Injection profiles with radiation induced copolymers
US3973629A · kind A · utility
Inventors
Key dates
| Filing date | Nov 6, 1972 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Nov 6, 1992 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The injectivity profile of a heterogeneous formation and/or vertical conformance is improved by injecting an aqueous solution into the formation, the solution containing a polymer obtained as a product of radiation-induced polymerizatin of acrylamide and/or methacrylamide and acrylic acid, methacrylic acid, and/or alkali metal salts thereof. The polymerization is preferably carried out in a 10-60% aqueous solution with gamma radiation; the aqueous monomer solution preferably contains 25-99% acrylamide and 1-75% sodium acrylate. Immiscible, miscible, or miscible-like displacing processes can be used in conjunction with this invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.