9 5/8" Casing Flapper Valve

I am a TRS company rep and I have been requested by an operator to look into an integral casing flapper valve to potentially run on a string. This tool would work similar to a drill string check valve; allow drill fluid down, but not return. The 9 5/8 casing string will be set with packers at a depth of 2000 m. A contingency liner section may be drilled and liner set…so obviously we would need to run drilling tool and dp through and eventually set liner through it. 

If I can get any info on this…that would be greatly appreciated. I'm just not familiar with this system in Canada.

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