Patent ID: 6209641
Filing Date: 2001-04-03
Classification: E21B

Abstract:
A method for producing an oil and gas stream from a first subterranean zone through a wellbore while simultaneously injecting gas into a second subterranean zone through said wellbore, said wellbore having a string of production tubing positioned therein to thereby form an annulus between said production tubing and said wellbore, said method comprising:producing said oil and gas stream Lo said surface through said string of production tubing;mixing said gas to be injected with a carrier fluid at the surface to form a carrier fluid-gas mixture;flowing said carrier-fluid-gas mixture down said annulus while producing said oil and gas stream;separating at least a portion of said gas from said carrier fluid-gas mixture after said carrier fluid-gas mixture has flowed down said annulus;injecting said separated portion of said gas into said second subterranean zone; andreturning the mixture of said carrier fluid and any unseparated gas to said surface.