WE Report

Lessons Learned

Lessons Learned865


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

DNO
8481 – DNO

Deepsea Yantai Drilling Planning 35/10-13
Kjøttkake
Reservoir section 24/03/2025
Reached TD without signifigent problems. Sampled acc. To plan.
Some pressure point samples . . .

Sander Schaathun / Stig Seland


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DNO
8482 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 24/03/2025 Very well executed and all objectives was met.

Sander Schaathun / Stig Seland


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DNO
8323 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 1” flowmeter hose burst causing spillage of OBM in the cement unit, while bleeding off during the . . .

Sander Schaathun / Stig Seland


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DNO
8324 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 MWD spent nightshift to program and confirm BHA. In the morning hours, it turns out that the plan . . .

Sander Schaathun / Stig Seland


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DNO
8325 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 Due to upcoming bad weather we needed to set the plug using IO support.

Sander Schaathun / Stig Seland


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DNO
8326 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 Needed to build a drilling pup for coring using a balldrop sub.

Sander Schaathun / Stig Seland


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DNO
8264 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 14/02/2025 MWD spent nightshift to program and confirm BHA. In the morning hours, it turns out that the plan . . .

Drilling Engineer


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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
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
5920 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 11/09/2023 The cap rock was longer than anticipated, difference form mainbore. The core jammed off in the . . .

Drilling Engineer / Morten Laget


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DNO
5921 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 11/09/2023 Core jammed off on all 3 cores.

Drilling Engineer / Morten Laget


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DNO
5922 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 11/09/2023 The BHA took weight on the way down in open hole. Had to ream down on several of the core runs. On . . .

Drilling Engineer / Morten Laget


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DNO
5908 – DNO

Deepsea Yantai Operational 25/7-11 S
Norma
Reservoir section 05/09/2023 Wireline crew informed in the lesson learned meeting that it was some confusion on when to fire jar . . .

Drilling Engineer / Morten Laget


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DNO
5910 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 05/09/2023 High gas in return and losses. Believed to be due to ballooning effect. Once the well was flow . . .

Drilling Engineer / Morten Laget


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DNO
5911 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 05/09/2023 Time drill to initiate KO with 2 m/hr. Good performance kicking off from mainbore, no problems

Drilling Engineer / Morten Laget


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DNO
5906 – DNO

Deepsea Yantai Operational 25/7-11 S
Norma
Reservoir section 03/09/2023 The primary MDT tool and BU failed. A additional MDT tool was mobilized from Deepsea Stavanger.

Drilling Engineer / Morten Laget


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DNO
2094 – DNO

Borgland Dolphin Logistics
Own Experience
Operational 2/5-15
Gomez
Reservoir section 23/08/2021 Prior to mobilization of 8-1/2″ BHA, Coring and Wireline tools we held a aligmnement meeting to . . .

Johan Kjos-Hanssen


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DNO
1346 – DNO

Borgland Dolphin Subsurface
PSA Q&A
Planning A-1 H, A-2 H, A-3 HT2
Oselvar
Reservoir section 11/02/2021

Det vil bli tatt prøver av gassbobler i forbindelse med marine operasjoner i forkant av oppstart . . .

Karina Helle / Morten Laget


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