CARBON DIOXIDE ENERGY STORAGE AND ENHANCED OIL RECOVERY

摘要

The present invention is a method and apparatus for the subsurface storage of carbon dioxide in reservoir formations, to provide energy storage for electrical load balancing, and to enable the enhanced recovery of hydrocarbon fluids from the subsurface formations by gravity drainage. Multiple propped vertical inclusions are propagated into hydrocarbon fluid bearing reservoir formations at various vertical depths from well casings. Carbon dioxide is injected and stored in the formations. At off-peak power demand periods, carbon dioxide is pumped by a pump/turbine from the low energy formation into a deeper high energy formation, and at peak power demand periods the carbon dioxide is released from the high energy formation and flows to the low energy formation, driving the pump/turbine to generate electricity. Hydrocarbon fluids are produced from the formations depending on the formation conditions. Additional carbon dioxide is injected into the system as hydrocarbon fluids are extracted.