Drilling fluid containing chlorosulfonated alpha-olefin copolymers
US7998905B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2008 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Sep 7, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention is based upon the finding that certain chlorosulfonated α-olefin copolymers can be beneficially utilized in drilling fluids that are utilized in drilling subterreanean wells. For instance, it has been unexpectedly found that certain chlorosulfonated α-olefin copolymers can be beneficially used as total or partial replacements for organoclays in oil based drilling fluids. The chlorosulfonated a-olefin copolymers that are useful in the practice of this invention are typically chlorosulfonated ethylene/octene copolymers or chlorosulfonated ethylene/butene copolymers. The utilization of chlorosulfonated α-olefin copolymers in oil-based drilling fluids offers (1) long service life at high operating temperatures, (2) minimal formation damage, (3) improved filtration behavior, and (4) highly effective performance at low viscosifier levels. Additionally, the chlorosulfonated α-olefin copolymers utilized in the practice of this invention are soluble in conventional drilling fluid formulations which reduce the level of mixing required in preparation of the drilling fluid formulation. This makes the preparation of the drilling fluid easier, faster and less energy intensive. The…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.