WE Report

Lessons Learned

Lessons Learned865


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

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
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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Wellesley
5123 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 09/04/2023 The centralizers was placed close to the bottom of the casing joint and was difficult to handle on . . .

Drilling Engineer / Morten Laget


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Wellesley
5113 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Top hole 30/03/2023 Installation took about 0,5-0,75 hr rigtlme due to conductor movement and work above sea. . . .

Sander Schaathun / Morten Laget


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Wellesley
5114 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Intermediate section 30/03/2023 Experienced higher pore pressure earlier than expected. Had enough to weight up active from 1,44 to . . .

Sander Schaathun / Morten Laget


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Wellesley
5115 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Production section 30/03/2023 If we are leaning to one of the sides it is easy to hang up in something which can result in a . . .

Sander Schaathun / Morten Laget


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Wellesley
5116 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Reservoir section 30/03/2023
Change of slips due to damage of pump in sub connection.
Due to the low ROP the pump in sub side . . .

Sander Schaathun / Morten Laget


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Wellesley
5112 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Reservoir section 29/03/2023 Did not provide desired slug effect.

Sander Schaathun / Morten Laget


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PGNiG
4946 – PGNiG

Deepsea Yantai Drilling
Experience Transfer Meeting
Operational 6608/1-1 S
Copernicus
Production section 03/11/2022
The gas readings for the 12 ¼” was done very well, and the correlation was quite good between the . . .

Richard Mollison



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PGNiG
4951 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1
Copernicus
N/A 26/09/2022 The Electrician was called and he found a loose wire (norwegian: fase) inside one of the . . .

Steinar Aarnes



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PGNiG
4913 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
P&A 23/09/2022 When pulling the conductor there was no cement stuck to it due to use of protane wrapping on the . . .

Drilling Engineer / Morten Laget


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