Expansion-hose hydraulic fracturing method for coal seam permeability increasing

Abstract

The invention discloses an expansion-hose hydraulic fracturing method for coal seam permeability increasing. The expansion-hose hydraulic fracturing method for coal seam permeability increasing comprises the five steps of assembling a hydraulic fracturing system, drilling a coal seam, arranging expansion hoses, fracturing and carrying out pressure relief. According to the expansion-hose hydraulicfracturing method for coal seam permeability increasing, the expansion hoses in hydraulic fracturing drilled holes are expanded through high-pressure water provided by a high-pressure pump, fracture structures of the coal seam are damaged under the action of the expansion hoses to form cracks, so that the effects of permeability increasing and pressure relief are achieved; and the method avoids aphenomenon that water blocks air holes, in general hydraulic fracturing methods simultaneously, avoids waste for water resources, and solves the problem of difficult gas extraction for a soft coal seam with low permeability and high gas concentration at present.

Description

technical field [0001] The invention relates to the technical field of anti-permeability of high-gas concentration coal seams, in particular to an expansion hose type hydraulic fracturing method for anti-permeability of coal seams. Background technique [0002] my country's coal has poor geological conditions, low hardness, high gas content and poor air permeability. As the mining depth increases, the gas permeability of the coal seam becomes worse, the difficulty of gas extraction increases, and the extraction efficiency is low. Due to the softness of the coal seam, problems such as hole collapse, injection holes, and stuck holes are prone to occur during gas lottery drilling, which seriously affects the safe production of the mine. The hydraulic fracturing technology can reduce the drilling pressure, improve the air permeability of the coal seam, and expand the range of pressure relief, and has been widely used in recent years. At present, hydraulic fracturing technology...

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Problems solved by technology

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide an expansion hose type hydraulic fracturing method for coal seam anti-permeability, which uses the expansion hose to prevent water from clogging the pores, and eliminates the waste of water resources, thereby solving the current Difficult gas extraction in soft coal seams with low permeability and high gas concentration

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