US PATENT SUBCLASS 73 / 152.38
.~.~.~ Drawdown or shutin test

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}
152.37  DF  .~.~ Steady state fluid flow interruption {1}
152.38.~.~.~ Drawdown or shutin test

DEFINITION

Classification: 73/152.38

Drawdown or shutin test:

(under subclass 152.37) Subject matter wherein a determination of the characteristic of the borehole, the casing, or the drill rigging is made by decreasing a liquid level or completely stopping the flow of the fluid as by the closing of a valve.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

40+, for flow restrictors, per se.

166, Wells,

92.1, for well caps or heads, subclasses 95.1 and 97.1 for valves in the well head, and subclasses 316+ and the notes thereunder for valves or restrictors, per se, for a well or well apparatus.

251, Valves and Valve Actuation, appropriate subclass for a valve, per se.