US PATENT SUBCLASS 166 / 272.1
.~.~ Involving the step of heating

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}
272.1.~.~ Involving the step of heating {4}
272.2  DF  .~.~.~> In association with fracturing or crevice forming processes
272.3  DF  .~.~.~> Steam as drive fluid {2}
272.6  DF  .~.~.~> Liquid material injected
272.7  DF  .~.~.~> Horizontal well

DEFINITION

Classification: 166/272.1

Involving the step of heating:

(under subclass 268) A process in distinct, separate wells incorporating the step of raising the temperature of the fluid.

(1) Note. Any incidental heating due to a chemical reaction is not included unless it is specifically claimed.

(2) Note. The heating due to the natural heat of a formation is not included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247, for a process involving input and output wells and nuclear energy or radioactivity for heating the formation.

256+, for a process involving input and output wells and in situ combustion.

266, for a process involving input and output wells and separating fluid outside of the well by heating. 302+, for a heating process.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

12, for processes or apparatus for forming a bore by combustion of the earth formation material and subclass 17 for processes or apparatus including heating within the bore or heating the drilling fluid used in boring.

299, Mining or In Situ Disintegration of Hard Material,

4, for subject matter relating to input and output wells utilized for in situ conversion of solid material, other than hydrocarbons, to fluid for recovery and generally including the use of heat.