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Supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system and gas extraction method

A carbon dioxide and gas drainage technology, which is applied in the direction of gas discharge, mining fluids, mining equipment, etc., can solve the problems of increasing extraction costs, energy can not be concentrated, etc., and achieve a good effect of gas extraction

Pending Publication Date: 2019-07-09
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Coal seams are easier to absorb microwave energy than carbon dioxide, and microwaves have good penetrating properties, so microwave energy is mainly used to heat coal seams, and can heat coal seams far away from positive pressure holes. Energy cannot be concentrated in supercritical carbon dioxide, resulting in useless work The phenomenon of more useful work and less work
[0006] The existing positive and negative pressure gas drainage technology has the following defects: intensive drilling is required to ensure the positive and negative pressure drainage effect, which increases the cost of gas extraction

Method used

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  • Supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system and gas extraction method
  • Supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system and gas extraction method
  • Supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system and gas extraction method

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Embodiment Construction

[0041] Such as figure 1 and figure 2 As shown, the supercritical carbon dioxide combined positive and negative pressure interaction combined drainage gas system of the present invention includes a plurality of negative pressure holes 2 uniformly arranged on the coal seam wall 1, and positive pressure holes 2 are arranged in the area surrounded by adjacent negative pressure holes 2. The pressure hole 3; the negative pressure hole 2 is provided with a negative pressure hole sealer 4, and the positive pressure hole 3 is provided with a positive pressure hole sealer 5;

[0042] A extraction pipe 6 is arranged in the negative pressure hole 2, and the extraction pipe 6 extends out of the negative pressure hole sealer 4, and the extraction pipe 6 is connected with a negative pressure branch pipe 7, and each negative pressure branch pipe 7 is connected with a negative pressure main pipe 8 connection; the negative pressure main pipe 8 is connected with a negative pressure pump 9; the...

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Abstract

The invention discloses a supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system. The system comprises a plurality of negative pressure holes evenly formed in a coal seam wall, and positive pressure holes are formed in areas defined by adjacent negative pressure holes. An extraction pipe is arranged in each negative pressure hole, extends out of a negative pressure hole sealing device and is connected with a negative pressure branch pipe, and the negative pressure branch pipes are connected with a negative pressure main pipe; a fracturing pipe and a carbon fiber quartz electric heating pipe are arranged in each positive pressure hole, each fracturing pipe extends out of a positive pressure hole packer, and the fracturing pipes are connected with a positive pressure main pipe; the positive pressure main pipe is connected with a gas storage tank, and a heating box, a booster pump and a pressure release valve are arranged on the positive pressure main pipe between the gas storage tank and the fracturing pipe in series. The invention further discloses a corresponding gas extraction method. The energy utilization rate is high, the supercritical state of carbon dioxide can be kept for a long time, and efficient gas extraction is achieved under the interaction of positive pressure and negative pressure.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage. Background technique [0002] Coal mine gas extraction is an important guarantee for safe production in coal mines, and it is also a need for recovery and utilization of gas. my country's coal seams have the characteristics of high gas adsorption and low permeability, which lead to difficulties in gas extraction and frequent gas accidents. At present, the commonly used gas drainage method needs to arrange dense gas drainage boreholes, which requires a lot of manpower and material resources, and the negative pressure value of a single hole is low. However, hydraulic fracturing technology has poor desorption promotion effect and cannot fundamentally solve the problems of low coal seam permeability and low coal seam gas extraction rate in my country. [0003] Supercritical carbon dioxide refers to a state in which carbon dioxide is heated and pressurized above the critical point (Tc...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/26E21B36/04
CPCE21F7/00E21B43/255E21B43/26E21B36/04
Inventor 王登科魏建平李波张宏图王云刚吴岩张平
Owner HENAN POLYTECHNIC UNIV
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