High-efficiency milk-like friction reducer with instant dissolution for shale gas slick water fracturing
US10040988B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2015 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Feb 28, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/28
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a milk-like friction reducer used in slick water fracturing and belongs to the technical field of oilfield chemicals. This friction reducer is obtained via free radical polymerization in water by using component A, component B and component C; wherein said component A is a mix of nonionic water-soluble monomers having carbon-carbon double bond; wherein said component B is a mix of water-soluble polymeric stabilizers obtained from monovalent cationic monomers; and wherein said component C is a mix of monovalent inorganic salts. The present invention is environmentally-friendly and easy to use. Its subsequent friction reducer is convenient to add on-the-fly and leads to no foaming without adding anti-foamer. Moreover, unlike other regular friction reducers, it is tolerant with various brines and compatible with common oilfield additives. The subject friction reducer can achieve an extent of friction reduction of greater than 70%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.