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Condensate banking is a phenomenon which happens in producing gas wells when bottom hole pressure goes below dew point pressure. Fall of bottom hole pressure below dew point pressure results into condensate dropping out of the fluid and getting accumulated around the wellbore, this significantly reduces the gas permeability and hence reduces gas production.
There are two major reasons for condensate banking as given below:
One major challenge faced by reservoir and production engineers is to determine if condensate banking is happening in the wellbore, we should always keep an eye on pointers towards condensate banking. If below indicators are observed, we should look towards suggested methods for reducing condensate banking. Some of the pointers of condensate banking are given below:
Above pointers does not provide confirmation of presence of condensate banking as there are numerous other things happening in well-bore and reservoir which can result into above indications. As for indications from well test, affects of condensate banking in well test might be masked due to well-bore storage or complexities arising due to velocity dependent relative permeability effects.
There are several methods which are suggested to reduce condensate banking, given as below:
Condensate banking is well known phenomenon which may affect gas producing wells in their lifetime. There are various methods suggested above to handle condensate banking. Each of the method is having its own pros and cons, it’s very important to choose methods which fits production strategy technically and in economic way. Carbon dioxide / Huff-n-Puff method are short term solution to condensate banking. Capillary pressure reduction and alteration in wettability only helps when condensate deposition is near well bore. Gas injection is a good method of handling condensate banking but it consumes large amount of gas and finally hydraulic fracturing is an expensive process.