WE Report

Lessons Learned

Lesson Learned





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Report No.

181

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
N/A

Transocean Arctic


What happened in Surface section:
The 13 3/8″ casing was run to 2 m above the land off depth for 18 3/4″ WH. Circulated 1.5 x BU with 1.40 sg WBM at 4000 lpm, cleaning out cuttings and clay from annulus. This was done as a compensating measure since wiper trip was not done., and to avoid plugging of flow ports between 18 3/4″ WH and 30″ WHH. The 18 3/4″ WH was thereafter landed and locked into the 30″ WHH.

What Was Planned

Land and lock 18 3/4″ WH into 30″ WHH.

What Was Learned

Procedure worked according to plan.

What Actions Are Required

Use same procedure for similar operations in the future.

EDITOR


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