Lessons Learned749

New report

Operator	Rig	Discipline / Origin	Project Phase	Well	Section	Date	What Happened
Wellesley 5145 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Intermediate section	16/04/2023	FIT was a success. Shaved off 1.75 hrs compared to the test at 20″ shoe. 2.5 hrs vs 0.75 hrs. . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5144 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	16/04/2023	NPT: 1.25 hrs Cost: 260 417 NOK Repaired hydraulic leak on PS-30 slips. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5143 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	16/04/2023	NPT: 1.25 hrs Cost: 260 417 NOK Downtime due to reaming and reduced ROP. Drilled stand from . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5142 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	14/04/2023	NPT: 0.75 hrs Cost: 156 250 NOK Downtime due to Work String/Jar/Stuck Equipment. Freed stuck . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5141 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Intermediate section	13/04/2023	Not approved pressure test. Downtime to drilling contractor. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5140 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	13/04/2023	NPT: 0.75 hrs Cost: 156 250 NOK Observed poor make-up of jt #204 into jt #111: – No shoulder . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5139 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	13/04/2023	NPT: 1.25 hrs Cost: 260 417 NOK Performed mechanical repair on make/break cylinder on casing . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5138 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	13/04/2023	Total NPT: 11.25 hrs Cost: 2 343 750 NOK LARS lost communication with SubSea pump. Troubleshot . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5134 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	10/04/2023	It was difficult to stab in the 20″ casing joints with 15 ft bails and rig movement Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5124 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	10/04/2023	Run mud mat with buoyancy marker. Mud mat covered in soil after completing RMR operation Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5125 – Wellesley	Deepsea Yantai	Subsea	Operational	35/10-10S Carmen	Top hole	10/04/2023	When opening the trawl protector with the ROV, one of the locking pins fell off. It was recovered to . . . Lene Lomeland / Morten Laget	PDF Edit
Wellesley 5126 – Wellesley	Deepsea Yantai		Operational	35/10-10S Carmen	Top hole	10/04/2023	Ran mud mat from rig Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5127 – Wellesley	Deepsea Yantai	Drilling Own Experience	Operational	35/10-10S Carmen	Surface section	10/04/2023	Not enough deckspace to place shoe and sting-in float. Had to be laid in riser bay. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5128 – Wellesley	Deepsea Yantai	Logistics	Operational	35/10-10S Carmen	Surface section	10/04/2023	Logistical problems when Shoe track joints are placed on top of all other CSG on the boat. Shoetrack . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5130 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	10/04/2023	Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5133 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	10/04/2023	MWD/DD instructed drilling crew to break wrong connection when L/D 26″ BHA. As top part of assy was . . . Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5132 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	10/04/2023	Lubricated OOH with 26″ BHA with 2000 lpm Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5129 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	10/04/2023	The 26″ section was drilled with 4×20/32 nozzles. Bit some balled up. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5131 – Wellesley	No Rig	Drilling	Operational	No well	Surface section	10/04/2023	Difficulties passing 20″ CSG shoe through FMS. Engaged CRTi and pushed through. Drilling Engineer / Morten Laget	PDF Edit
Wellesley 5122 – Wellesley	Deepsea Yantai	Drilling	Operational	35/10-10S Carmen	Surface section	09/04/2023	The shoetrack was made up to 27,500 ft.lbs. Drilling Engineer / Morten Laget	PDF Edit

Lessons Learned749

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