Authors: A.G. Shevtsov, V.A. Khyamyalyaynen

Title of the article: Geomechanical estimation of hydraulic fracture's influence on permeability of coal seam in conditions of Kuzbass

Year: 2018, Issue: 6, Pages: 15-19

Branch of knowledge: Earth sciences

Index UDK: 622.324.5

DOI: 10.26730/1999-4125-2018-6-15-19

Abstract: In coalbed methane production, the most common technology for increasing permeability of reservoir is hydraulic fracturing. With the implementation of this technology in coal seam is the expansion of natural cleats and the formation of a new network of fractures. In this article, the influence of hydraulic fractures of coal seams on the stress-strain state of the rock massif in the conditions of the Kuznetsk coal basin is investi-gated by the method of numerical geomechanical modeling using the ANSYS software. Calculations were car-ried out for four fracturing cases, a comparative analysis of modeling results was carried out. The results of the analysis showed that hydraulic fractures of the same geometry under different conditions lead to different stress changes. Estimated permeability changes of the target coal seams in results of the formation of hydraulic fractures, identified areas of high and low permeability. The obtained results allow us to conclude that for the effective extraction of coalbed methane with the use of hydraulic fracturing technology it is necessary to create extended fractures that will cause the unloading of the coal seam from stresses and increase its permeability. The presence in the massif of higher and lower coal seams of low thickness due to the unloading of the massif as a whole, will also contribute to the production of the well even without hydraulic fracturing. Of interest is the continuation of work in the part of the study of the impact on the stress-strain state of the coal seam and its permeability of various constructions of coalbed methane wells.

Key words: coalbed methane coal seam permeability hydraulic fracturing fracture stress-strain state geomechanical modeling

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