WE Report

Lessons Learned

Lessons Learned865


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

DNO
8433 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
Production section 15/03/2025 Not able to get BOP test – Burst seal on CHSART

Ole Marius Serigstad / Stig Seland


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DNO
8394 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
Production section 07/03/2025 KOP set on ACST tool above 9 5/8” casing cut at ~1192 m to 1051 m (47 m inside 20” casing – shoe at . . .

Ole Marius Serigstad / Stig Seland


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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
6960 – DNO

Deepsea Yantai External Environment
Own Experience
Other 25/7-11 S
Norma
Other 06/11/2024
Tilbakemelding fra NEA:
Vi registrerer at rapportert forbruk av diesel til kraftgenerering er . . .

Helene Folkvord / Anniken Meisler



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DNO
6877 – DNO

Nobel Invincible External Environment
Own Experience
Planning 2/6-7 S
Falstaff
Other 10/10/2024 The PSV’s have crew change every 4 weeks meaning that at some point we are not able to meet this . . .

Helene Folkvord / Anniken Meisler



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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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DNO
5923 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Reservoir section 17/09/2023 While sampling the MDT Saturn probe got stuck. All attempts to free with wireline tension, cycling . . .

Drilling Engineer / Morten Laget


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DNO
5924 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Reservoir section 17/09/2023 Side door overshot had to be run (provided by Archer with Archer-supplied procedures)

Drilling Engineer


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DNO
5912 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
N/A 06/09/2023 Plugging of transfer lines when taking Microbar from vessels several times.

John Langelandsvik / Morten Laget


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DNO
5873 – DNO

Deepsea Yantai Testing
Own Experience
Operational 25/7-11 S
Norma
Testing 11/08/2023

admin


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DNO
5872 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 07/08/2023 the ROP is very slow ( 1-2 m/hr) after drilling approximately 1500 meters using XZ816 PDC bit. . . .

Drilling Engineer / Morten Laget


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DNO
5852 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 The pH meter showed indications of cement in return (pH value of 11.6-12.3). Due to poor visibility . . .

Drilling Engineer / Morten Laget


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DNO
5853 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 After the cement of the 30″ conductor was set up the WHRT was released and POOH. Movement was seen . . .

Drilling Engineer / Morten Laget


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DNO
5854 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 When checking for cement outside the condcutor there was no cement to be found on 3/4 of the sides. . . .

Drilling Engineer / Morten Laget


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DNO
5855 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 After the 30″ conductor shoe was drilled the inclination of the conductor increased. Used the WHRT . . .

Drilling Engineer / Morten Laget


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DNO
5856 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Used the ROV dredging around the conductor after drilling the 9 7/8″ Pilot hole. The cleaning with . . .

Drilling Engineer / Morten Laget


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DNO
5857 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Due to problems with cement around the conductor and movement in conductor a clamp-on inclinometer . . .

Drilling Engineer / Morten Laget


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DNO
5858 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Due to problems with cement around the conductor and movement in conductor a Bullseye bracket from . . .

Drilling Engineer / Morten Laget


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DNO
5859 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Drawwork in landing mode. No change in hookload while cementing and displacing.

Drilling Engineer / Morten Laget


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DNO
5860 – DNO

Deepsea Yantai Drilling
Own Experience
Planning 25/7-11 S
Norma
Top hole 30/07/2023 One of the stop collars fell of when it was picked up from the boat. When laying down the . . .

Drilling Engineer / Morten Laget


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