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Downhole eddy current heater

A heater and eddy current technology, applied in the direction of induction heating, mining fluid, wellbore/well parts, etc., can solve the problems of low heating rate, large fluid pressure loss, poor sealing effect of heater outlet, etc., to improve heating rate, Effect of reducing pressure loss and reducing processing difficulty

Pending Publication Date: 2018-07-31
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a downhole eddy current heater, which solves the problems of low heating rate, large fluid pressure loss, and poor sealing effect of the heater outlet in the existing downhole heater.

Method used

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  • Downhole eddy current heater
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Embodiment Construction

[0025] see figure 1 and figure 2 As shown, the present invention includes a housing 1, a continuous spiral cavity 2, a central tube 3, a sealing cover 4, an insulating layer 5, an eddy current coil 6, a power line channel 7, a coil temperature sensor 8 and a one-way valve 9;

[0026] The upper part of the shell 1 is provided with a tapered internal thread, which is used to connect with the center pipe 3 and plays a sealing role; the lower part of the tapered internal thread is provided with a step, which is used to place the gasket 11, and the connection between the shell 1 and the central pipe is fixed. seal.

[0027] The lower part of the housing 1 is provided with a tapered external thread for connecting with the one-way valve 9; the lower part of the housing 1 is provided with a tapered hole for cooperating with the upper valve body 92 to seal the outlet of the heater and prevent backflow of downhole fluid. The upper part of the tapered external thread is the heating se...

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Abstract

The invention discloses a downhole eddy current heater comprising a shell, a continuous spiral cavity, a central pipe, a sealing cover, a power line channel, an electric eddy current coil, an insulating layer and a one-way valve. The electric eddy current effect is utilized to heat a fluid indirectly, and by combining the electric eddy current effect, boiling heat transfer of liquid sodium in thecentral pipe and the continuous spiral cavity, and a continuous spiral channel in the shell, the heating rate of the downhole fluid can be greatly increased; and in the downhole operation process of the heater, two-level linkage seal of a heater outlet is achieved by changing an input current, and the downhole fluid can be effectively prevented from flowing back to the heater.

Description

technical field [0001] The invention relates to a downhole eddy current heater, in particular to unconventional energy fields such as oil shale, heavy oil, heavy oil, oil sand, natural gas hydrate and the like. Background technique [0002] The current utilization technologies of underground hydrocarbon resources are divided into surface utilization technologies and in-situ conversion technologies. Surface utilization technology is a relatively mature underground hydrocarbon resource development technology at present, but surface utilization technology has disadvantages such as high mining costs, large air and groundwater pollution, and large water consumption; it is not suitable for deep hydrocarbon resource exploitation. In-situ conversion technology refers to the in-situ heat treatment of underground hydrocarbon deposits to pyrolyze underground hydrocarbon resources. The in-situ conversion technology has the advantages of not damaging the surface, no pollution to the env...

Claims

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Application Information

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IPC IPC(8): E21B43/24H05B6/36
CPCH05B6/36E21B43/2401Y02E10/10
Inventor 郭威王振东孙友宏李强邓孙华张鹏宇赵帅陈强刘召
Owner JILIN UNIV