Ground pumping and mining coal seam gas well reformation method based on recurrence frequency impact waves

Abstract

The invention discloses a ground pumping and mining coal seam gas well reformation method based on recurrence frequency impact waves; the method mainly solves the problem that in the prior art, the coal seam is damaged and compacted and the seepage and deabsorption of the coal seam cannot be improved simultaneously. The method comprises the following operation procedures of: (1) pulling out all tubular columns in a well; (2) putting a drift size gauge tool so as to ensure that downhole instruments go through the well without hindrance; (3) continuously infusing a coal bed gas well with underground water exhausted from the well or an adjacent well till water reaches the mouth of a well, and conveying underground equipment of a high energy-gathering high-power electrical pulse device to thecoal seam; (4) dividing the coal seam into a plurality of sections, wherein each section is an operation point; (5) using the underground equipment of the electrical pulse device for carrying out recurrence frequency impact wave treatment on each operation point; (6) pulling out the underground equipment after all the operation points are treated; (7) putting the production tubular column for well completion according to the requirements, and putting the production tubular column into pumping and mining. The method has the advantages that the method does not damage the coal seam and carries out the single-point recurrence frequency operation on the coal seam, and can be used for increasing the yield and production capacity of the coal bed gas well.

Description

technical field [0001] The invention belongs to the field of energy, in particular to a method for reforming the structure of a coal seam, which can be used for vertical wells, inclined wells and open-hole wells for extracting coal bed methane on the ground, and can also be applied to the reformation of coal seams in horizontal drainage holes in mines. Background technique [0002] Coal is the conventional energy with the largest reserves and the widest distribution in the world, accounting for 29% of primary energy consumption. my country is rich in coal resources, with coal reserves of more than 1 trillion tons, and is the world's largest coal producer and consumer. The proportion of domestic coal in energy production and consumption has been more than 70%, and it is expected that by 2050, it will still account for more than 60%. [0003] The gas (coal bed methane) disaster in coal production is the major vicious accident with the largest casualties and losses and the mos...

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Problems solved by technology

[0007] First of all, because the traditional method of improving oil and gas reservoirs is to inject more or less foreign matter into the coal seam, it will inevitably cause damage to the coal seam; secondly, the static pressure of hydraulic fracturing may cause the coal seam to be compacted, resulting in no production of coalbed methane wells. Thirdly, hydraulic fracturing is only to improve the coal seam seepage channel and expand the desorption area, and has no effect on improving the coal seam desorption capacity and inhibiting the coal seam adsorption capacity

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