Sequestration of greenhouse gasses by generating an unstable gas/saline front within a formation

摘要

A method is provided for sequestration of a greenhouse gas in a water-laden formation by injection of a fluid comprising greenhouse gas (GHG) into a formation under conditions suitable for generating an unstable front of said greenhouse gas within the formation. The injection may comprise a first stage wherein a gas phase comprising CO2 is injected into the formation, followed by a second stage comprising injecting an aqueous liquid into the formation, to thereby generate an unstable front within the formation that results in relatively rapid dissolution of the injected CO2 within the formation water. The cyclic nature of the injection, alternating between GHG and water injection, can be repeated for a number of times until the carrying capacity of the formation is deemed to have been reached.

主权项

1. A method for dissolving a greenhouse gas into formation water of a water-laden formation by generating an unstable front within the formation between formation water saturated with said greenhouse gas and formation water unsaturated with said greenhouse gas, said method comprising performing multiple cycles each comprising a first stage wherein said greenhouse gas is injected into said formation, followed sequentially by a second stage wherein an aqueous liquid is injected into said formation, wherein said stages are the same or different in duration and are each selected from several minutes, several hours, several days or several weeks, and wherein the mass ratio of said greenhouse gas to said aqueous liquid is between 1:20 and 1:100.