WE Report

Lessons Learned

Lessons Learned865


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

DNO
5859 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Drawwork in landing mode. No change in hookload while cementing and displacing.

Drilling Engineer / Morten Laget


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DNO
5860 – DNO

Deepsea Yantai Drilling
Own Experience
Planning 25/7-11 S
Norma
Top hole 30/07/2023 One of the stop collars fell of when it was picked up from the boat. When laying down the . . .

Drilling Engineer / Morten Laget


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DNO
5861 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Difficult to see cement in return due to poor visibility at seabed. pH sniffer indicated cement in . . .

Drilling Engineer / Morten Laget


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DNO
5862 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 When displacing the 26″ hole at TD a large volume of WBM was needed. And due to VDL the mud column . . .

Drilling Engineer / Morten Laget


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DNO
5863 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 Everything went according to plan, no hole problems. Not much mud left.

Drilling Engineer / Morten Laget


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DNO
5864 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
BOP running 30/07/2023 Used two ROVs to guide the BOP on top of WHH. No problems.

Drilling Engineer / Morten Laget


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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
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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DNO
4761 – DNO

No Rig Drilling
Own Experience
Planning No well N/A 10/08/2022 In DG1-DG2 rig screening strategy the project landed on 1.5 or Dual derrick rig and all time and . . .

Zol Mollaeian / Sigve K. Næsheim


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DNO
2198 – DNO

Borgland Dolphin Drilling
Own Experience
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
P&A 04/10/2021 H2S had formed in the annulus fluid.

Lars Solvang / Stig Seland



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DNO
2130 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
P&A 19/09/2021 1 hr extra rig time was unnecessarily spent to make up x-over to the RT before it could be made up . . .

Drilling Supervisor / Morten Laget


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DNO
2108 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Intermediate section 05/09/2021
The PAB system failed before the cement job due to water ingress inside the unit which caused some . . .

Drilling Supervisor / Morten Laget


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DNO
2107 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Top hole 03/09/2021 Marker buoys too close to the hole, Fell inn and got drilled to bits. ROV use the marker buoys for . . .

Drilling Engineer / Morten Laget


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DNO
2106 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Surface section 31/08/2021
Drilled 12 ¼” hole with Smith XZ616 AxeBlade PDC bit from 1613 m to 2895 m in a vertical hole. . . .

Drilling Supervisor / Morten Laget


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DNO
2099 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Production section 29/08/2021
The NORM instrument was found finally found on the drillfloor, however in an unmarked black . . .

Drilling Engineer / Morten Laget


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DNO
2098 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Surface section 27/08/2021 Unable to set seal assembly after 13 3/8″ hanger was landed. Attempted several times to pressure up . . .

Drilling Supervisor / Morten Laget


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DNO
2096 – DNO

Borgland Dolphin Drilling
Own Experience
Operational 2/5-15
Gomez
Surface section 22/08/2021 DrilQuip MPT and BOP test tool was sent out without pup joints.

Drilling Supervisor / Morten Laget


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DNO
2013 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational 2/5-15
Gomez
Top hole 14/08/2021 From among cementers it was decided to disconnect the dust collector before this job. The surge . . .

What does ETM mean?
Drilling Supervisor / Morten Laget


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