Page 19 - 5010

m 3
 Pa  s  m
Q    L s
k  l   [ m 2 ].
рer.l. 2
A  P m  Pa

In SI system permeability coefficient of rock is measured in m 2

(i.e. it has dimension of area), and in the system OFG (oil-field

geology) [k ] – in D (darcy).
pr
-12
2
-8
2
2
2
1 darcy = 1.02·10 cm = 1.02·10 m = 1.02 mcm ≈ 1 mcm .
Permeability coefficient k is expressed in D (darcy) or mD
2
(millidarcy) and has dimension m (dimension of area). Permeability
coefficient depends on sizes and configuration of pore channels gas,
liquid or their mixture filters through and is conditioned by friction
which occurs during fluid filtration through this or that rock.

Besides the installation IV-3 (ВУ-3) (the laboratory experiment
№ 2) and the device GC-5 (ГК-5), such devices, as porosimeters,
permeameters and permeameters-porosimeters are used for

determination of effective porosity factors and absolute permeability
coefficients of rocks. In particular, the table gas (helium) porosimeter
ULTRAPORE-300, the porosimeter-permeameter UltroPoroPerm–
400, the automatic permeameter-porosimeter AP–608 and others are
used in laboratories.

The table gas (helium) porosimeter ULTRAPORE-300. The
sizes of the cells of porosimeter ULTRAPORE-300 are following:
diameters are 25, 30 and 38 mm, the length is up to 6.5 cm. A pressure

sensor of high accuracy with a range from 0 to 1.7 10 6 Pa is used in
this porosimeter. This pressure sensor is characterized by the
linearity and hysteresis of less than ± 0.11 % of the whole scale.

The system can be used in the mode of measuring the porosity or
graininess depending on the configuration of the core holder.
The usage of computer-controlled valves enables to automatize
controlling the process of measuring. At using the core holders
of the system UltraPerm-600 the device enables to measure the pore
volume of the rock samples under the overburden pressure up to

68 10 6 Pa.

The porosimeter-permeameter UltroPoroPerm–400. The
porosimeter-permeameter UltroPoroPerm–400 is applied for

18