Cleaning wellbore perforation clusters and reservoir fractures

Abstract

Methods for cleaning wellbore perforation clusters and reservoir fractures include extending a conduit into a wellbore until the conduit reaches a measured depth deeper than a designated perforation cluster, moving the conduit back and forth between the measured depth and a shallower measured depth, and dispensing different fluids into the wellbore via the conduit during respectively different cycles of the back and forth motion. The fluids may be liquid and/or gas. The conduit is dimensionally configured and arranged within the wellbore such that a passageway exists in the wellbore exterior to the conduit. The methods include closing the passageway prior to, at the same time or subsequent to introducing a gas-containing fluid into the wellbore and continuing to dispense the gas-containing fluid into the wellbore after closing the passageway. Storage mediums having program instructions which are executable by a processor for performing any steps of the methods are also provided.