WE Report

Lessons Learned

Lessons Learned865


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

DNO
8480 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Intermediate section 24/03/2025 Commander 1000 is a very heavy CMT-head. Due to its weight, it is not preferable to use on DSY . . .

Sander Schaathun / Stig Seland


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DNO
8482 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 24/03/2025 Very well executed and all objectives was met.

Sander Schaathun / Stig Seland


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DNO
8483 – DNO

Deepsea Yantai HSEQ Operational 35/10-13
Kjøttkake
P&A 24/03/2025 When cementer was dropping/pushing CST into DP filled with OBM “splashed” out of pipe and spilled on . . .

Sander Schaathun / Stig Seland


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DNO
8433 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
Production section 15/03/2025 Not able to get BOP test – Burst seal on CHSART

Ole Marius Serigstad / Stig Seland


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DNO
8394 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 35/10-13
Kjøttkake
Production section 07/03/2025 KOP set on ACST tool above 9 5/8” casing cut at ~1192 m to 1051 m (47 m inside 20” casing – shoe at . . .

Ole Marius Serigstad / Stig Seland


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DNO
8379 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
04/03/2025 After what we though was a successful NBP install, the NBP was still attached to the MPT when tool . . .

Stein-Petter Slatlem


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DNO
8380 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
P&A 04/03/2025 Indication of cut was not recognized. Decided to POOH and run in with B/U cutting eq. with marine . . .

Sander Schaathun / Stig Seland


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DNO
8381 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
P&A 04/03/2025 When cutting the 9 5/8” casing with low flow / pressure, the parameters spiked / fluctiated. When . . .

Sander Schaathun / Stig Seland


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DNO
8382 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
P&A 04/03/2025
Lost rubber drill pipe wiper downhole.
After pulled out with the cement stinger and when changing . . .

Sander Schaathun / Stig Seland


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DNO
8383 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
P&A 04/03/2025 The swedge that arrived the rig had a XO. When setting a Kelly cock on the swedge the total length . . .

Sander Schaathun / Stig Seland


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DNO
8327 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 20/02/2025 Wrong lineup of hydraulic hoses from shore.

Stein-Petter Slatlem


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DNO
8328 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 20/02/2025 Having KCL level at 200 kg/m3 was a success factor to drilling section.

Stein-Petter Slatlem


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DNO
8323 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 1” flowmeter hose burst causing spillage of OBM in the cement unit, while bleeding off during the . . .

Sander Schaathun / Stig Seland


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DNO
8324 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 MWD spent nightshift to program and confirm BHA. In the morning hours, it turns out that the plan . . .

Sander Schaathun / Stig Seland


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DNO
8325 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 Due to upcoming bad weather we needed to set the plug using IO support.

Sander Schaathun / Stig Seland


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DNO
8326 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Reservoir section 19/02/2025 Needed to build a drilling pup for coring using a balldrop sub.

Sander Schaathun / Stig Seland


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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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DNO
8260 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 14/02/2025 Deep seat bucket takes a lot of rig time to install on drillfloor.

Drilling Engineer


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DNO
8261 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 14/02/2025 Observed pressure increase during CMT operation.

Drilling Engineer


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DNO
8262 – DNO

Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake
Surface section 14/02/2025
Deployed SMO on winch. ED’s recommendation is to run on DP. It was difficult to hold correct . . .

Drilling Engineer


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