WE Report

Lessons Learned

Lessons Learned865


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

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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DNO
8263 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Run BOP 14/02/2025 BOP had to be pulled just before landing due to grouting job necessary for conductor. Not able to . . .

Drilling Engineer


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DNO
8264 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 14/02/2025 MWD spent nightshift to program and confirm BHA. In the morning hours, it turns out that the plan . . .

Drilling Engineer


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DNO
8207 – DNO

Deepsea Yantai Marine 35/10-13
Kjøttkake
08/02/2025 Monkey fist not attached to wellhead running tool prior to rigging up. Had to wait for ROV to make . . .

Drilling Engineer


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DNO
8208 – DNO

Deepsea Yantai Drilling 35/10-13
Kjøttkake
08/02/2025 POOH and commenced drilling 26” hole section with RMR. After 20” casing was set and BOP ready to . . .

Drilling Engineer


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DNO
8197 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Top hole 02/02/2025 Failed remote low torque valve on foam cement equipment, replaced pneumatic valve with manual item.

Stein-Petter Slatlem / Stig Seland


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DNO
8198 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Top hole 02/02/2025 Did not work from drillers cabin, and had to use control panel from OWS. The panel were still in the . . .

Stein-Petter Slatlem / Stig Seland


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DNO
8199 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Top hole 02/02/2025 Difficulties marking LPWHH as per DOP on deck prior to running same.

Stein-Petter Slatlem / Stig Seland


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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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DNO
6978 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
P&A 21/11/2024 Sat the EZSV and tagged with 6t and and overpull of 27t. Performed two pressure tests, but both . . .

Drilling Engineer


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DNO
6967 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
P&A 11/11/2024 For plug #1D incorrect concentration of retarder was used in the cement mix – extending the . . .

Lene Lomeland


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DNO
6968 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
P&A 11/11/2024 Due to incorrect concentration of retarder in #1D it was uncertainty of the density of the cement . . .

Lene Lomeland


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DNO
6969 – DNO

Nobel Invincible Drilling Planning 2/6-7 S
Falstaff
P&A 11/11/2024 Attempted to dress off cement after the sample in the UCA cell started to build compressive . . .

Lene Lomeland


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DNO
6970 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Reservoir section 11/11/2024
When RIH with Whipstock/Milling BHA to set the Whipstock, it took weight in the 9 5/8” liner – not . . .

Lene Lomeland


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DNO
6971 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Reservoir section 11/11/2024 The anchor for the first Whipstock did not set probably – did not grip onto the casing. When putting . . .

Lene Lomeland


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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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