Patent ID: 8857516

Claim:
A method for fracturing multiple zones in a wellbore, comprising: opening a first port in a first valve assembly using a shifting tool, wherein opening the first port comprises: engaging a sliding sleeve coupled to the first valve assembly with the shifting tool; and moving the shifting tool upward, thereby moving the sliding sleeve to an open position that is axially-offset from the first port; flowing a fluid through the first port to fracture a first zone; closing the first port using the shifting tool after the first zone has been fractured, wherein closing the first port comprises: engaging the sliding sleeve with the shifting tool; and moving the shifting tool downward, thereby moving the sliding sleeve to a closed position that is axially-adjacent to the first port; opening a second port in a second valve assembly using the shifting tool after the first port has been closed, wherein the second valve assembly is positioned below the first valve assembly; flowing the fluid through the second port to fracture a second zone; and closing the second port using the shifting tool after the second zone has been fractured.