- General information
Wellbore name
7120/10-2
Type
EXPLORATION
Purpose
WILDCAT
Status
P&A
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Main area
BARENTS SEA
Well name
7120/10-2
Seismic location
E 841 - 09 SP. 295
Drilled in production licence
Drilling operator
Esso Exploration and Production Norway A/S
Drill permit
643-L
Drilling facility
Drilling days
48
Entered date
20.07.1990
Completed date
05.09.1990
Release date
05.09.1992
Publication date
11.02.2005
Purpose - planned
WILDCAT
Reentry
NO
Content
DRY
Discovery wellbore
NO
Kelly bushing elevation [m]
25.0
Water depth [m]
186.0
Total depth (MD) [m RKB]
2500.0
Final vertical depth (TVD) [m RKB]
2497.0
Maximum inclination [°]
7.5
Bottom hole temperature [°C]
63
Oldest penetrated age
LATE JURASSIC
Oldest penetrated formation
HEKKINGEN FM
Geodetic datum
ED50
NS degrees
71° 5' 34.8'' N
EW degrees
20° 14' 28.31'' E
NS UTM [m]
7888153.58
EW UTM [m]
472556.90
UTM zone
34
NPDID wellbore
1561
 
 
- Wellbore history
General
Block 7120/10 is situated on the southwest margin of the Hammerfest Basin with the Tromsø Basin to the west, and the Troms-Finnmark Platform to the south. Well 7120/10-2 was designed to drill Valanginian submarine fan sandstones, where the hydrocarbon trap is formed by up dip sand pinch out to the south and west combined with structural dip to the northeast. The reservoir was prognosed to be penetrated at 2080 m sub sea. The source kitchen for the prospect was expected to be the Hekkingen Formation of Late Jurassic, which is good to rich source rocks and contains oil prone kerogen. Surface to 214 m subsea could contain boulders and thus cause drilling problems.
Operations and results
Wildcat well 7120/10-2 was spudded with the semi-submersible installation Byford Dolphin on 20 July 1990 and drilled to TD at 2500 m in the Late Jurassic Hekkingen Formation. Three incidents delayed the drilling for a total of 13.5 days: 1) A boulder bed in the 36" section made it necessary to make a trip to change the BHA. The old hole could not be located on this wiper trip so the string was pulled to re-spud; 2) A wellhead connector leak needed to be diagnosed and repaired; 3) Logs hung up at ledges formed when the shale/ claystone was washed out while resistant limestone were not. As a consequence of the latter no wire line logs were obtained over the interval 2106 m to 1935 m. This interval comprises predominantly shale but does include two sandstone beds (2052 m to 2059 m and 2036 m to 2038 m). The well was drilled with seawater down to 523 m and with lignosulphonate/seawater/gel from 523 m to TD.
The well penetrated the primary objective, Valanginian sandstones, at 2125 m within the Knurr Formation. These reservoir quality rocks comprised of sandstones with minor interbedded siltstones and shales for a thickness of 178 m down to the contact with the Late Jurassic Hekkingen Shale at 2303 m. These reservoir sands all proved water wet. The well penetrated 197 m of Late Jurassic source rock of variable richness. No truly "hot" shale was penetrated, although the Hekkingen Formation did contain organic rich material and showed a significant gas increase with moderately bright cut and crush cut fluorescence throughout. One core was cut in the interval from 2127 to 2136 m. The core was cut close to the top of the sand-prone section. No fluid sample was taken.
The well was permanently abandoned as a dry hole on 5 September 1990.
Testing
No drill stem test was performed
 
 
- Cuttings at the NPD
Cutting sample, top depth [m]
Cutting samples, bottom depth [m]
540.00
2500.00
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
2127.0
2135.6
[m ]
Total core sample length [m]
8.6
Cores available for sampling?
YES
 
 
- Core photos
Click to enlarge the pictureClick to enlarge the pictureClick to enlarge the pictureClick to enlarge the pictureClick to enlarge the picture
2127-2132m
2127-2132m
2132-2136m
2132-2135m
 
     
 
 
- Palynological slides at the NPD
Sample depth
Depth unit
Sample type
Laboratory
647.0
[m]
SWC
ESSO
708.0
[m]
SWC
ESSO
728.0
[m]
SWC
ESSO
754.0
[m]
SWC
ESSO
758.0
[m]
SWC
ESSO
797.0
[m]
SWC
ESSO
824.0
[m]
SWC
ESSO
854.0
[m]
SWC
ESSO
864.0
[m]
SWC
ESSO
891.0
[m]
SWC
ESSO
918.0
[m]
SWC
ESSO
941.0
[m]
SWC
ESSO
1000.0
[m]
SWC
ESSO
1047.0
[m]
SWC
ESSO
1088.0
[m]
SWC
ESSO
1126.0
[m]
SWC
ESSO
1175.0
[m]
SWC
ESSO
1191.0
[m]
SWC
ESSO
1217.0
[m]
SWC
ESSO
1268.0
[m]
SWC
ESSO
1286.0
[m]
SWC
ESSO
2128.5
[m]
C
ESSO
2130.6
[m]
C
ESSO
2132.1
[m]
C
ESSO
2134.0
[m]
C
ESSO
2135.0
[m]
C
ESSO
2135.4
[m]
C
ESSO
 
