Resistance wire type coal seam heating device

Abstract

The invention provides a resistance wire type coal seam heating device. The device comprises a mobile ground power generation system and a plurality of downhole heaters, wherein the mobile ground power generation system provides electric energy for the downhole heaters; each downhole heater comprises a coal seam upper permanent joint, a reinforcement pipe, an upper resistance wire and a lower resistance wire; the coal seam upper permanent joint is formed by an upper cylinder and a lower square cylinder; a square groove is formed in the top of the cylinder; an installing hole is formed in the square cylinder; two fracturing fluid inlet pipe joints are connected at the side parts of the coal seam upper permanent joint; a square joint is assembled in the square groove; the lower end face of the square joint is connected with an installing pipe penetrating through the installing hole; the upper resistance wire is arranged at the upper part of the reinforcement pipe in a sleeving manner and the lower resistance wire is arranged at the lower part of the reinforcement pipe in a sleeving manner. The device has the beneficial effects that the device adopts the method of injecting thermal fracturing fluid; the resistance wires are adopted by heating equipment for heating; a mobile ground power supply vehicle is adopted as main power supply equipment; the device has the advantages of convenience in operation, diverse functions, safety and reliability and capability of fully increasing the gas output.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas extraction, in particular to a resistance wire type coal bed heating device. Background technique [0002] In order to efficiently discharge the gas in the coal seam, the coal seam is often heated to make the gas escape from the coal seam as soon as possible. Therefore, there are various methods of coal seam heating, including pressurization, hot water injection, and high-pressure hot water steam injection. , the patent number is 200810079794.X, and the invention patent titled "Method for Heating Coal Seam Drainage of Coal Bed Methane" discloses a method for injecting high-temperature and high-pressure steam to heat the coal seam. This method is relatively simple, and water is used as There are abundant sources of media, and it is more convenient to inject underground, but it is necessary to add additional heating equipment on the ground to heat the water to the operating temperature, which m...

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Problems solved by technology

[0002] In order to efficiently discharge the gas in the coal seam, the coal seam is often heated to make the gas escape from the coal seam as soon as possible. Therefore, there are various methods of coal seam heating, including pressurization, hot water injection, and high-pressure hot water steam injection. , the patent number is 200810079794.X, and the invention patent titled "Method for Heating Coal Seam Drainage of Coal Bed Methane" discloses a method for injecting high-temperature and high-pressure steam to heat the coal seam. This method is relatively simple, and water is used as There are abundant sources of media, and it is more convenient to inject underground, but it is necessary to add additional heating equipment on the ground to heat the water to the operating temperature, which makes the ground equipment more complicated

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