WE Report

Lessons Learned

Lesson Learned





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Report No.

183

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

Operational
Negative

Transocean Arctic


What happened in Production section:
Drilled stab-in float collar in only 50 minutes, but used 3.5 hrs to drill shoe, which is more than twice the time it took to drill 13 3/8″ shoe on KallÃ¥sen. Same float shoe, drilling parameters and bit. Hard to explain the difference.

What Was Planned

Drill stab-in float collar and shoe.

What Was Learned

Had to use up to 10 MT WOB to drill through, although the limits given in the HSG was only 5 MT WOB.

What Actions Are Required

Need to increase max allowable WOB to 10 MT. Discuss with BHA provider

EDITOR


CLOSE LL (testing)





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