Positive Cement LL with DNO

Norma (25/7-11 S) – P&A

What happened:

Due to high percentage of gas in the mud return the interface had to go over the shaker system and degasser to decrease the gas in the mud.

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What was planned:

During the P&A/KO cement job the plan was to by-pass the shakers when the interface came in return

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What was learned:

The interface volume increased when sending over shakers/more contaminated mud.