A well drilled with air or gas as a circulating medium traversing pay zones with greater than normal pressures or pressures such that hydrocarbons would permeate drilling fluids and cement is drilled and completed while permitting a continuous flow of hydrocarbons from the well until it is desired to...http://www.google.es/patents/US4605067?utm_source=gb-gplus-sharePatente US4605067 - Method and apparatus for completing well
