US PATENT SUBCLASS 166 / 401
.~.~.~ Injecting a gas or gas mixture

Current as of: June, 1999
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166 /   HD   WELLS

244.1  DF  PROCESSES {39}
268  DF  .~ Distinct, separate injection and producing wells {7}
400  DF  .~.~ Sequentially injected separate fluids (e.g., slugs) {1}
401.~.~.~ Injecting a gas or gas mixture {1}
402  DF  .~.~.~.~> CO2 or carbonated gas {1}

DEFINITION

Classification: 166/401

Injecting a gas or gas mixture:

(under subclass 400) Sequentially injected fluid in which a drive or flooding substance is compressible, has low cohesive force, and has a viscosity that increases as temperature increases.

(1) Note. Included in this subclass would be air, nitrogen, hydrocarbon gas, flue gas, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

309, for a process producing foam or gas in a well by a material.