Geomechanical factor of the intake of additional capacities of free methane at the exploitation of gas deposits

1Bulat, AF, Lukinov, VV, Bezruchko, KA, Krukovskyi, OP, Krukovska, VV
1M.S. Polyakov Institute of Geotechnical Mechanics of the NAS of Ukraine, Dnipropetrovsk
Dopov. Nac. akad. nauk Ukr. 2018, 8:25-35
Section: Mechanics
Language: Ukrainian
Abstract: 

The hypothesis of forming a fracture-porous structure of secondary rocks on the gas-deposit development as a result of a decrease of the gas pressure and the development of compression deformations in a productive re- servoir, which stipulate deformations of tension in a low-porous reservoir, assisting the redistribution of water and the gas, and forming the technogenic reservoir in it, is proposed. A mathematical model for the simulation of processes occurring at the development of a gas deposit is developed. The numerical simulation of changes of geomechanical and filtration parameters for the test model of a gas deposit is executed. It is shown that the con- siderable decrease of the gas pressure at the long-term exploitation of a deposit stipulates the deformation of higher- and underlying rock strata. The enhanced variability of the stress field creates an increase in the permeability near-by a layer-reservoir at the reserve depletion of hydrocarbons. If there is a low-porous reservoir in the area of enhanced variability, its gas recovery will grow, being conditioned by an increase in the permeability.

Keywords: gas deposits, gas filtration, geological and geomechanical processes, numerical simulation, rock massif deformation
References: 
  1. Maievskyi, B. Y., Kurovets, S. S., Lozynskyi, O. Y., Khomin, V. R., Zderka, T. V. & Maniuk, M. I. (2014). Actual problems of oil-gas geology. Ivano-Frankivsk: IFNTUNG (in Ukrainian).
  2. Kryvulia, S. V. (2014). Criteriones of supplementary exploration of great hydrocarbons in the lowerpermian-uppercarboniferous sediments of Dnieper-Donets depression. Kharkiv: TO Exclusive (in Ukrainian).
  3. Zakirov, S. N., Zhabrev, I. P. & Politykina, M. A. (1986). Superreservoires and their role in a management by the working mines system. Geologiya nefti i gaza, No. 8, pp. 1-6 (in Russian).
  4. Ivanishin, V. S. (2003). Oil-gas-development geology. Lviv: Evrosvit (in Ukrainian).
  5. Khanin. A. A. (1969). Rock-reservoires oil and gas and their study. Moscow: Nedra (in Russian).
  6. Lukinov, V. V. & Pymonenko, L. I. (2008). Tectonics of methan-coal deposits of Donbas. Kiev: Naukova Dumka (in Russian).
  7. Bulat, A. F. & Bezruchko, K. A. (2015). System water—gas in the massif of rocks of Donbas. Kiev: Naukova Dumka (in Russian).
  8. Bulat, A. F., Lukinov, V. V. & Bezruchko, K. A. (2017). Conditions of gas traps forming in carboniferous sediments. Kiev: Naukova Dumka (in Ukrainian).
  9. Lukinov, V. V. (2007). Mining-geological conditions of formation of free methane accumulations in coal deposits. Naykovyi visnyk NGU, No. 4, pp. 55-59 (in Russian).
  10. Bezruchko, K. A. (2010). Interaction of phase in the “water-gas” system in rocks and forming the natural gas accumulations. Heolohiya i heokhimiya horyuchykh kopalyn, No. 2 (151), pp. 5-22 (in Ukrainian).
  11. Kuuskraa, V. A. (2000). Decrease of methane emission in coal mines: Warrior and Kuznetsk basins. Sbornik dokladov II Mezhdunarodnoj konferencii "Sokrashhenie jemissii metana". Novosibirsk: SO RAN, pp. 451-459 (in Russian).
  12. Trubetskoy, K. N., Guryanov, V. V. (2006). Intensification of gas recovery of coal seams on the basis of their stress-strain state regulation. Ugol, No. 2, pp. 64-66 (in Russian).
  13. Bondar, A. L, Subbotin, I. E. & Oleksuk, V. I. (1992). Problems of study of deformations of the land surface at development of Shebelinka deposit. Naftova ta hazova promyslovist, No. 1, pp. 19-21 (in Russian)
  14. Krukovskiy, A. P. & Krukovskaya, V. V. (2015). Change of geomechanical parameters of gas-saturated coal-rock massif at the gas-dynamic occurrences. Geotechnical Mechanics, No. 122, pp. 57-66 (in Russian).
  15. Krukovskaya, V. V. (2015). Simulation of coupled processes occurring in coal rock massif at mining operations. Geotechnical Mechanics, No. 121, pp. 48-99 (in Russian)