WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
5163 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
29/04/2023 There is to much information in the DOP’s. Easy to miss out on important steps because they are . . .

Drilling Engineer / Morten Laget


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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


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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


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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


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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


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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


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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
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
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
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
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
5121 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 09/04/2023 Did not observe a shoulder making the casing up to 27 500 ft-lbs.

Drilling Engineer / Morten Laget


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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


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