US PATENT SUBCLASS 166 / 256
.~ In situ combustion

Current as of: June, 1999
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166 /   HD   WELLS

244.1  DF  PROCESSES {39}
256.~ In situ combustion {6}
257  DF  .~.~> Injecting while producing by in situ combustion from same well
258  DF  .~.~> Plural distinct superimposed formations
259  DF  .~.~> Including fracturing or attacking formation
260  DF  .~.~> Injecting specific fuel or catalyst for burning into formation
261  DF  .~.~> Injecting specific material other than oxygen into formation
262  DF  .~.~> Solid fuel or particles in well

DEFINITION

Classification: 166/256

(under subclass 244.1) A process in which burning takes place underground in the pores of the earth.

(1) Note. "Burning" under this definition is a vigorous union of a substance with oxygen, but does not include an explosion.

(2) Note. Burning taking place in a fracture in the earth is considered to take place in the pores of the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

251.1, for a process involving in situ combustion and a step of indicating, testing, measuring or locating.

270, for a process involving injection and producing wells and chemical interreaction of introduced material in the pores of the earth.

299, for a process involving an explosion. 300, for a process involving chemical interreaction of materials introduced into a well.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth, appropriate subclasses for boring by combustion of the formation material.