CN105003296A - Method for treating low air permeability coal seam gas discharge - Google Patents
Method for treating low air permeability coal seam gas discharge Download PDFInfo
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- CN105003296A CN105003296A CN201510486291.4A CN201510486291A CN105003296A CN 105003296 A CN105003296 A CN 105003296A CN 201510486291 A CN201510486291 A CN 201510486291A CN 105003296 A CN105003296 A CN 105003296A
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Abstract
The invention discloses a method for treating low air permeability coal seam gas discharge. According to the method, holes are bored in a coal seam of a coal face, and coal seam fracturing is carried out through a borehole expansion agent to increase the coal seam air permeability for gas discharge. The method comprises the following steps: firstly, forming the boreholes in the coal seam according to the degree of freedom and the hardness of the coal seam; secondly, preparing the borehole expansion agent according to different coal seam temperatures and the characteristics of the borehole expansion agent; thirdly, purging residual coal slag and water in the boreholes in the coal seam to be clean through high-pressure air, and pressing the expansion agent into the boreholes through an extrusion pump or a grout pump to break the coal seam after the reaction of the expansion agent; finally, fracturing the coal seam through the explosion agent to increase the coal seam air permeability, thereby reducing the gas concentration.
Description
Technical field
The present invention relates to a kind of drawing-off gas technology, particularly relate to a kind of method processing low air permeability coal seam drawing-off gas.
Background technology
Coal and gas prominent is one of major reason causing coal production process accident.Along with the extension of coal mining level, geostatic stress increases, and gas pressure raises, and causes regional area methane accumulation, and coal and gas prominent danger is also more and more serious, and gas preventing and control difficulty is also increasing.Gas is taken out, arrange one of technical measures that (gas pumping and drawing-off gas) is control gas, but for low air permeability coal seam, gas is taken out, it is poor to arrange effect, does not reach the object of gas control.The conventional anti-reflection technology of gas mainly contains now: waterpower joint-cutting enhanced gas extraction technology, Deep-hole Controlled Blasting technology, rotation waterpower counter-boring techniques, intensive long drilled holes technology etc., but the problem that these exist, and engineering quantity is large, the activity duration long, measure effect inspection exceeding standard rate is high, and often bring potential safety hazard in coal-face operation, damage equipment, easily bring out the outstanding of coal and non-coal, cause major disaster accident, also some safety measures must be increased for avoiding these hidden danger, add supply and demand and cost, affect production efficiency.
Summary of the invention
The object of this invention is to provide a kind of method processing low air permeability coal seam drawing-off gas, the gas gathered in the discharge coal seam that the method can be effective, safe.
The present invention is achieved by the following technical solutions:
The method of drawing-off gas in coal seam of the present invention, comprises and holing to the coal seam in coal-face, uses drilling expanding agent to carry out coal bed fracturing, increases gas permeability of coal seam, firedamp drainage.
Described drilling expanding agent is to the step of coal bed fracturing drawing-off gas:
A, drilling stage: according to degree of freedom and the hardness in coal seam, boring is arranged in coal seam, and described boring aperture is 25 ~ 100mm, and hole depth is 0.8 ~ 10m, and the spacing between boring is 0.2 ~ 1.5m;
B, preparation stage: when selecting drilling expanding agent, characteristic requirements according to different coal seam temperature and drilling expanding agent carries out proportioning, the water/binder ratio of preparation expansion agent is 0.2 ~ 0.35, gradient according to boring carries out proportioning, or first for drilling expanding agent paper using is packaged into cylindric, insert boring after immersion;
C, filling perforation stage: should to ensure in drilling hole before filling expansion agent and hole other clean, the remaining cinder in coal bed drilling and water applying high voltage air blowing clean.Use extruding or grout pump by expansion agent press-in hole, and block up rapidly with sealing material, after drilling expanding agent reaction, coal seam is broken;
D, discharge phase: drilling expanding agent is by after coal bed fracturing, and gas permeability of coal seam increases, thus gas density is reduced.
As seen from the above technical solution provided by the invention, the method of coal-bed gas discharge of the present invention, owing to using drilling expanding agent, static pressure break is carried out to coal seam, there is safety high, easy to operate, the feature that cost is low, can not shake in expansion process, noise, dust and toxic gas.Be applicable to the drawing-off gas in various colliery, be particularly useful for the process of the drawing-off gas of low permeability mine.
Accompanying drawing explanation
Fig. 1 is that of the present invention boring in working face of coal seam arranges schematic diagram;
Fig. 2 is the Technology Roadmap of gas drainage under suction of the present invention.
Detailed description of the invention
In coal seam of the present invention, the detailed description of the invention of the method for drawing-off gas is, comprises and holing to the coal seam in coal-face, uses drilling expanding agent to carry out coal bed fracturing, increases gas permeability of coal seam, firedamp drainage.
When static pressure break being carried out to rock stratum with drilling expanding agent, first according to the scope of freedom and the hardness in coal seam, coal seam is arranged broken hole;
Then select drilling expanding agent, and prepare according to the characteristic requirements of drilling expanding agent;
Afterwards the drilling expanding agent prepared is poured into boring, after drilling expanding agent reaction, coal seam is broken.
