CN104727802B - Subterranean coal penetrates method - Google Patents

Subterranean coal penetrates method Download PDF

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Publication number
CN104727802B
CN104727802B CN201510035352.5A CN201510035352A CN104727802B CN 104727802 B CN104727802 B CN 104727802B CN 201510035352 A CN201510035352 A CN 201510035352A CN 104727802 B CN104727802 B CN 104727802B
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pressure
ascending pipe
passage
coal
aperture
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CN104727802A (en
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刘清宇
刘刚
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ENN Science and Technology Development Co Ltd
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ENN Science and Technology Development Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295Gasification of minerals, e.g. for producing mixtures of combustible gases

Abstract

The present invention relates to a kind of subterranean coal to penetrate method, coal seam insertion during for by underground coal gasification(UCG) between prefabricated passage and burned out area, the passage is extended in subterranean coal by the directional hole on ground and formed, and the end of the passage is close to the burned out area, ascending pipe is set in the directional hole, gas is nearby injected to the end of the passage by the ascending pipe.Gasifying agent of the present invention directly acts on section coal seam to be penetrated, and so as to reduce cutting through time, shortens and builds the stove cycle, has reached fast run-up stove, the quick effect up to production.

Description

Subterranean coal penetrates method
Technical field
The present invention relates to a kind of gasifying underground coal technical field, refers in particular to underground coal insertion method.
Background technology
Gasifying underground coal technology be primarily referred to as coal, coke either the solid fuel such as semicoke high-temperature pressure or pressurization bar Reacted under part with gasifying agent, be converted into the process of gaseous product and a small amount of residue.The gasifying agent is mainly vapor, sky Oxygen-enriched or their gaseous mixture of gas, various concentrations.Coal gasification processes produce fuel gas, as industrial kiln gas or Person's town gas, it can also be used to gaseous mixture is manufactured, as synthesis ammonia, the raw material of synthesizing methanol and synthetic liquid fuel, therefore coal Charcoal gasification technology is one of important technology of coal chemical industry.
In order to reach large-scale production, prefabricated gasification tunnel structure gasification furnace in advance is needed before underground coal gasification(UCG), in coal seam In gasification, the foundation of the passage usually requires to utilize drilling tool, in the drilling fluid and passage required in work progress Coal seam water can leak out to the burned out area, this phenomenon is referred to as leakage.A large amount of leakages are unfavorable to be run with gasification.Constructed in drilling tool Later stage, the coal seam between the passage and the burned out area easily cave in, and cause drilling tool not work on.Because of construction technology water The passage that flat limitation can not establish machinery is that flame range is connected completely and with the region of burned out area adjoining, while in view of structure gas Generally there is leakage in passage construction and showed to adverse effect caused by gasification in water and drilling fluid when changing stove in coal seam As when have a drilling fluid seepage when stop construction, so as to cause quilt between the passage where the passage and burned out area that machinery establishes One section of coal seam barrier.First have to that this section of coal bed fracturing is produced into passage by gases at high pressure during coal seam gasification, so that Gasification production is carried out again after two passage insertions.
The existing insertion mode to passage is to input gasifying agent by aperture, and the method for improving constantly admission pressure carrys out pressure break Coal seam, after crack occurs in coal seam, gas is connected two passages by crack;Because gas by crack enters fire Area, so as to cause to be formed about inversely igniting in flame range, passage is made completely through finally making two channel pressures by heat effect Reach balance.Although the above method realizes the insertion of subterranean coal, but cutting through time is grown, and leak rate is higher, main cause Have at following 2 points:(1) after drilling completion, the passage that the presence of coal seam water and drilling fluid makes largely to build is full of water, existing logical Cross aperture to pressurize, the water in passage drains the rear gasifying agent and gets to the position to be penetrated under pressure, and passage is got over Long, water discharge time is longer, causes cutting through time to extend;(2) when aperture is pressurizeed, during Pressure water discharging, the water meeting in coal seam To burned out area seepage, the coal seam for draining water, because gasifying agent directly transmits in passage, therefore it is easy to leakage to coal seam In, so as to extend cutting through time.
