WE Report

Lessons Learned

Lessons Learned865


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

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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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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Wellesley
5163 – Wellesley

Deepsea Yantai Drilling Planning 35/10-10S
Carmen
29/04/2023 There is to much information in the DOP’s. Easy to miss out on important steps because they are . . .

Drilling Engineer / Morten Laget


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Wellesley
5161 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 26/04/2023 Weighted up the mud by mixing in a heavier mud. The volume of heavier mud can partially compensate . . .

Drilling Engineer / Morten Laget


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Wellesley
5157 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
Production section 24/04/2023 It was done before the cementer got the change to da a pre-job check / install bypass baffle etc.

Drilling Engineer / Morten Laget


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Wellesley
5158 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Reservoir section 24/04/2023
NPT: 7.75 hrs
Cost: 1 614 000 NOK

Cyber chair stopped functioning.
On Odfjell.

Drilling Engineer / Morten Laget


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Wellesley
5159 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Production section 24/04/2023
Downtime due to reduced ROP after going to max ROP of 75 m/hr:
– Started with 30 m/hr
– Jumped up . . .

Drilling Engineer / Morten Laget


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Wellesley
5160 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Production section 24/04/2023
Lube mud had 1.34 sg when taken up.
Needed to weight it down to ± 1.25 sg.
New lube mud for 12 . . .

Drilling Engineer / Morten Laget


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Wellesley
5143 – Wellesley

Deepsea Yantai Drilling Operational 35/10-10S
Carmen
Surface section 16/04/2023
NPT: 1.25 hrs
Cost: 260 417 NOK
Downtime due to reaming and reduced ROP.
Drilled stand from . . .

Drilling Engineer / Morten Laget


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