After coal seam is broken, gas can be discharged by free diffusing or negative pressure equipment.
Specifically when arranging that expansion is bored, preferably follow following principle:
When constructing, high, the broken bore dia of environment temperature is large, water/binder ratio is little, pitch-row hour for general drilling expanding agent, and cracking time is fast, effect is large; Otherwise cracking time is slow, effect is little.Therefore, pitch-row and the aperture in cloth hole will be considered according to field condition and construction cost etc.
Concrete enforcement, as shown in Figure 1, horizontal expansion boring and bleeder off hole are arranged perpendicular to work plane in coal seam, and one or more powder charge hole, interval just retains an emptying aperture and does not fill static breaking agent, does not fill the emptying aperture of static breaking agent so just as pilot hole or the scope of freedom.The method of this powder charge can adopt the mode that inwardly order is broken from both sides, coal seam, also can adopt the mode of primary fragmentation.
During boring, the boring of periphery should be suitably intensive compared with the hole at middle part, to guarantee that periphery medium is first broken.
Bore diameter can scope between 25 ~ 100mm.Undertaken preferably by coal seam actual conditions, boring is preferably less than 65mm, easily punching occurs, must cover after pouring into static breaking agent more than during 65mm.The optimum aperture of expansion drilling hole is 35 ~ 45mm.
The hole depth of expansion boring is preferably between 0.8 ~ 10m, and carrying out preferred chi optimum according to coal seam thickness and methane accumulation degree etc. is 2 ~ 8m.
The spacing expanded between boring is preferably 0.2 ~ 1.5m, and according to seam hardness preferred size, optimal size is 0.4 ~ 1m, while layout expands boring, arrange emptying aperture (bleeder off hole), thus release gas.
When selecting drilling expanding agent, according to different seasons and temperature, applicable static breaking agent to be selected; When preparing expansion agent, the gradient according to broken hole selects proportioning: the water/binder ratio of preparation expansion agent is generally 0.2 ~ 0.35.Should to ensure in drilling hole before filling expansion agent and hole other clean, the remaining cinder in coal bed drilling and water applying high voltage air blowing clean.Use extruding or grout pump by expansion agent press-in hole, also can first for static breaking agent paper using is packaged into cylindric, after immersion, insert broken hole, aperture can be pricked above paper and be beneficial to soak, and block up rapidly with sealing material.
According to the principle of drilling expanding agent, first coal seam can be tested targetedly in Practical Project, experimentally result adjustment construction parameter.
Should also be noted that in construction:
Drilling expanding agent belongs to alkaline, and have mild corrosion to skin, operating personnel Wear goggles and emgloves, fills boring until crackle please don't be looked at straight facing to aperture before occurring, in case sporadic punching phenomenon injury eyes; Slurry after stirring should in 5 minutes filling perforation complete; Find in stirring that slurry heats up rapidly and scalds one's hand to become dry, slurry should be poured on that underground gives up need not; The static breaking agent of different model can not be used with, forbids to blend other chemicals; Strict protection against the tide, should be finished after unpacking as far as possible.
It is high that the present invention has safety, easy to operate, the feature that cost is low, can not shake, noise, dust and toxic gas in expansion process.Be applicable to the drawing-off gas in various colliery, be particularly useful for the process of the drawing-off gas of low permeability mine.The bulbs of pressure are large, maximumly reach 100MPa.Be applicable to the fragmentation in various coal seam.
Expansion agent belongs to the expanded gel material of cement class, with water generation hydration reaction, form the crystallization of solid volume multiplication, thus compression pressure is produced to coal bed drilling, when the tension stress of compressive stress, vertical direction has exceeded the tensile strength of coal body, broken body generation has just been made to chap.
Expansion agent is a kind of Novel crushing construction technology that development in recent years is got up, because it can in friction, without slungshot, broken or cutting rock stratum or concrete structures under noiselessness, free of contamination condition, pole is suitable for the reorganization and expansion of the removal of all kinds of reinforced concrete foundation, building in urban construction and bridge, harbour, road, culvert.Thus have vast potential for future development, static crushing technology is successfully applied on ground, but does not also have the precedent of application in coal-bed gas discharge.Drilling expanding agent is applied in the safety in production in colliery by the present invention just.
The above; be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in technical scope of the present invention; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (9)
1. process a method for low air permeability coal seam drawing-off gas, it is characterized in that, comprise the steps:
A, coal bed drilling stage: according to degree of freedom and the hardness in coal seam, boring is arranged in coal seam, is holed in the coal seam in coal-face;
In the preparation stage of b, drilling expanding agent: select drilling expanding agent, the characteristic requirements according to different coal seam temperature and drilling expanding agent carries out proportioning;
C, filling perforation stage: use extruding or grout pump by expansion agent press-in boring, after drilling expanding agent reaction, static pressure break is carried out in coal seam;
D, discharge phase: drilling expanding agent is by after coal bed fracturing, and gas permeability of coal seam increases, firedamp drainage, thus gas density is reduced.
