Applications of waste gas injection into natural gas reservoirs

摘要

Natural gas is produced from a reservoir above a bitumen reserve with minimal or no impact on concurrent or subsequent production of bitumen recovery techniques including SAGD. Greenhouse benefits over and above the benefits of coincidental recovery are available through the injection of waste gas containing carbon dioxide for maintaining pressure in the gas reservoir while producing natural gas. Carbon dioxide separates out of the waste gas through preferential absorption in connate or aquifer water, with the result that carbon dioxide is thereby both retarded from flowing to the natural gas production well and effectively sequestered in the reservoir water. Additional advantage is achieved wherein water influx at production wells can be managed and trapped gas can be recovered.