Strongly adsorbed hyper-branched filtrate reducer for water-based drilling fluid with resistance to 240° C. and saturated salinity, preparation method therefor and use thereof
US12384953B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2024 |
| Grant date | Aug 12, 2025 |
| Priority date | — |
| Expiry date | Nov 19, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present disclosure relates to the technical field of well drilling, and discloses a strongly adsorbed hyper-branched filtrate reducer for water-based drilling fluid with resistance to 240° C. and saturated salinity, a preparation method therefor and use thereof. The filtrate reducer includes a first structural unit provided by an anionic hydration-enhancing monomer, a second structural unit provided by a cationic adsorption monomer, a third structural unit provided by a main chain monomer, a fourth structural unit provided by a cyclic monomer, a fifth structural unit provided by a polyether monomer, and a sixth structural unit provided by a hyper-branched structural monomer. The filtrate reducer of the present disclosure is capable of maintaining desirable rheology and filtrate reduction performance of the drilling fluid, and the long-term stability under the conditions of 240° C. and saturated salinity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.