WE Report

Lessons Learned

Lessons Learned865


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

DNO
6761 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Longer time than anticipated for grinding the weld on conductor.

Lene Lomeland


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DNO
6762 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Conductor sent out with metal protectors.

Lene Lomeland


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DNO
6763 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 The hammer and drive sleeve were made up on the rig by Expro crew. The hammer and drive sleeve were . . .

Lene Lomeland


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DNO
6764 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Due to lack of availability of the S200 hammer an S280 was used. During the majority of the driving . . .

Lene Lomeland


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DNO
6765 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 After 2 ½ joints was driven in ground the rebound was observed to be very high, Blowcount was also . . .

Lene Lomeland


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DNO
6766 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Both TFMC and Mitsui numbers marked on joints. TFMC rig numbers marked but with prefix TFMC making . . .

Lene Lomeland


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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
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
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
6259 – Wellesley Petroleum

COSLPromoter, COSL Promoter Drilling Operational 35/11-5, 39/11-29S
Toppand East
Top hole 30/05/2024 The weight of the LPWHH was 15.4 ton w/o handling clamp and 17.2 tons with the handling clamp.

Drilling Engineer / Morten Laget


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Wellesley Petroleum
6260 – Wellesley Petroleum

COSLPromoter, COSL Promoter Drilling Operational 35/11-5, 39/11-29S
Toppand East
Top hole 30/05/2024 Low resolution on the bullseye with 5 deg, compared to the 2 deg we had on top. Needed to use a . . .

Drilling Engineer / Morten Laget


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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 . . .

Ã…se 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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