21/20a- 5

Decommissioned

Well Header

Well No
21/20a- 5
NSTA DEN No
5507
Well Name
--
Drill Seq No
5
Quadrant / Block
21 / 20 a
Surface Location
57.373374, 0.933203
Source Datum
ED50
Subsea Well
Unknown
Platform
--
Slot No
--
Operator
SPIRIT ENERGY NORTH SEA OIL LIMITED
Original Operator
--
Sub Area Operator
SPIRIT ENERGY NORTH SEA OIL LIMITED
Licence No
P185
Licence Type
Production
Spud Date
1995-04-10
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/20a- 5 Original
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Gas and Condensate Well
Dev Type
--
Convention
--
Primary Target
E
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
22.860
Ground Elev (m)
--
Water Depth (m)
94.79
TD MD (m)
4634.484
TD TVDSS (m)
4611.624
TD Datum Depth (m)
35.662
TD Datum Type
Rotary Table
Spud Date
1995-04-10
TD Reached
1995-06-28
Completion Date
2015-08-20
Release Date
2019-08-20

Formation Tops (29)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/20a- 5 Horda Cenozoic 2263.000 2240.140 Lloyds Register
Stronsay Cenozoic 2263.000 2240.140 Lloyds Register
Lower Tay Sandstone 2546.000 2523.140 Lloyds Register
Balder Cenozoic 2580.000 2557.140 Lloyds Register
Moray Mesozoic 2580.000 2557.140 Lloyds Register
Balder Tuff Cenozoic 2594.000 2571.140 Lloyds Register
Sele Mesozoic 2610.000 2587.140 Lloyds Register
Cromarty Sandstone Cenozoic 2612.000 2589.140 Lloyds Register
Forties Sandstone Mesozoic 2630.000 2607.140 Lloyds Register
Montrose Mesozoic 2663.000 2640.140 Lloyds Register
Lista Mesozoic 2663.000 2640.140 Lloyds Register
Balmoral Sandstone Cenozoic 2670.000 2647.140 Lloyds Register
Maureen Sandstone Mesozoic 2748.000 2725.140 Lloyds Register
Maureen Mesozoic 2748.000 2725.140 Lloyds Register
Ekofisk Mesozoic 2852.000 2829.140 Lloyds Register
Chalk Mesozoic 2852.000 2829.140 Lloyds Register
Upper Cretaceous Chalk Mesozoic 2935.000 2912.140 Lloyds Register
Rodby Mesozoic 3576.000 3553.140 Lloyds Register
Cromer Knoll Mesozoic 3576.000 3553.140 Lloyds Register
Sola 3601.000 3578.140 Lloyds Register
Valhall Mesozoic 3702.000 3679.140 Lloyds Register
Humber Mesozoic 3914.000 3891.140 Lloyds Register
Kimmeridge Clay 3914.000 3891.140 Lloyds Register
Ribble Sandstone Mesozoic 4093.000 4070.140 Lloyds Register
Heather Mesozoic 4178.000 4155.140 Lloyds Register
Pentland Mesozoic 4369.000 4346.140 Lloyds Register
Fladen Mesozoic 4369.000 4346.140 Lloyds Register
Heron Palaeozoic 4561.000 4538.140 Lloyds Register
Skagerrak Mesozoic 4561.000 4538.140 Lloyds Register

Lithology Intervals

No lithology intervals ingested for this well.

