Polyalkyl methacrylate copolymers for rheological modification and filtration control for ester and synthetic based drilling fluids
US6204224A · kind A · utility
37Cited by
17References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Oct 12, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/32
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A drilling fluid system for use in oil and gas well drilling operations is described having a rheological modifier/control agent comprising a polyalkyl methacrylate copolymer containing a small amount of vinyl pyrrolidone, a weighting agent, optionally an organophilic clay, with a base fluid making up the balance. The drilling fluid may be oil, invert emulsion, and in particular synthetic base fluid where the continuous phase may be synthetic esters olefins, paraffins, mineral oil or diesel oil, and the like. These copolymers prevent or reduce barite sag and provide cutting transport in these drilling systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.