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Coal seam convection heating system and method for in-situ pyrolysis of oil-rich coal

An in-situ pyrolysis and convection heating technology, which is applied in the fields of mining fluids, earth-moving drilling, surface mining, etc., can solve the problems of poor coal seam temperature uniformity, long coal seam heating cycle, and low overall energy efficiency, and achieves shortened heating cycle and high efficiency. Heating efficiency and energy utilization, the effect of high energy utilization

Active Publication Date: 2021-01-05
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a convective heating system and method for in-situ mining of oil-rich coal in order to solve the problems of long coal seam heating period, poor coal seam temperature uniformity and low overall energy efficiency during in-situ pyrolysis of oil-rich coal

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  • Coal seam convection heating system and method for in-situ pyrolysis of oil-rich coal
  • Coal seam convection heating system and method for in-situ pyrolysis of oil-rich coal
  • Coal seam convection heating system and method for in-situ pyrolysis of oil-rich coal

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] see figure 1 , an in-situ convective high-efficiency energy-saving heating system for coal seams in the process of in-situ pyrolysis (or dry distillation) of oil-rich coal, including a fluid electromagnetic heating device arranged at the bottom of the heat injection well 4 or the production well 15, the heat injection well 4 and the production well The wells 15 are connected through fracturing gaps 12 .

[0034] A power supply box 1 is arranged outside the heat injection well 4 or outside the production well 15. When the fluid electromagnetic heating device is arranged in the heat injection well 4, a power supply box 1 is arranged outside the heat injection well 4. When the fluid electromagnetic heating device is arranged in the production well In the middle of 15, a power supply box 1 is arranged outside the production well 15.

[0035] see figure 2 , the...

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Abstract

The invention discloses a coal seam convection heating system and method for in-situ pyrolysis of oil-rich coal. The system comprises a fluid electromagnetic heating device arranged at the bottom of aheat injection well or a mining well, wherein the heat injection well is communicated with the mining well through a fracturing gap; the fluid electromagnetic heating device comprises a heating cavity, a heating core is arranged in the heating cavity, a heat preservation layer is arranged outside the heating cavity, and a coil assembly is arranged outside the heat preservation layer. When the fluid electromagnetic heating device is arranged in the heat injection well, a gas conveying pipeline is arranged in the heat injection well, the heating cavity is communicated with the bottom of the gasconveying pipeline, and when the coil assembly is powered on, compressed fluid conveyed into the heating cavity through the gas conveying pipeline is heated by the heating core, passes through the fracturing gap and is discharged out of the mining well. By means of the method, the coal seam heating period can be greatly shortened, the coal seam temperature uniformity is improved, high heating efficiency and energy utilization rate are obtained, and pollution to the stratum environment is little.

Description

technical field [0001] The invention relates to the field of oil-rich coal oil and gas resources development, in particular to a coal seam convection heating system and method for in-situ pyrolysis of oil-rich coal. Background technique [0002] Oil-rich coal refers to coal with a tar yield between 7% and 12%. In my country's coal reserves, oil-rich coal accounts for 45%. Through pyrolysis, oil-rich coal can be converted into energy and chemical raw materials such as tar and gas, thereby greatly improving the utilization value of my country's coal resources. At present, the pyrolysis conversion of oil-rich coal is mainly to mine oil-rich coal from the underground to the ground, and after crushing, enter the ground pyrolysis equipment to convert into tar, gas and semi-coke. The poor reactivity of ground pyrolysis semi-coke restricts its large-scale application and causes a large amount of semi-coke to accumulate; at the same time, the discharge of waste water and waste gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/26E21B43/267E21C41/24
CPCE21B43/24E21B43/26E21B43/267E21C41/24Y02P20/129
Inventor 李明杰魏进家吴志强杨伯伦
Owner XI AN JIAOTONG UNIV
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