Of the many methods provided herein, the present invention provides a
method comprising: providing a drill-in fluid that comprises an aqueous
base fluid, a viscosifier, a relative permeability modifier fluid loss
control additive, and a degradable bridging agent comprising a degradable
material capable of undergoing an irreversible degradation downhole;
placing the drill-in fluid in a subterranean formation; and allowing the
relative permeability modifier fluid loss control additive to reduce
fluid loss from the drill-in fluid to the subterranean formation. Another
example is a method of degrading a filter cake in a subterranean
formation comprising: providing a filter cake produced by a drill-in
fluid that comprises an aqueous base fluid, a viscosifier, a relative
permeability modifier fluid loss control additive, and a degradable
bridging agent comprising a degradable material capable of undergoing an
irreversible degradation downhole; and allowing the degradable bridging
agent to degrade.