Invert diesel emulsion mud for deep gas wells
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!