Methods for downhole sequestration of carbon dioxide

Wells – Processes – Placing fluid into the formation

Reexamination Certificate

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C405S053000

Reexamination Certificate

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07726402

ABSTRACT:
Carbon dioxide is sequestered in a formation using a dual completion and injection method that reduces or eliminates upward leak rates of the sequestered carbon dioxide. The dual completion and injection method involves the injection of a benign fluid such as brine (water) into a permeable layer of the formation located above the sequestration layer and which is separated form the sequestration layer by a nearly impermeable layer. The water is preferably injected at the same time the carbon dioxide is injected.

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