| US 7,473,313 B2 | ||
| Gas-generating additives having improved shelf lives for use in cement compositions | ||
| Ashok K. Santra, Dunan, Okla. (US); and Rita J. McKinley, Dunan, Okla. (US) | ||
| Assigned to Halliburton Energy Services, Inc., Duncan, Okla. (US) | ||
| Filed on Jun. 15, 2005, as Appl. No. 11/153,087. | ||
| Prior Publication US 2006/0283357 A1, Dec. 21, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C04B 24/00 (2006.01) | ||
| U.S. Cl. 106—696 [106/724; 106/823; 428/403; 428/407] | 20 Claims |
| 1. A cement composition comprising: a gas-generating material at least partially coated with a mixture comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and a C8-C18 hydrocarbon for increasing a shelf life of the gas-generating material, wherein the C8-C18 hydrocarbon is present in the mixture in a range of about 0.25% to about 5% by weight of the gas-generating material. |