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measuring the coefficients of the absolute permeability of rocks
for gas and the absolute porosity of rock samples. The ranges of the
measuring are following: the range for the coefficient of the absolute
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
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permeability of rocks for gas is (0.005 – 3.0)×10 m ; the range for
the coefficient of porosity of rocks is 0.1 – 40.0 %. The error is 7.0 %
and 6.0 % for the coefficient of the absolute permeability of rock
samples for gas and for the absolute porosity of rocks accordingly.

The automatic permeameter-porosimeter AP–608. The
automatic permeameter-porosimeter AP–608 is applied for measuring
the coefficients of the absolute permeability and the absolute
porosity factors of rocks under the overburden pressure up to

67.6 10 6 Pa. The permeameter-porosimeter AP–608 is intended for one
sample of rock which is inserted by hand. The coefficient of the
absolute permeability of rock is measured by the method of pressure

release (according to Klinkenberg). The pore volume is determined by
a method which is based on the Boyle’s law. The device can be used
in the laboratories both with small and large requirements to the

volumes of core analysis.
Technical characteristics of the automatic permeameter-
porosimeter AP–608 are following:

the range of measuring the coefficient of absolute permeability
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of rocks is from 0.001 10  15 to 3 10  12 m ;
the range of measuring the coefficient of absolute porosity of

rocks is from 0.01 to 40 %;
the sizes of the rock sample (the core) are: the length is from
19 to 102 mm, the diameter is 25 or 38 mm;
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the overburden pressure is from 2 10 up to 67.6 10 Pa.

3.3 Equipment, devices and materials

The following equipment, devices and materials should be used
for the experiment: compressor, the GC-5 (ГК-5) device, barometer
and stopwatch. The GC-5 (ГК-5) device consists of the chlorine-

calcium pipe; thermometer; filter; core holder with the core (rock
sample); microreducer (control valve); manometer and gas meter. To
measure the atmospheric pressure barometer is used. The chart of
GC-5 (ГК-5) device is given in figure 3.1. Air comes to core holder 5

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