WE Report

Lessons Learned

Lessons Learned865

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

DNO
8328 – DNO

 		Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake		 Surface section 20/02/2025 Having KCL level at 200 kg/m3 was a success factor to drilling section.

Stein-Petter Slatlem


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DNO
5919 – DNO

 		Deepsea Yantai Drilling Operational 25/7-11 S
Norma		 N/A 10/09/2023 Done as per plan. For the coring operations a new LCM pill was mixed. The LCM from the 8 1/2″ . . .

Drilling Engineer / Morten Laget


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Wellesley
5174 – Wellesley

 		Deepsea Yantai Drilling Operational 35/10-10S
Carmen		 Reservoir section 08/05/2023 Treated the mud for the second and subsequent runs circulating BU after cutting cores.

Drilling Engineer / Morten Laget


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Wellesley
5161 – Wellesley

 		Deepsea Yantai Drilling Operational 35/10-10S
Carmen		 Reservoir section 26/04/2023 Weighted up the mud by mixing in a heavier mud. The volume of heavier mud can partially compensate . . .

Drilling Engineer / Morten Laget


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Wellesley
5159 – Wellesley

 		Deepsea Yantai Drilling Operational 35/10-10S
Carmen		 Production section 24/04/2023
Downtime due to reduced ROP after going to max ROP of 75 m/hr:
– Started with 30 m/hr
– Jumped up . . .

Drilling Engineer / Morten Laget


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Wellesley
5160 – Wellesley

 		Deepsea Yantai Drilling Operational 35/10-10S
Carmen		 Production section 24/04/2023
Lube mud had 1.34 sg when taken up.
Needed to weight it down to ± 1.25 sg.
New lube mud for 12 . . .

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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PGNiG
4834 – PGNiG

 		Deepsea Yantai Drilling
Own Experience		 Planning 6608/1-1 S
Copernicus		 Other 04/09/2022 When running of 20″ x 13 3/8″ casing was planned to be on Sunday 4/9/22 we tried to get surge . . .

Drilling Engineer / Morten Laget


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INEOS
2273 – INEOS

 		Borgland Dolphin Logistics
Own Experience		 Operational 6306/3-1 S
Fat Canyon		 Production section 05/11/2021 During operation drilling did go slower than expected and way too often the boats has to go to the . . .

Drilling Engineer / Morten Laget


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DNO
1930 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 29/06/2021 We had a lot of friction in a long and deviated well A3 with brine.

Drilling Supervisor / Stig Seland



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Wellesley
259 – Wellesley

 		Transocean Arctic Drilling Operational 35/4-2
Songesand		 Reservoir section 16/06/2020 The cold temperature in the riser and 300 m below seabed made the WBM more viscous than under normal . . .


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PGNiG
368 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Drilled 8 1/2″ section with 1.30 sg MW. Based on LWD data from 12 ¼” the predicted PP in the 8 ½” . . .


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PGNiG
374 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Getting OBM sent out lith a low O/W ratio (70/30).


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PGNiG
385 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Production section 22/10/2019 Excellent mud performance throughout operations. Issues with O/W ratio due to topside issues.


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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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DNO
301 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 N/A 07/01/2019 DNO subsurface department wanted to use new OBM for drilling the sidetrack reservoir section.


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DNO
312 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Intermediate section 07/01/2019 The 17 1/2″ section was drilled, but it proved difficult to get hold of Glycol for the KCl mud.


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DNO
314 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Intermediate section 07/01/2019 KCl WBM was used for drilling the 17 1/2″ section to 1200 m. The hole was observed in good condition . . .


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DNO
315 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Intermediate section 07/01/2019 Had to increase MW from the planned 1.48 sg to 1.52 sg at TD due to cavings.


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DNO
316 – DNO

 		Island Innovator Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Drilled section with planned mud and mud weight without problems with cavings. Cavaings identified . . .


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