WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
5174 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 Treated the mud for the second and subsequent runs circulating BU after cutting cores.

Drilling Engineer / Morten Laget


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Wellesley
5161 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 26/04/2023 Weighted up the mud by mixing in a heavier mud. The volume of heavier mud can partially compensate . . .

Drilling Engineer / Morten Laget


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Wellesley
5159 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Production section 24/04/2023
Downtime due to reduced ROP after going to max ROP of 75 m/hr:
– Started with 30 m/hr
– Jumped up . . .

Drilling Engineer / Morten Laget


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Wellesley
5160 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Production section 24/04/2023
Lube mud had 1.34 sg when taken up.
Needed to weight it down to ± 1.25 sg.
New lube mud for 12 . . .

Drilling Engineer / Morten Laget


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Wellesley
5114 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Intermediate section 30/03/2023 Experienced higher pore pressure earlier than expected. Had enough to weight up active from 1,44 to . . .

Sander Schaathun / Morten Laget


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Wellesley
259 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 The cold temperature in the riser and 300 m below seabed made the WBM more viscous than under normal . . .


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Wellesley
179 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 The cuttings were encapsulated with mud, very little hydration, dry and crisp inside.


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