WE Report

Lessons Learned

Lessons Learned865


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

DNO
5865 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 30/07/2023 Problems in start of 17 1/2″ Section with plug in blower system to ISO tanks. Few skips in field.

Drilling Engineer / Morten Laget


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DNO
5866 – DNO

Deepsea Yantai Drilling
Own Experience
Planning 25/7-11 S
Norma
Surface section 30/07/2023 Difficulties with logistics to separate the joints below 11.5 m and the joints longer due to limited . . .

Drilling Engineer / Morten Laget


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DNO
5867 – DNO

Deepsea Yantai Subsurface
Own Experience
Operational 25/7-11 S
Norma
Surface section 30/07/2023 New version of the Gravitas earlier used. The WSG not used to the new version.

Drilling Engineer / Morten Laget


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DNO
5868 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 30/07/2023
The drill commenced with the Driller pressuring up the well with 30 bar.
The classic method of . . .

Drilling Engineer / Morten Laget


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DNO
5869 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 30/07/2023 From the start of the section after the FIT, delivery of cuttings to the ISO tanks using the CCBs . . .

Drilling Engineer / Morten Laget


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Wellesley
5835 – Wellesley

Deepsea Yantai Drilling
Own Experience
Planning 35/10-10S
Carmen
Surface section 16/06/2023 Crossovers supplied were of very different lengths: 4m, 6m and 12m.

Drilling Engineer / Morten Laget


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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


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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
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
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
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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