Method of acidizing sandstone formations
US7947629B2 · kind B2 · utility
22Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 6, 2007 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Jan 21, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An acidizing fluid for sandstone formations is provided, along with methods of acidizing a sandstone formation penetrated by a wellbore. The aqueous acid treatment is a mixture of an aqueous liquid, a fluoride source, and an effective amount of at least one homopolymer or copolymer of a polycarboxylic acid, salt thereof or derivative thereof, which is introduced into the wellbore, and allowed to acidize the formation and concurrently inhibit calcium fluoride formation and impart calcium tolerance to the fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.