ISSN 1062-7391, Journal of Mining Science, 2017, Vol. 53, No. 5, pp. 954–961. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © S.V. Serdyukov, T.V. Shilova, A.N. Drobckik, 2017, published in Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh,
2017, No. 5, pp. 172–180.
__________________________ NEW METHODS AND INSTRUMENTS ___________________
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Laboratory Installation and Procedure
to Determine Gas Permeability of Rocks
S. V. Serdyukov*, T. V. Shilova, and A. N. Drobchik
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
Received August 28, 2017
Abstract—The article presents the installation meant for the determination of gas permeability of rock
specimens placed in a testing cell with the adjustable axial and lateral compression. The installation includes
a measurement system for the automated long-term investigation of rock permeability in accordance with
the preset program. It is also possible to test specimens with a fracture filled with a propping material. The
reported data of the permeability tests of porous quartz-containing material and coal demonstrate the
capacity of the installation and the experimentation specificity.
Keywords: Rock tests, permeability, laboratory installation, high-pressure cell, coal, porous sandstone,
Determination of gas permeability coefficient is one of the standard lab experiments to investigate
properties of rocks in mining and underground construction [1–3]. Full-scale investigation of
permeability and man-made impact on it is an obligatory part of development of technologies for oil
and gas recovery enhancement [4, 5], coalbed gas drainage [6, 7], protection of underground
excavations from ground water inrush by impermeable screens [8–10], etc.
A document regulating the method and means of laboratory-scale determination of rock
permeability to gas (excluding loose rocks) during stationary and nonstationary linear and radial gas
flow in Russia is the state standard GOST 26450.2-85  that sets the following requirements of
measurements: lateral compression of a specimen is not more than 2.5 MPa, gas pressure
at the flow outlet is equal to the atmospheric pressure, differential pressure in the specimen
MPa. At the same time, the average gas pressure in the specimen is by a negligible
margin higher than the atmospheric pressure which is far different from the conditions of natural
occurrence of rocks. It has experimentally been proved that under such low pressures, gas slippage is
possible (Klinkenberg effect), which depends on the properties of rocks and results in the violation of
the Darcy law [12–14]. The procedure recommended for the extrapolation of the measurement data in
the region of reservoir pressures  is based on plotting the relationship between the permeability
coefficient and inverse value of average gas pressure in a specimen. The procedure error estimation is
omitted in . A question is, whether this approach is applicable to determine gas permeability
coefficient under conditions conformable with the rock occurrence environment and to study man-
made effects on fluid-loss properties of rock mass.
Aimed to answer the question, a laboratory installation has been designed, which allows wider
range individual adjustment of average and differential pressure of gas in a cylindrical rock specimen,
as well as the axial and lateral compression of the specimen to simulate in-situ conditions. The
description and specifications of the installation are given in this article.