WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
5137 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Surface section 10/04/2023

Drilling Engineer / Morten Laget


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Wellesley
5121 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 09/04/2023 Did not observe a shoulder making the casing up to 27 500 ft-lbs.

Drilling Engineer / Morten Laget


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Wellesley
5122 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 09/04/2023 The shoetrack was made up to 27,500 ft.lbs.

Drilling Engineer / Morten Laget


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Wellesley
5123 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 09/04/2023 The centralizers was placed close to the bottom of the casing joint and was difficult to handle on . . .

Drilling Engineer / Morten Laget


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Wellesley
5113 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Top hole 30/03/2023 Installation took about 0,5-0,75 hr rigtlme due to conductor movement and work above sea. . . .

Sander Schaathun / 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
5115 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Production section 30/03/2023 If we are leaning to one of the sides it is easy to hang up in something which can result in a . . .

Sander Schaathun / Morten Laget


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Wellesley
5116 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Reservoir section 30/03/2023
Change of slips due to damage of pump in sub connection.
Due to the low ROP the pump in sub side . . .

Sander Schaathun / Morten Laget


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Wellesley
5112 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Reservoir section 29/03/2023 Did not provide desired slug effect.

Sander Schaathun / Morten Laget


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Wellesley
4960 – Wellesley

Borgland Dolphin Logistics
Own Experience
End of Well 36/1-4
Hemispheres
Other 14/12/2022 Sevaral months after end of operation personnel on Saga Fjordbase found a full mudskip left after . . .

Johan Kjos-Hanssen / Morten Laget



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Wellesley
3373 – Wellesley

Borgland Dolphin Marine
Own Experience
Operational 36/1-4
Hemispheres
Rig move 18/02/2022 Uncontrolled runout of anchor and chain

Stian Engvik / Morten Laget



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Wellesley
3246 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
P&A 29/01/2022
Cement plug was pumped without incident, POOH through cement was without incident. Circulated clean . . .

Drilling Supervisor / Morten Laget



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Wellesley
3241 – Wellesley

Borgland Dolphin HSEQ
Own Experience
Operational 36/1-4
Hemispheres
N/A 28/01/2022 There was a dropped object (DO) incident onboard BGL, and DO is not included in the reporting & . . .

Anniken Meisler / Morten Laget


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Wellesley
4487 – Wellesley

Borgland Dolphin Logistics
Own Experience
Planning 36/1-4
Hemispheres
Other 15/01/2022 Another operator with the same rig chooses other vessels for a short well. Rig IDC, PSV’s not IDC . . .

Johan Kjos-Hanssen / Morten Laget



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Wellesley
2413 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
Surface section 04/01/2022
Ahead of a connection at 1146m (105m below the 13 3/8″ shoe), a blockage occurred in the cuttings . . .

Drilling Supervisor / Morten Laget


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Wellesley
2409 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
Top hole 01/01/2022 When making up 18 3/4″ WHH to No Cross joint it was very tight clearance for upper and lower jaws to . . .

Drilling Supervisor / Morten Laget


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Wellesley
2401 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
Production section 30/12/2021 ALL mud skips was put on the same boat, effectively removing any hope for recieving backload on said . . .

Drilling Engineer / Morten Laget


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Wellesley
2347 – Wellesley

Borgland Dolphin Logistics
Own Experience
Operational 36/1-4
Hemispheres
Top hole 28/12/2021
Saga Fjordbase took the 75ft riser joint and backloaded in addition to the 30″ conductor joints. The . . .

Drilling Engineer / Morten Laget


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Wellesley
2346 – Wellesley

Borgland Dolphin Logistics
Own Experience
Operational 36/1-4
Hemispheres
WELS/Kabal software 27/12/2021
Dolphin HR-personnel booked and moved people in WELS, then they confirmed them in WELS also, in . . .

Drilling Engineer / Morten Laget


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Wellesley
2326 – Wellesley

Borgland Dolphin Logistics
Own Experience
Operational 36/1-4
Hemispheres
Top hole 26/12/2021 The base and boat backloaded the primary and secondary 18 3/4″ WHHs instead of two 30″ conductor . . .

Drilling Engineer / Morten Laget


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