Carbon dioxide flooding with a premixed transition zone of carbon dioxide and crude oil components
US4589486A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1984 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | May 1, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/164
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosed invention is a method of recovering hydrocarbons by determining the critical concentrations of various crude oil components to carbon dioxide to achieve first contact miscibility of a mixture of said crude oil components and carbon dioxide with the underground hydrocarbons at formation temperature and a selected pressure substantially lower than first contact miscibility pressure of carbon dioxide with the hydrocarbons; injecting into the formation a premixed transition zone slug comprising carbon dioxide and said crude oil components at said critical concentrations, formation temperature and said selected pressure; and injecting a drive fluid into the formation after the premixed transition zone slug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.