WE Report

Lessons Learned

Lessons Learned865

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

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
192 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Believed that the HP housing lock ring was not set or only partially set, alternatively it was . . .


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Wellesley
193 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Equipment sent out did not include specialized eq for cut and pulling 30″ and 20″ casing in case the . . .


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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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Wellesley
201 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 05/02/2019 Tried to shear OBM mud in pits before drilling the 12 1/4″ section. At this time the well and all . . .


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Wellesley
202 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 N/A 05/02/2019 Operating with 5 deck crew, as specified in the contract, does not allow for utilizing two deck . . .


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Wellesley
203 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 N/A 05/02/2019 Column tank ST3 which was previously used for brine storage has within the last two years been . . .


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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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Wellesley
205 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 05/02/2019 Double float valves in shoe failed at around 900 m, still inside 13 3/8″ casing. Mud flowed back . . .


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