Low temperature set retarded well cement compositions and methods
US5472051A · kind A · utility
145Cited by
10References
13Claims
0Family size
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Key dates
| Filing date | Nov 18, 1994 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Nov 18, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B28/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Improved set retarded cement compositions for cementing subterranean zones in wells at low temperatures having excellent short term compressive strength development and methods of using such compositions are provided. The compositions are basically comprised of a hydraulic cement, water and a copolymer containing 2-acrylamido-2-methylpropane sulfonic acid in an amount in the range of from about 65 to about 85 mole percent and acrylic acid in an amount in the range of from about 15 to about 35 mole percent having an average molecular weight below about 5000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.