Lessons Learned749

New report

Operator	Rig	Discipline / Origin	Project Phase	Well	Section	Date	What Happened
Wellesley 5937 – Wellesley	Deepsea Yantai	Drilling Own Experience INTERNAL	Operational	35/10-10S Carmen	Other	24/10/2023	During operation several MoC’s were made. A link to the risk register was enclosed in the MoC . . . Åse Kristin Pettersen	PDF Edit
Wellesley 5936 – Wellesley	Deepsea Yantai	Marine Own Experience	Operational	35/10-10S Carmen	CAN-Ductor	23/10/2023	Risk of WOW during Carmen CAN-Ductor installation and recovery leading to Wellesley being . . . Stian Engvik / Morten Laget	PDF Edit
DNO 5927 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	N/A	19/09/2023	Mud cooler was used frequently throughout the wells. It was mobilized during Eirik and rigged up . . . John Langelandsvik / Morten Laget	PDF Edit
DNO 5912 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	N/A	06/09/2023	Plugging of transfer lines when taking Microbar from vessels several times. John Langelandsvik / Morten Laget	PDF Edit
DNO 5870 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma		31/07/2023	Due to build up of cuttings around the wellhead after drilling pilot hole the marker buoys was . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5862 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	When displacing the 26″ hole at TD a large volume of WBM was needed. And due to VDL the mud column . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5852 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	The pH meter showed indications of cement in return (pH value of 11.6-12.3). Due to poor visibility . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5853 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	After the cement of the 30″ conductor was set up the WHRT was released and POOH. Movement was seen . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5856 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	Used the ROV dredging around the conductor after drilling the 9 7/8″ Pilot hole. The cleaning with . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5857 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	Due to problems with cement around the conductor and movement in conductor a clamp-on inclinometer . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5858 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	Due to problems with cement around the conductor and movement in conductor a Bullseye bracket from . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5860 – DNO	Deepsea Yantai	Drilling Own Experience	Planning	25/7-11 S Norma	Top hole	30/07/2023	One of the stop collars fell of when it was picked up from the boat. When laying down the . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5861 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	Difficult to see cement in return due to poor visibility at seabed. pH sniffer indicated cement in . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5869 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Surface section	30/07/2023	From the start of the section after the FIT, delivery of cuttings to the ISO tanks using the CCBs . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5868 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Surface section	30/07/2023	The drill commenced with the Driller pressuring up the well with 30 bar. The classic method of . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5866 – DNO	Deepsea Yantai	Drilling Own Experience	Planning	25/7-11 S Norma	Surface section	30/07/2023	Difficulties with logistics to separate the joints below 11.5 m and the joints longer due to limited . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5863 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Top hole	30/07/2023	Everything went according to plan, no hole problems. Not much mud left. Drilling Engineer / Morten Laget	PDF Edit
DNO 5865 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Surface section	30/07/2023	Problems in start of 17 1/2″ Section with plug in blower system to ISO tanks. Few skips in field. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5845 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	P&A	12/07/2023	Pulled casing hanger with upper annular closed and C&K lines closed. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5844 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10 A Carmen	Production section	10/07/2023	Needed several trips with the tool up in the casing to cool it down. Drilling Engineer / Morten Laget	PDF Edit

Lessons Learned749

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