WE Report

Lessons Learned

Lessons Learned865


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

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
6801 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 After evaluating related risks of RIH with torque tool and stinger in one run – a decision was made . . .

Lene Lomeland


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DNO
6802 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 The pre-torque was not conducted in town. Unable to fit it in the buckling machine in the workshop. . . .

Lene Lomeland


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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
6805 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Removed one slip element to allow passage of Frelok hydraulic line below RF without damage.

Lene Lomeland


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DNO
6806 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Used BX3 when FA-1 was observed to be incompatible with 20” casing.

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
6809 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Difficulties to install the double drilling machine at scaffolding at diverter level for cutting the . . .

Lene Lomeland


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DNO
6810 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Failure of Dril-quip lifting eyes while laying out the diverter from vertical to horizontal . . .

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
6813 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Space out incorrect compared to Stack-up drawing from Well partner. The upper spool of the WH stack . . .

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
6758 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Movement of conductor. Adjusted scaffold at diverter platform. Installed chain hoist horizontally in . . .

Lene Lomeland


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DNO
6759 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 The flowrate during cleanout of conductor was limited to 2000 lpm due to overflow of bird bath. . . .

Lene Lomeland


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DNO
6760 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 During cleanout of conductor was filled with fluid. When drilling the drain hole the fluid poured . . .

Lene Lomeland


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