The content of the invention
Therefore, the technical problems to be solved by the invention are to overcome the time length for penetrating coal seam needs in the prior art, And gasifying agent is easy to the problem of leakage is in coal seam and can directly acted on and coal seam to be penetrated so as to provide a kind of not only gasifying agent And the subterranean coal insertion method that cutting through time is shorter.
In order to solve the above technical problems, a kind of subterranean coal insertion method of the present invention, for by coal underground gas Coal seam insertion during change between prefabricated passage and burned out area, the passage extend shape by the directional hole on ground in subterranean coal Into, and the end of the passage the described method comprises the following steps close to the burned out area:Step S1:In the directional hole Ascending pipe is set, the end of the passage nearby slowly pressurizeed by injecting gas into the ascending pipe;Step S2: The amount of pressurization of the ascending pipe is improved, observes the pressure change at the ascending pipe, if pressure is begun to decline, shows the injection Gas in pipe is to coal seam seepage to be penetrated;Step S3:Increase the air inflow of the ascending pipe to maintain the ascending pipe Amount of pressurization;The change value of pressure at the aperture of the directional hole is observed, the pressure value at aperture levels off to the burned out area During pressure value, insertion is completed.
In one embodiment of the invention, the regulation directional hole is additionally provided between the step S1 and the step S2 Aperture at pressure the step of being zero.
In one embodiment of the invention, the step of pressure is zero at the aperture of the regulation directional hole is as follows:Sealing The aperture of the directional hole, the pressure in the aperture is slowly reduced until aperture by being arranged on the exhaust stack below sealing station The pressure at place is zero.
In one embodiment of the invention, when having water discharge ground in the exhaust stack, the pressure in the aperture is zero.
In one embodiment of the invention, in the step S2, increased by improving the amount of pressurization of the ascending pipe It is passed through the air inflow of channel end.
In one embodiment of the invention, after the amount of pressurization of the ascending pipe improves, the passage and the burned out area Between coal seam to be penetrated formed gap so that the gas in the ascending pipe causes the note to coal seam seepage to be penetrated The pressure for entering pipe is begun to decline.
In one embodiment of the invention, the maximum pressure of the ascending pipe amount of pressurization should be less than roof and be born Pressure.
In one embodiment of the invention, in the step S3, in order to maintain the amount of pressurization of the ascending pipe, the note Entering the air inflow of pipe gradually increases, and after air inflow is increased to setting value, keeps the air inflow constant, observes the directional hole Change value of pressure at aperture.
In one embodiment of the invention, the end of the ascending pipe is near the end of the passage.
In one embodiment of the invention, the horizontal segment of the passage is provided with supporting tubing.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art:
Gasifying agent of the present invention directly acts on section coal seam to be penetrated, and so as to reduce cutting through time, shortens and builds stove In the cycle, fast run-up stove, the quick effect up to production are reached.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, specific embodiment and combination below according to the present invention Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the structural representation of subterranean coal of the present invention;
Fig. 2 is the relevant device schematic diagram that the present invention uses on the ground.
Embodiment
As depicted in figs. 1 and 2, the invention provides a kind of subterranean coal to penetrate method, during for by underground coal gasification(UCG) Coal seam insertion between prefabricated passage 11 and burned out area 12, the passage 11 is by the directional hole 11A on ground in subterranean coal 10 extensions are formed, and the horizontal segment of the passage 11 is located near the seat earth 10A, and the end 11B of the passage 11 is leaned on The nearly burned out area 12, the described method comprises the following steps:Step S1:Ascending pipe 13 is set in the directional hole 11A, passed through Gas is injected into the ascending pipe 13 nearby slowly to pressurize to the end 11B of the passage 11;Step S2:Described in raising The amount of pressurization of ascending pipe 13, the pressure change at the ascending pipe 13 is observed, if pressure is begun to decline, show the ascending pipe 13 Interior gas is to coal seam seepage to be penetrated;Step S3:Increase the air inflow of the ascending pipe 13 to maintain the ascending pipe 13 Amount of pressurization;Observe the change value of pressure at the aperture of the directional hole 11A, it is empty that the pressure value at aperture levels off to the combustion During the pressure value in area 12, insertion is completed.
