WE Report

Lessons Learned

Lessons Learned865


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

DNO
8433 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
Production section 15/03/2025 Not able to get BOP test – Burst seal on CHSART

Ole Marius Serigstad / Stig Seland


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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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DNO
8259 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
N/A 14/02/2025 HLB has provided a Commander 1000 cement head for launching darts and is to be used for the entire . . .

Drilling Engineer


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DNO
6960 – DNO

Deepsea Yantai External Environment
Own Experience
Other 25/7-11 S
Norma
Other 06/11/2024
Tilbakemelding fra NEA:
Vi registrerer at rapportert forbruk av diesel til kraftgenerering er . . .

Helene Folkvord / Anniken Meisler



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DNO
6877 – DNO

Nobel Invincible External Environment
Own Experience
Planning 2/6-7 S
Falstaff
Other 10/10/2024 The PSV’s have crew change every 4 weeks meaning that at some point we are not able to meet this . . .

Helene Folkvord / Anniken Meisler



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PGNiG
6747 – PGNiG

Deepsea Yantai Marine
Own Experience
Operational 6501/10-1
Tomcat
Pre-Lay 15/09/2024
We started on anchor 4. This anchor was together with anchor 5 and 6 supposed to be installed to . . .

Stian Engvik / Stig Seland


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Wellesley
6455 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-12 S
Gnomoria
P&A 05/07/2024 Observed flowback of the mud lost while running and cementing 9 5/8″ casing. Of ±200 m3 of mud lost, . . .

Drilling Engineer / Morten Laget



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Wellesley
6456 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-12 S
Gnomoria
P&A 05/07/2024 Discussion about the risk of accidentally pulling the seal assembly free (no outer lock ring . . .

Drilling Engineer / Morten Laget



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Wellesley Petroleum
6454 – Wellesley Petroleum

COSLPromoter, COSL Promoter External Environment
Own Experience
Operational 35/11-5, 39/11-29S
Toppand East
Other 02/07/2024
Recieved phonecall from SAR Florø which have not been informed about Toppand East well. The waste . . .

Helene Folkvord


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Wellesley
6391 – Wellesley

COSLPromoter Drilling
Own Experience
Planning 35/10-12AS
Gnomoria
Surface section 12/06/2024 Not possible to M/U the no-cross joint, because it was not possible to grip with the casing tong on . . .

Giacomo Bonomo / Morten Laget



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Wellesley
6384 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-4 A
Gnomoria
Top hole 11/06/2024 RMR external adapter in place. Not possible to easily access profile and install VX gasket without . . .

Giacomo Bonomo / Morten Laget



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Wellesley
6368 – Wellesley

COSLPromoter, COSL Promoter Drilling
Own Experience
Operational 35/11-5, 39/11-29S
Toppand East
Reservoir section 06/06/2024 The BOP test tool could not be used, because one of the TJ was in conflict with the LPR. The TJ . . .

Giacomo Bonomo / Morten Laget



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Wellesley
6369 – Wellesley

COSLPromoter, COSL Promoter Drilling
Own Experience
Operational 35/11-5, 39/11-29S
Toppand East
Surface section 06/06/2024 Not possible to reach the profile depth with the ROV jetting tool, as the RMR external adapter top . . .

Giacomo Bonomo / Morten Laget



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Wellesley Petroleum
6255 – Wellesley Petroleum

COSLPromoter HSEQ
Own Experience
Planning 35/11-29 S
Toppand East
Other 30/05/2024 During the operation (22.05.24) an observation card was written that there was not a proper . . .

Åse Kristin Pettersen / Åse Kristin Pettersen



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PGNiG
6223 – PGNiG

Deepsea Yantai HSEQ
Own Experience
Planning 6501/10-1
Tomcat
Other 08/05/2024
An evaluation of some changes was not documented.
A MOC process should cover any RELEVANT changes . . .

Åse Kristin Pettersen / Stig Seland


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PGNiG
6874 – PGNiG

No Rig Other
Own Experience
Planning 6501/10-1
Tomcat
N/A 06/11/2023 It is strong currents at the location, and it was very hard to keep the ROV stable when surveying . . .

Anniken Meisler / Anniken Meisler



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Wellesley
5937 – Wellesley

Deepsea Yantai Drilling
Own Experience
INTERNAL
Operational 35/10-10S
Carmen
Other 24/10/2023 During operation several MoC’s were made. A link to the risk register was enclosed in the MoC . . .

Åse Kristin Pettersen


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Wellesley
5936 – Wellesley

Deepsea Yantai Marine
Own Experience
Operational 35/10-10S
Carmen
CAN-Ductor 23/10/2023 Risk of WOW during Carmen CAN-Ductor installation and recovery leading to Wellesley being . . .

Stian Engvik / Morten Laget


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DNO
5927 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
N/A 19/09/2023 Mud cooler was used frequently throughout the wells. It was mobilized during Eirik and rigged up . . .

John Langelandsvik / Morten Laget


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DNO
5923 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Reservoir section 17/09/2023 While sampling the MDT Saturn probe got stuck. All attempts to free with wireline tension, cycling . . .

Drilling Engineer / Morten Laget


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