WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
5839 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Intermediate section 20/06/2023 The cement didn’t set up as expected.

Drilling Engineer / Morten Laget


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Wellesley
5840 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 It was run according to tally.

Drilling Engineer / Morten Laget


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Wellesley
5841 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 The CHSART was run with the pup sent out with the tool.

Drilling Engineer / Morten Laget


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Wellesley
5842 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 Had some stringer in the bottom of the 12 1/4″ Section and had to work the csg hgr w/seal assy up . . .

Drilling Engineer / Morten Laget


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Wellesley
5843 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 It was separated into two runs. The cup tester did not fit in the 9 7/8″ wearbushing installed in . . .

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
5141 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Intermediate section 13/04/2023 Not approved pressure test. Downtime to drilling contractor.

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
243 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Intermediate section 16/06/2020 The remote operated lo-torq valve was installed with an elbow between side inlet and lo-torq, while . . .


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Wellesley
244 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Intermediate section 16/06/2020 Making up cmt. Stand into landing string prior to landing 9 5/8″ casing was done by use of chain . . .


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