WE Report

Lessons Learned

Lessons Learned865


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

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


PDF


Edit


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


PDF


Edit


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


PDF


Edit


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


PDF


Edit


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


PDF


Edit


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


PDF


Edit


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


PDF


Edit


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


PDF


Edit


DNO
6978 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
P&A 21/11/2024 Sat the EZSV and tagged with 6t and and overpull of 27t. Performed two pressure tests, but both . . .

Drilling Engineer


PDF


Edit


DNO
6967 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
P&A 11/11/2024 For plug #1D incorrect concentration of retarder was used in the cement mix – extending the . . .

Lene Lomeland


PDF


Edit


DNO
6969 – DNO

Nobel Invincible Drilling Planning 2/6-7 S
Falstaff
P&A 11/11/2024 Attempted to dress off cement after the sample in the UCA cell started to build compressive . . .

Lene Lomeland


PDF


Edit


DNO
6970 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Reservoir section 11/11/2024
When RIH with Whipstock/Milling BHA to set the Whipstock, it took weight in the 9 5/8” liner – not . . .

Lene Lomeland


PDF


Edit


DNO
6802 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 The pre-torque was not conducted in town. Unable to fit it in the buckling machine in the workshop. . . .

Lene Lomeland


PDF


Edit


DNO
6803 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Discovered dimensional issue between FA-1 tool and Dril-Quip couplings. Unable to enter with FA-1 . . .

Lene Lomeland


PDF


Edit


DNO
6804 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Lifting incident: when laying down the FA-1 tool came in contact with the Expro tong and damaged the . . .

Lene Lomeland


PDF


Edit


DNO
6808 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 XT-22 tong was used – required machinery to be used in servie mode. This due to the tong did not fit . . .

Lene Lomeland


PDF


Edit


DNO
6810 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Failure of Dril-quip lifting eyes while laying out the diverter from vertical to horizontal . . .

Lene Lomeland


PDF


Edit


DNO
6811 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Handling gear was backloaded. Crew did not realize “long stub” would need to be laid out.

Lene Lomeland


PDF


Edit


DNO
6813 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 07/10/2024 Space out incorrect compared to Stack-up drawing from Well partner. The upper spool of the WH stack . . .

Lene Lomeland


PDF


Edit


DNO
6758 – DNO

Nobel Invincible Drilling Operational 2/6-7 S
Falstaff
Top hole 23/09/2024 Movement of conductor. Adjusted scaffold at diverter platform. Installed chain hoist horizontally in . . .

Lene Lomeland


PDF


Edit


New Lesson Learned

You do not have permission to view this form.




\n\t\t

\n\t\t\t\n\t\t\t