Drilling fluid
US8424619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2011 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Jul 12, 2031 |
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 subject invention more specifically reveals a process for drilling a well into a subterranean formation which comprises boring a hole into the earth by rotary drilling, wherein a drilling fluid is circulated down a drilling pipe and returned to the surface of the earth through a pipe hole annulus, wherein the oil-based drilling fluid is comprised of (a) an organic liquid; (b) water; (c) an emulsifier; (d) a weighing material; (e) a fluid loss reducing agent; and (f) a chlorosulfonated α-olefin copolymer which is comprised of repeat units that are derived from ethylene and an α-olefin that contains from 4 to about 20 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.