WE Report

Lessons Learned

Lessons Learned865


Operator Rig Discipline / Origin Project Phase Well Section Date What Happened

DNO
8394 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
Production section 07/03/2025 KOP set on ACST tool above 9 5/8” casing cut at ~1192 m to 1051 m (47 m inside 20” casing – shoe at . . .

Ole Marius Serigstad / Stig Seland


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Wellesley
6254 – Wellesley

COSLPromoter, COSL Promoter Drilling Operational 35/11-5, 39/11-29S
Toppand East
Reservoir section 30/05/2024 Needed to change the BX inserts. Resulting in 30 min rig time and unnecessary manual handling.

Drilling Engineer / Morten Laget



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Wellesley Petroleum
6257 – Wellesley Petroleum

COSLPromoter, COSL Promoter Drilling Operational 35/11-5, 39/11-29S
Toppand East
Top hole 30/05/2024
– Due to short length from bit to stab ( approx 0.5m) it is challenging to install master bushing . . .

Drilling Engineer / Morten Laget


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Wellesley Petroleum
6258 – Wellesley Petroleum

COSLPromoter, COSL Promoter Drilling Planning 35/11-5, 39/11-29S
Toppand East
Top hole 30/05/2024
– 9 1/2″ DC need high M/U torque and might need to use rig tongs.
– 9 1/2″ DC needs lifting subs . . .

Drilling Engineer / Morten Laget


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Wellesley
467 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 31/08/2020 More manual handling and time spent in addition to less efficient handling when not having all BHA . . .

Drilling Engineer


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PGNiG
348 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 XBAT was run on 17 1/2″ BHA regardless.


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PGNiG
358 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Production section 22/10/2019
Backup 12 ¼” BHA tools not testing correctly (XBAT, PWD and HCIM)
Shipped out new backup XBAT and . . .


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PGNiG
362 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Reservoir section 22/10/2019
Drilled to core point and POOH. Experienced tool problems on ADR and XBAT (Sonic). HAL onshore was . . .


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PGNiG
363 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Reservoir section 22/10/2019 Time consuming to test HAL MWD tools onboard.


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PGNiG
364 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Reservoir section 22/10/2019 Time consuming to handle and M/U BHA.


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PGNiG
365 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Reservoir section 22/10/2019 Racked core barrels, saving rig time.


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Faroe
286 – Faroe

Transocean Arctic Drilling Operational 31/7-3 S
Brasse
Top hole 02/10/2019 Drilling 36″ was a challenge – boulders from just below seabed(148 m) to 181 m. Repeated reaming . . .


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Faroe
271 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Intermediate section 27/09/2019 Observed stick-slip while drilling through sand intervals and after a limestone stringer.


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DNO
309 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
Surface section 07/01/2019 Not able to use the IRN to MU the motor assembly to the ARC-9 assembly due to short distance between . . .


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