WE Report

Lessons Learned

Lessons Learned865


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

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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PGNiG
5838 – PGNiG

Deepsea Yantai External Environment Planning 6501/10-1
Tomcat
Environmental Seabed inspection 19/06/2023 During preparation of SoW, Marine department needed input from Engineering Company (InterMoor) to . . .

Stian Engvik / Morten Laget



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Wellesley
5835 – Wellesley

Deepsea Yantai Drilling
Own Experience
Planning 35/10-10S
Carmen
Surface section 16/06/2023 Crossovers supplied were of very different lengths: 4m, 6m and 12m.

Drilling Engineer / Morten Laget


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Wellesley
5836 – Wellesley

Deepsea Yantai Drilling
Own Experience
Planning 35/10-10S
Carmen
Top hole 16/06/2023 The casing string run was a mixed string of VAM TOP and VAM 21 with VAP TOP run first. This meant . . .

Drilling Engineer / Morten Laget


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Wellesley
5837 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Surface section 16/06/2023 Pups could not be run from aux using the “handshake” technique (too short for the Hydraracker) and . . .

Drilling Engineer / Morten Laget


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PGNiG
5834 – PGNiG

Deepsea Yantai Drilling
Own Experience
Planning 6305/10-1
Tomcat
N/A 15/06/2023
BO&K Analysis performed in Aug 2022, with a sensitivity on revised reservoir data.

The . . .

Richard Mollison / Morten Laget



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Wellesley
5833 – Wellesley

Deepsea Yantai Other Operational 35/10-10S
Carmen
N/A 13/06/2023 Unable to lift the BOP elevator with LMRP past fixed guide/bumper beams in moonpool. LMRP diameter . . .

Drilling Engineer / Morten Laget


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Wellesley
5186 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Reservoir section 20/05/2023
Drilled 8 1/2″ section with 5 7/8″ DP with 1400-1500 lpm and low ROP, saw ECD up to 18 points.
MW . . .

Drilling Engineer / Morten Laget


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Wellesley
5184 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Reservoir section 18/05/2023 Managed to fish roughly 1/2 of junk in hole that accumulated in junk basket (some was seen over . . .

Drilling Engineer / Morten Laget


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Wellesley
5185 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Reservoir section 18/05/2023 On second MDT got stuck with Saturn packer and had to release electrical cable head and fish . . .

Drilling Engineer / Morten Laget


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Wellesley
5183 – Wellesley

Deepsea Yantai 35/10-10S
Carmen
15/05/2023
The MDT was successfully fished with pipe after getting stuck but junk from the Saturn probe was . . .

Drilling Engineer / Morten Laget


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Wellesley
5173 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 Crew not participating in the pre-job meeting but involved in L/D core.

Drilling Engineer / Morten Laget


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Wellesley
5174 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 Treated the mud for the second and subsequent runs circulating BU after cutting cores.

Drilling Engineer / Morten Laget


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Wellesley
5175 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 Followed the HPHT manual for fingerprinting. Fingerprinter found some improvement point to the . . .

Drilling Engineer / Morten Laget


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Wellesley
5176 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 08/05/2023 When coring 54 m cores, during connection the kick stand was removed a single joint was connected . . .

Drilling Engineer / Morten Laget


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Wellesley
5172 – Wellesley

Deepsea Yantai Planning 35/10-10S
Carmen
Reservoir section 07/05/2023 Sent out a side door overshot from Archer last minute, but they did not have the grapples compatible . . .

Drilling Engineer / Morten Laget


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Wellesley
5171 – Wellesley

Deepsea Yantai Operational 35/10-10S
Carmen
N/A 06/05/2023 The BOP test tool was not ready to run. No DQ onboard and no status on the tool before they left the . . .

Drilling Engineer / Morten Laget


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Wellesley
5162 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
Reservoir section 29/04/2023 Found some deviation in the DOP’s from the HPHT manual.

Drilling Engineer / Morten Laget


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