Electromagnetic heat-radiation coal bed permeability improvement drill rod device and using method thereof

Abstract

The invention provides an electromagnetic heat-radiation coal bed permeability improvement drill rod device and a using method thereof. The electromagnetic heat-radiation coal bed permeability improvement drill rod device comprises a hollow drill rod and at least one electromagnetic wave generation device arranged on the drill rod. Sieve holes are formed in the position, close to the electromagnetic wave generation device, of the drill rod. A water inflow channel and a water outflow channel are formed in the drill rod. The electromagnetic wave generation device comprises a shell. A cathode filament is arranged in the center of the interior of the shell. An anode resonant cavity is formed in the periphery of the cathode filament in a surrounding mode. Electromagnets are arranged at the upper end and the lower end of the anode resonant cavity correspondingly. A waveguide tube is arranged in the middle of the periphery of the anode resonant cavity in a surrounding mode. Cooling cavities are formed in the upper side and the lower side of the waveguide tube. The bottoms of the cooling cavities are connected to the water inflow channel and the water outflow channel. A transmitting hole is formed in the periphery of the anode resonant cavity in the radial direction. One end of the transmitting hole is connected to the anode resonant cavity, and the other end of the transmitting hole penetrates through the waveguide tube and the shell to communicate with the outside. A transmitting antenna is arranged in the transmitting hole. A coal bed is heated through electromagnetic waves emitted by the electromagnetic wave generation device, so that the permeability of the coal bed is improved, and gas extraction is promoted.

Description

technical field [0001] The invention relates to the technical field of mining equipment, in particular to an electromagnetic heat radiation coal seam anti-reflection drill pipe device and a use method thereof. Background technique [0002] Coal is the basic energy of our country, accounting for about 70% of the primary energy. Low permeability is the basic characteristic of my country's coal reservoirs, and it is also one of the difficulties hindering my country's coal seam gas extraction. The permeability of coal seams in my country is generally (0.1~0.001)×10 -3 μm 2 Even the Fushun coalfield with the highest penetration rate in China is only (0.54-3.8)×10 -3 μm 2 . The gas permeability of the coal seam directly determines the effect of gas drainage. With the gradual increase of the mining depth of coal mines in my country, the mining conditions are becoming more and more complex, and the characteristics of high ground stress, high gas, high heterogeneity, and low per...

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Problems solved by technology

The gas permeability of the coal seam directly determines the effect of gas drainage. With the gradual increase of the mining depth of coal mines in my country, the mining conditions are becoming more and more complex, and the characteristics of high ground stress, high gas, high heterogeneity, and low permeability appear. The primary fractures and porosity of the coal body gradually become smaller, the air permeability of the coal seam decreases accordingly, the effective influence range of a single drilling hole is small, the pre-drainage drilling engineering volume is large, and the drainage efficiency is low

[0003] In order to improve the permeability of low-permeability coal reservoirs and enhance the gas desorption-diffusion-seepage velocity of low-permeability coal seams, many researchers at home and abroad have proposed a variety of methods and technical approaches for low-permeability coal seam permeability enhancement and gas extraction, which mainly include mining protection layer, hydraulic fracturing, hydraulic slotting, deep hole pre-splitting blasting, N 2 Foam fracturing, CO 2 Fracturing, etc. have achieved some results in some areas, but due to the influence of construction conditions, engineering materials, desorption speed and other factors, the effects of anti-reflection and pumping promotion are not very ideal

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