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Lessons Learned

Lessons Learned865

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

Wellesley
178 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Surface section 05/02/2019 ECD calculation in SG EMW done by the MWD softwaremight not be intuitive. The SG is normally . . .


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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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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
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
184 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Production section 05/02/2019 Had to lay out several joints due to missing threads on top of pin ends, (9 5/8″, #53.3, P-110, . . .


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Wellesley
185 – Wellesley

 		Transocean Arctic Logistics Operational 35/12-7
Serin		 Reservoir section 05/02/2019 Stethoscope tool became primary means of taking pressure acquisition. Initial 14 pressure points . . .


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Wellesley
186 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Halliburton recommended to rotate the string while setting the P&A plugs, but did not supply a . . .


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Wellesley
187 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Reduced to 10 m3 which made a massive difference to the amount of slop generated and skips filled.


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Wellesley
188 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Paintjob was not successful. All paint washed off during job.


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Wellesley
189 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Observed 3 1/2″ cmt. Stinger partially plugged with debris and cement on POOH after having set 4 . . .


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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
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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