System and method for leak prevention
A well cementing system may flow a carrier fluid into an annulus defined between an outer surface of a casing and a wellbore wall, the carrier fluid including reactive particles having a particle size between 1 nm and 1 μm. A well cementing system may coat at least a portion of an annular surface of the annulus with the reactive particles, the reactive particles formulated and configured to react with a reactant in the annulus to cause the reactive particles to increase in volume.
1 . 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.
2 . The method of claim 1 , further comprising flowing a cement slurry into the annulus after flowing the first carrier fluid and the second carrier fluid into the annulus and coating the portion of the annular surface with the first and second reactive particles.
3 . The method of claim 2 , wherein the cement slurry includes additional reactive particles mixed into the cement slurry.
4 . The method of claim 2 , wherein flowing the cement slurry into the annulus includes displacing the first carrier fluid and the second carrier fluid with the cement slurry.
5 . The method of claim 2 , further comprising, before flowing the cement slurry into the annulus, flushing the annulus with an inert gas.
6 . The method of claim 1 , wherein the first and second reactive particles are reactive to carbon dioxide (CO 2 ).
7 . The method of claim 6 , wherein the first and second reactive particles include olivine.
8 . The method of claim 1 , wherein flowing the first carrier fluid and the second carrier fluid includes flowing at least one of the first carrier fluid or the second carrier fluid into cracks in a cement liner.
9 . The method of claim 1 , further comprising pressurizing the first carrier fluid and the second carrier fluid after flowing the first carrier fluid and the second carrier fluid.
10 . The method of claim 1 , wherein at least one of the first carrier fluid or the second carrier fluid includes a polymer selected to be adhesive to the outer surface of the casing or the wellbore wall.
11 . The method of claim 1 , wherein at least one of the first reactive particles or the second reactive particles has a spherical shape.