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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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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Wellesley
5839 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Intermediate section 20/06/2023 The cement didn’t set up as expected.

Drilling Engineer / Morten Laget


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Wellesley
5840 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 It was run according to tally.

Drilling Engineer / Morten Laget


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Wellesley
5841 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 The CHSART was run with the pup sent out with the tool.

Drilling Engineer / Morten Laget


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Wellesley
5842 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 Had some stringer in the bottom of the 12 1/4″ Section and had to work the csg hgr w/seal assy up . . .

Drilling Engineer / Morten Laget


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Wellesley
5843 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Intermediate section 20/06/2023 It was separated into two runs. The cup tester did not fit in the 9 7/8″ wearbushing installed in . . .

Drilling Engineer / Morten Laget


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Wellesley
5145 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Intermediate section 16/04/2023 FIT was a success. Shaved off 1.75 hrs compared to the test at 20″ shoe. 2.5 hrs vs 0.75 hrs. . . .

Drilling Engineer / Morten Laget


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Wellesley
5141 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Intermediate section 13/04/2023 Not approved pressure test. Downtime to drilling contractor.

Drilling Engineer / Morten Laget



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Wellesley
5114 – Wellesley

Deepsea Yantai Drilling Operational Eirik (OMV) Intermediate section 30/03/2023 Experienced higher pore pressure earlier than expected. Had enough to weight up active from 1,44 to . . .

Sander Schaathun / Morten Laget


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PGNiG
4841 – PGNiG

Deepsea Yantai Drilling
Own Experience
Operational 6608/1-1 S Intermediate section 04/09/2022 Had to switch to a BX elevator

Drilling Engineer / Morten Laget


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PGNiG
4762 – PGNiG

Deepsea Yantai Drilling
Own Experience
Planning Copernicus Intermediate section 22/08/2022 4-string contingency scenario was miscommunicated and we did not have the 13 3/8″ SSRII landing . . .

Richard Mollison / Morten Laget



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INEOS
2300 – INEOS

Borgland Dolphin Drilling
Own Experience
Planning 6306/3-1 S
Fat Canyon
Intermediate section 09/11/2021
Initial planned centralizer program of using 1 centralizer every other joint above shoetrack to top . . .

Drilling Supervisor / Morten Laget


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INEOS
2276 – INEOS

Borgland Dolphin Drilling
Own Experience
Operational 6306/3-1 S
Fat Canyon
Intermediate section 07/11/2021 Decided to use the Franks casing circulating tool FA-1

Drilling Supervisor / Morten Laget


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INEOS
2277 – INEOS

Borgland Dolphin Drilling
Own Experience
Operational 6306/3-1 S
Fat Canyon
Intermediate section 07/11/2021 It took 4,25 hrs to rig it up on Borgland Dolphin. The rigging up of casing tong and FMS slips . . .

Drilling Supervisor / Morten Laget


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INEOS
2278 – INEOS

Borgland Dolphin Drilling
Own Experience
Operational 6306/3-1 S
Fat Canyon
Intermediate section 07/11/2021 We had several faults on the Franks equipment. This led to troubleshooting, phone calls to town, . . .

Drilling Supervisor / Morten Laget


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