CONTROLLED ALTERNATING FLOW DIRECTION FOR ENHANCED CONFORMANCE

摘要

A method for reducing permeability in a first region (12) of a formation (10), comprises injecting a first composition in the first region (12) from a first location (30) near or and/or adjacent the first region (12); and injecting a second composition in the first region (12) from a second location (20) near or and/or adjacent the first region (12); wherein the first composition and the second composition are configured to react so as to form a reaction product (60) capable of reducing the permeability in at least a portion of the first region (12).