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Coaxial heating microwave antenna with H-shaped cracks, and cluster type microwave antenna

A microwave antenna and coaxial heating technology, which can be applied to antenna equipment with additional functions, leaky waveguide antennas, antenna arrays with separate power supply, etc., can solve the problems of less research on the structural design of electromagnetic wave heaters, etc.

Pending Publication Date: 2021-05-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, domestic and foreign researches are mostly focused on the research of microwave antenna heating of heavy oil and the mechanism of microwave heating of natural gas hydrate, but there are few studies on the structural design of specific electromagnetic wave heaters for microwave heating of natural gas hydrate

Method used

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  • Coaxial heating microwave antenna with H-shaped cracks, and cluster type microwave antenna
  • Coaxial heating microwave antenna with H-shaped cracks, and cluster type microwave antenna
  • Coaxial heating microwave antenna with H-shaped cracks, and cluster type microwave antenna

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Embodiment 1

[0074] The coaxial heating microwave antenna with H-shaped cracks designed by the present invention is used to solve the secondary generation problem in the exploitation of natural gas hydrate in the Shenhu sea area. The microwave with a frequency of 2.45 GHz is sent out by the microwave generator and transported to the electromagnetic wave through the transmission system. The heater acts on gas hydrates. Use the three-pin adjuster to control the reflected microwave power to ensure the change of the standing wave coefficient of the load and ensure the best microwave transmission of the system. The curved waveguide is used to change the direction of microwave transmission. The whole set of electromagnetic wave heater power supply, microwave generator system, micro-control system, waveguide and other devices are placed on the ground, and the designed coaxial heating microwave antenna with H-shaped cracks is lowered to the wellbore through a coaxial cable. Work under the working...

Embodiment 2

[0076] The main technical solution of this embodiment is the same as that of Embodiment 1, the difference between the two is that the integrated cluster microwave antenna is lowered into the production pipeline to heat the secondary-generated natural gas hydrate in the production shaft with a larger diameter, Improve the heating efficiency and expand the heating range.

[0077] The pressure-resistant and waterproof coaxial heating microwave antenna of the H-shaped crack 4 designed in the present invention utilizes the advantage of microwave heating to act on the secondary-generated natural gas hydrate to solve problems such as blockage in the process of natural gas hydrate exploitation.

[0078] The diameters of the inner conductor 1 and the outer conductor 2 described in the present invention can be adjusted according to different microwave frequencies and ambient temperature and pressure, so as to be suitable for microwave heating in different environments.

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Abstract

The invention discloses a coaxial heating microwave antenna with H-shaped cracks, and a cluster type microwave antenna, and belongs to the technical field of natural gas hydrate exploitation. The coaxial heating microwave antenna comprises an inner conductor, an outer conductor and a filling medium, the inner conductor is coaxially arranged in the outer conductor, and the inner conductor extends out of the outer conductor at the microwave output port side of the antenna; the filling medium is filled between the inner conductor and the outer conductor; and the H-shaped cracks are formed in the outer conductor, at least two circles of H-shaped cracks are distributed in the axial direction of the outer conductor in an equal-amplitude in-phase feed mode, and four H-shaped cracks are evenly distributed in each circle. The antenna provided by the invention can ensure that the microwave with the frequency of 2.45 GHz can heat the secondarily generated natural gas hydrate through crack radiation, only the microwave of the TEM mode is transmitted, and the antenna is used for efficiently heating the secondarily generated natural gas hydrate in a long-distance low-loss manner.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate exploitation, and in particular relates to a coaxial heating microwave antenna and a cluster microwave antenna with H-shaped cracks. Background technique [0002] At present, depressurization method is one of the commonly used extraction methods of natural gas hydrate. Studies have shown that in the subsequent stage of natural gas hydrate exploitation by depressurization method, the heat supply will be insufficient due to the large amount of heat absorption of natural gas hydrate in the early stage. Due to the existence of the Joule-Thomson effect, water and natural gas will It is very easy to cause natural gas hydrate to regenerate in the reservoir gas production channel, wellbore, blowout preventer (BOP), throttle pipeline and other parts. Severe blockage will affect the gas migration rate and even block the gas migration channel, resulting in gas production rate. Risk of decline or...

Claims

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Application Information

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IPC IPC(8): H01Q1/44H01Q13/20H01Q1/50H01Q21/06H01Q1/00H05B6/72
CPCH01Q1/44H01Q13/203H01Q1/50H01Q1/002H01Q21/06H05B6/72
Inventor 刘宝昌王姝婧梁金强朱月常思
Owner JILIN UNIV