Microwave-assisted supercritical carbon dioxide cyclic fracturing system and microwave-assisted supercritical carbon dioxide cyclic fracturing method

A technology assisted by carbon dioxide and microwave, applied in earthwork drilling, waveguide devices, gas discharge, etc., can solve problems such as strong penetration of fracturing fluid, holes and cracks entering coal, etc., to promote gas desorption and reduce Fracture pressure, improve the effect of gas drainage

Active Publication Date: 2017-01-04
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

Compared with conventional fracturing fluids, supercritical carbon dioxide fracturing fluid has strong permeability and can easily enter the pores and fissures in coal, thereby creating a fracture network. However, maintaining the supercritical state of carbon dioxide in underground coal mines and effectively recovering it has become the key to its application. technical bottleneck

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  • Microwave-assisted supercritical carbon dioxide cyclic fracturing system and microwave-assisted supercritical carbon dioxide cyclic fracturing method

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Embodiment Construction

[0024] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0025] Such as figure 1 As shown, the microwave-assisted supercritical carbon dioxide circulation fracturing system of the present invention includes a three-phase separator 19 connected to the recovery pipe 10, an air compressor 20 connected to the three-phase separator 19, and a cooling system connected to the air compressor 20. 21 and the liquid carbon dioxide storage tank 18 connected with the cooler 21, the pipeline on the lower side of the liquid carbon dioxide storage tank 18 is connected with a heater 16, and the heater 16 is connected with a booster pump 17 connected with the fracturing pipe 9 through the pipeline. One path is connected with a waveguide converter 12 connected to the coaxial waveguide 8 to form a loop for realizing supercritical carbon dioxide circulation fracturing and forming a fracture network in the coal seam; the coaxial wavegu...

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Abstract

The invention relates to a microwave-assisted supercritical carbon dioxide cyclic fracturing system and a microwave-assisted supercritical carbon dioxide cyclic fracturing method. The microwave-assisted supercritical carbon dioxide cyclic fracturing system comprises a liquid carbon dioxide tank, a heater, a boosting pump, a fracturing pipe, a return pipe, a three-phase separator, an air compressor and a cooler which form a loop to achieve supercritical carbon dioxide cyclic fracturing, and a fracture network is formed in a coal seam. According to the microwave-assisted supercritical carbon dioxide cyclic fracturing method, the coal seam and carbon dioxide are subjected to microwave heating to ensure that the carbon dioxide is in the supercritical state for a long time, and heat effect of microwave heating is capable of fracturing coal masses, dredging pores and promoting gas desorption. The microwave-assisted supercritical carbon dioxide cyclic fracturing system and the microwave-assisted supercritical carbon dioxide cyclic fracturing method have the advantages that the supercritical carbon dioxide high in diffusivity is capable of going deep into coal mass pores and fractures quite easily as well as dispelling gas; operation costs are reduced effectively and the construction technology is simplified effectively through cyclic fracturing; microwave radiation is combined with supercritical carbon dioxide cyclic fracturing to increase porosity and permeability of the coal seam greatly and promote gas desorption, so that gas extraction effects are improved substantially, and the system and the method are highly practical in the field.

Description

technical field [0001] The invention relates to a microwave-assisted supercritical carbon dioxide circulation fracturing system and method, which belong to the related technical field of underground fracturing in coal mines, and are especially suitable for soft and high-gas coal seams. Background technique [0002] The characteristics of high adsorption, microporosity, and low permeability of coal seams in my country make gas drainage difficult and gas accidents occur frequently. As a mature technology, hydraulic fracturing can effectively improve the drainage effect of coal seam gas. However, the existing hydraulic fracturing technology has a single form of fracture, is difficult to form a fracture network, has poor desorption promotion effect, and poor recovery of fracturing fluid. Microwaves can act on polar molecules such as water in the coal body to produce thermal effects, tear the coal body, dredge pores and promote gas desorption. Supercritical carbon dioxide refers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00E21B43/34H01P5/10
CPCE21B43/26E21B43/34E21F7/00H01P5/10
Inventor 李贺林柏泉杨威洪溢都刘统黄展博王瑞
Owner CHINA UNIV OF MINING & TECH
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