2. the method for process low air permeability coal seam drawing-off gas according to claim 1, it is characterized in that, in the described coal bed drilling stage, horizontal expansion boring and bleeder off hole are arranged perpendicular to work plane in coal seam, one or more powder charge hole, interval just retains an emptying aperture and does not fill drilling expanding agent, does not fill the emptying aperture of drilling expanding agent as pilot hole or the scope of freedom.
3. the method for process low air permeability coal seam drawing-off gas according to claim 1 and 2, is characterized in that, described boring aperture is 25 ~ 100mm.
4. the method for process low air permeability coal seam drawing-off gas according to claim 1 and 2, is characterized in that, the hole depth of described boring is 0.8 ~ 10m.
5. the method for process low air permeability coal seam drawing-off gas according to claim 1 and 2, is characterized in that, the spacing between described boring is 0.2 ~ 1.5m.
6. according to the method for process low air permeability coal seam drawing-off gas according to claim 1, it is characterized in that, in the preparation stage of described drilling expanding agent, when selecting drilling expanding agent, according to the temperature of different seasons and rock stratum, select suitable drilling expanding agent;
When drilling expanding agent is prepared, select the denseness of proportioning according to the gradient of drilling hole:
The water/binder ratio of preparation expansion agent is 0.2 ~ 0.35, should to ensure in drilling hole before filling expansion agent and hole other clean, the remaining cinder in coal bed drilling and water applying high voltage air blowing clean.
7. the method for process low air permeability coal seam drawing-off gas according to claim 6, it is characterized in that, use extruding or grout pump by expansion agent press-in hole, or first for static breaking agent paper using is packaged into cylindric, broken hole is inserted after immersion, prick aperture above paper to be beneficial to soak, and block up rapidly with sealing material.
8. according to the method for process low air permeability coal seam drawing-off gas according to claim 2, it is characterized in that, in the described filling perforation stage, the drilling expanding agent slurry prepared need pour into drilling hole before reaction is expanded.
9. according to the method for process low air permeability coal seam drawing-off gas according to claim 8, it is characterized in that, in described discharge phase, drawing-off gas employing is freely discharged or the mode of suction type extraction is discharged.
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Cited By (9)
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| CN105507872A (en) * | 2015-12-31 | 2016-04-20 | 河南理工大学 | Hydraulic flushing and presplit blasting combined permeability-increasing extraction system in crossing holes |
| CN105840164A (en) * | 2016-03-18 | 2016-08-10 | 河南理工大学 | Regional pressure release coal bed gas mining method |
| CN105840165A (en) * | 2016-03-18 | 2016-08-10 | 河南理工大学 | High gas coal seam large height mining face gas control method |
| CN106089174A (en) * | 2016-06-30 | 2016-11-09 | 太原理工大学 | The method in hydrofracturing chemically expansible agent filling speedy drivage tunnel |
| CN107023284A (en) * | 2017-06-05 | 2017-08-08 | 贵州大学 | A kind of static expanding agent injected system and method for implanting |
| CN107035344A (en) * | 2017-06-05 | 2017-08-11 | 贵州大学 | A kind of coal bed gas pumping method of low permeability outburst coal seam |
| CN107152305A (en) * | 2017-07-25 | 2017-09-12 | 湖南科技大学 | A kind of method of coal seam pre-mining drainage gas |
| CN110821550A (en) * | 2019-10-09 | 2020-02-21 | 山西潞安环保能源开发股份有限公司 | Coal roadway gas drainage method |
| CN113122665A (en) * | 2021-04-16 | 2021-07-16 | 广东韶钢松山股份有限公司 | Method for treating dead iron layer of hearth after blast furnace shutdown |
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| CN105507872B (en) * | 2015-12-31 | 2017-11-17 | 河南理工大学 | Hydraulic flushing in hole combines anti-reflection extraction system with presplit blasting in layer-through drilling |
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| CN105840165A (en) * | 2016-03-18 | 2016-08-10 | 河南理工大学 | High gas coal seam large height mining face gas control method |
| CN105840165B (en) * | 2016-03-18 | 2018-07-10 | 河南理工大学 | A kind of high gas layer large-mining-height working surface mash gas harnessing method |
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| CN106089174B (en) * | 2016-06-30 | 2019-05-14 | 太原理工大学 | The method in hydrofracturing chemically expansible agent filling speedy drivage tunnel |
| CN107035344A (en) * | 2017-06-05 | 2017-08-11 | 贵州大学 | A kind of coal bed gas pumping method of low permeability outburst coal seam |
| CN107023284A (en) * | 2017-06-05 | 2017-08-08 | 贵州大学 | A kind of static expanding agent injected system and method for implanting |
| CN107152305A (en) * | 2017-07-25 | 2017-09-12 | 湖南科技大学 | A kind of method of coal seam pre-mining drainage gas |
| CN110821550A (en) * | 2019-10-09 | 2020-02-21 | 山西潞安环保能源开发股份有限公司 | Coal roadway gas drainage method |
| CN113122665A (en) * | 2021-04-16 | 2021-07-16 | 广东韶钢松山股份有限公司 | Method for treating dead iron layer of hearth after blast furnace shutdown |
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Application publication date: 20151028 |