New Environmentally Friendly Fluid to Remove Mn3O4 Filter Cake

The two-stage filter cake removal composition of claim 8, wherein the hydrochloric acid is present in an amount of between about 0.1% and 1.0% by weight.

A method for the controlled removal of a filter cake from a target production zone of a wellbore using a two-stage filter cake removal composition, the method comprising:

• delivering the two-stage filter cake removal composition to the target production zone, in an amount operable to control fluid loss,
• wherein the two-stage filter cake removal composition contacts the filter cake for a predetermined extended reaction time during which predetermined extended reaction time the two-stage filter cake removal composition acts to remove the filter cake and after which predetermined extended reaction time the two-stage filter cake removal composition acts to control fluid loss from the wellbore into the target production zone, and
• wherein the delivering comprises applying an enzyme of the two-stage filter cake removal composition to the filter cake in the target production zone in a first stage and applying a glycolic acid of the two-stage filter cake removal composition to the filter cake in the target production zone in a second stage.

A one-stage filter cake removal composition for use in a wellbore for controlled removal of a filter cake present in a target production zone, the one-stage filter cake removal composition comprising:

• a glycolic acid,
• a hydrochloric acid;
• wherein the one-stage filter cake removal composition, when the glycolic acid and the hydrochloric acid are applied to the filter cake in the target production zone in a single stage, is operable to remove the filter cake in the target production zone over a predetermined extended reaction time.