Special underground direct-driven discharging and extracting equipment for coal bed gas

Abstract

The invention provides special underground direct-driven discharging and extracting equipment for coal bed gas, and belongs to the technical field of mining. The equipment comprises a sleeve, a motor, a motor protector, a righting bearing component, a screw pump, a special connector, a special axial force supporting mechanism and an oil pipe, wherein the motor is arranged on the bottom part of a pitshaft; a motor output shaft is connected with an input end of a rotor of the screw pump through the motor protector and the righting bearing component; an output end of the rotor of the screw pump is connected with the special axial force supporting mechanism; the special connector consists of an internal shaft and an outer casing; a stator of the screw pump and the special axial force supporting mechanism are connected by the special connector; the oil pipe is connected between a special pithead and the special axial force supporting mechanism; the sleeve is embedded on the inner wall of the pitshaft; all constitutive elements are sheathed in the sleeve. By applying the equipment, a gap at the aspect of discharging and extracting techniques for coal bed gas highly-deviated wells and multi-branch horizontal wells is filled; compared with a traditional discharging and extracting way, the equipment realizes the multiplied increase of gas production; meanwhile, the floor area of the discharging and extracting equipment is decreased.

Description

technical field [0001] The invention relates to a coalbed methane drainage equipment, in particular to a coalbed methane special underground direct drive drainage equipment, which belongs to the field of mining technology. Background technique [0002] Coalbed methane (commonly known as gas), a new type of clean energy, is an unconventional natural gas associated with coal and self-generated and stored in coal seams in an adsorbed state. At present, the mining of coalbed methane generally follows the collection mechanism of "drainage-decompression-gas production", that is, the water in the coal seam is drained through mechanical equipment to reduce the downhole pressure, so that the coalbed methane adsorbed on the inner surface of the pores of the coal matrix is ​​absorbed. It is desorbed and transported to the wellbore through two different methods of diffusion and flow, which not only makes use of clean energy such as coalbed methane, but also greatly reduces the proba...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the disadvantages of the prior art, to provide a method that can solve the problems of traditional oil pumping unit and ground-driven screw pump rod tube wear and large well inclination, and is suitable for multi-branch horizontal wells and large-inclination wells. Coalbed methane special underground direct drive drainage equipment in the way of well drainage

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