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log
Wellbore Groups Formations Members Strat Intervals Tops HC Occ Core Cuttings DSTs
21/20a- 5 8 14 7 51 29 2 2 1 1 View

Hydrocarbon Occurrence (4)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/20a- 5 Mixed shows OGS Heather Formation 4198.0104 -- 173 m thick
21/20a- 5 Mixed OG Fulmar Formation 4370.5272 -- 29 m thick
21/20a- 5 DST DST 1 -- 4387.0 4410.5 Label / Upper Jurassic
21/20a- 5 Mixed OG Pentland Formation 4399.7880000000005 -- 9 m thick

Rock Samples (40)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/20a- 5 Cuttings 923.54 4634.48 -- -- --
21/20a- 5 Core #1 4108.09 4135.22 φ 2.9% (n=2) · Kh 0.0 mD (n=2) · Density 2.84 (n=2) · COREX SERVICES GY LAM ARG SST/SLTST VFG V WL SORT VHD REPL CALC/DOL? CMT GY CLY NO VIS POROSITY. --
21/20a- 5 ↳ Plug 38 4119.433 -- φ 4.5% · Kh 0.0 mD · Density 2.85 · COREX SERVICES GY LAM ARG SST/SLTST VFG V WL SORT VHD REPL CALC/DOL? CMT GY CLY NO VIS POROSITY. --
21/20a- 5 ↳ Plug 39 4119.677 -- φ 1.2% · Kh 0.0 mD · Density 2.83 · COREX SERVICES GY LAM ARG SST/SLTST VFG V WL SORT VHD REPL CALC/DOL? CMT GY CLY NO VIS POROSITY. --
21/20a- 5 Core #2 4379.98 4387.29 φ 15.7% (n=35) · Kh 13.3 mD (n=30) · Kv 15.4 mD (n=5) · So 54.5% (n=29) · Sw 22.8% (n=29) · Density 2.68 (n=35) · COREX SERVICES BRN LAM SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY.; BRN LAM SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY.; BRN SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY.; BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY.; BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS/LAM MOD VIS POROSITY.; BRN SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS LOW/MOD VIS POROSITY.; BRN SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS/ LAM LOW/MOD VIS POROSITY.; LT BRN CALC SST FG WL SORT HD REPL DOL? CMT NAT FRACS W SPR CALC INFILL SLT/MD WISPS LOW VIS POROSITY.; LT BRN CALC SST FG WL SORT HD REPL DOL? CMT PART OPEN FRACS W SPR CALC INFILL SLT/MD WISPS LOW VIS POROSITY.; LT BRN LAM SST F-MG WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL LOW/MOD VIS POROSITY.; LT BRN LAM SST F-MG WL SORT HD BRN CLY MIC NAT FRAC W SLT/MD INFILL LOW/MOD VIS POROSITY.; LT BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY.; LT BRN/BRN LAM SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS NAT FRAC W SLT INFILL MOD VIS POROSITY.; LT BRN/BRN LAM SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS NAT FRAC SLT INFILLED LOW/MOD VIS POROSITY.; LT BRN/BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY.; LT BRN/BRN SST FG V WL SORT HD BRN CLY MIC LOW VIS POROSITY.; LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC MOD VIS POROSITY.; LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL MOD VIS POROSITY.; LT BRN/GY LAM SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY.; LT BRN/GY SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY.; LT BRN/GY SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS LOW VIS POROSITY.; LT GY CALC SST F-MG MOD WL SORT VHD REPL CALC CMT WH CLY SLT/MD WISPS NO VIS POROSITY.; LT GY LAM CALC SST F-MG WL SORT VHD REPL CALC CMT SLT/MD WISPS/LAM NO VIS POROSITY.; LT GY/BRN CALC SST F-MG WL SORT VHD REPL DOL? CMT SID? PCHS MOD VIS POROSITY.; LT GY/BRN LAM CALC SST FG WL SORT VHD REPL DOL? CMT SID? PCHS/LAM NO VIS POROSITY. very poor core return
