Title:
QUATERNARY NITROGEN CONTAINING AMPHOTERIC WATER SOLUBLE POLYMERS AND THEIR USE IN DRILLING FLUIDS
Document Type and Number:
WIPO Patent Application WO2000060023
Kind Code:
A3
Abstract:
The present invention generally relates to water based drilling fluid compositions which contain at least one viscosity builder and at least one rheological control agent wherein said rheological control agent is an amphoteric polymer, the cationic groups of said amphoteric polymer being quaternary ammonium groups.
Inventors:
WARREN BRENT (CA)
VAN DER HORST PETER M (NL)
VAN T ZELFDE THEODORUS A (NL)
VAN DER HORST PETER M (NL)
VAN T ZELFDE THEODORUS A (NL)
Application Number:
PCT/EP2000/002884
Publication Date:
January 25, 2001
Filing Date:
March 31, 2000
Export Citation:
Assignee:
AKZO NOBEL NV (NL)
WARREN BRENT (CA)
HORST PETER M V D (NL)
T ZELFDE THEODORUS A VAN (NL)
WARREN BRENT (CA)
HORST PETER M V D (NL)
T ZELFDE THEODORUS A VAN (NL)
International Classes:
C09K8/20; C09K8/24; (IPC1-7): C09K7/02
Foreign References:
| US5663123A | 1997-09-02 | |||
| US5387675A | 1995-02-07 | |||
| EP0339372A2 | 1989-11-02 | |||
| EP0632057A1 | 1995-01-04 |
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