Patent ID: 9644137
Date: 2017-05-09
CPC Classifications: C09K,E21B

Claim:
1. A method of stimulating a reservoir for increased production of oil and gas; said method comprising: a) selecting a reservoir that is a carbonate-rich reservoir having a well comprising tubulars; b) injecting a preflush into said reservoir; c) injecting a first warm gas flush into said reservoir, wherein said first warm gas is at a temperature above a liquifying temperature of a cryogenic liquid; d) injecting said cryogenic liquid into said reservoir; e) injecting a second warm gas flush into said reservoir; f) injecting an at least 15% acid in water into said reservoir; g) injecting a postflush into said reservoir to displace the acid from the tubulars into said reservoir; h) shutting in well and allowing said cryogenic liquid to gasify and said acid to etch carbonate and enlarge existing fractures in said reservoir; and i) producing oil or gas from said etched reservoir.