Polysaccharide lost circulation materials for wellbore operations
US11427746B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Nov 9, 2018 |
| Grant date | Aug 30, 2022 |
| Priority date | — |
| Expiry date | Nov 9, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/44
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Described herein are plugging materials with polysaccharides that can be used in wellbore operations. A plugging material can include hydraulic cement, amorphous silica, polysaccharides, a retarder, clay, and an aqueous base, where the material is injectable into a wellbore. The polysaccharides can be cross-linked with borate. The retarder can be at least one of an organo phosphoric acid, a modified sulfonated styrene-maleic anhydride polymer, lignosulfonate, or a polyacrylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.