WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
248 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Reservoir section 16/06/2020 Max flowrate for extracting formation fluid with the FTWT tool was said to be 6-7 lpm. During this . . .


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Wellesley
261 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 After unlatching the BOP we forgot to remove the AX ring from the wellhead prior to pulling the BOP. . . .


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Wellesley
262 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 The Weatherford MOST tool was successfully used in rotary mode. The tool was dressed such that the . . .


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Wellesley
263 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 As on all previous wells, with the well displaced to seawater and wellhead cutting operations . . .


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Wellesley
208 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 The Halliburton BSS “skip & ship” system worked very well. There was no problem handling60 m/hr . . .


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Wellesley
209 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019


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Wellesley
215 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019


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Wellesley
216 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 After POOH with 8 1/2″ BHA (prior to coring), decided to not run same due to wear on teeth coating. . . .


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Wellesley
217 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Junk was found in core barrel (piece of coiled copper plated spring steel). Possibly a piece of . . .


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Wellesley
219 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Galled monel connection on LWD string when POOH from initial TD 3102 m (between sonic and crossover . . .


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Wellesley
224 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 WOC for cement plugs in OBM prior to dressing off.


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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
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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