4190.0
4199.0
[m ]
Total core sample length [m]
9.0
Cores available for sampling?
YES
 
 
- Palynological slides at the NPD
Sample depth
Depth unit
Sample type
Laboratory
4190.1
[m]
C
OD
4191.0
[m]
C
OD
4192.3
[m]
C
OD
4192.9
[m]
C
OD
4193.7
[m]
C
OD
4194.4
[m]
C
OD
4195.4
[m]
C
OD
4196.2
[m]
C
OD
4196.3
[m]
C
OD
4197.1
[m]
C
OD
4197.8
[m]
C
OD
4198.6
[m]
C
OD
 
 
- Oil samples at the NPD
Test type
Bottle number
Top depth
MD [m]
Bottom depth
MD [m]
Fluid type
Test time
Samples available
0.00
0.00
CONDENSATE
22.09.2005 - 20:00
YES
DST
0.00
0.00
 
YES
 
 
- Lithostratigraphy
 
 
- Composite logs
Document name
Document format
Document size [KB]
pdf
0.65
 
 
- Geochemical information
Document name
Document format
Document size [KB]
txt
0.00
txt
0.03
xls
0.07
 
 
- Drill stem tests (DST)
Test number
From depth MD
[m]
To depth MD
[m]
Choke size
[mm]
1.0
4184
4211
25.4
Test number
Final shut-in pressure
[MPa]
Final flow pressure
[MPa]
Bottom hole pressure
[MPa]
Downhole temperature
[°C]
1.0
    
Test number
Oil
[Sm3/day]
Gas
[Sm3/day]
Oil density
[g/cm3]
Gas grav. rel.air
GOR
[m3/m3]
1.0
2
100000
  
230000
 
 
- Logs
Log type
Log top depth [m]
Log bottom depth [m]
CBL
2825
4013
CBL
4020
4405
FMI
4100
4514
HSD
4230
4230
MDT DP PS-1MS-1SC
4230
4230
MDT DP PS-1MS-2SC
4191
4211
MDT DP PS-2MS
4244
4428
MDT PS-PG
4246
4252
MDT PS-PG-2MS-2SC
4191
4237
MDT PS-PG-2MS-2SC
4238
4246
MSCT
4148
4438
MWD LWD - ARC DIR ADN ISONIC
957
2000
MWD LWD - ARC DIR ISONIC
2900
4100
MWD LWD - DIR
862
957
MWD LWD - GVR ARC DIR ISONIC
4100
4513
MWD LWD - RAB ARC DIR ISONIC
2005
2900
PEX HRLA ECS DSI
1998
4514
VSP
2710
4510
 
 
- 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
955.0
36
957.0
0.00
LOT
SURF.COND.
20
1999.0
26
2000.0
1.44
LOT
INTERM.
13 3/8
2887.0
17 1/2
2900.0
1.62
LOT
INTERM.
9 5/8
4099.0
12 1/4
4100.0
1.94
LOT
OPEN HOLE
4513.0
8 1/2
4513.0
1.76
LOT