Additive for oil well cement, and cement composition and cement slurry both including said additive for oil well cement
US11174423B2 · kind B2 · utility
2Cited by
2References
5Claims
0Family size
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Key dates
| Filing date | May 11, 2017 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Jun 19, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided is a PVA-containing additive for oil well cement superior in fluid loss-reducing property. Specifically, provided is an additive for oil well cement, the additive containing polyvinyl alcohol having a saponification value of 75 to 85 mol % and a viscosity-average polymerization degree of 2,800 to 4,500. Also provided are a cement composition containing the additive for oil well cement in an amount of 0.01 to 30% bwoc and a cement slurry containing the additive for oil well cement in an amount of 0.01 to 30% bwoc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.