Extrusion of bentonite clay for fluid loss reduction in drilling fluids
US4462470A · kind A · utility
30Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1983 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Jan 24, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/904
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The fluid loss and viscosity loss characteristics of a water expandable bentonite clay are substantially improved by extruding the clay through die openings while, at the same time, passing a wiper or scraping blade across the entrance of the die openings. In this manner, very inexpensive and low grade clays can be substantially improved and thus modified making such clays acceptable in fluid loss and viscosity for use in a drilling fluid or mud.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.