WE Report

Lessons Learned

Lesson Learned





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Report No.

274

Discipline/Origin

Drilling
No origin

Well

Rungne
30/6-30

Date created

2019/09/30
2259 days ago

Project Phase

Operational
Project Phase

LL Type/Classification

Operational
Negative

Transocean Arctic


What happened in Intermediate section:
Tagged fill 30 m above casing hanger landing depth/ casing shoe 36 m off bottom. Washed heavy casing string down with 1000 lpm, until casing hanger was 10 m above wellhead (inside riser, above BOP rams). Annulus packed off several times, observed max hookload of 290 mt (limit 310 mt). Circulated well clean with 1500 lpm, 2.5 x BU volume. Observed large amount of drilled cutttings on shakers, filled 3.5 cuttings skips (eq. 70-80 m 12 1/4″ hole). Geologist confirmed 5 % mechanical cavings and 95% cuttings from PDC bit. 25% trip gas on BU. Continued to wash down last 10 m and landed hanger.

What Was Planned

Running 9 5/8″ casing

What Was Learned

NA

What Actions Are Required

NA

EDITOR


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