System for installation of well stimulating apparatus downhole utilizing a service tool string

Abstract

A service tool string (,) is releasably attached to a bottom hole assembly (,) and forms a production string as well as a work string. The tool (,) has a mandrel (,) and a slide valve assembly (,) mounted on the mandrel for relative sliding movement. Crossover ports (,) are provided in the mandrel (,) and the slide valve assembly (,). Slide valve assembly (,) moves by gravity and spring action when not contacted by the bottom hole assembly (,) to a position in which ports (,) are blocked as shown in FIG.,B. Upon contact of slidable valve assembly (,) with the bottom hole assembly (,), slide valve assembly is moved upwardly for alignment of ports (,) as shown in FIGS.,B and,B. An equalizing valve (,) as shown in FIGS.,is effective to equalize the fluid pressure within the bottom hole assembly (,) with the fluid pressure outside the perforated casing section (,) so that in a reverse position as shown in FIG.,B, the service tool (,) can be lifted to a position above the upper packer assembly (,) and above the bottom hole assembly (,). A diverter ball (,) seated on a ball catcher (,) is effective to divert the fracturing fluid outwardly through crossover ports (,) as shown in FIG.,B for downward flow through the annulus (,) into the formation adjacent the perforated casing section (,).