WE Report

Lessons Learned

Lessons Learned865


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

DNO
8480 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Intermediate section 24/03/2025 Commander 1000 is a very heavy CMT-head. Due to its weight, it is not preferable to use on DSY . . .

Sander Schaathun / Stig Seland


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DNO
8483 – DNO

Deepsea Yantai HSEQ Operational 35/10-13
Kjøttkake
P&A 24/03/2025 When cementer was dropping/pushing CST into DP filled with OBM “splashed” out of pipe and spilled on . . .

Sander Schaathun / Stig Seland


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DNO
8381 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
P&A 04/03/2025 When cutting the 9 5/8” casing with low flow / pressure, the parameters spiked / fluctiated. When . . .

Sander Schaathun / Stig Seland


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DNO
8383 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
P&A 04/03/2025 The swedge that arrived the rig had a XO. When setting a Kelly cock on the swedge the total length . . .

Sander Schaathun / Stig Seland


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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
8323 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 1” flowmeter hose burst causing spillage of OBM in the cement unit, while bleeding off during the . . .

Sander Schaathun / Stig Seland


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DNO
8324 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 MWD spent nightshift to program and confirm BHA. In the morning hours, it turns out that the plan . . .

Sander Schaathun / Stig Seland


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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
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
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
6803 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Discovered dimensional issue between FA-1 tool and Dril-Quip couplings. Unable to enter with FA-1 . . .

Lene Lomeland


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DNO
6804 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Lifting incident: when laying down the FA-1 tool came in contact with the Expro tong and damaged the . . .

Lene Lomeland


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DNO
6807 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Used correct keys but Expro crew not fully familiar with how to install and remove – broke one key . . .

Lene Lomeland


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DNO
6808 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 XT-22 tong was used – required machinery to be used in servie mode. This due to the tong did not fit . . .

Lene Lomeland


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DNO
6811 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Handling gear was backloaded. Crew did not realize “long stub” would need to be laid out.

Lene Lomeland


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DNO
6812 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Handling gear was backloaded. Crew did not realize “long stub” would need to be laid out.

Lene Lomeland


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DNO
6757 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Unable to get pressure reading on port fwd tension cylinder. Slacked off tension system and . . .

Lene Lomeland


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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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