Lessons Learned749

New report

Operator	Rig	Discipline / Origin	Project Phase	Well	Section	Date	What Happened
DNO 5909 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	P&A	05/09/2023	Due to high percentage of gas in the mud return the interface had to go over the shaker system and . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5839 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Intermediate section	20/06/2023	The cement didn’t set up as expected. Drilling Engineer / Morten Laget	PDF Edit
PGNiG 4901 – PGNiG	Deepsea Yantai	Drilling	Operational	6608/1-1 S Copernicus	P&A	14/09/2022	The heating cabinet in the logging unit does not work as required, not able to change the . . . Drilling Engineer / Morten Laget	PDF Edit
INEOS 3405 – INEOS	Borgland Dolphin	Drilling Own Experience	Operational	PL937 Fat Canyon	Top hole	02/10/2021	A 30 m3 viscous freshwater spacer was pumped ahead of the cement to avoid contamination from sea . . . /	PDF Edit
DNO 2108 – DNO	Borgland Dolphin	Drilling Own Experience	Operational	2/5-15 Gomez	Intermediate section	05/09/2021	The PAB system failed before the cement job due to water ingress inside the unit which caused some . . . Drilling Supervisor / Morten Laget	PDF Edit
DNO 2013 – DNO	Borgland Dolphin	Drilling Experience Transfer Meeting	Operational	2/5-15 Gomez	Top hole	14/08/2021	From among cementers it was decided to disconnect the dust collector before this job. The surge . . . What does ETM mean? Drilling Supervisor / Morten Laget	PDF Edit
Wellesley 256 – Wellesley	Transocean Arctic	Drilling	Operational	35/4-2 Songesand	Production section	16/06/2020	The cement slurry for the 9 5/8″ casing was thick/sticky and caused cement pump suction problems . . .	PDF Edit
PGNiG 379 – PGNiG	Deepsea Nordkapp	Drilling	Operational	6507/5-9 S, 6507/5-9 A Shrek	Production section	22/10/2019	Cut of 9-5/8” casing close to/above uncemented weak sand interval (w/ minor 5% gas). Resulted in . . .	PDF Edit
PGNiG 386 – PGNiG	Deepsea Nordkapp	Drilling	Operational	6507/5-9 S, 6507/5-9 A Shrek	Production section	22/10/2019	Excellent cement performances throughout operations (except the first KOP due to losses, weak . . .	PDF Edit
Faroe 287 – Faroe	Transocean Arctic	Drilling	Operational	31/7-3 S Brasse	Top hole	02/10/2019	Had to lay out one joint of fibreglass innerstring due to not able to M/U connection. No visible . . .	PDF Edit
DNO 305 – DNO	Island Innovator	Drilling	Operational	6507/7-16 S Canela	Top hole	07/01/2019	Conductor set up early. Had to order out more dispersant chemicals for the 20″ cement job due to . . .	PDF Edit
DNO 306 – DNO	Island Innovator	Drilling	Operational	6507/7-16 S Canela	Top hole	07/01/2019	The cement design was updated with reduced lead and increased tail slurry to provide better support . . .	PDF Edit
DNO 308 – DNO	Island Innovator	Drilling	Planning	6507/7-16 S Canela	Pilot hole section	07/01/2019	Pilot hole drilled to TD before identifying shallow gas. Resulted in having to order out more . . .	PDF Edit
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.	PDF Edit
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 . . .	PDF Edit

Lessons Learned749

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