WE Report

Lessons Learned

Lessons Learned865


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

DNO
8327 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 20/02/2025 Wrong lineup of hydraulic hoses from shore.

Stein-Petter Slatlem


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DNO
8328 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 20/02/2025 Having KCL level at 200 kg/m3 was a success factor to drilling section.

Stein-Petter Slatlem


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PGNiG
8271 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 The centralizer placement on the 20” interfered with the rollers on the casing tong.

Drilling Engineer


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PGNiG
8272 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 Not able to sting in CRTi to XO joint due to smaller ID.

Drilling Engineer


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PGNiG
8273 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 SMO stickup higher than what was communicated in DOP. Caused issues regarding visual confirmation of . . .

Drilling Engineer


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PGNiG
8285 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 Set HAL suspension plug as pr HAL manual, plug depth +- 593 m. Pressure tested plug to 290 bar/10 . . .

Drilling Engineer


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DNO
8260 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 14/02/2025 Deep seat bucket takes a lot of rig time to install on drillfloor.

Drilling Engineer


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DNO
8261 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 14/02/2025 Observed pressure increase during CMT operation.

Drilling Engineer


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DNO
8262 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 14/02/2025
Deployed SMO on winch. ED’s recommendation is to run on DP. It was difficult to hold correct . . .

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
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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DNO
8200 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 02/02/2025 Difficulties spinning in and M/U 7” Tubing.

Stein-Petter Slatlem / Stig Seland


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DNO
8201 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 02/02/2025 Low ROP caused by worn out bit and balling.

Stein-Petter Slatlem / Stig Seland


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DNO
8202 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 02/02/2025
Hal Foam cementers had a check of line-up and inspected filter unit. Found a lot of Cement debris . . .

Stein-Petter Slatlem / Stig Seland


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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
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
6059 – Wellesley

No Rig No well Surface section 21/12/2023

Drilling Engineer


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DNO
5872 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 07/08/2023 the ROP is very slow ( 1-2 m/hr) after drilling approximately 1500 meters using XZ816 PDC bit. . . .

Drilling Engineer / Morten Laget


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