Gas flow patterns in rock samples

The article discusses permeability testing of rock samples (coal, sandstone, dolomite) using methane, nitrogen and helium. Gas was fed under pressure at one side of a sample, and the other side of the sample was closed for gas flow. Gas filled the sample with time, gas flow stopped, and equilibrium settled in the sample. Gases were fed at different inlet pressures, and the nonstationary time dependences of pressure were recorded at the sample inlet and outlet. As a rule, in the final equilibrium, pressure became constant at the inlet and outlet, and in the whole sample. However, in some cases of inlet pressure variations, the pressures at the sides of the sample after equilibration differed a few times. The found patterns of flow mass transfer are probably connected with gas adsorption in the samples. The tests can be a basis for a cardinally new approach to permeability determination in porous materials using the nonstationary flow laws. This is valid in full measure if non-adsorbable gases are used in the permeation tests.

Keywords: permeation, rock, permeability, adsorption, desorption, gas pressure, nonstationary and stationary flow modes.
For citation:

Averin A. P., Belousov F. S., Pashichev B. N., Trofimov V. A. Gas flow patterns in rock samples. MIAB. Mining Inf. Anal. Bull. 2021;(10):100-111. [In Russ]. DOI: 10.25018/0236_1493_2021_10_0_100.


Исследование выполнено при поддержке Министерства науки и высшего образования Российской Федерации, Соглашение №075-15-2021-943 и European Commission Research Fund for Coal and Steel (RFCS) funded project "Advanced methane drainage strategy employing underground directional drilling technology for major risk prevention and greenhouse gases emission mitigation" GA: 847338 — DD-MET — RFCS-2018/RFCS-2018

Issue number: 10
Year: 2021
Page number: 100-111
ISBN: 0236-1493
UDK: 532.685
DOI: 10.25018/0236_1493_2021_10_0_100
Article receipt date: 24.06.2021
Date of review receipt: 12.07.2021
Date of the editorial board′s decision on the article′s publishing: 10.09.2021
About authors:

A.P. Averin1, Cand. Sci. (Eng.), Senior Researcher,
F.S. Belousov1, Researcher,
B.N. Pashichev1, Researcher,
V.A. Trofimov1, Dr. Sci. (Eng.), Chief Researcher, e-mail:,
1 Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia.


For contacts:

V.A. Trofimov, e-mail:


1. Bo Lia, Yunpei Lianga, Lei Zhangb, Quanle Zoua Experimental investigation on compaction characteristics and permeability evolution of broken coal. International Journal of Rock Mechanics and Mining Sciences. 2019, vol. 118, pp. 63–76.

2. Yubing Liua, Guangzhi Yina, Dongming Zhanga,Minghui Lia, Bozhi Denga, Chao Liua, Honggang Zhaoa, Siyu Yina Directional permeability evolution in intact and fractured coal subjected to true-triaxial stresses under dry and water-saturated conditions. International Journal of Rock Mechanics and Mining Sciences. 2019, vol. 119, pp. 22–34.

3. Zou Q. L. Lin B. Q. Fluid-solid coupling characteristics of gas-bearing coal subject to hydraulic slotting: an experimental investigation. Energy Fuels. 2018, vol. 32, pp. 1047–1060.

4. Li B., Zou Q., Liang Y. Experimental research into the evolution of permeability in a broken coal mass under cyclic loading and unloading conditions. Applied Sciences. 2019, vol. 9, pp. 762.

5. Chu T., Yu M., Jiang D. Experimental Investigation on the permeability evolution of compacted broken coal. Transport Porous Media. 2016, vol. 116, pp. 1–22.

6. Makeeva T. G., Trofimov V. A. Determination of gas permeability of rocks in conditions of non-stationary filtration. Estestvennye i tekhnicheskie nauki. 2021, no. 1, pp. 90—98. [In Russ].

7. Trofimov V. A. Determination of the permeability of low-permeability geomaterials. Problemy i perspektivy kompleksnogo osvoeniya i sohraneniya zemnyh nedr [Problems and prospects of integrated development and conservation of the Earth's subsurface], Moscow, IPKON RAN, 2018, pp. 86—89.

8. Kuznetsov S. V., Trofimov V. A. About one method for determining the permeability of coals. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2007, no. 6, pp. 3—9. [In Russ].

9. Kuznetsov S. V. Prirodnaya pronicaemost' ugol'nyh plastov i metody ee opredeleniya [Natural permeability of coal seams and methods for its determination], Moscow, Nauka, 1978, 122 p.

10. Fan J. J., Feng R. M., Wang J., Wang Y. P. Laboratory investigation of coal deformation behavior and its influence on permeability evolution during methane displacement by CO2. Rock Mechanics and Rock Engineering. 2017, vol. 50, pp. 1725–1737.

11. Zaharov V. N., Malinnikova O. N., Filippov Yu. A., Trofimov V. A. Dependence of coal permeability on gas content and acting stresses. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2016, no. 2, pp. 16—25. [In Russ].

12. Barenblatt G. I., Entov V. M., Ryzhik V. M. Dvizhenie zhidkostey i gazov v prirodnyh plastah [The movement of liquids and gases in natural formations], Moscow, Nedra, 1984, 211 p.

13. Rihtmajer R., Morton K. Raznostnye metody resheniya kraevyh zadach [Difference methods for solving boundary value problems], Moscow, Mir, 1972, 420 p.

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.