WE Report

Lessons Learned

Lesson Learned





By: Drilling Engineer

Report No.

5860

Discipline/Origin

Drilling
Own Experience

Well

Norma
25/7-11 S

Date created

2023/07/30
860 days ago

Project Phase

Planning
Project Phase

LL Type/Classification

Casing
Negative

Deepsea Yantai


What happened in Top hole:
One of the stop collars fell of when it was picked up from the boat. When laying down the centralized joint to riser deck the centralizer hit a beam and the stop collar was destroyed. The centralizer was removed. When RIH the stop collar on another joint was observed loose with the ROV. Used the ROV to pull off the stop collar and the centralizer fell to the tool joint.

What Was Planned

To use hinged 20″ centralizers on the casing joints.

What Was Learned

Risk of damaging the stop collar on the centralizer RIH and PU. Can potentially result in dropped object.

What Actions Are Required

Evaluate to use slip on centralizers, not hinged.

EDITOR


CLOSE LL (testing)





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