Authors: V.V. Shishlyaev, V.P. Pimenov

Title of the article: Assessment of filtration properties of a coal seam and the length of a hydraulic fracturing crack based on the results of quantitative interpretation of injection falloff tests

Year: 2024, Issue: 2, Pages: 35-44

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.03: 552.08

DOI: 10.26730/1999-4125-2024-2-35-44

Abstract: The most important stage in organizing the development of methane-coal deposits is the selection of the most promising seams in the coal-bearing section, which is directly related to the study of the filtration parameters of the seams. In the case of coal seams, in addition to the traditional parameters - porosity and permeability, it is also necessary to determine the fractured compressibility of the seams, which radically affects the productivity of coal methane wells. As in the case of traditional oil and gas reservoirs, the most effective way to assess the filtration properties of coal seams are well testing methods. The purpose of this work is to develop an engineering approach to assessing the initial permeability and fractured compressibility of a coal seam. It is proposed to assess the filtration properties of coal seams as a result of quantitative interpretation of bottomhole pressures obtained during well testing using injection test technology. The interpretation is carried out using a cylindrically symmetric hydrodynamic model of water injection and subsequent well aging, which takes into account changes in fracture porosity and permeability with pressure. Since coal seam hydraulic fracturing is often used to increase the productivity of methane-coal wells, injection tests are also proposed to be carried out after hydraulic fracturing to assess the length of the hydraulic fracture. To quantitatively interpret these tests, a quasi-one-dimensional model of flow in a formation with a hydraulic fracture is developed, which uses the concept of filtration surface area depending on the effective distance to the fracture surface. The approaches developed in the article to assess the filtration parameters of coal seams and the length of the hydraulic fracture are used to determine the filtration characteristics of deep-lying coal seams of the Naryksko-Ostashkinskoye methane-coal deposit in Kuzbass.

Key words: filtration properties coal seam hydraulic fracture injection falloff tests quantitative interpretation

Receiving date: 01.01.1970

Approval date: 15.05.2024

Publication date: 01.01.1970

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