Lessons Learned749

New report

Operator	Rig	Discipline / Origin	Project Phase	Well	Section	Date	What Happened
Wellesley 6059 – Wellesley	No Rig			No well	Surface section	21/12/2023	Drilling Engineer	PDF Edit
Wellesley 6060 – Wellesley	Deepsea Yantai			35/10-10S Carmen	Top hole	21/12/2023	Drilling Engineer	PDF Edit
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 5923 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Reservoir section	17/09/2023	While sampling the MDT Saturn probe got stuck. All attempts to free with wireline tension, cycling . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5924 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Reservoir section	17/09/2023	Side door overshot had to be run (provided by Archer with Archer-supplied procedures) Drilling Engineer	PDF Edit
DNO 5920 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	Reservoir section	11/09/2023	The cap rock was longer than anticipated, difference form mainbore. The core jammed off in the . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5921 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	Reservoir section	11/09/2023	Core jammed off on all 3 cores. Drilling Engineer / Morten Laget	PDF Edit
DNO 5922 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	Reservoir section	11/09/2023	The BHA took weight on the way down in open hole. Had to ream down on several of the core runs. On . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5919 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	N/A	10/09/2023	Done as per plan. For the coring operations a new LCM pill was mixed. The LCM from the 8 1/2″ . . . Drilling Engineer / 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 5911 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	Reservoir section	05/09/2023	Time drill to initiate KO with 2 m/hr. Good performance kicking off from mainbore, no problems Drilling Engineer / Morten Laget	PDF Edit
DNO 5910 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	Reservoir section	05/09/2023	High gas in return and losses. Believed to be due to ballooning effect. Once the well was flow . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5908 – DNO	Deepsea Yantai		Operational	25/7-11 S Norma	Reservoir section	05/09/2023	Wireline crew informed in the lesson learned meeting that it was some confusion on when to fire jar . . . Drilling Engineer / Morten Laget	PDF Edit
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
DNO 5906 – DNO	Deepsea Yantai		Operational	25/7-11 S Norma	Reservoir section	03/09/2023	The primary MDT tool and BU failed. A additional MDT tool was mobilized from Deepsea Stavanger. Drilling Engineer / Morten Laget	PDF Edit
DNO 5907 – DNO	Deepsea Yantai	Drilling	Operational	25/7-11 S Norma	P&A	03/09/2023	It was not clearly stated in the HLB cement program how the cement calculations should be carried . . . Drilling Engineer / Morten Laget	PDF Edit
DNO 5873 – DNO	Deepsea Yantai	Testing Own Experience	Operational	25/7-11 S Norma	Testing	11/08/2023	admin	PDF Edit
DNO 5872 – DNO	Deepsea Yantai	Drilling Own Experience	Operational	25/7-11 S Norma	Surface section	07/08/2023	the ROP is very slow ( 1-2 m/hr) after drilling approximately 1500 meters using XZ816 PDC bit. . . . Drilling Engineer / Morten Laget	PDF Edit

Lessons Learned749

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