Study on the disturbance characteristics and control strategies of coordinated exploitation of superimposed resources of coal and oil‐type gas in Ordos Basin

Abstract

Abstract At present, the coordinated exploitation of coal measures‐associated resources is facing many problems, such as wide range, complex technology, and lack of in‐depth theoretical research. To study and solve the coordinated exploitation of coal and oil‐type gas‐associated superimposed resources, taking Huangling No.2 mine in Ordos Basin as an example, a fluid–solid coupling finite element model for coal mining in associated mines is constructed, and the variation laws of axial stress, displacement, stability and oil‐type gas pressure of each gas reservoir at different advancing distances of coal face are numerically simulated and the disturbance characteristics of the mining coal seam to the gas reservoir are obtained. The fluid–solid coupling finite element model of associated mine extraction is constructed, and the variation laws of axial stress, displacement, stability, and oil‐type gas pressure of the gas reservoir and coal seam when extracted from different gas reservoirs are numerically simulated. The disturbance characteristics of the surface‐extracted gas reservoir to the coal seam are obtained. The study results show that the larger the interval between the gas reservoir and the mining coal seam, the smaller the degree of disturbance, and the pressure relief effect of the oil‐type gas in the gas reservoir is positively related to its displacement; the surface drilling extract oil‐type gas, the oil‐type gas in the underlying gas reservoir will migrate and supplement to the extracted layer, and the plastic area around the extraction well basically appears in the mudstone layer and coal seam, and the gas reservoir near the coal seam has good pressure relief effect. Combined with the mutual disturbance characteristics between gas reservoir extraction and coal seam extraction and the field practice, disturbance control strategies for coordinated exploitation of superimposed resources of coal and oil‐type gas in Ordos Basin are proposed.

Keywords

• associated resources
• coordinated mining
• disturbance characteristics
• oil‐type gas
• resource overlay