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
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
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
6766 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Both TFMC and Mitsui numbers marked on joints. TFMC rig numbers marked but with prefix TFMC making . . .

Lene Lomeland


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DNO
6767 – DNO

Nobel Invincible Logistics Planning 2/6-7 S
Falstaff
Top hole 23/09/2024 Excellent planning. Safely executed. Experienced and knowledgeable Expro crews who cooperated good . . .

Lene Lomeland


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Wellesley
6384 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-4 A
Gnomoria
Top hole 11/06/2024 RMR external adapter in place. Not possible to easily access profile and install VX gasket without . . .

Giacomo Bonomo / Morten Laget



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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
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
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
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
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
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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DNO
5867 – DNO

Deepsea Yantai Subsurface
Own Experience
Operational 25/7-11 S
Norma
Surface section 30/07/2023 New version of the Gravitas earlier used. The WSG not used to the new version.

Drilling Engineer / Morten Laget


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Wellesley
5145 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Intermediate section 16/04/2023 FIT was a success. Shaved off 1.75 hrs compared to the test at 20″ shoe. 2.5 hrs vs 0.75 hrs. . . .

Drilling Engineer / Morten Laget


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Wellesley
5124 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 10/04/2023 Run mud mat with buoyancy marker. Mud mat covered in soil after completing RMR operation

Drilling Engineer / Morten Laget


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PGNiG
4923 – PGNiG

Deepsea Yantai Logistics
Own Experience
Planning 6608/1-1 S
Copernicus
Other 03/10/2022 With this focus the mobilization plan became a live document and with a weekly focus, ensuring all . . .

Johan Kjos-Hanssen / Morten Laget



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PGNiG
4913 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
P&A 23/09/2022 When pulling the conductor there was no cement stuck to it due to use of protane wrapping on the . . .

Drilling Engineer / Morten Laget


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