WE Report

Lessons Learned

Lessons Learned865

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

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
180 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Surface section 05/02/2019 Took time POOH from TD. Pulled straight to 15 MT overpull, worked same. Thereafter lubricated with . . .


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Wellesley
181 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Surface section 05/02/2019 The 13 3/8″ casing was run to 2 m above the land off depth for 18 3/4″ WH. Circulated 1.5 x BU with . . .


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Wellesley
182 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Surface section 05/02/2019 When pumping drillwater out of the cement unit displacement tank, the pump sucked air, and delivered . . .


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Wellesley
194 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 The stop ring for balloon centralizer on the inner string cmt stinger was installed on top of . . .


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Wellesley
195 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 The WHIM or “funnel” on the seabed for pumping mud up to the rig, filled up with gumbo and large . . .


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Wellesley
196 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 N/A


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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
199 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 The Franks CRTi tool was made up to top drive before csg entered OH. With the water depth and OH . . .


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Wellesley
200 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 Disadvantage of using MRR system: Drilling top hole with reactive clay formations using mud will . . .


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DNO
309 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Surface section 07/01/2019 Not able to use the IRN to MU the motor assembly to the ARC-9 assembly due to short distance between . . .


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DNO
310 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Surface section 07/01/2019 Not optimal cement recipe, needed 25 min to clean tanks between lead and tail slurry.


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DNO
311 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Surface section 07/01/2019 Cement slurry was changed to a gas-tigh slurry due to encountering shallow gas in pilot hole. Due to . . .


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Faroe
159 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 Surface section 28/09/2017 Painted lengths on 13 3/8″ casing from town was actual lengths, not M/U lengths. This might cause . . .


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Faroe
160 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 Surface section 28/09/2017 During M/U 18 3/4″ WHH, threads got cross threaded from side to side when moving the 18 3/4″ WHH. . . .


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