Subterranean coal of the present invention penetrates method, prefabricated passage 11 and burned out area during for by underground coal gasification(UCG) Coal seam insertion between 12, the lower section of the burned out area 12 is lime-ash 16, and the passage 11 is by the directional hole 11A on ground on ground Lower coal seam extends to be formed, and the horizontal segment of the passage 11 is located near the seat earth 10A, and the end of the passage 11 11B sets ascending pipe 13 in the directional hole 11A, passes through the ascending pipe in the burned out area 12, the step S1 The 13 end 11B slowly pressurizations nearby to the passage 11, so that certain pressure value is produced in passage 11, due to passing through note When entering pipe 13 gas is injected from ground to coal seam, gas can be fed directly to coal seam to be penetrated, gas is avoided and passing The possibility of seepage during defeated, therefore the utilization rate of gas is improved, and reduce cutting through time;In the step S2, The amount of pressurization of the ascending pipe 13 is improved, with the continuous improvement of amount of pressurization in the ascending pipe 13, in the ascending pipe 13 Gas can cause the pressure at the ascending pipe 13 downward trend occur, pass through the step gradually to coal seam seepage to be penetrated S2 can speculate to obtain the amount of pressurization in the ascending pipe 13 so that the effectively save energy;In the step S3, in order to accelerate to lead to Coal seam insertion between road 11 and burned out area 12, because downward trend occurs in pressure in step S2, it is therefore desirable to described in increase The air inflow of ascending pipe 13 makes the gas in ascending pipe 13 endlessly to treating maintaining the amount of pressurization of the ascending pipe 13 Penetrate coal seam seepage, the pressure value at the aperture of the directional hole 11A level off to the burned out area 12 pressure value when, explanation Coal seam to be penetrated between the passage 11 and the burned out area 12 is got through completely, and insertion is completed.
In step S1 of the present invention, admission pressure is observed by the pressure gauge P1 set on ground on the ascending pipe 13 Change, and the pressure gauge P2 for the aperture setting for passing through the directional hole 11A observes aperture pressure change.Pass through the ascending pipe 13 To the passage 11 end 11B nearby slowly pressurization when, the pressure process by the 0.5MPa/2h frequencys progress, and control into Gas maximum pressure is in 2.5MPa between 3MPa.
Because coal seam is in gasification, also exist in the general longer and described passage 11 of the passage 11 a certain amount of Water, therefore the pressure value of the ascending pipe 13 is different with the end 11B of the passage 11 pressure value, in order to measure the end Pressure value at 11B, the pressure of the end 11B can be substantially reacted by pressure value at the aperture of the directional hole 11A, in order to Overcome itself the existing influence of air and a certain amount of water to the end 11B pressure of the passage 11 in the passage 11, Therefore the step of pressure is zero at the aperture for adjusting the directional hole 11A is additionally provided between the step S1 and the step S2. Specifically, the step of pressure is zero at the aperture of the regulation directional hole 11A is as follows:The aperture of the directional hole 11A is sealed, from And avoid the pressure in the passage 11 from being disturbed by external environment, pass through the exhaust stack 14 being arranged on below sealing station 11C The pressure in the aperture is slowly reduced until the pressure at aperture is zero.
In pressure method at the above-mentioned regulation directional hole aperture, slowly it is depressured by the exhaust stack 14 and repeatedly more It is secondary, keep rate of pressure reduction to make the mode of the air inlet of ascending pipe 13 ensure admission pressure in 2.5MPa to 3MPa in 0.1MPa/h Between, so as to realize the purpose for making aperture pressure be down to zero.When having water discharge ground in the exhaust stack 14, show the passage The air in water surface top to the directional hole 11A apertures in 11 is extracted, and now closes valve 17, the pressure drop in the aperture It is zero, when continuing construction, if the change can that pressure occurs again for the end 11B of passage 11 directly eliminates external environment Influence, so as to avoid influence of the external environment to channel end.
