WE Report

Lessons Learned

Lessons Learned865


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

DNO
8201 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 02/02/2025 Low ROP caused by worn out bit and balling.

Stein-Petter Slatlem / Stig Seland


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DNO
5872 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 07/08/2023 the ROP is very slow ( 1-2 m/hr) after drilling approximately 1500 meters using XZ816 PDC bit. . . .

Drilling Engineer / Morten Laget


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INEOS
2317 – INEOS

Borgland Dolphin Drilling
Own Experience
Operational 6306/3-1 S
Fat Canyon
Production section 09/12/2021
Extremely slow progress ranging from 1-10m/hr.
Likely due to sweeling/stickyness of clay due to use . . .

Steinar Aarnes / Morten Laget


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INEOS
3407 – INEOS

Borgland Dolphin Drilling
Own Experience
Operational PL937
Fat Canyon
Intermediate section 04/11/2021
ROP in 12 1/4″ section dropped to almost nothing at +/- 1900 m. Drilling parameters were varied, and . . .

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INEOS
2269 – INEOS

Borgland Dolphin Drilling
Own Experience
Operational 6306/3-1 S
Fat Canyon
Intermediate section 31/10/2021 ROP dropped from 50 m/hr to 1 m/hr

Drilling Supervisor / Morten Laget


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DNO
2106 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Surface section 31/08/2021
Drilled 12 ¼” hole with Smith XZ616 AxeBlade PDC bit from 1613 m to 2895 m in a vertical hole. . . .

Drilling Supervisor / Morten Laget


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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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Faroe
272 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Intermediate section 27/09/2019 Axebalde bit with v-shaped cutters drilled through most limestone stringers without any reduction in . . .


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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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DNO
313 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
Intermediate section 07/01/2019 The 17 1/2″ bit was damaged, when 45 mt WOB was experienced while drilling with large rig heave. . . .


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