A cleanout procedure for use in a well with low bottom hole pressure that has become filled with sand. It employs a conductor string of pipe and a wash string of pipe inside the conductor string, both inserted in the well. A high pressure gas is applied to the inner annulus formed by the conductor and...http://www.google.es/patents/US4060130?utm_source=gb-gplus-sharePatente US4060130 - Cleanout procedure for well with low bottom hole pressure
Cleanout procedure for well with low bottom hole pressure
