Phosphonate-containing polymer and use thereof and phosphonate-containing polymer viscosity reducer for drilling fluid
US9206342B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Sep 19, 2013 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Feb 27, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F212/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a phosphonate-containing polymer and use thereof and a phosphonate-containing polymer viscosity reducer for drilling fluid. The phosphonate-containing polymer comprises structural units expressed by formula (1), structural units expressed by formula (2), and structural units expressed by formula (3) and/or structural units expressed by formula (4), wherein, the ratio of the mole number of the structural units expressed by formula (1), mole number of the structural units expressed by formula (2), and total mole number of the structural units expressed by formula (3) and structural units expressed by formula (4) is 10-85:10-75:5-55. The phosphonate-containing polymer still has outstanding viscosity reducing effect after high-temperature aging when it is applied in brine drilling fluids and high-density drilling fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.