Positive Bit LL with INEOS

Fat Canyon (6306/3-1 S) – Intermediate section

What happened:

ROP dropped from 50 m/hr to 1 m/hr

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What was planned:

Drill Shetland and Kvitnos formation with 1 2 1/4″ PDC bit

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What was learned:

So called plastic clay killed ROP. PDC bit with low measured depth of cut control ( MDOC), did not bite into the formation. We tried with bits up to 40/1000 inch MDOC, with poor results. The first bit was pulled and was partially balled up with soft-hard clay. This may have affected the ROP and performance.

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What actions are required:

Try to have back-up bits with higher MDOC and aggressive cutting structure for potential plastic clays in the future. Mix and be prepared to pump anti bit balling pill.

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What Was Done

On the second bit run we ran a PDC bit with 40/1000 inch MDOC, but this was not sufficient. ON the second bit run we tried to pump and soak the bit in a antil bit balling pill. This seemed to improve things.