Acid composition and method for acid treating geological formations
US4101426A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1976 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Nov 15, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/934
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An acid composition comprising a substantially anhydrous liquid mixture of (1) about 50 to 99 weight percent of polyphosphoric acid having about 5 to 90 weight percent of the total P.sub.2 O.sub.5 present as polymeric P.sub.2 O.sub.5, and (2) about 1 to 25 weight percent of hydrofluoric acid, and in which the H.sub.2 O/P.sub.2 O.sub.5 mole ratio of the overall acid mixture is less than 3.4; and a method for increasing the permeability of siliceous subterranean formations in which the formation is treated with this composition. Also, the composition can optionally contain a catalyst such as a strong mineral acid, a carboxylic acid, an oxidizing agent, or mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.