Automatic coal-bed gas well drainage and gas recovery device

Abstract

The invention discloses a coalbed methane well automatic drainage gas recovery device, the structure of which comprises a gas well main body, a water outlet pipe, a rock formation, an automatic drainage mechanism, a coal seam, a coalbed methane discharge pipe, and a water pipe outlet. The gas well main body penetrates through the rock formation and is connected to the bottom coal seam , the water outlet pipe runs through the inside of the main body of the gas well, the outlet of the water pipe is arranged on the top of the water outlet pipe, and is fixedly connected by a connector, the coal seam is arranged below the rock layer, and the coalbed methane discharge pipe is arranged above the main body of the gas well, and passed through Bolts are fixed, and the automatic drainage mechanism is composed of a waterproof protective case, a water inlet mechanism, a transmission mechanism, a circuit closing device, and a drainage pump. The waterproof protective case is welded to the side of the drainage pump. The gas device can accurately detect whether there is water seepage at the bottom of the coalbed methane well, and automatically start the drainage pump to drain water, avoiding water flooding and damage caused by untimely detection of drainage, effectively ensuring the normal operation of the coalbed methane well, and helping to increase production.

Description

Technical field [0001] The invention is an automatic drainage gas extraction device for coal bed methane wells, belonging to the field of automatic drainage gas extraction devices for coal bed methane wells. Background technique [0002] Coalbed methane, also known as coalbed adsorption gas, coalbed methane or coal mines. Coalbed methane is an unconventional natural gas that is self-generated and self-storage adsorbed on the surface of coal molecules. It is an emerging potential energy with huge reserves. It is stored in the complex fracture-pore system of coal seams. [0003] Coal bed is not only a reservoir for storing methane, but also a source rock for methane generation. The physical structure of the coal seam is a double pore, that is, there is a pore system of matrix pores and fracture pores in the coal seam, and the fracture pores are composed of primary cleats (face cleats) and secondary cleats (end cleats). Coal-bed methane exists in coal in three states, that is, it is...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an automatic drainage and gas re

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