Method for scale inhibition in oil producing wells
US5090479A · kind A · utility
4Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1990 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/528
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for inhibiting scale formation in oil producing wells. The method comprises pretreating the rock formation of the near well bore area with a surface agent and then a saline solution by injecting these down the well bore. Subsequently the formation is treated with a source of divalent cations such as calcium. An acid inhibitor in the form of a polyacrylic acid derivative, a phosphonated or a phosphinopolycarboxylic acid is then injected into the rock formation and allowed to soak in for a period of 24 hours. The inhibitor is retained on the surface area of the rock formation by means of divalent cationic bonds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.