Drilling fluids
US3956140A · kind A · utility
35Cited by
9References
56Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1973 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Apr 27, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/03
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Well drilling, workover and completion fluids containing various water soluble condensation products of phenolic materials, formaldehyde and sulfite salts. Such condensation products may be further modified by including during the condensation reaction one or more of urea, melamine, salicylic acid, benzoic acid, phthalic acid, adipic acid, succinic acid, glutaric acid, maleic acid or the anhydrides of said acids. The drilling, workover or completion fluids may also contain clay-dispersants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.