WE Report

Lessons Learned

Lessons Learned865


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

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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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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Wellesley
2321 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
Top hole 23/12/2021 o At 281m conductor couldn’t pass due to the tight spot observed when drilling there. Attempted to . . .

Drilling Engineer / Morten Laget


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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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Wellesley
556 – Wellesley

Borgland Dolphin Logistics Operational 6204/11-3
Schweinsteiger
Rig move 21/09/2020 19 persons booked transport by bus to Fedafjorden. Positive feedback from service companies and . . .

Johan Kjos-Hanssen


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Wellesley
1063 – Wellesley

Borgland Dolphin Logistics Operational 6204/11-3
Schweinsteiger
Top hole 15/09/2020 Rig Required extra Barite at short notice due to challenges in top hole. PSV delivered Approximately . . .

Johan Kjos-Hanssen


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Wellesley
498 – Wellesley

Borgland Dolphin 6204/11-3
Schweinsteiger
09/09/2020 Increased MW to 1.20 SG on bottom of 12 1/4″ section

Drilling Supervisor


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Wellesley
476 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 02/09/2020 Due to shallow gas zone at 331m, needed to fill casing with mud to be ready in case of need to wash . . .

Drilling Supervisor


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Wellesley
465 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 27/08/2020 Good suggestion from Dolphin not to do this as in past fibreglass tubing has broken due to vibration . . .

Drilling Supervisor


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Wellesley
234 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 S
Grosbeak West
Production section 16/06/2020 Good experience M/U 9 5/8″ VAM21 CWD2 joint with drilling bails rather than longer casing bails. . . .


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Wellesley
257 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 Drilled 2 x wiper plugs and landing collar in 45 minutes using a milled tooth rock bit. 300 litres . . .


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Wellesley
262 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 The Weatherford MOST tool was successfully used in rotary mode. The tool was dressed such that the . . .


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Wellesley
207 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 AxeBlade Bit performed well, did not create stick-slip.


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Wellesley
211 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 The pump strokes and volume pumped (from pit sensors) matched very well from 0-83 m3 mud pumped . . .


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Wellesley
212 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 All 3 wiper plug shears & burst were clearly seen during this cement job; bottom plug shear, top . . .


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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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Wellesley
187 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Reduced to 10 m3 which made a massive difference to the amount of slop generated and skips filled.


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Wellesley
190 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 TOA’s acoustic BOP pressure sensor was successfully used to monitor backpressure exerted on the well . . .


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