WE Report

Lessons Learned

Lessons Learned865


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

DNO
8259 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
N/A 14/02/2025 HLB has provided a Commander 1000 cement head for launching darts and is to be used for the entire . . .

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
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
5909 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
P&A 05/09/2023 Due to high percentage of gas in the mud return the interface had to go over the shaker system and . . .

Drilling Engineer / Morten Laget


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DNO
2108 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Intermediate section 05/09/2021
The PAB system failed before the cement job due to water ingress inside the unit which caused some . . .

Drilling Supervisor / Morten Laget


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DNO
2013 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational 2/5-15
Gomez
Top hole 14/08/2021 From among cementers it was decided to disconnect the dust collector before this job. The surge . . .

What does ETM mean?
Drilling Supervisor / Morten Laget


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DNO
305 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
Top hole 07/01/2019 Conductor set up early. Had to order out more dispersant chemicals for the 20″ cement job due to . . .


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DNO
306 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
Top hole 07/01/2019 The cement design was updated with reduced lead and increased tail slurry to provide better support . . .


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DNO
308 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
Pilot hole section 07/01/2019 Pilot hole drilled to TD before identifying shallow gas. Resulted in having to order out more . . .


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DNO
310 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
Surface section 07/01/2019 Not optimal cement recipe, needed 25 min to clean tanks between lead and tail slurry.


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DNO
311 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
Surface section 07/01/2019 Cement slurry was changed to a gas-tigh slurry due to encountering shallow gas in pilot hole. Due to . . .


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