Lignosulfonate and hydrolyzed carbohydrate retarder additive for cement mixture
US11535557B2 · kind B2 · utility
1Cited by
18References
20Claims
0Family size
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Key dates
| Filing date | Apr 15, 2021 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Apr 15, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A retarder mixture for oil and gas well cementing includes a lignosulfonate compound and at least one hydrolyzed carbohydrate. A method includes blending the retarder mixture and a cement precursor to form a cement precursor mixture and introducing water into the cement precursor mixture to form a cement mixture. The cement mixture is pumped down a well and cures to form a cement sheath containing the cement precursor and the retarder mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.