Aqueous silica dispersion
AssigneeHalliburton Energy Services, Inc.
InventorsSairam K S Pindiprolu, Sudhir Maruti Nimane, Jan Pieter Vijn
Life of this patent
Estimating the term…
Abstract
Methods of forming an aqueous silica suspension are provided. The methods include admixing water, an organic acid, a silica powder, and a siliconate under certain conditions. The silica powder includes undensified silica powder in an amount of at least about 50% by weight and has a specific gravity in the range of from about 2.1 to about 2.5, a bulk density in the range of from about 12 lb/ft3 to about 40 lb/ft3, and a water requirement of from about 80 to about 250 at a pH in the range of from about 5.5 to about 7.5. Also provided are aqueous silica suspensions, hydraulic cement compositions, and methods of cementing in a well.
Claims16
A method of forming an aqueous silica suspension, comprising:
- (a) providing water;
- (b) providing an organic acid;
- (c) providing a silica powder, wherein said silica powder includes undensified silica powder in an amount of at least about 50% by weight, based on the total weight of the silica powder, and has a specific gravity in the range of from of about 2.1 to about 2.5, a bulk density in the range of from about 12 lb/ft3 to about 40 lb/ft3, and a water requirement in the range of about 80 to about 250 at a pH in the range of about 5.5 to about 7.5;
- (d) providing a siliconate;
- (e) admixing at least a portion of said organic acid with at least a portion of said water to form a mixture, said organic acid being admixed with said water in an amount sufficient to adjust the pH of said mixture to value in the range of about 1.5 to about 3.5;
- (f) after step (e), admixing at least a portion of said silica powder with said mixture;
- and
- (g) after step (f), admixing at least a portion of said siliconate with said mixture, said siliconate being admixed with said mixture in an amount sufficient to adjust the pH of said mixture to a value in the range of from about 6.0 to about 6.8.
Dependencies are inferred from the claim text.