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Exploration wellbore: 2/5-3

General information

NPDID wellbore:	258
Well name:	2/5-3
Drilling operator name:	Amoco Norway Oil Company
Geodetic datum:	ED50
Coordinates:	56° 35` 50.80`` N	3° 26` 58.80`` E
UTM coordinates:	6272806.93 N	527611.80 E
UTM zone:	31
Drilled in production licence:	006
Area:	NORTH SEA
Discovery:	2/5-3 SØRØST TOR
Field:	NOT YET DEVELOPED
Drill permit:	67-L
Drilling facility:	ZAPATA EXPLORER
Drilling days:	75
Wellbore entry date:	02.04.1972
Wellbore completion date:	15.06.1972
Original wellbore purpose:	WILDCAT
Wellbore purpose:	WILDCAT
Wellbore status:	P&A
Wellbore contents:	OIL
Discovery wellbore:	YES
Formation/age with hydrocarbons 1:	EKOFISK FM / PALEOCENE
Formation/age with hydrocarbons 2:	TOR FM / LATE CRETACEOUS
Formation/age with hydrocarbons 3:	HOD FM / LATE CRETACEOUS
Seismic location:
Kelly bushing elevation (KB) [m]:	34
Water depth [m]:	67
Total Depth (MD) [m]:	3731
Final vertical depth (TVD) [m]:
Max inclination [°]:
Bottom hole temperature [°C]:	122
Oldest penetrated age:	LATE PERMIAN
Oldest penetrated formation:	ZECHSTEIN GP
Note: All depths, except the water depth, are relative to kelly bushing (RKB)

Wellbore history

General

Well 2/5-3 was drilled ca 8 km southeast of the Tor Field. The primary target was top Danian chalk. Secondary targets were top Paleocene and base chalk at 3551 m (11650 ft). Planned total depth was 3597 m (11800 ft).

Operations and results

Well was spudded with the jack-up installation Zapata Explorer on 2 April 1972 and drilled to TD at 3731 m in the Late Permian Zechstein Group.

Top Paleocene was encountered at 2929 m, top Ekofisk Formation at 3037 m, top Tor Formation at 3121 m, and top Hod Formation at 3481 m. First show was reported in a limestone stringer at 2259 m. Occasional oils shows, in limestone stringers, were reported in the interval 2604 to 2877 m. The top 3 m of the Paleocene (Balder Formation) was silty and had good oil shows. Oil was found by drill stem testing in the Ekofisk and Tor Formations. Shows continued down to 3261 m in the Tor Formation.

Fifteen conventional cores were cut in the Ekofisk and Tor Formations, recovering a total length of 123.3 m core.

The well was suspended on 15 June 1972 as an oil discovery.

Testing

Three zones were drill stem tested. The following results are after acidization:

DST 1 tested the interval 3386 - 3395 m in the lower part of the Tor Formation and flowed 21 m3 water /day.

DST 2 tested the interval 3120 - 3191 m in the upper part of the Tor Formation. Average flow parameters at maximum choke, 40/64", was 682 Sm3 oil and 340400 Sm3 gas /day. The oil gravity was 36 deg API and the GOR was 463 Sm3/Sm3. The GOR on smaller choke sizes was significantly lower, down to 233 Sm3/Sm3 on a 16/64 "choke.

DST 3 tested the interval 3053 - 3065 m in the Ekofisk Formation and flowed on average 682 Sm3 oil and 141330 Sm3 gas /day on a 32/64" choke. The water production during this flow decreased from 57 to 17.5 m3 /day and the GOR decreased from 213 to 179 Sm3/Sm3. The oil gravity was 38.2 deg API.

Cuttings available at the NPD

Interval [m]: 142.95 - 3730.75

Cores available at the NPD

Core length [m]: 123.32

Core number	Interval
1	9998-10011'
2	10012-10023'
3	10025-10064.6'
4	10068-10125'
5	10125-10145'
6	10145-10208.6'
7	10208.6-10243'
8	10243-10265'
9	10265-10301'
10	10301-10339'
11	10342-10402'
12	10402-10430'
13	10435-10461'
14	10472-10494'
15	10505-10549'

Scanned core photos

10015-10032ft	10015-10032ft	10032-10049ft	10049-10064ft	10064-10081ft
10081-10097ft	10097-10112ft	10112-10127ft	10127-10142ft	10142-10145ft
10145-10161ft	10161-10208ft	10208-10226ft	10226-10246ft	10246-10260ft
10260-10279ft	10279-10297ft	10297-10314ft	10314-10330ft	10330-10350ft
10350-10364ft	10364-10379ft	10379-10395ft	10395-10412ft	10412-10427ft
10427-10443ft	10443-10458ft	10458-10483ft	10483-10510ft	10510-10527ft
10527-10542ft	10542-10549ft

Palynological slides available at the NPD

No palynological slides in this wellbore.

Oil samples available at the NPD

No oil samples available.

Casing and leak-off tests

Type	Casing diam. [inch]	Depth below KB [m]	Hole diam. [inch]	Hole depth below KB [m]
CONDUCTOR	30	143.0	36	143.0
INTERM.	20	375.0	26	392.0
INTERM.	13 3/8	1588.0	17 1/2	1588.0
INTERM.	9 5/8	3031.0	12 1/4	3044.0
LINER	7	3717.0	8 1/2	3731.0

Mud

No mud data available.

Drill stem test (intervals and pressures)

Test no.	Test interval [m]	Choke size [mm]
1.0	3386 - 3395
2.0	3121 - 3191	15.9
3.0	3053 - 3065	12.5

Drill Stem Test (recovery)

Test no.	Oil [Sm³/day]	Gas [Sm³/day]	Oil grav. [g/cm³]	GOR [m³/m³]
1.0	0	0		0
2.0	682	340400	.844	464
3.0	682	141330	.830	179

Available logs

Log type	Intervals logged [m]
BHC	366 - 1597
BHC-C	1588 - 3733
GR-N	2957 - 2526
FDC	3032 - 3731
SNP	3032 - 3731
IES	375 - 3737
DL	3032 - 3697
ML MLL	3032 - 3505
CBL	1402 - 3731
ADM AP	1593 - 3731
CDM FP	1593 - 3731
CDM PP	1593 - 3731
TS	67 - 3005
VELOCITY	67 - 3732

Lithostratigraphy

Top depth [m]	Litostratigraphic unit
101	NORDLAND GP
1660	HORDALAND GP
2929	ROGALAND GP
2929	BALDER FM
2943	SELE FM
2958	LISTA FM
3026	VÅLE FM
3037	SHETLAND GP
3037	EKOFISK FM
3121	TOR FM
3481	HOD FM
3616	CROMER KNOLL GP
3716	ZECHSTEIN 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)

No documents presently available.

Old NPD WDSS reports, NPD papers and other related documents

WDSS_General_Information

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