Drilling fluids with crosslinked sulfonate-containing polymers dispersed in high density brines
US10000683B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2015 |
| Grant date | Jun 19, 2018 |
| Priority date | — |
| Expiry date | Jul 1, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Crosslinked sulfonate-containing polymers may be stable in high density, monovalent brines, which may render such polymers particularly useful in drilling fluids in general and, especially, in the subclass of drilling fluids known as drill-in fluids. For example, a drilling fluid may include a crosslinked sulfonate-containing polymer dispersed in a monovalent brine having a density of about 8 lb/gal to about 20 lb/gal, wherein the crosslinked sulfonate-containing polymer comprises: reactants of a first repeating unit and a crosslinker that react to form the crosslinked sulfonate-containing polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 50% to 99.99% by weight of the reactants, and wherein the crosslinker comprises at least two olefinic bonds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.