Use of CSH suspensions in well cementing

摘要

Methods of a setting accelerator composition for inorganic binders which comprises at least one water-soluble comb polymer suitable as a superplasticizer for hydraulic binders and calcium silicate hydrate particles in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells which not only accelerates the setting and hardening of the cement slurries but also shortens the time in which the static gel strength of the hardening cement slurries increases from 100 lb/100 ft2 (4.88 kg/m2) to 500 lb/100 ft2 (24.4 kg/m2).

主权项

1. A method for accelerating the setting of a cement slurry comprising adding a sufficient amount of an accelerator composition to a cement slurry;
wherein the cement slurry comprises water and an inorganic binder; wherein the accelerator composition comprises a water-soluble comb polymer; and particles consisting of calcium silicate hydrate, wherein said particles are smaller than 5 μm; wherein the comb polymer has a main chain; wherein the comb polymer has side chains comprising polyether functions and acid functions; wherein the side chains are present on the main chain; and wherein the inorganic binder comprises Portland cement.