Low permeability subterranean formation testing methods and appa

Details Low permeability subterranean formation testing methods and appa Low permeability subterranean formation testing methods and appa

1992-06-24

1993-11-23

Williams, Hezron E.

Measuring and testing

With fluid pressure

Porosity or permeability

73153, 166250, G01N 1508, E21B 4902

Patent

active

052633608

ABSTRACT:
The present invention provides methods and apparatus for determining the gas permeability of very low permeability subterranean formations as well as the gas permeability reducing effects of injecting one or more treatment fluids thereinto. A gas is injected into a core sample of the formation at a selected substantially constant pressure, and the injection is continued for a long period of time to insure steady state flow conditions. The temperature of the gas as it flows through the core sample and the flow rate of the gas exiting the core sample are measured, and the native state gas permeability of the core sample is calculated therefrom. One or more treatment fluids can be injected into the core sample after the native state permeability is determined. Thereafter, the gas permeability can again be determined and compared to the native state permeability.

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