WE Report

Lessons Learned

Lessons Learned865


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

DNO
5864 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
BOP running 30/07/2023 Used two ROVs to guide the BOP on top of WHH. No problems.

Drilling Engineer / Morten Laget


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Wellesley
5845 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
P&A 12/07/2023 Pulled casing hanger with upper annular closed and C&K lines closed.

Drilling Engineer / Morten Laget


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Wellesley
5833 – Wellesley

Deepsea Yantai Other Operational 35/10-10S
Carmen
N/A 13/06/2023 Unable to lift the BOP elevator with LMRP past fixed guide/bumper beams in moonpool. LMRP diameter . . .

Drilling Engineer / Morten Laget


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DNO
2006 – DNO

Borgland Dolphin Drilling
Own Experience
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
P&A 02/08/2021 When pulling 13 3/8″ seal assembly on other wells the choke and kill line failsafes were open . . .

Drilling Supervisor / Stig Seland



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PGNiG
352 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019
Due to protecting melons on riser joints, the riser joints were not sufficiently balanced. This . . .


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PGNiG
353 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 Observed last riser joint slipped out of RCWM trolley when picking up joint to vertical position . . .


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PGNiG
354 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 Kelly hose trapped in Riser guard groove. Continued using straps around the guards to avoid . . .


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PGNiG
355 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Reservoir section 22/10/2019 When P/T lower pipe ram a leak was discovered in the choke line latch coupling between LMRP and BOP . . .


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PGNiG
377 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Reservoir section 22/10/2019 Waited for 30 minutes for annular relaxation after a P/T.


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