 
- Lithostratigraphy
 
 
- Composite logs
Document name
Document format
Document size [KB]
pdf
0.34
 
 
- Documents - older NPD WDSS reports and other related documents
 
 
- Documents - reported by the production licence (period for duty of secrecy expired)
Document name
Document format
Document size [KB]
pdf
1.25
pdf
41.58
 
 
- Logs
Log type
Log top depth [m]
Log bottom depth [m]
CBL VDL GR
685
1321
DIL GR CAL SP FGT CNL
2106
2493
DIL GR LSS SP CAL
521
1313
DIL GR LSS SP CAL
1312
1878
DIL GR LSS SP CAL
1837
1935
LDL CNL GR CAL
1312
1878
LDL CNL GR CAL
1837
1935
MWD
249
2500
SWC
551
1286
VELOCITY
375
1930
 
 
- 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
248.0
36
250.0
0.00
LOT
INTERM.
13 3/8
523.0
17 1/2
533.0
1.86
LOT
INTERM.
9 5/8
1311.0
12 1/4
1321.0
1.85
LOT
OPEN HOLE
2500.0
8 1/2
2500.0
0.00
LOT
 
 
 
- Drilling mud
Depth MD [m]
Mud weight [g/cm3]
Visc. [mPa.s]
Yield point [Pa]
Mud type
Date measured
224
1.03
1.0
 
WATER BASED
23.07.1990
249
1.03
1.0
 
WATER BASED
25.07.1990
249
1.03
1.0
 
WATER BASED
23.07.1990
249
1.03
1.0
 
WATER BASED
24.07.1990
249
1.00
  
WATER BASED
23.07.1990
536
1.03
1.0
 
WATER BASED
26.07.1990
536
1.07
13.0
3.4
WATER BASED
30.07.1990
536
1.03
  
WATER BASED
30.07.1990
536
1.07
7.0
5.3
WATER BASED
30.07.1990
685
1.08
5.0
5.7
WATER BASED
31.07.1990
1014
1.13
8.0
6.7
WATER BASED
01.08.1990
1190
1.25
15.0
0.5
WATER BASED
03.09.1990
1300
1.25
15.0
1.9
WATER BASED
03.09.1990
1321
1.15
7.0
8.1
WATER BASED
03.08.1990
1321
1.21
12.0
6.7
WATER BASED
09.08.1990
1321
1.21
12.0
6.7
WATER BASED
13.08.1990
1321
1.21
12.0
6.7
WATER BASED
14.08.1990
1321
1.15
7.0
8.1
WATER BASED
02.08.1990
1321
1.15
10.0
9.1
WATER BASED
06.08.1990
1321
1.16
7.0
8.1
WATER BASED
06.08.1990
1321
1.16
9.0
7.7
WATER BASED
06.08.1990
1321
1.21
12.0
6.7
WATER BASED
10.08.1990
1321
1.21
12.0
6.7
WATER BASED
13.08.1990
1454
1.17
10.0
7.7
WATER BASED
15.08.1990
1670
1.18
11.0
9.6
WATER BASED
15.08.1990
1865
1.16
10.0
7.7
WATER BASED
16.08.1990
1886
1.18
10.0
6.7
WATER BASED
17.08.1990
2076
1.23
14.0
7.7
WATER BASED
21.08.1990
2086
1.23
12.0
8.6
WATER BASED
21.08.1990
2127
1.23
12.0
7.7
WATER BASED
21.08.1990
2136
1.23
11.0
7.2
WATER BASED
21.08.1990
2195
1.23
15.0
7.2
WATER BASED
22.08.1990
2500
1.20
12.0
7.2
WATER BASED
27.08.1990
2500
1.26
17.0
8.1
WATER BASED
27.08.1990
2500
1.26
15.0
6.7
WATER BASED
27.08.1990
2500
1.26
13.0
6.7
WATER BASED
28.08.1990
2500
1.26
15.0
6.7
WATER BASED
29.08.1990
2500
1.26
11.0
5.3
WATER BASED
30.08.1990
2500
1.27
12.0
4.8
WATER BASED
31.08.1990
2500
1.26
14.0
4.8
WATER BASED
03.09.1990