FRACTURING METHOD PROVIDING SIMULTANEOUS FLOW BACK

摘要

A bottom-up method of fracturing a multi-zone (3,5) subterranean formation intersected by a wellbore enables one zone to be fractured while simultaneously flowing previously placed fracture fluid from one or more other zones back to the surface. The method employs a bottom-hole assembly that is attached to the bottom end of a tubing string (12). Including a hydra jetting sub (18), a centralizer (14), a packer (26) and valve sub (28). The hydra jetting sub is used to perforate and initiate the fracture in the zones of interest. The zones are fractured by pumping fracturing fluid down the annulus formed between the tubing string and the wellbore. The previously placed fracture fluid flows back to the surface through the tubing string. It enters through the valve sub in the BHA.