Tight gas stimulation by in-situ nitrogen generation

A method for stimulating production of gas in a tight-gas formation, the method comprising the steps of:

• injecting into the tight-gas formation an aqueous solution comprising an ammonium containing compound and a nitrite containing compound, wherein at least one of the ammonium containing compound and the nitrite containing compound are encapsulated with a coating operable to delay reaction therebetween, wherein the aqueous solution is injected at a sufficient rate and pressure to cause fractures in the tight-gas formation, wherein the fractures extend into the tight-gas formation, wherein the fractures have a fracture surface;
• and
• injecting an activator into the tight-gas formation, the activator being capable of initiating reaction between the ammonium containing compound and the nitrite containing compound such that the reaction generates heat and nitrogen gas;
• and
• allowing the generation of nitrogen gas and heat within the tight-gas formation to effect stimulation of the fracture surface, wherein the stimulation of the fracture surface produces microfractures at the fracture, wherein the hydrostatic pressure within the reservoir is reduced to less than the reservoir fluid pressure, such that the rate of production of hydrocarbons from the tight-gas formation is increased.