CN103114871A - Extraction device and method utilizing microwave coal heating layer - Google Patents
Extraction device and method utilizing microwave coal heating layer Download PDFInfo
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- CN103114871A CN103114871A CN201310066397XA CN201310066397A CN103114871A CN 103114871 A CN103114871 A CN 103114871A CN 201310066397X A CN201310066397X A CN 201310066397XA CN 201310066397 A CN201310066397 A CN 201310066397A CN 103114871 A CN103114871 A CN 103114871A
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Abstract
Disclosed are extraction device and method utilizing a microwave coal heating layer. The extraction device mainly comprises an extraction and drainage pipe (1), a helical antenna (7), a front-loaded cover (6), a cable (8), a microwave generator (9), a controller (10), a cooling device (11), a gas exhaust pipe (12) and the like. The problems of low extraction rate and extraction speed of existing extraction methods are solved. The extraction method is characterized by including: firstly drilling a hole at an appointed position of an extraction coal layer, paving an anchorage net on the surface of the extraction coal layer and drilling a drill rod to reinforce the coal layer; placing the extraction and drainage pipe with the helical antenna into the drilled hole by the distance 0.6-1.0m away from the coal layer, sealing the hole by high-temperature-resistant cement grouting, and starting the microwave generator to heat the extraction coal layer to the temperature of 80-200 DEG C. After the coal layer is heated, desorption speed of gas is increased, the free gas is increased to cause increase of gas volume of the coal layer, so gas pressure is increased and gas extraction rate of gas of the coal layer in the negative-pressure extraction drilled hole is increased favorably.
Description
Technical field
The present invention relates to a kind of drainage device that utilizes microwave technology heating coal seam, belong to coal bed gas extraction technical field, be suitable for high gas lower permeability seam and draw out methane.
Background technology
The most of colliery of China is all highly gassy mine, and coal and Gas Outburst, the Disasters such as gas explosion are natural calamities serious in coal mining, progressively increasing along with the pit mining degree of depth and scale, coal seam gas-bearing capacity increases gradually, and Gas Disaster is also more serious, not only affects the safety of coal mines High-efficient Production, and threaten mine personnel safety, have a strong impact on China's coal-mine safety in production and economic sustainable and stable development.
Highly gassy mine all will carry out gas pumping to the coal seam before exploiting at present, main pumping method has ground drilling to implement gas drainage under suction, the gas drainage under suction of this coal bed drilling closes on heading boring associating extraction, the methods such as adjacent coal seam layer-through drilling extraction.Its basic principle is that the negative pressure extraction is carried out in boring in the coal seam, and the gas that the boring ambient pressure is high is mobile to the low-pressure area of boring.But because the most of coal seam of China belongs to low permeability coal seam, cause this negative pressure extraction not reach desirable effect to low permeability coal seam, and the extraction time is longer, affects the safe and efficient production in colliery.
Temperature has obvious impact to the coal-bed gas adsorption capacity, and temperature is higher, and coal adsorption gas amount is less.Determine that with following empirical formula temperature is on the impact of gas adsorption amount:
X
t＝X
0e
-nt
[0005] X in formula
t, X
0The adsorption gas amount of coal when-temperature is respectively t ℃ and 0 ℃, m
3/ t
The temperature of t-coal, ℃; The constant that n-is relevant with gas pressure; N=0.02/ (0.993+0.07P); The P-gas pressure, MP.
Microwave refers to the uhf electromagnetic wave of frequency between 0.3～300GHz, and since nineteen fifty found that for the first time microwave can be used for to the material heating, microwave heating effect research was rapidly developed, and is widely used in industrial circle and resident living.Microwave has that firing rate is fast, efficient is high, intensification easy to operate, untouchable, object is not to transmit by heat but the advantage such as complete by outfield and object interaction.
Therefore utilize the heating using microwave coal seam to be conducive to the parsing of gas in the coal seam, reduce the time of Gas Drainage from Virgin Coal Seams, improve the effect of gas drainage under suction.
Summary of the invention
The object of the invention is to effectively to solve the difficult problem in high gas lower permeability seam gas pumping process, a kind of method of utilizing the heating using microwave gas drainage from coal seam is provided, the method can improve the penetrating power in coal seam, strengthen the ability that gas is resolved in the coal seam, accelerate the extraction speed of gas and improve the extraction rate.
The technical solution adopted in the present invention is as follows:
On the basis of original extraction system, the front end of each extraction borehole is installed the microwave antenna of a spiral, and the spacing of extraction borehole is decided according to the scope that helical antenna can cover, and is the diametral distance of antenna institute coverage.After the extraction system debug is complete, start microwave generator, give each extraction borehole heating, the coal seam is heated to 80 ℃-200 ℃, down-hole coal bed more micro-crack or the microfissure of at high temperature producing, adsorption gas is free gas with rapid desorb, increasing of free gas causes the change of coal-bed gas volume large, then gas pressure increases, and is conducive to flowing of coal-bed gas, improves the extraction speed of gas under the effect of negative pressure extraction boring.
The described drainage device that utilizes the heating using microwave coal seam, applicable equally for the extraction in the unconventional natural gas such as dark basin gas, shale gas field.
Concrete steps of the present invention are:
1. carry out anchor net and bolt anchorage to the coal seam drilling that carries out gas pumping, and to the coal seam, prevent excessive coal and the gas burst accident of causing of coal-bed gas pressure in heating process.
