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
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
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
Wellesley 5837 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Surface section	16/06/2023	Pups could not be run from aux using the “handshake” technique (too short for the Hydraracker) and . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5833 – Wellesley	Deepsea Yantai	Other	Operational	35/10-10S Carmen	N/A	13/06/2023	Unable to lift the BOP elevator with LMRP past fixed guide/bumper beams in moonpool. LMRP diameter . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5186 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Reservoir section	20/05/2023	Drilled 8 1/2″ section with 5 7/8″ DP with 1400-1500 lpm and low ROP, saw ECD up to 18 points. MW . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5185 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Reservoir section	18/05/2023	On second MDT got stuck with Saturn packer and had to release electrical cable head and fish . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5184 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Reservoir section	18/05/2023	Managed to fish roughly 1/2 of junk in hole that accumulated in junk basket (some was seen over . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5176 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Reservoir section	08/05/2023	When coring 54 m cores, during connection the kick stand was removed a single joint was connected . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5175 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Reservoir section	08/05/2023	Followed the HPHT manual for fingerprinting. Fingerprinter found some improvement point to the . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5174 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Reservoir section	08/05/2023	Treated the mud for the second and subsequent runs circulating BU after cutting cores. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5173 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Reservoir section	08/05/2023	Crew not participating in the pre-job meeting but involved in L/D core. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5171 – Wellesley	Deepsea Yantai		Operational	35/10-10S Carmen	N/A	06/05/2023	The BOP test tool was not ready to run. No DQ onboard and no status on the tool before they left the . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5161 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Reservoir section	26/04/2023	Weighted up the mud by mixing in a heavier mud. The volume of heavier mud can partially compensate . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5157 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Production section	24/04/2023	It was done before the cementer got the change to da a pre-job check / install bypass baffle etc. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5158 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Reservoir section	24/04/2023	NPT: 7.75 hrs Cost: 1 614 000 NOK Cyber chair stopped functioning. On Odfjell. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5160 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Production section	24/04/2023	Lube mud had 1.34 sg when taken up. Needed to weight it down to ± 1.25 sg. New lube mud for 12 . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5159 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Production section	24/04/2023	Downtime due to reduced ROP after going to max ROP of 75 m/hr: – Started with 30 m/hr – Jumped up . . . Drilling Engineer / Morten Laget	PDF Edit

Lessons Learned749

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