Ultrasonic excitation and hydraulic slotting integrated device, compound intensified gas extraction system and method

Abstract

The invention discloses an ultrasonic excitation and hydraulic slotting integrated device, a compound intensified gas extraction system and method. The ultrasonic excitation and hydraulic slotting integrated device comprises a sleeve, a hydraulic slotting drill bit is fixed to the top of the sleeve, and a plurality of hydraulic slotting drill bit jet holes are formed in the circumferential direction of the hydraulic slotting drill bit; and the bottom of the sleeve is connected to a high pressure pump through a high-pressure hose, an ultrasonic transducer is arranged on the lower portion of thehydraulic slotting drill bit, the sleeve is sleeved with the ultrasonic transducer, and the ultrasonic transducer is connected to an ultrasonic generator through a cable. According to the ultrasonicexcitation and hydraulic slotting integrated device, advantage complementation of two single technologies is achieved through organic combination of ultrasonic excitation and hydraulic slotting, coalseam gas desorption is effectively promoted, the coal seam permeability is increased, the technical problem of mine gas extraction is solved, and the ultrasonic excitation and hydraulic slotting integrated device is applicable to various complicated geologic conditions, and has the wide application range.

Description

technical field [0001] The invention relates to the technical field of coal mine gas control, in particular to an ultrasonic excitation and hydraulic slotting integrated device, a composite enhanced gas drainage system and a method. Background technique [0002] The geological conditions of my country's coalbed methane occurrence are complicated, the coalbed methane permeability is low, and the gas content is high, which makes it difficult to extract gas, which seriously restricts the safe and efficient recovery of mines. 13 m 3 , the development and utilization of this part of resources can not only effectively reduce the atmospheric greenhouse effect, but also reduce coal mine gas disasters. [0003] In order to extract coal seam gas efficiently, scholars at home and abroad have carried out a large number of researches on coal seam gas incentive mining technology, mainly including: artificial caving, hydraulic slotting, hydraulic fracturing, gas injection and physical fie...

AI Technical Summary

Problems solved by technology

However, limited by the characteristics of mechanical waves, the propagation and attenuation speed of ultrasonic waves in the coal body is fast, so its seam-making effect is limited

[0005] The hydraulic slotting technology uses high-pressure water jets to cut a horizontal pressure relief groove with a certain width and thickness to form coal fracture channels. After infiltrating the coal body, it blocks the microscopic pores in the coal body, which is not conducive to gas desorption. At the same time, the water in the crack channels of the coal body also hinders the diffusion of coal seam gas

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