WE Report

Lessons Learned

Lessons Learned865


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

PGNiG
8265 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 14/02/2025 Suction problems during start of cement job. Problems with suction due to air in mixing system. . . .

Drilling Engineer


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PGNiG
8266 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 Had to run SMO on pipe due to too much heave.

Drilling Engineer


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PGNiG
8267 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
9 7/8″ Pilot hole 14/02/2025 Very high ECD readings from MWD. Approaching FG. Suspected clay sticking to stab behind bit.

Drilling Engineer


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PGNiG
8268 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 MW keeps increasing, having to add a lot of premix. Ran short on premix and had to mix in water to . . .

Drilling Engineer


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PGNiG
8269 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 Tight spots which required up to 25 MT overpull to pull above.

Drilling Engineer


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PGNiG
8270 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 Due to bad weather and rig movement, it was evaluated and decided to install CRTi to be able to . . .

Drilling Engineer


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PGNiG
8203 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 03/02/2025 NA

Drilling Engineer


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PGNiG
8204 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 03/02/2025 Lost marker buoys out of basket when deploying.

Drilling Engineer


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PGNiG
8205 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 03/02/2025 Protan AM sleeve came sliding down after making up connection on 36” WHH. Joint and conductor string . . .

Drilling Engineer


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PGNiG
8206 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 03/02/2025 Fiberglass inner string broke off due to strong currents.

Drilling Engineer


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PGNiG
7698 – PGNiG

Deepsea Yantai HSEQ
PSA Q&A
Planning 6501/10-1
Tomcat
Other 06/12/2024

Question 1. Brønn 6305/10-1 «Tomcat» er definert som en exploration well. Vi ber om bekreftelse på . . .

Åse Kristin Pettersen / Stig Seland



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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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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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PGNiG
5838 – PGNiG

Deepsea Yantai External Environment Planning 6501/10-1
Tomcat
Environmental Seabed inspection 19/06/2023 During preparation of SoW, Marine department needed input from Engineering Company (InterMoor) to . . .

Stian Engvik / Morten Laget



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PGNiG
5834 – PGNiG

Deepsea Yantai Drilling
Own Experience
Planning 6305/10-1
Tomcat
N/A 15/06/2023
BO&K Analysis performed in Aug 2022, with a sensitivity on revised reservoir data.

The . . .

Richard Mollison / Morten Laget



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PGNiG
4946 – PGNiG

Deepsea Yantai Drilling
Experience Transfer Meeting
Operational 6608/1-1 S
Copernicus
Production section 03/11/2022
The gas readings for the 12 ¼” was done very well, and the correlation was quite good between the . . .

Richard Mollison



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PGNiG
4923 – PGNiG

Deepsea Yantai Logistics
Own Experience
Planning 6608/1-1 S
Copernicus
Other 03/10/2022 With this focus the mobilization plan became a live document and with a weekly focus, ensuring all . . .

Johan Kjos-Hanssen / Morten Laget



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PGNiG
4948 – PGNiG

Deepsea Yantai External Environment
NEA Q&A
Planning 6608/1-1 S
Copernicus
Other 28/09/2022

Det kan forventes sporadisk fiskeriaktivitet med fartøy som fisker med konvensjonelt redskap etter . . .

Sanne Risbakk



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PGNiG
4914 – PGNiG

Deepsea Yantai HSEQ
Own Experience
INTERNAL
End of Well 6608/1-1 S
Copernicus
Other 26/09/2022 We didn’t ask of information from the DSV during the operation

Åse Kristin Pettersen / Morten Laget


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