WE Report

Lessons Learned

Lessons Learned865


Operator Rig Discipline / Origin Project Phase Well Section Date What Happened

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


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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


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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


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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


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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


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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


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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



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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


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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


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Wellesley
5126 – Wellesley

Deepsea Yantai Operational 35/10-10S
Carmen
Top hole 10/04/2023 Ran mud mat from rig

Drilling Engineer / Morten Laget


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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


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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


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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


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Wellesley
5130 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 10/04/2023

Drilling Engineer / Morten Laget


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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


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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


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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


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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


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Wellesley
5135 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Surface section 10/04/2023 Difficult to install

Drilling Engineer / Morten Laget


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Wellesley
5136 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Surface section 10/04/2023 Overpull experienced trying to pull the WHRT clear of the Housing after release.

Drilling Engineer / Morten Laget


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