In step S2 of the present invention, due to making the end of the passage 11 by the pressurization of ascending pipe 13 in the step S1 End 11B already has certain pressure, the row for causing now described coal seam to be penetrated to be in itself bleeding stage or coal seam In the water stage, show as that pressure is high, flow is small the stage, can be by increasing in order to heighten the amount of pressurization of the ascending pipe 13 The amount of pressurization for stating ascending pipe 13 is realized.In order that air inflow reaches 500Nm3/ h, with 0.5Nm3/ 4h the frequency improves admission pressure, When air inlet is reached into 500Nm3/h by improving amount of pressurization, the pressure is maintained to run.If the amount of pressurization of the ascending pipe 13 is gradual After raising, the coal seam to be penetrated between the passage 11 and the burned out area 12 is set gradually to produce gap, this gap can be Crack or gap, the gas in the ascending pipe 13 is finally set, to coal seam seepage to be penetrated, to cause described by the gap The pressure of ascending pipe 13 starts progressively to decline.
It is to be noted that:The maximum pressure of the amount of pressurization of ascending pipe 13 should be less than the pressure that roof 10B is born Power, with pressure excessive the problem of roof 10B may be caused to cave in for preventing that roof 10B from bearing.If the ascending pipe When 13 amount of pressurization reaches highest, air inflow does not reach 500Nm3/ h, the pressure is maintained to run.When air inflow reaches 500Nm3/h Afterwards, after a period of time, pressure is begun to decline at the ascending pipe 13, illustrates that a small amount of gas has been enter into burned out area.
In order to further expand the gap in the coal seam to be penetrated, make the gas in the ascending pipe 13 can be with continuous action On the coal seam to be penetrated, it is necessary to maintain the amount of pressurization of the ascending pipe 13 in step S3 of the present invention, and in order to maintain The amount of pressurization of the ascending pipe 13, the air inflow of the ascending pipe 13 needs gradually increase, after air inflow is increased to setting value, Air inflow is not being improved, maintaining the operation of the air inflow, i.e., maintain the pressure to continue to run with by improving the method for air inflow, when Air inflow reaches 800Nm3/ h, air inflow is not being improved, keeping the air inflow constant, at the aperture for observing the directional hole 11A Change value of pressure, pressure at aperture is presented downward trend, and the pressure at aperture levels off to the pressure of the burned out area 12 During power, illustrate that the coal seam to be penetrated between the passage 11 and the burned out area 12 is got through completely, insertion is completed.
Illustrate how to realize the insertion of subterranean coal with reference to specific data:
Embodiment one:
The ascending pipe 13 is set in the directional hole 11A, the ascending pipe 13 is transferred to apart from the passage 11 End 11B 1m positions, pass through end 11B from the ascending pipe 13 to the passage 11 nearby slowly pressurization, slowly improve Air inlet pressure force value observes aperture pressure change to 2.0MPa;After pressure occurs in the aperture of the directional hole 11A, by described Water outlet at slow pressure release to aperture is diffused in aperture by exhaust stack 14, is then shut off being arranged on the valve 17 at the exhaust stack 14; The amount of pressurization of the ascending pipe 13 is improved, when air inflow reaches 300Nm3After/h, stop pressurization, observe at the ascending pipe 13 Pressure change, if pressure is less than 3.0MPa, show that the gas in the ascending pipe 13 starts to coal seam seepage to be penetrated.Increase The air inflow of the ascending pipe 13 makes admission pressure be maintained at 3.0MPa or so maintaining the amount of pressurization of the ascending pipe 13, By repeatedly improving air inflow, when air inflow reaches 600Nm3During/h, stop increase air inflow, keep the air inflow to be passed through It is logical, while observe the change value of pressure at the aperture of the directional hole 11A, when the air inlet pressure force value for measuring the ascending pipe 13 and When pressure value at the aperture of the directional hole 11A is down to 0.7MPa, illustrate that insertion is completed.
