| abstract |
A well cementing slurry uses expanding agent encapsulated in a phenolic resin coating. Cement slurries and systems contain water, hydraulic cement, and the encapsulated expanding agent. Cement slurry preparation methods involve coating expanding agent particles with a phenolic resin. Pre-stressed cementing methods involve preparing the cement slurry, placing the slurry in an annulus in the well, hardening the cement, and delaying expansion of the set cement. |