High temperature stable fluid loss control system
US4411800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/903
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a high temperature stable composition capable of imparting a combination of pseudoplasticity and fluid loss control properties to aqueous systems. The composition is a combination of: PA1 (a) a solid, particulate silicate or alumino-silicate material; PA1 (b) a chemical compound capable of converting to a higher oxidation state under alkaline conditions; and PA1 (c) a reaction product of a polymeric substance selected from polyvinyl alcohol or hydroxyalkyl cellulose reacted with at least 1 percent of stoichiometry of a cross-linking agent selected from an epihalohydrin or an aldehyde containing or generating agent; wherein the amount of component (a) is at least 75 wt. percent of component (c) and component (b) is at least 25 wt. percent of component (c). The invention is further directed to improved drilling fluids containing said composition and to the process of drilling bore holes using said improved fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.