US PATENT SUBCLASS 73 / 152.39
.~.~ Fluid injection into formation

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

152.01  DF  BOREHOLE OR DRILLING (E.G., DRILL LOADING FACTOR, DRILLING RATE, RATE OF FLUID FLOW) {6}
152.18  DF  .~ Fluid flow measuring or fluid analysis {6}
152.39.~.~ Fluid injection into formation {1}
152.41  DF  .~.~.~> Determining permeability or saturation

DEFINITION

Classification: 73/152.39

Fluid injection into formation:

(under subclass 152.18) Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by forcing the fluid into the formation.

SEE OR SEARCH CLASS

166, Wells, appropriate subclass for fluid injection into a formation of a well and especially

252.1+, for well testing by the injection of fluids into the earth in order to produce other fluids.

405, Hydraulic and Earth Engineering,

263+, for injection of chemicals into the earth.