Calcium chloride is used as an accelerator and increases the cement strength in oil & gas well cementing systems. It is an economical option that significantly reduces thickening time and acts as an accelerator regardless of concentration, unlike many other accelerators. Bisley supplies both anhydrous calcium chloride and a 77% flake.
Calcium nitrate is used as an accelerator in oil & gas well cementing systems that also increases the strength of the concrete. Bisley supplies anhydrous and tetrahydrate forms of calcium nitrate.
Colloidal silica is used as an accelerator in oil & gas well cementing systems as it reduces thickening time of cement. Colloidal silica increases the compressive strength, eliminates the risk of gas migration at high temperatures and decreases fluid loss in cement. Colloidal silica decreases the permeability of set cement and only a small concentration is required, unlike inorganic salt accelerators the effects are improved in cement mixtures containing vermiculite. Bisley supplies COLLOIDAL-SIL™.
Calcium sulfate hemihydrate can be blended with Portland cement in oil & gas well cementing systems to reduce thickening and setting times.
Sodium silicate, although typically used as an extender, can also function as an accelerator in oil & gas well cementing systems. It also provides excellent loss circulation control when used in cement or calcium chloride brines.