WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
6455 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-12 S
Gnomoria
P&A 05/07/2024 Observed flowback of the mud lost while running and cementing 9 5/8″ casing. Of ±200 m3 of mud lost, . . .

Drilling Engineer / Morten Laget



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Wellesley
6456 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-12 S
Gnomoria
P&A 05/07/2024 Discussion about the risk of accidentally pulling the seal assembly free (no outer lock ring . . .

Drilling Engineer / Morten Laget



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Wellesley
5936 – Wellesley

Deepsea Yantai Marine
Own Experience
Operational 35/10-10S
Carmen
CAN-Ductor 23/10/2023 Risk of WOW during Carmen CAN-Ductor installation and recovery leading to Wellesley being . . .

Stian Engvik / Morten Laget


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Wellesley
5185 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Reservoir section 18/05/2023 On second MDT got stuck with Saturn packer and had to release electrical cable head and fish . . .

Drilling Engineer / Morten Laget


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Wellesley
5173 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 Crew not participating in the pre-job meeting but involved in L/D core.

Drilling Engineer / Morten Laget


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Wellesley
5175 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 Followed the HPHT manual for fingerprinting. Fingerprinter found some improvement point to the . . .

Drilling Engineer / Morten Laget


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Wellesley
5143 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 16/04/2023
NPT: 1.25 hrs
Cost: 260 417 NOK
Downtime due to reaming and reduced ROP.
Drilled stand from . . .

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
5142 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 14/04/2023
NPT: 0.75 hrs
Cost: 156 250 NOK
Downtime due to Work String/Jar/Stuck Equipment.
Freed stuck . . .

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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Wellesley
5126 – Wellesley

Deepsea Yantai Operational 35/10-10S
Carmen
Top hole 10/04/2023 Ran mud mat from rig

Drilling Engineer / Morten Laget


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Wellesley
5130 – Wellesley

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

Drilling Engineer / Morten Laget


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Wellesley
5132 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 10/04/2023 Lubricated OOH with 26″ BHA with 2000 lpm

Drilling Engineer / Morten Laget


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Wellesley
5133 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 10/04/2023 MWD/DD instructed drilling crew to break wrong connection when L/D 26″ BHA. As top part of assy was . . .

Drilling Engineer / 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
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
2324 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
Top hole 24/12/2021
30″ conductor and cement was cleaned out with seawater and sweeps, hole displaced to 1.40 SG . . .

Drilling Supervisor / Morten Laget


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Wellesley
1365 – Wellesley

Borgland Dolphin Marine
Own Experience
Operational 6204/11-3
Schweinsteiger
Rig move 09/03/2021 Two(2) harbour tugs were contracted by Dolphin Drilling to assist in holding Borgland Dolphin . . .

Stian Engvik / Morten Laget



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Wellesley
554 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 21/09/2020
Not able to load barite due to long transfer lines when loading on starboard side.
Bentonite ended . . .

Drilling Supervisor


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Wellesley
555 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 21/09/2020 Took onboard 90 m3 ready mixed kill mud in Stolsfjorden

Drilling Supervisor


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