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A method for synergistic in-situ mining of oil shale and coal interbeds

An in-situ mining and oil shale technology, which is applied in the fields of mining fluid, coal gasification, and earth drilling, can solve problems such as environmental pollution and waste of resources, improve pyrolysis efficiency, reduce waste of resources, and improve microwave heating. The effect of solution efficiency and product quality

Active Publication Date: 2022-03-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention solves the problem of waste of resources and environmental pollution caused by mechanical methods of oil shale under coal-associated conditions, and adopts the in-situ co-pyrolysis method of microwave heating to convert mechanical physical mining into electromagnetic mining. Chemical pyrolysis mining changes from physical coal mining to chemical gas extraction, which reduces unnecessary heat energy consumption, improves the pyrolysis efficiency of oil shale and coal, increases the quality grade of pyrolysis products, and reduces environmental pollution

Method used

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  • A method for synergistic in-situ mining of oil shale and coal interbeds
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  • A method for synergistic in-situ mining of oil shale and coal interbeds

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Judging the burial depth of interbedded oil shale and coal, as well as the associated interface of the two, through the logging interpretation curve, such as figure 1 shown;

[0040] (2) Through the coaxial cable, the microwave generated on the ground is transmitted to the underground;

[0041] (3) see figure 2 ( figure 2 The right side is the schematic diagram of the antenna installed in the wellbore), and the microwave antenna is aimed at the oil shale layer 2 in the middle layer (because the pyrolysis temperature of oil shale is higher than the low-temperature pyrolysis temperature of coal seam, the oil shale can be used to Heating and co-pyrolysis of the nearby coal seam in the high temperature area), turning on the microwave source, and radiating heating of the oil shale;

[0042] Specifically, the power of the microwave emission source is set to 400W, and the electric field strength can reach a maximum value of 2310V / m;

[0043] (4) Heat the oil shale to...

Embodiment 2

[0049] (1) Judging the burial depth of interbedded oil shale and coal, as well as the associated interface of the two, through the logging interpretation curve, such as figure 1 shown;

[0050] (2) Through the coaxial cable, the microwave generated on the ground is transmitted to the underground;

[0051] (3) Aim the antenna of the microwave at the first layer of the coal seam in the middle layer, turn on the microwave source, and carry out radiation heating to the oil shale;

[0052] Specifically, the power of the microwave emission source is set to 400W, and the electric field strength can reach a maximum value of 2310V / m;

[0053] Using continuous heating for 30 days, the maximum temperature of the coal seam is 489°C, the maximum temperature of the oil shale layer 1 is 169°C, and the maximum temperature of the oil shale layer 3 is 164°C. Line cloud chart see image 3 ;

[0054] from Figure 4 It can be seen that if the microwave is naturally aimed at the coal seam, alt...

Embodiment 3

[0056] (1) Judging the burial depth of interbedded oil shale and coal, as well as the associated interface of the two, through the logging interpretation curve, such as figure 1 shown;

[0057] (2) Through the coaxial cable, the microwave generated on the ground is transmitted to the underground;

[0058] (3) see figure 2 , aim the microwave antenna at the oil shale layer 2 in the middle layer (because the oil shale pyrolysis temperature is higher than the low temperature pyrolysis temperature of the coal seam, the high temperature area of ​​the oil shale can be used to heat the nearby coal seam Solution), turn on the microwave source, and carry out radiation heating to the oil shale;

[0059] Specifically, the power of the microwave emission source is set to 600W, and the electric field strength can reach a maximum value of 2830V / m;

[0060] (4) Heat the oil shale to the pyrolysis temperature, monitor the temperature of the oil shale near the wellbore with a downhole temp...

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Abstract

The invention discloses a method for synergistic in-situ mining of oil shale and coal interbeds. Based on the geological characteristics associated with oil shale and coal interbeds, microwave heating is used to co-heat oil shale and coal in situ, so that Oil shale and coal are co-pyrolyzed and transformed into liquid and gaseous organic matter, which then flow into the wellbore through pores and fracture channels and are produced by production wells. The present invention uses the in-situ pyrolysis method of microwave heating, transforms mechanical physical mining into electromagnetic chemical pyrolysis mining, changes physical coal mining into chemical gas extraction, reduces unnecessary heat energy consumption, and improves oil shale and oil shale. The pyrolysis efficiency of coal increases the quality grade of pyrolysis products and reduces the pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of oil shale mining, in particular to a method for synergistic in-situ mining of oil shale and coal interbeds. Background technique [0002] Oil shale is a kind of unconventional oil and gas resources. It needs to convert organic matter by heating to obtain high-quality fuels such as shale oil and pyrolysis gas. my country is extremely rich in oil shale resources, some of which are associated with coal resources, that is, in the form of oil shale and coal interbeds or in the form of oil shale roofs. This part of oil shale resources is mainly associated with coal mechanical mining Minerals are extracted to the ground for refining. This method not only wastes resources, but also pollutes the ecological environment, which is not conducive to the realization of my country's carbon neutral goal. [0003] Existing mining methods for oil shale and coal mainly include mechanical excavation and underground mining. Am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/295E21B47/07E21B43/34
CPCE21B43/2401E21B43/295E21B43/34
Inventor 朱静怡杨兆中李小刚王浩易良平
Owner SOUTHWEST PETROLEUM UNIV
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