Modified polyhistidine suitable for being used as a supramolecular shale inhibitor, method of preparing the same and its application in water-based drilling fluids
US10889742B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | May 29, 2020 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | May 29, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present disclosure relates to the technical field of water-based drilling fluid, in particular to a modified polyhistidine suitable for being used as a supramolecular shale inhibitor, a method of preparing the same, and its application in water-based drilling fluids. The modified polyhistidine has a histidine polymerization main chain comprising a structural unit, which is represented by Formula (1) and attached with a modifying group, and the histidine polymerization main chain has a histidine polymerization degree of 6-9. The modified polyhistidine provided by the present disclosure is a degradable biological material and has the advantage of environmental friendliness; when the modified polyhistidine is used as a shale inhibitor, it can take advantage of its supermolecular property to effectively inhibit the hydration expansion of montmorillonite which is the most important expansion mineral in shale, and exhibits excellent inhibition effect and desirable temperature resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.