Improved equipment and methods for treating wells by processes such as acidizing, gravel packing, and the like, wherein provision is made for removing the excess acid, gravel, and the like, from the well while the work string or pipe, on which the equipment is run into the well, remains connected to...http://www.google.com.au/patents/US4519451?utm_source=gb-gplus-sharePatent US4519451 - Well treating equipment and methods
