Preparation of viscosifiers for zinc salt workover and completion brines
US4350601A · kind A · utility
24Cited by
14References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1981 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | May 18, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/925
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Viscosifiers for addition to high zinc salt brines, used as oil well workover and completion fluids, are prepared from polysaccharide gums or gelatin by treatment with formaldehyde and/or an aliphatic dialdehyde containing from 2 to 6 carbons. The treated viscosifiers have improved dispersibility and give increased viscosity effects in the brines. Preferably, the viscosifiers are prepared from carrageenan, locust bean gum, hydroxyethyl cellulose, or gelatin by treatment with a mixture of formaldehyde and glyoxal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.