Embodiment two:
The ascending pipe 13 is set in the directional hole 11A, the ascending pipe 13 is transferred to apart from the passage 11 End 11B 0.5m positions, pass through end 11B from the ascending pipe 13 to the passage 11 nearby slowly pressurization, same to time control The valve 17 at the exhaust stack 14 is made, the admission pressure of the ascending pipe 13 is maintained in the range of 2.5MPa to 3.0MPa, So as to which the water in passage 11 is passed through into the discharge on the exhaust stack 14.There is no after water discharge in the exhaust stack 14, stop Only aperture air inlet, the amount of pressurization of the ascending pipe 13 is improved, the pressure change at the ascending pipe 13 is observed, if under pressure starts Drop, show gas in the ascending pipe 13 to coal seam seepage to be penetrated, now air inflow reaches 300Nm3/ h, then keep the institute The pressure at ascending pipe 13 is stated, improves the air inflow of the ascending pipe 13;Increase the air inflow of the ascending pipe 13 to maintain The amount of pressurization of the ascending pipe 13, if the air inflow is less than 300Nm3During/h, the pressure at the ascending pipe is improved so that will Flow is improved to 300Nm3/ h, in the case where keeping admission pressure constant, air inflow is improved to 650Nm3/ h, observation are described fixed Change value of pressure at hole 11A aperture, when aperture, pressure is down to below 0.7MPa, illustrates that insertion is completed.
No matter embodiment one or embodiment two, the end 11B of passage of the present invention penetrated between the burned out area 12 Coal seam section distance it is most short, so as to beneficial to coal seam insertion, make cutting through time most short.The ascending pipe is driven by ground machine Moved forward and backward, and the ascending pipe 13 can select the coiled tubing of technology maturation.
In order to ensure being smoothed out for insertion, avoid causing after the dehydration of coal seam coal seam 10 to be caving in passage 11 so as to The problem of blocking ascending pipe 13, the end of the ascending pipe 13 are arranged near the end 11B of the passage 11.Specifically Ground, the terminal location of the ascending pipe 13 and the end 11B of the passage 11 distance are about in 0.5m between 1.0m.
The burned out area is leaked out to by the coal seam water in drilling fluid and passage during coal seam gasification in order to overcome Leakage situation, before being placed on passage under the ascending pipe 13, first by the forward end seal of ascending pipe 13, so that not only Cause coal seam 10 to be caving the problem of blocking ascending pipe 13 after the dehydration of coal seam 10 can be prevented, while prevent the cinder of precipitation in passage 11 Block the ascending pipe 13., can be certain by being inputted into the ascending pipe 13 before after the forward end seal of ascending pipe 13 Pressure so as to abolish sealing.
The horizontal segment of the passage 11 is provided with supporting tubing 15, and the payment tubing 15 can select fiberglass supporting, institute State supporting tubing 15 and primarily serve and support action is played to the horizontal segment of the passage 11, so as to prevent that it is logical that the slump of coal seam 10 from blocking Road;There should be certain crushing resistance in view of step, the supporting tubing 15 such as passage insertion and reverse gasification described in the later stage simultaneously, And there is flammable characteristic under the high temperature conditions, it is typically chosen the glass reinforced plastic pipe with certain resistance to compression grade.In practice of construction, If the coalfield ature of coal that gasifies is harder, the horizontal segment of passage 11 can not transfer supporting tubing 15.
In the present invention, the passage 11 can shift to an earlier date is constructed according to plan, and passing through for the passage 11 is reached when measuring flame range Start to pressurize by the inventive method during logical position and penetrate;The passage 11 also can first construct vertical section and inclined hole segment section, work as fire Construct when area burns near it its horizontal segment part, can also be constructed after a period of time of gasifying according to actual conditions again.
Gas of the present invention refers to the gasifying agent commonly used during coal seam gasification, and the gasifying agent can select air Oxygen and other inert gases can be selected to be matched, oxygen concentration is between 21%-50%.It is described in the present embodiment two Gasifying agent selects 35% carbon dioxide oxygen-enriched.
