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Volume 3 (2019)

Stydy of the stress state in curving section of the exploitation well at the underground coal gasification

M. Petliovanyi1, V. Lozynskyi1, P. Saik1 & K. Sai1

Purpose

Determination of the stress state of rock massif and an estimation of the curving section stability of the exploitation well at the underground gasification by solving the geomechanical problem using a computational experiment.

Methodology

The calculation of the stress state of rock massif containing a curvilinear well made for the Lviv-Volyn coal basin conditions in the software package SolidWorks, which is based on the finite element method. The geomechanical problem was solved in the elastic approach, the obtained stress values were compared with the maximum admissible mine rock values.

Findings

The geomechanical model of the rock and coal massif containing coal seam n7 b and the exploitation well according to the underground gasification technology has been substantiated and constructed. The increased tensile stresses were determined to concentrate in the roof of the coal seam in the siltstone layer, at the point of entry of the well into the coal seam at a certain angle. The exponential function has been revealed of the tensile stresses value in the roof of the seam from the angle of the producing well entry into the coal seam. The rational angle of a well entry into the coal seam was determined, depending on the boundary to the destruction of the silt strength limit.

This work was supported by the Ministry of Education and Science of Ukraine, grant No 0119U000248.

Keywords: stress state, gasification, modelling, exploitation well, curvature radius

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