WE Report

Lessons Learned

Lesson Learned





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Report No.

177

Discipline/Origin

Drilling
No origin

Well

Serin
35/12-7

Date created

2019/02/05
2496 days ago

Project Phase

Operational
Project Phase

LL Type/Classification

Planning
Negative

Transocean Arctic


What happened in Surface section:
The 50-80 RPM range given in HSG was insufficient. There was a need to rotate bit & BHA faster to create smooth torque and clean sticky clay off stbs. Noticed peaks in ECD behaviour which indicated balled up stabs.

What Was Planned

Drill section with narrow RPM range of 50-80 RPM.

What Was Learned

RPM needed to be increased in order to clean stabs.

What Actions Are Required

Decrease RPM limitation in HSG/DOP, discuss with BHA provider

EDITOR


CLOSE LL (testing)





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