Supercritical carbon dioxide sand-carrying coal seam fracturing device and method

A carbon dioxide, supercritical technology, applied in safety devices, container filling methods, container discharge methods, etc., can solve the problems of coal seam moisture freezing, hidden safety hazards in fracturing, complicated processes, etc., and achieve increased permeability and good flow diversion. effect of ability
CN112145145APending Publication Date: 2020-12-29渭南陕煤启辰科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
渭南陕煤启辰科技有限公司
Publication Date
2020-12-29

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Abstract

The invention relates to a supercritical carbon dioxide sand-carrying coal seam fracturing device and method. The supercritical carbon dioxide sand-carrying coal seam fracturing device comprises a liquid CO2 storage tank, a booster pump, a heating device, a high-pressure ejector and a hole packer, wherein the liquid CO2 storage tank is connected with the high-pressure ejector through the booster pump and the heating device; and the high-pressure ejector is connected with the hole packer and further provided with an ejection medium inlet. According to the invention, supercritical CO2 is used asa fracturing fluid, and the extremely strong diffusivity and solubility of the supercritical CO2 are utilized, so that micro-fractures in a coal seam can be communicated with each other, and the airpermeability of the coal seam is improved. Ceramsite is carried to serve as a propping agent, the fractures formed after fracturing can be kept open, the ceramsite has good flow conductivity, and gascan smoothly pass through the ceramsite in the gas extraction process.
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Description

technical field

[0001] The invention relates to a coal seam fracturing device and method, in particular to a supercritical carbon dioxide sand-carrying sand fracturing device and method for coal seam fracturing, belonging to the technical field of coal mine safety mining. Background technique

[0002] At present, the pressure relief and anti-reflection measures adopted by my country for deep high-stress, low-permeability, and high-gas content coal seams mainly include loosening blasting, high-pressure air blasting, hydraulic fracturing, ultra-high pressure hydraulic slotting, Liquid carbon dioxide fracturing anti-permeability and other technologies, but these technologies have the following problems:

[0003] (1): Loosening blasting and high-pressure air blasting consume most of the energy of the explosion on the fragmentation of the coal near the drill hole, so the range of cracks produced by them is very limited.

[0004] (2): Ultra-high pressure hydraulic cutting consumes...

Claims

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