Sulfonated gilsonite drilling mud additive
US4385999A · kind A · utility
10Cited by
5References
9Claims
0Family size
Inventor
Key dates
| Filing date | Aug 10, 1981 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Aug 10, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/145
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A sulfonated gilsonite used in a drilling mud for drilling a well wherein the sulfonated gilsonite is prepared by reacting at a temperature between 210.degree.-280.degree. F. with a mixture of water, gilsonite having a softening point of at least 300.degree. F., lignite, sulfonating compound and water soluble based compound for a period of time to sulfonate the gilsonite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.