WE Report

Lessons Learned

Lessons Learned865


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

PGNiG
8275 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Run Riser and BOP 15/02/2025 Variable readings on bullseye.

Drilling Engineer


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PGNiG
8276 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Intermediate section 15/02/2025 Stabilizer to close to pin end – not able to make up with hydra tong. Had to use rig tongs.

Drilling Engineer


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PGNiG
8282 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Production section 15/02/2025 Use an updated CRTi tool with active set function.

Drilling Engineer


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PGNiG
8283 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Reservoir section 15/02/2025 The BU float subs sent out for the operation had wrong/undesired OD. The BU float subs sent out was . . .

Drilling Engineer


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PGNiG
8284 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Reservoir section 15/02/2025 No stethoscope run in the 8 ½” section.

Drilling Engineer


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PGNiG
8285 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 Set HAL suspension plug as pr HAL manual, plug depth +- 593 m. Pressure tested plug to 290 bar/10 . . .

Drilling Engineer


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PGNiG
8287 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Reservoir section 15/02/2025 The overshot initially was not sent out with the Ardyne fishing basket. The overshot was planned out . . .

Drilling Engineer


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PGNiG
8290 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
P&A 15/02/2025 Primary cutter was tempest backup cutter was conventional with marine swivel. Lack of annular swivel . . .

Drilling Engineer


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PGNiG
8266 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 Had to run SMO on pipe due to too much heave.

Drilling Engineer


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PGNiG
8205 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 03/02/2025 Protan AM sleeve came sliding down after making up connection on 36” WHH. Joint and conductor string . . .

Drilling Engineer


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PGNiG
8206 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Top hole 03/02/2025 Fiberglass inner string broke off due to strong currents.

Drilling Engineer


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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
4909 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
Top hole 19/09/2022 The SMO level sensor did not function in auto operation. Was operated manually. Enhanced made a . . .

Drilling Engineer / Morten Laget


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PGNiG
4950 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
Surface section 15/09/2022 The box end of the 13 3/8″ no cross coupling is too long to allow the use of the casing running tool . . .

Richard Mollison


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PGNiG
4846 – PGNiG

Deepsea Yantai Logistics Operational 6608/1-1 S
Copernicus
Reservoir section 12/09/2022 The BU GVR MWD tool for 8 1/2″ section not at site when drilling the section. The near bit . . .

Drilling Engineer / Morten Laget


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PGNiG
4835 – PGNiG

Deepsea Yantai Drilling
Own Experience
Operational 6608/1-1 S
Copernicus
Surface section 04/09/2022
When the rig reached a TD of 1100 m and no contingency 4-string design was needed anymore, the 20″ . . .

Drilling Engineer / Morten Laget


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PGNiG
4765 – PGNiG

Deepsea Yantai Drilling
Own Experience
Planning Copernicus Surface section 23/08/2022 The use of normal HWDP Requires double handling from fingerboard to well center when running and . . .

Richard Mollison / Morten Laget


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PGNiG
344 – PGNiG

Deepsea Nordkapp Drilling
INTERNAL
Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 WDP did not enhance the Shrek drilling operations in any significant capacity


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PGNiG
345 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 IKM MRR 300 system (modified in lack of 500 system), failed to deliver adequate flow (3500lpm), . . .


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