Precipitation prevention in produced water containing hydrate inhibitors injected downhole
US8980798B2 · kind B2 · utility
3Cited by
14References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Jun 20, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The precipitation of polymeric kinetic hydrate inhibitors (KHIs) in stored produced water is prevented or inhibited by incorporating a water immiscible solvent therein having a polarity index greater than about 3. The polymeric KHIs whose precipitation is inhibited or prevented include, but are not limited to, hyperbranched molecules, polyvinylcaprolactam, polyvinylpyrrolidone, and the like. Suitable water immiscible solvents include, but are not necessarily limited to, xylene, toluene, kerosene, mineral spirits, trimethylbenzene, cumene, heavy aromatic naphtha, ethylbenzene, polyethylbenzene, naphthalene, and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.