Systems, methods, and heaters for treating a subsurface formation are described herein. At least one method for providing acidic gas to a subsurface formation is described herein. The method may include providing heat from one or more heaters to a portion of a subsurface formation; producing fluids that...http://www.google.co.uk/patents/US7610962?utm_source=gb-gplus-sharePatent US7610962 - Sour gas injection for use with in situ heat treatment
