WE Report

Lessons Learned

Lessons Learned865


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

PGNiG
8271 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 The centralizer placement on the 20” interfered with the rollers on the casing tong.

Drilling Engineer


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PGNiG
8272 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 Not able to sting in CRTi to XO joint due to smaller ID.

Drilling Engineer


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PGNiG
8273 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 15/02/2025 SMO stickup higher than what was communicated in DOP. Caused issues regarding visual confirmation of . . .

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
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
8268 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 MW keeps increasing, having to add a lot of premix. Ran short on premix and had to mix in water to . . .

Drilling Engineer


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PGNiG
8269 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 Tight spots which required up to 25 MT overpull to pull above.

Drilling Engineer


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PGNiG
8270 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Surface section 14/02/2025 Due to bad weather and rig movement, it was evaluated and decided to install CRTi to be able to . . .

Drilling Engineer


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PGNiG
4911 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
Surface section 20/09/2022
10-15 ton OP while pulling out of open hole.
Bit and stabs balled up / clay

Drilling Engineer / Morten Laget


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PGNiG
4904 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
Surface section 15/09/2022 The cement swivel was delivered with the wrong threads. Delivered with NC50, should been XT57.

Drilling Engineer / Morten Laget


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PGNiG
4949 – PGNiG

Deepsea Yantai Drilling Operational 6608/1-1 S
Copernicus
Surface section 15/09/2022
After landing the 18 3/4″ LPWHH, the RT would not release from the WH. Several times they attempted . . .

Richard Mollison


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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
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
343 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 Unable to locate XO sub (DC58/TT550 NOV/Intelserv) offshore for 17 ½” BHA. New crossover had to be . . .


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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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PGNiG
346 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 IKM MRR: missing hoses between LARS and 90 degrees flowbend topside. Backloaded by Mi Swaco.


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PGNiG
347 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 Exhaust from IKM generator causing fumes and issues being in cement office


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PGNiG
348 – PGNiG

Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek
Surface section 22/10/2019 XBAT was run on 17 1/2″ BHA regardless.


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