Patent ID: 7763099
Filing Date: 2010-07-27
Classification: B01D,C10L,E21B,Y02C,Y02P

Abstract:
1. A system for the downhole separation of carbon dioxide from natural gas produced from natural gas reservoirs in a formation traversed by a completed well and having a sequestration layer, comprising: a dual reflux pressure swing adsorption (PSA) system with two packed PSA beds contained in PSA tubes located in the well generally maintained at different pressures relative to each other during operation and having top, bottom and middle portions, each middle portion receiving at different times from the formation a mixture of the carbon dioxide and natural gas, wherein said PSA beds generate purified carbon dioxide and purified natural gas from the mixture, the top portions of said PSA beds adapted to receive one at a time some of at least one of said purified natural gas and said purified carbon dioxide, and the bottom portions of said PSA beds adapted to receive one at a time at least some of the other of purified natural gas and purified carbon dioxide; and at least one additional tube adjacent at least one of said PSA tubes for carrying said purified carbon dioxide to the sequestration layer.