System and method for leak prevention

A method for annular crack mitigation in a wellbore, the method comprising:

• flowing a first carrier fluid and a second carrier fluid into an annulus defined between an outer surface of a casing and a wellbore wall, the first carrier fluid including first reactive particles and the second carrier fluid including second reactive particles, at least one of the first reactive particles or the second reactive particles having a particle size between 1 nm and 1 μm, wherein flowing the first carrier fluid and the second carrier fluid includes:
• flowing the first carrier fluid including the first reactive particles to a first section of the wellbore, the first section including a perforation section, and the first carrier fluid having a first concentration of the first reactive particles that is greater than a second concentration of the second reactive particles in the second carrier fluid;
• and
• flowing the second carrier fluid including the second reactive particles to a second section of the wellbore, the first reactive particles and the second reactive particles having at least one of a different shape or a different particle size range;
• and
• coating at least a portion of an annular surface of the annulus with the first and second reactive particles, the first and second reactive particles formulated and configured to react with a reactant in the annulus to cause the first and second reactive particles to increase in volume.