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Eddy current heating oil shale underground in-situ mining method

A technology of eddy current heating and in-situ mining, which is applied in the fields of mining fluid, induction heating, earthwork drilling, etc., can solve the problems of polluting groundwater in the environment, high construction intensity, complex process, etc., achieve high energy utilization rate, accelerate the heating process, The effect of reducing heating costs

Active Publication Date: 2017-02-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the process is complicated, the construction strength is high, and the conductive material may be toxic, polluting the environment and groundwater

Method used

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  • Eddy current heating oil shale underground in-situ mining method
  • Eddy current heating oil shale underground in-situ mining method
  • Eddy current heating oil shale underground in-situ mining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a. If figure 1 As shown, in the Nong'an area of ​​Jilin Province, a target oil shale formation has a burial depth of 60m-70m at three positions, and a gas injection well with a diameter of 500mm is drilled from the surface for 1 to 70m;

[0037] b. Then perform hydraulic fracturing in the 60m-70m section to produce hydraulic fracturing cracks 4, the fracturing radius is not less than 10m, and iron particles 5 with a diameter of 0.8-1mm are used as proppants during fracturing;

[0038] c. Then drill a production well 6 with a diameter of 500mm and a depth of 70m at a position 5m away from the gas injection well on the surface;

[0039] d. Place the eddy current effect strong magnetic field generator 2 connected to the ground power supply 13 through the high temperature cable 12 at the bottom of the gas injection well. The effective length of the eddy current effect strong magnetic field generator 2 in the gas injection well is 10m, and the direction of action is towards ...

Embodiment 2

[0047] a. If figure 2 As shown, in the Huadian area of ​​Jilin Province, a target oil shale formation has a burial depth of 80m-85m at three positions, and a gas injection well with a diameter of 500mm is drilled from the surface for 1 to 85m;

[0048] b. Then perform hydraulic fracturing in the 80m-85m section to produce hydraulic fracturing cracks 4, the fracturing radius is not less than 20m, and iron particles 5 with a diameter of 0.8-1mm are used as proppants during fracturing;

[0049] c. Then drill a production well 6 with a diameter of 500mm and a depth of 85m at a position 12m away from the gas injection well on the surface;

[0050] d. Drill a through horizontal well 14 from the gas injection well 1 to the production well at a depth of 80 meters;

[0051] e. place the eddy current effect strong magnetic field generator 2 connected to the ground power supply 13 through the high temperature cable 12 in the horizontal well 14, the eddy current effect strong magnetic f...

Embodiment 3

[0060] Such as image 3 As shown, the main technical solutions of this embodiment are the same as those of Embodiment 1, and the features not explained in this embodiment are explained in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 is that multiple production wells 6 are used, arranged in a circular array around the gas injection well 1, and the eddy current effect strong magnetic field generator 2 is placed at the bottom of the gas injection well 1, and can be sent to each production well 6 Directional heating; this way of well layout can reduce equipment and engineering investment, thereby reducing costs.

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Abstract

The invention discloses an eddy current heating oil shale underground in-situ mining method. The method comprises the steps that a mining well is drilled from the ground to a target oil shale layer, a propping agent containing ion particles is adopted during fracturing, and the iron particles are pressed into clearances of the oil shale layer; then a gas injection well is drilled again to the target oil shale layer within the fracturing range with the fracturing well as the center; an eddy current effect magnetic field generator is tripped in the well bottom of the gas injection well; nitrogen is introduced into the gas injection well for system internal circulation; the eddy current effect magnetic field generator is started to generate a high-frequency strong magnetic field, the iron particles in the oil shale layer are heated due to the eddy current effect at this moment, and then oil shale is heated to carry out in-situ fracturing on kerogen; nitrogen can carry shale oil and combustible gas and returns to the ground from the mining well, and after oil and the combustible gas are separated through a comprehensive separator, remaining gas is injected into the gas injection well again for circulating. The heating process of the oil shale can be effectively accelerated, the energy utilization rate can be increased, and the heating cost can be reduced.

Description

technical field [0001] The invention relates to a mining technology of oil shale, in particular to an underground in-situ mining method of eddy current heating oil shale, which can obtain shale oil and gas fuel, i.e. combustible gas, in situ from the oil shale. Background technique [0002] At present, the known coal or oil shale underground gasification methods are: drilling, penetration, ignition, blowing and extraction of product gas. The disadvantage of this method is that the obtained combustible gas has a lower calorific value. This is due to the fact that a large amount of steady-flow gas will be mixed into the combustible gas when the organic matter is burned in the underground gasification area. The method is disclosed in Russian Patent No. 2385412, and the classification number is: MnKE21MB43 / 295. [0003] Another known method is: drilling at least one well to a depth penetrating the working interval of the seam; making at least one fracture through the drilling,...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B43/24H05B6/04
CPCE21B43/2405E21B43/267H05B6/04
Inventor 孙友宏刘世畅郭威李强周科吕世东孙中瑾李家晟韩婧赵帅
Owner JILIN UNIV
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