Invert diesel emulsion mud for deep gas wells

Hello colleagues!

We're currently using invert diesel emulsion mud (70/30) for deep gas wells and see significant increase in gas production rates vs previously used biopolymer clayless mud.

Despite sufficient increase in production we're concerned with a probability of formation damage due to addition of third phase to the system (gas-water) and reducing gas flow?

What would be your experience, and what type of mud would you recommend for gas condensate fields (average water rate 2-4m3/day) with carbonate and sandstone reservoirs (lower carboniferous - visean).

Any help would be greatly appreciated!

Alex.

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