Method for enhancing stability of oil based drilling fluids at high temperatures
US8062997B2 · kind B2 · utility
3Cited by
1References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2009 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | May 27, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Methods for enhancing the stability of ester based drilling fluids for drilling, running casing in, and/or cementing a borehole in a subterranean formation are disclosed, as well as improved ester based drilling fluids for use at high temperatures. The advantages of the invention are realized by inhibiting hydrolysis of the esters in the drilling fluid by adding a monomeric or polymeric carbodiimide hydrolysis inhibitor to the drilling fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.