Materials for use in drilling fluids
US4631137A · kind A · utility
10Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1984 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Oct 30, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/003
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Bentonites can be extended for use in drilling muds by addition of a novel polymer blend comprising a low molecular weight water soluble non-ionic or anionic polymer and a high molecular weight anionic polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.