High solids pumpable cement additives
AssigneeW. R. Grace & Co.-Conn.
InventorsLeslie A. Jardine, David F. Myers, Anandakumar Ranganathan
Life of this patent
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Abstract
Exemplary liquid cement additive compositions have high solids loading which includes alkali or alkaline earth metal salts and other cement additive components. The liquid carrier is preferably aqueous in nature, although non-aqueous carriers are possible, and the carrier is modified using a viscosity modifying agent and dispersant to help load salt and other solids in high level amounts. Thus, methods for making the liquid cement additive compositions are also disclosed.
Claims31
A liquid cement additive composition, comprising:
- a liquid carrier for suspending solid particles therein;
- a first cement additive comprising solid particles dispersed substantially throughout said liquid carrier, said solid particles comprising at least one alkali or alkaline earth metal salt selected from the group consisting of chlorides, nitrates, nitrites, thiocyanates, borates, polyphosphonates, and gluconates;
- a second cement additive different from said first cement additive, said second cement additive contained within or as said liquid carrier, said second cement additive comprising an amine, an alkanolamine, a poly(hydroxyalkylated) polyethyleneamine, a glycol, a carbohydrate, a surfactant, or mixture thereof;
- said liquid cement additive composition having a total salt content in an amount that is not less than 50% based on total weight of said liquid cement additive composition and in an amount that is not greater than 90% based on the total weight of said liquid cement additive composition;
- and
- said liquid cement additive composition having a total solids content no less than 70% and no greater than 100% based on total dry weight solids.
Method for making a liquid cement additive composition, comprising:
- providing a viscosity modifying agent and a liquid carrier for suspending said viscosity modifying agent, said liquid carrier comprising an amine, an alkanolamine, a poly(hydroxyalkylated) polyethyleneamine, a glycol, a carbohydrate, a surfactant, or mixture thereof;
- and introducing into said liquid carrier medium a plurality of solid particles comprising at least one alkali or alkaline earth metal salt selected from the group consisting of chlorides, nitrates, nitrites, thiocyanates, borates, polyphosphonates, and gluconates.
A method for making a cement additive composition, comprising:
- obtaining a first liquid aqueous suspension by combining a viscosity modifying agent, a dispersing agent operative to disperse the viscosity modifying agent in water, and water;
- and
- obtaining a second liquid suspension by combining said obtained first liquid aqueous suspension with at least one alkali or alkaline earth metal salt, whereby water is present in said second liquid aqueous suspension in an amount not less than 4% by total weight of said composition and not greater than 30% by total weight of said composition.
A method for making a high solids salt cement additive composition, comprising:
- mixing a viscosity modifying agent and water using a high shear mixer to form a first suspension;
- and subsequently combining said first suspension with at least one alkali or alkaline earth metal salt.
Dependencies are inferred from the claim text.