21/20a- 5 ↳ Plug 1Q 4380.022 -- φ 2.8% · Kh 0.0 mD · Density 2.77 · COREX SERVICES LT GY CALC SST F-MG MOD WL SORT VHD REPL CALC CMT WH CLY SLT/MD WISPS NO VIS POROSITY. --
21/20a- 5 ↳ Plug 01 4380.052 -- φ 2.2% · Kh 0.0 mD · So 56.3% · Sw 22.8% · Density 2.78 · COREX SERVICES LT GY CALC SST F-MG MOD WL SORT VHD REPL CALC CMT WH CLY SLT/MD WISPS NO VIS POROSITY. --
21/20a- 5 ↳ Plug 02 4380.372 -- φ 12.0% · Kh 2.7 mD · So 49.7% · Sw 16.5% · Density 2.99 · COREX SERVICES LT BRN CALC SST FG WL SORT HD REPL DOL? CMT PART OPEN FRACS W SPR CALC INFILL SLT/MD WISPS LOW VIS POROSITY. --
21/20a- 5 ↳ Plug 2V 4380.372 -- φ 14.2% · Kv 0.1 mD · So 63.4% · Sw 23.1% · Density 2.90 · COREX SERVICES LT BRN CALC SST FG WL SORT HD REPL DOL? CMT NAT FRACS W SPR CALC INFILL SLT/MD WISPS LOW VIS POROSITY. --
21/20a- 5 ↳ Plug 03 4380.57 -- φ 9.6% · Kh 22.3 mD · So 46.9% · Sw 29.3% · Density 2.90 · COREX SERVICES LT BRN CALC SST FG WL SORT HD REPL DOL? CMT NAT FRACS W SPR CALC INFILL SLT/MD WISPS LOW VIS POROSITY. --
21/20a- 5 ↳ Plug 04 4380.875 -- φ 19.0% · Kh 2.2 mD · So 33.9% · Sw 28.2% · Density 2.63 · COREX SERVICES BRN SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS LOW/MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 05 4381.195 -- φ 17.1% · Kh 2.0 mD · So 38.3% · Sw 28.7% · Density 2.62 · COREX SERVICES BRN SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS LOW/MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 06 4381.485 -- φ 14.8% · Kh 0.9 mD · So 47.3% · Sw 32.2% · Density 2.62 · COREX SERVICES BRN SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS/ LAM LOW/MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 2Q 4381.5 -- φ 17.8% · Kh 2.4 mD · Density 2.63 · COREX SERVICES LT BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 07 4381.805 -- φ 19.5% · Kh 8.4 mD · So 53.5% · Sw 24.6% · Density 2.63 · COREX SERVICES BRN SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 7V 4381.805 -- φ 18.9% · Kv 9.9 mD · So 49.9% · Sw 24.4% · Density 2.62 · COREX SERVICES BRN LAM SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 08 4382.11 -- φ 18.1% · Kh 6.1 mD · So 54.1% · Sw 21.9% · Density 2.61 · COREX SERVICES BRN LAM SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 09 4382.399 -- φ 17.9% · Kh 4.3 mD · So 44.3% · Sw 25.5% · Density 2.60 · COREX SERVICES BRN SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 10 4382.719 -- φ 18.2% · Kh 3.0 mD · So 43.7% · Sw 30.7% · Density 2.60 · COREX SERVICES BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 11 4382.994 -- φ 18.4% · Kh 2.3 mD · So 43.8% · Sw 29.9% · Density 2.60 · COREX SERVICES BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS/LAM MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 3Q 4383.024 -- φ 18.6% · Kh 2.3 mD · Density 2.62 · COREX SERVICES LT BRN/GY LAM SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 12V 4383.344 -- φ 7.8% · Kv 0.0 mD · So 48.5% · Sw 36.0% · Density 2.69 · COREX SERVICES LT GY LAM CALC SST F-MG WL SORT VHD REPL CALC CMT SLT/MD WISPS/LAM NO VIS POROSITY. --