2. will put into boring with the releasing pipe of helical antenna, and make the helical antenna of releasing pipe front end be about 0.6-1.0m apart from coal seam length.
3. adopt the high temperature resistant cement grouting filling between above-mentioned releasing pipe and boring.
4. will be connected with microwave generator with the releasing pipe of helical antenna, and start the uhf electromagnetic wave that microwave generator produces 915MHz, through cable, distribute to each helical antenna by controller, the coal seam temperature is controlled in 80 ℃-200 ℃.
5. open negative pressure on ground extraction system, to the heating coal seam carrying out extraction.
The heating using microwave gas drainage from coal seam method of utilizing of the present invention can improve coal-bed gas pressure, increases gas flow speed, increases coal seam permeability, accelerates the desorption rate of coal-bed gas, thus can be more efficiently mash gas extraction fast.
Description of drawings
Fig. 1 is coal seam surface drilling arrangement diagram.
Fig. 2 is the structural representation that the present invention utilizes heating using microwave coal seam device.
Fig. 3 is the method flow diagram that utilizes the heating using microwave coal seam of the present invention.
In figure: 1-releasing pipe, the slip casting of 2-high temperature resistant cement, 3-anchor net, 4-anchor pole, 5-extraction coal seam, the preposition cover of 6-, 7-helical antenna, 8-cable, 9-microwave generator, 10-controller, 11-heat sink, 12-gas-removing pipeline.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail:
As shown in Figure 1, utilize the drainage device in heating using microwave coal seam mainly to be formed by releasing pipe, helical antenna, preposition cover, cable, microwave generator, controller, heat sink, drawing-off gas pipe in the present invention, wherein: the length of helical antenna is for adopting 1/4 left and right of microwave wavelength, the frequency of microwave generator is 915MHz, and preposition cover outer wall is the filter screen with gas permeability.
At first select by extraction coal seam (5), play extraction boring to the position of appointment, the interval between adjacent boring is equal to or slightly greater than the diameter that penetrates of helical antenna, and to the drilling coal seam carrying out anchor net (3) and anchor pole (4) consolidation process.
The releasing pipe (1) that helical antenna is housed is put into boring, make the preposition cover (6) of releasing pipe front end be about 0.6-1.0m apart from coal seam length.
Adopt high temperature resistant cement slip casting (2) that the hole between releasing pipe and boring is filled up.
To be connected with microwave generator (9) with the releasing pipe (1) of helical antenna, and the startup microwave generator produces the uhf electromagnetic wave of 915MHz, through cable (8), and distribute to each helical antenna (7), the coal seam temperature is heated in 80 ℃-200 ℃.Open simultaneously negative pressure on ground extraction system, to the heating coal seam carrying out extraction.
The heating using microwave gas drainage from coal seam method of utilizing of the present invention, can be fast and effectively the extraction coal seam be heated in 80 ℃-200 ℃, can effectively improve coal-bed gas pressure, increase gas flow speed, produce more micro-crack or microfissure in the coal seam, increase coal seam permeability, accelerate the desorption rate of coal-bed gas, thereby reach the efficient extraction purpose in high gas hypotonicity coal seam.
Claims (4)
1. drainage device and method of utilizing the heating using microwave coal seam, comprising: it comprises releasing pipe (1), helical antenna (7), preposition cover (6), cable (8), microwave generator (9), controller (10), heat sink (11), drawing-off gas pipe (12) etc.It is characterized in that: select extraction coal seam (5) to assigned address drilling (1), and spread anchor net (3) on surface, extraction coal seam and beat anchor pole (4) and reinforce the coal seam, putting into boring with the releasing pipe of helical antenna (7), the about 0.6-1.0m apart from coal seam, the place ahead, carry out sealing of hole with high temperature resistant cement slip casting (2), open microwave generator (9) heating extraction coal seam to 800C-2000C.
2. the pumping method that utilizes the heating using microwave coal seam as device as described in above-mentioned claim, is characterized in that comprising the steps:
A. carry out anchor net (3) and anchor pole (4) reinforcing to the coal seam of carrying out gas pumping (5) drilling, and to the coal seam, prevent excessive coal and the gas burst accident of causing of coal-bed gas pressure in heating process.
B. will put into boring with the releasing pipe (1) of helical antenna (7), and allow the helical antenna of releasing pipe (1) front end be about 0.6-1.0m apart from coal seam length.
C. adopt high temperature resistant cement slip casting (2) filling between above-mentioned releasing pipe (1) and boring.
D. will be connected with microwave generator (9) with the releasing pipe (1) of helical antenna, and the startup microwave generator produces the uhf electromagnetic wave of 915MHz, through cable (8), distribute to each helical antenna (7) by controller (10), the coal seam temperature is controlled in 800C-2000C.
E. open negative pressure on ground extraction system, to the heating coal seam carrying out extraction.
3. the heating using microwave drainage from coal seam device that utilizes according to claim 1 is characterized in that the frequency of the microwave generator (9) that adopts is 915MHz.
4. the heating using microwave drainage from coal seam device and method that utilizes according to claim 1 is characterized in that: the device that utilizes this heating using microwave coal seam is applicable equally for the extraction in the unconventional natural gas such as dark basin gas, shale gas field.
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Application publication date: 20130522 |