WE Report

Lessons Learned

Lessons Learned865


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

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
8274 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Run Riser and BOP 15/02/2025 Slip joint seal not engaged during diverter test to check for leak.

Drilling Engineer


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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
8277 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Intermediate section 15/02/2025 Losses and pack off during the circulation. Total losses in the end with 100 lpm.

Drilling Engineer


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PGNiG
8278 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Intermediate section 15/02/2025 The deck tally was made without the mitsui numbers, so not possible to control check the lengths. . . .

Drilling Engineer


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PGNiG
8279 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Intermediate section 15/02/2025 During 13 3/8” CSG job, the tong derailed a few times.

Drilling Engineer


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PGNiG
8280 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Intermediate section 15/02/2025 The middle of the cement job was pumped with wrong additives concentration – extra retarder was . . .

Drilling Engineer


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PGNiG
8281 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Production section 15/02/2025 Installed brackets on OWS tong after derailing during 13 3/8″ job.

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
8286 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
Reservoir section 15/02/2025 The weather forecasts are very unreliable, there are often discrepancies between the models. Which . . .

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
8288 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
P&A 15/02/2025 Could not find BHAs in drilling program

Drilling Engineer


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PGNiG
8289 – PGNiG

Deepsea Yantai Drilling Operational 6501/10-1
Tomcat
P&A 15/02/2025 Cutting job planned with long knives to ensure ability to cut through casing joints in case of . . .

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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DNO
8259 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
N/A 14/02/2025 HLB has provided a Commander 1000 cement head for launching darts and is to be used for the entire . . .

Drilling Engineer


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