21/20a- 5 ↳ Plug 12 4383.344 -- φ 5.5% · Kh 0.0 mD · So 47.1% · Sw 35.4% · Density 2.93 · COREX SERVICES LT GY/BRN CALC SST F-MG WL SORT VHD REPL DOL? CMT SID? PCHS MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 13 4383.634 -- φ 11.5% · Kh 0.1 mD · So 45.4% · Sw 36.8% · Density 3.03 · COREX SERVICES LT GY/BRN LAM CALC SST FG WL SORT VHD REPL DOL? CMT SID? PCHS/LAM NO VIS POROSITY. --
21/20a- 5 ↳ Plug 14 4383.954 -- φ 11.8% · Kh 2.0 mD · So 40.5% · Sw 44.0% · Density 2.65 · COREX SERVICES LT BRN/BRN LAM SST FG WL SORT HD BRN CLY MIC SLT/MD WISPS NAT FRAC SLT INFILLED LOW/MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 15 4384.243 -- φ 17.4% · Kh 2.9 mD · So 57.5% · Sw 25.2% · Density 2.63 · COREX SERVICES LT BRN/BRN SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 16 4384.518 -- φ 18.2% · Kh 13.3 mD · So 68.9% · Sw 17.3% · Density 2.62 · COREX SERVICES LT BRN/BRN LAM SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS NAT FRAC W SLT INFILL MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 4Q 4384.548 -- φ 17.6% · Kh 24.1 mD · Density 2.63 · COREX SERVICES LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 17 4384.853 -- φ 19.3% · Kh 37.2 mD · So 68.7% · Sw 11.7% · Density 2.64 · COREX SERVICES LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 17V 4384.853 -- φ 18.4% · Kv 32.2 mD · So 60.2% · Sw 10.7% · Density 2.63 · COREX SERVICES LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 18 4385.158 -- φ 19.4% · Kh 34.2 mD · So 70.9% · Sw 8.7% · Density 2.64 · COREX SERVICES LT BRN/GY SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 19 4385.478 -- φ 21.5% · Kh 51.8 mD · So 64.9% · Sw 11.7% · Density 2.64 · COREX SERVICES LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 20 4385.721 -- φ 18.9% · Kh 72.6 mD · So 63.7% · Sw 7.4% · Density 2.64 · COREX SERVICES LT BRN/GY SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 5Q 4385.767 -- φ 19.2% · Kh 58.7 mD · Density 2.63 · COREX SERVICES LT BRN/GY SST F-MG WL SORT HD BRN CLY MIC MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 21 4386.072 -- φ 18.3% · Kh 22.5 mD · So 70.6% · Sw 9.2% · Density 2.63 · COREX SERVICES LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 21V 4386.072 -- φ 19.0% · Kv 34.7 mD · So 65.8% · Sw 9.4% · Density 2.63 · COREX SERVICES LT BRN/GY LAM SST F-MG MOD WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 22 4386.346 -- φ 18.0% · Kh 13.3 mD · So 65.0% · Sw 12.4% · Density 2.63 · COREX SERVICES LT BRN LAM SST F-MG WL SORT HD BRN CLY MIC NAT FRAC W SLT INFILL LOW/MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 23 4386.682 -- φ 14.0% · Kh 3.4 mD · So 60.0% · Sw 24.9% · Density 2.63 · COREX SERVICES LT BRN LAM SST F-MG WL SORT HD BRN CLY MIC NAT FRAC W SLT/MD INFILL LOW/MOD VIS POROSITY. --
21/20a- 5 ↳ Plug 24 4386.971 -- φ 17.6% · Kh 2.1 mD · So 56.8% · Sw 21.6% · Density 2.63 · COREX SERVICES LT BRN/BRN SST FG V WL SORT HD BRN CLY MIC LOW VIS POROSITY. --
21/20a- 5 ↳ Plug 6Q 4387.017 -- φ 17.3% · Kh 1.9 mD · Density 2.63 · COREX SERVICES LT BRN/GY SST F-MG WL SORT HD BRN CLY MIC SLT/MD WISPS LOW VIS POROSITY. --

Wireline Log Inventory (Ingested Curves)

No wireline log curves ingested for this well.

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser

No scanned LAS source files matched to this well.

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/20a- 5 0 -- -- --

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