Well bore treating fluid for acidizing formations (in German)
Patent
·
OSTI ID:6345809
When acidizing calcareous formations containing iron compounds, the iron compounds are dissolved first, but they precipitate again when the pH of the acid increases as the acid is spent. According to this invention, this can be avoided by adding to the acid an inhibitor (general formula is given). This inhibitor can be used either in this form, or in the form of its water-soluble salts. The inhibitor is used in concentrations between 0.6 and 11 kg/cu mu. As a specific example, 1-hydroxy-ethylidenediphosphonic acid is mentioned. (5 claims)
- Assignee:
- TUL; EDB-81-078501
- Patent Number(s):
- DE 1235836
- OSTI ID:
- 6345809
- Country of Publication:
- United States
- Language:
- German
Similar Records
Well treating fluid and methods
Method of retarding reaction of acid on limestone
Pyridinium inhibitors for acidizing processes
Patent
·
Mon Jan 22 23:00:00 EST 1973
·
OSTI ID:5311827
Method of retarding reaction of acid on limestone
Patent
·
Tue Sep 26 00:00:00 EDT 1967
·
OSTI ID:6160420
Pyridinium inhibitors for acidizing processes
Patent
·
Tue May 24 00:00:00 EDT 1966
·
OSTI ID:6583279