US PATENT SUBCLASS 73 / 152.05
.~.~ Density, porosity, or permeability

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}
152.02  DF  .~ Formation logging (e.g., borehole studies of pressure derivatives or of pressure-temperature derivatives) {8}
152.05.~.~ Density, porosity, or permeability {2}
152.06  DF  .~.~.~> Including oil, gas, or water saturation
152.07  DF  .~.~.~> By a core sample analysis

DEFINITION

Classification: 73/152.05

Density, porosity, or permeability:

(under subclass 152.02) Subject matter wherein the determination of the physical characteristic of the formation is made by measuring (a) a mass per unit volume of either a bulk formation of a borehole or of selected constituents of a formation of a borehole, (b) the ratio of a volume of interstices of either a bulk formation of a borehole or of selected constituents of a formation of a borehole to its volume, or (c) a quality of either a bulk formation of a borehole or of selected constituents of a formation of a borehole to be penetrated by a liquid or a gas passing through pores or openings therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

30.01, for measuring the density of a gas.

32+, for measuring the density of a solid or a liquid.

38, for measuring porosity or permeability by use of fluid pressure.

73+, for measuring the moisture content or absorption characteristic of a material.

152.41, for determination of permeability by the injection of fluid into a formation of a borehole. SEE OR SEARCH CLASS

378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for testing by measuring a property of X-rays or gamma rays and in particular for

54+, for determining density by measuring a property of X-rays or gamma rays.