WE Report

Lessons Learned

Lessons Learned865


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

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
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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