Well Data Manager / Well Summary / 21/29b- 4

21/29b- 4

Decommissioned

Well Header

Well No
21/29b- 4
NSTA DEN No
2344
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 29 b
Surface Location
57.007486, 0.723018
Source Datum
ED50
Subsea Well
No
Platform
--
Slot No
--
Operator
PREMIER OIL (ENCORE PETROLEUM) LIMITED
Original Operator
--
Sub Area Operator
PREMIER OIL (ENCORE PETROLEUM) LIMITED
Licence No
P215
Licence Type
Production
Spud Date
1984-03-22
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/29b- 4 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil Show
Dev Type
--
Convention
--
Primary Target
B
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
24.994
Ground Elev (m)
--
Water Depth (m)
91.14
TD MD (m)
2403.350
TD TVDSS (m)
2378.350
TD Datum Depth (m)
24.994
TD Datum Type
Kelly Bushing
Spud Date
1984-03-22
TD Reached
1984-04-23
Completion Date
1984-04-26
Release Date
1988-04-26

Formation Tops (23)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/29b- 4 Horda Cenozoic 1303.000 1277.949 Lloyds Register
Stronsay Cenozoic 1303.000 1277.949 Lloyds Register
Lower Tay Sandstone 1563.000 1537.948 Lloyds Register
Moray Mesozoic 1609.000 1583.943 Lloyds Register
Balder Cenozoic 1609.000 1583.943 Lloyds Register
Sele Mesozoic 1631.000 1605.938 Lloyds Register
Montrose Mesozoic 1646.000 1620.935 Lloyds Register
Lista Mesozoic 1646.000 1620.935 Lloyds Register
Maureen Mesozoic 1710.000 1684.920 Lloyds Register
Chalk Mesozoic 1732.000 1706.916 Lloyds Register
Ekofisk Mesozoic 1732.000 1706.916 Lloyds Register
Upper Cretaceous Chalk Mesozoic 1783.000 1757.909 Lloyds Register
Cromer Knoll Mesozoic 2073.000 2047.874 Lloyds Register
Rodby Mesozoic 2073.000 2047.874 Lloyds Register
Sola 2080.000 2054.873 Lloyds Register
Valhall Mesozoic 2107.000 2081.871 Lloyds Register
Kimmeridge Clay 2213.000 2187.860 Lloyds Register
Humber Mesozoic 2213.000 2187.860 Lloyds Register
Fulmar Mesozoic 2299.000 2273.855 Lloyds Register
Heron Palaeozoic 2333.000 2307.854 Lloyds Register
Skagerrak Mesozoic 2333.000 2307.854 Lloyds Register
Turbot Anhydrite Palaeozoic 2362.000 2336.853 Lloyds Register
Zechstein Palaeozoic 2362.000 2336.853 Lloyds Register

Lithology Intervals

21/29b- 4 Curve: SANDCOUNT 51 intervals  ·  MD 197.968 – 2361.590 m G:/NSTA_BigFiles/NSTA_Packages/Lloyds_Register/NSTA Centr...
Limestone (27)
Sandstone (24)

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log
Wellbore Groups Formations Members Strat Intervals Tops HC Occ Core Cuttings DSTs
21/29b- 4 8 14 1 47 23 2 0 1 0 View

Hydrocarbon Occurrence (1)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/29b- 4 Mixed shows OGS Strathtay Formation 1551.7368000000001 -- 18 m thick

Rock Samples (1)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/29b- 4 Cuttings 185.93 2401.82 -- -- came in as 21/29A-M 4 .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/29b- 4 113.53800201416016 2408.224853515625 9 0 2026-08-06 17:29:31.375386+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/29b- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density DEN CGG Digital Well Logs 1493.3676 2407.7676 6001
caliper CAL CGG Digital Well Logs 1492.758 2408.2248 6008
caliper CALS CGG Digital Well Logs 2109.0636 2408.2248 1964
comp_sonic AC CGG Digital Well Logs 214.42680000000001 2404.2624 14370
deep_resistivity RD CGG Digital Well Logs 2109.216 2402.5860000000002 1926
density_correction CORR CGG Digital Well Logs 1493.3676 2407.7676 6001
gamma_ray GR CGG Digital Well Logs 113.53800000000001 2401.5192 15013
micro_resistivity RMLL CGG Digital Well Logs 2109.216 2407.7676 1960
neutron_por CNL CGG Digital Well Logs 1492.9104 2405.4816 5989
shallow_resistivity RS CGG Digital Well Logs 2109.216 2402.8908 1928

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/29b- 4 69 2403.350 2378.201 D:\BigSpatial\nsta_raw\CGG_Deviation\21-29b-4 1073t-CGG-deviation.xlsx

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