Fracturing method for stimulation of wells utilizing carbon dioxide based fluids
US4519455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1984 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Jan 20, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/703
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 30 percent to in excess of about 95 percent by volume of carbon dioxide with the remainder comprising a substantially anhydrous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formation to a temperature above about 88.degree. F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.