WE Report

Lessons Learned

Lessons Learned865

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

Wellesley
183 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Production section 05/02/2019 Drilled stab-in float collar in only 50 minutes, but used 3.5 hrs to drill shoe, which is more than . . .


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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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Wellesley
191 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019


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Wellesley
197 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 A large volume (350 m3) bentonite mud was mixed before running casing for filling casing, emergency . . .


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Wellesley
198 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 Had trouble making up casing correctly due to movement of casing in slips. Had to back out several . . .


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Wellesley
204 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 05/02/2019 Coating from 9 5/8″ casing blocked dices on Franks casing tong (upper jaws). Had to frequently clean . . .


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DNO
320 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Great care taken breaking circulation at casing TD/washing down to land off. Used 100 lpm steps, . . .


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DNO
321 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 High values of LOT/FIT expected; 1.95 sg EMW. Value of ESD measured by LWD tool ahead of FIT was . . .


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Faroe
277 – Faroe

 		Transocean Arctic Drilling Operational 30/6-30
Rungne		 Reservoir section 01/01/2019 Made first connection on core BHA #3. This 64 m core BHA would require 2 connections on bottom. . . .


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Faroe
278 – Faroe

 		Transocean Arctic Drilling Operational 30/6-30
Rungne		 Reservoir section 01/01/2019 During POOH with coring assembly #3, took 70 mt overpull at 3250 m. After pulling further 9 m, got a . . .


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Faroe
169 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 P&A 28/09/2017 In DOP for pulling 9 5/8″ seal assembly, it was planned “Pick up with 3 ton overpull to check MPT . . .


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Faroe
170 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Intermediate section 28/09/2017 During displacement from WBM to OBM (while drilling out cement), attempted to u-tube kill and choke . . .


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Faroe
174 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Reservoir section 28/09/2017 When logging the 9 5/8” casing cement it was discovered during a repeat pass that the cement logs . . .


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DNO
1231 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 06/06/2012 DONG handover documentation: The OCG 15 section 8.51 states to pump TSW when pressure testing the . . .

Use normal SW, this is available at the cement unit. The fluid will anyway be bleed back after . . .
Karina Helle / Morten Laget


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DNO
1229 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 12/05/2012 DONG handover documentation: Confusion due to joints marked with two different joint numbers (in . . .

If reuse of pipe: Hide old joint number with paint and mark with new number. Use either white or . . .
Karina Helle / Morten Laget


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DNO
1230 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 12/05/2012 DONG handover documentation: Again challenges where seen due to backflow when RIH on DP / HWDP. . . .

In future include a flapper valve in the running string. Either below hanger setting tool (just . . .
Karina Helle / Morten Laget


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DNO
1228 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 11/05/2012 DONG handover documentation: When drilling 8-1/2″ with 9-1/4″ underreamer a section of the hole was . . .

When circulating at TD, position string so calliper can verify ID’s above and below UR shoulder. If . . .
Karina Helle / Morten Laget


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DNO
1222 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature.
Karina Helle / Morten Laget


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DNO
1224 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature. Alternative larger coolers on . . .
Karina Helle / Morten Laget


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DNO
1226 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: The deactivation of the underreamer was not done on the bit trip due to . . .

Do not spend time deactivating unless circulating at the shoe for another reason (conditioning mud). . . .
Karina Helle / Morten Laget


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