Methods and cement compositions for reducing corrosion of wellbore casings
US11939520B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2020 |
| Grant date | Mar 26, 2024 |
| Priority date | — |
| Expiry date | Oct 9, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/32
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A corrosion inhibiting cement composition for reducing corrosion of wellbore casings is disclosed that includes from 10 weight percent to 70 weight percent cement precursor, from 5 weight percent to 70 weight percent water, from 0.1% to 60% by weight of cement amine corrosion inhibitor, where the amine corrosion inhibitor comprises a polyethylene polyamine. A method for reducing corrosion of wellbore casings includes dispensing the corrosion inhibiting cement compositions into the annulus and allowing the corrosion inhibiting cement composition to cure to form a hardened cement, where the corrosion inhibiting cement composition includes a cement composition and the amine corrosion inhibitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.