CRYOGENIC ACID FRACK

摘要

A method of fracking carbonate-rich reservoirs, comprising injecting a cryogenic or chilled fluid followed by an acid into said reservoir, allowing the acid to etch said reservoir, and thereby increasing production of a fluid, such as water, oil or gas, from said reservoir.

主权项

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; b) injecting a preflush into said reservoir; c) injecting a warm gas flush into said reservoir; d) injecting a cryogenic fluid into said reservoir; e) injecting a warm gas flush into said reservoir; f) injecting an acid into said reservoir; g) injecting a postflush into said reservoir to displace the acid from the tubulars; h) allowing said mixture to etch and enlarge existing fractures in said reservoir; and i) producing oil or gas from said etched reservoir.