extended forming conduits into an injection zone of the formation the method also includes the steps of extending the members so that they come into direct contact with a formation face of the injection zone of the productive interval running production tubing equipment into the borehole and injecting fluids into the tubing through the extendable assemblies and into the injection zone of the productive formation the method may further include the step of cementing the casing prior to injecting fluids into the well the present invention also broadly relates to a system for a completed injection zone including a borehole including an interval within a productive formation and a casing having at least one extendable assembly run into the borehole where the members are positioned within the interval and extended to form conduits between the casing and the interval by having a distal end of each of the members makes direct contact with a face of the formation at sites within the interval the system also includes production tubing and equipment and a fluid supply system where the fluid supply system is adapted to inject an injection fluid through the conduits in the interval suitable injections fluids including without limitation any fluid capable of being injected into a well although conventional drilling fluids can be used in most cases the pressures needed to inject these fluids well exceed the injection zone fracture pressure preferred fluids include without limitation fluids disclosed in u s.