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Exploration wellbore: 25/10-5

General information

NPDID wellbore:	365
Well name:	25/10-5
Drilling operator name:	Esso Exploration and Production Norway A/S
Geodetic datum:	ED50
Coordinates:	59° 10` 49.24`` N	2° 19` 26.97`` E
UTM coordinates:	6560481.03 N	461373.07 E
UTM zone:	31
Drilled in production licence:	028
Area:	NORTH SEA
Discovery:	25/11-1 BALDER
Field:	BALDER
Drill permit:	291-L
Drilling facility:	GLOMAR BISCAY II
Drilling days:	33
Wellbore entry date:	15.06.1981
Wellbore completion date:	17.07.1981
Original wellbore purpose:	APPRAISAL
Wellbore purpose:	APPRAISAL
Wellbore status:	P&A
Wellbore contents:	OIL
Discovery wellbore:	NO
Formation/age with hydrocarbons 1:	INTRA BALDER FM SS / EOCENE
Seismic location:	BALMG 203 SP: 109.
Kelly bushing elevation (KB) [m]:	25
Water depth [m]:	125
Total Depth (MD) [m]:	2011
Final vertical depth (TVD) [m]:
Max inclination [°]:
Bottom hole temperature [°C]:	55
Oldest penetrated age:	LATE JURASSIC
Oldest penetrated formation:	VIKING GP
Note: All depths, except the water depth, are relative to kelly bushing (RKB)

Wellbore history

General

The 25/10-5 well was drilled to establish the presence of an accumulation of Eocene oil sand in the western part of the Balder Field, and evaluate the geologic concept of sand-shale distribution and reservoir quality.

Operations and results

Wildcat well 25/10-5 was spudded with the semi-submersible installation Glomar Biscay II on 15 June 1981 and drilled to TD at 2011 m in the Late Jurassic Viking Group. The well was drilled with sea water/gel/lignosulphonate.

The top of the Early Eocene reservoir was encountered at 1733 m (1708 m sub sea), as prognosed. The reservoir consisted of thin sandstone beds interbedded with shale and was oil bearing. A 49.5 m gross oil column was found down to an OWC at 1782.5 m. The net oil sandstone thickness was 18.2 m. Late Eocene Grid Formation sandstone was penetrated at 1398 m to 1443 m and Paleocene Heimdal Formation sandstone from 1905 m to 1929 m. These were both water wet without shows.

Four cores were cut in the Lower Eocene reservoir sequence. No wire line test or fluid sampling was carried out.

The well was permanently abandoned on 17 July 1981 as an oil appraisal well.

Testing

Two drill stem tests were performed in the Early Eocene reservoir. DST 1 perforated the interval 1756 m to 1753 m and produced 171 Sm3 oil/day. The oil gravity was 25.3 deg API and the gas/oil ratio was 59 m3/m3. DST2 perforated the intervals 1732 - 1740 m and 1756 - 1763 m. It produced 515 Sm3 oil/day. The oil gravity in DST2 was 25.5 deg API and the gas/oil ratio was 59 m3/m3.

Cuttings available at the NPD

Interval [m]: 240.00 - 2011.00

Cores available at the NPD

Core length [m]: 13.35

Core number	Interval
1	1739-1742.85
2	1776.7-1777.68
3	1781-1781.9
4	1785.2-1792.8

Scanned core photos

No scanned core photos available

Palynological slides available at the NPD

No palynological slides in this wellbore.

Oil samples available at the NPD

Test type:	Bottle test number:	Bottle interval [m]:	Fluid type:	Test date and time:
DST	DST1	1756.000 - 1763.000		1981.07.11 00:00
DST	DST2	1732.000 - 1740.000		1981.07.12 00:00

Casing and leak-off tests

Type	Casing diam. [inch]	Depth below KB [m]	Hole diam. [inch]	Hole depth below KB [m]	Lot mud eqv. [g/cm³]
CONDUCTOR	30	211.0	36	211.0
INTERM.	13 3/8	484.5	17 1/2	500.0	1.75
INTERM.	9 5/8	1345.0	12 1/4	1370.0	1.90
LINER	7	1991.0	8 1/2	2011.0

Mud

Depth MD [m]	Mud weight [g/cm³]	Mud type
500	1.07	seawater
1220	1.08	seawater
1656	1.17	seawater
2011	1.25	seawater

Drill stem test (intervals and pressures)

Test no.	Test interval [m]	Choke size [mm]	Final shut in pressure [MPa]	Final flow pressure [MPa]	Bottom hole pressure [MPa]	Downhole temperature [°C]
1.0	1756 - 1763	12.7				0
2.0	1732 - 1740	25.4				0

Drill Stem Test (recovery)

Test no.	Oil [Sm³/day]	Gas [Sm³/day]	Oil grav. [g/cm³]	Gas grav. rel.air	GOR [m³/m³]
1.0	170	10000	.900	.640	59
2.0	515	30000	.900	.640	59

Available logs

Log type	Intervals logged [m]
IEL BHC ACL GR SP	145 - 2007
DLL MLL GR	1700 - 2008
CDL CNL	1340 - 2008
CDM AP	1340 - 2008
SWC	1397 - 2007
VELOCITY	145 - 2007

Lithostratigraphy

Top depth [m]	Litostratigraphic unit
150	NORDLAND GP
578	UTSIRA FM
943	HORDALAND GP
1077	SKADE FM
1101	NO FORMAL NAME
1399	GRID FM
1443	NO FORMAL NAME
1733	ROGALAND GP
1733	INTRA BALDER FM SS
1804	BALDER FM
1820	SELE FM
1831	HERMOD FM
1848	SELE FM
1859	LISTA FM
1906	HEIMDAL FM
1939	LISTA FM
1950	HEIMDAL FM
1955	LISTA FM
1991	SHETLAND GP
1991	EKOFISK FM
2001	VIKING GP

Composite log

No composite log presently available.

Geochemical information available at the NPD

No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.

Documents reported by the licencees (period for duty of secrecy expired)

Geological_Completion_Report	(Format:PDF. Size: 5.645 Mb )
Drilling_And_Evaluation_Program	(Format:PDF. Size: 4.567 Mb )
Paleontological_Study	(Format:PDF. Size: 1.072 Mb )
02_Final_Well_Report	(Format:PDF. Size: 46.583 Mb )
Test_Glomar_Biscay_	(Format:PDF. Size: 26.485 Mb )
PVT_Study_Report_Test_1	(Format:PDF. Size: 6.476 Mb )
PVT_Study_Report_Test_2	(Format:PDF. Size: 10.766 Mb )
PVT_Study_Report_Test_2_Surface_Sampl	(Format:PDF. Size: 11.494 Mb )
03_Completion_log	(Format:PDF. Size: 1.238 Mb )

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Old NPD WDSS reports, NPD papers and other related documents

WDSS_General_Information	(Format:PDF. Size: 0.086 Mb )
WDSS_completion_log	(Format:PDF. Size: 0.164 Mb )

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