Compositions and methods for enhanced fracture cleanup using redox treatment

A method for use of a cleanup fluid in a wellbore disposed in a reservoir, the method comprising the steps of:

• preparing an exothermic reaction component operable to generate heat, and the exothermic reaction component comprising at least one component selected from the group consisting of:
• urea;
• sodium hypochlorite;
• ammonium chloride;
• ammonium bromide;
• ammonium nitrate;
• ammonium sulfate;
• ammonium carbonate;
• ammonium hydroxide;
• sodium nitrite;
• potassium nitrite;
• and mixtures thereof,
• where the cleanup fluid comprises only liquid components in solution prepared to be fluidly compatible with a viscous fluid component,
• where the cleanup fluid does not include viscosifying components at concentrations that generate foam or introduce foam into the wellbore;
• injecting the exothermic reaction component into the wellbore;
• allowing the exothermic reaction component to react in situ to produce heat and nitrogen gas, the heat and nitrogen gas operable to increase temperature and pressure in situ, to create a reduced viscosity material;
• and
• squeezing the exothermic reaction component into the reservoir by injecting a foamed material comprising a foamed brine solution into the wellbore after the step of injecting the exothermic reaction component into the wellbore, the foamed brine solution prepared from a non-foamed brine to reduce a pressure gradient of the non-foamed brine.