To sum up, subterranean coal insertion method of the present invention has advantages below:
1. in the step S1 of the present invention, nearby slowly pressurizeed to the end of the passage by the ascending pipe, , can be by gas during due to injecting gas from ground to coal seam by ascending pipe so that produce certain pressure value in passage Coal seam to be penetrated is fed directly to, avoids the possibility of gas seepage in transmitting procedure, therefore improves making for gas With rate, and reduce cutting through time;In the step S2, the amount of pressurization of the ascending pipe is improved, the gas in the ascending pipe Know from experience gradually to coal seam seepage to be penetrated, cause the pressure at the ascending pipe downward trend occur, can by the step S2 Amount of pressurization in the ascending pipe is obtained so as to the effectively save energy to speculate;In the step S3, in order to accelerate passage and combustion Coal seam between dead zone is penetrated, it is necessary to which the air inflow for increasing the ascending pipe makes note to maintain the amount of pressurization of the ascending pipe Enter the gas in pipe endlessly to coal seam seepage to be penetrated, the pressure value at the aperture of the directional hole levels off to described During the pressure value of burned out area, illustrate that the coal seam to be penetrated between the passage and the burned out area is got through completely, penetrated Into.
2. the present invention coal seam gasification during, due to the ascending pipe pressure value and the passage end pressure Force value is different, in order to measure the end pressure value, can substantially react institute by pressure value at the aperture of the directional hole The pressure of end is stated, therefore pressure at the aperture for adjusting the directional hole is additionally provided between the step S1 and the step S2 and is Zero the step of.
3. the end of ascending pipe of the present invention is arranged near the end of the passage, so as to lead after avoiding coal seam dehydration The problem of causing coal seam to be caving in passage so as to block the ascending pipe.
4. in one embodiment of the invention, ventilated to ascending pipe, after there is pressure in the aperture of the directional hole, Aperture is diffused by water outlet at slow pressure release to aperture by the exhaust stack, the pressure in the aperture is reduced to zero, gasifying agent can The position to be penetrated is directly acted on, advantageously reduces cutting through time, improves insertion efficiency.
Obviously, above-described embodiment is only intended to clearly illustrate example, not to the restriction of embodiment.For For those of ordinary skill in the art, other various forms of changes or change can also be made on the basis of the above description It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change or change thus extended out Move still in the protection domain of the invention.

Claims (10)

1. a kind of subterranean coal penetrates method, during for by underground coal gasification(UCG) between prefabricated passage (11) and burned out area (12) Coal seam insertion, the passage (11) formed by the directional hole (11A) on ground in subterranean coal (10) extension, and the passage (11) end (11B) is close to the burned out area (12), it is characterised in that methods described comprises the following steps:
Step S1:Ascending pipe (13) is set in the directional hole (11A), passes through the injection gas pair into the ascending pipe (13) The end (11B) of the passage is nearby slowly pressurizeed, and the end of the terminal location of the ascending pipe (13) and the passage The distance at end (11B) is in 0.5m between 1.0m;
Step S2:The amount of pressurization of the ascending pipe (13) is improved, the pressure change at the ascending pipe (13) place is observed, if pressure is opened Begin to decline, show gas in the ascending pipe (13) to coal seam seepage to be penetrated;
Step S3:Increase the air inflow of the ascending pipe (13) to maintain the amount of pressurization of the ascending pipe (13);Described in observation Change value of pressure at the aperture of directional hole (11A), the pressure value at aperture level off to the pressure values of the burned out area (12) When, insertion is completed.
2. subterranean coal according to claim 1 penetrates method, it is characterised in that:The step S1 and step S2 it Between be additionally provided with the step of pressure is zero at the aperture for adjusting the directional hole (11A).
3. subterranean coal according to claim 2 penetrates method, it is characterised in that:The hole of the regulation directional hole (11A) The step of pressure is zero at mouthful is as follows:The directional hole (11A) aperture is sealed, by being arranged on below sealing station (11C) Exhaust stack (14) slowly reduce the aperture pressure until aperture at pressure be zero.
4. subterranean coal according to claim 3 penetrates method, it is characterised in that:There is water discharge in the exhaust stack (14) During ground, the pressure in the aperture is zero.
5. subterranean coal according to claim 1 penetrates method, it is characterised in that:In the step S2, by improving State the amount of pressurization of ascending pipe (13) and be passed through channel end (11B) air inflow to increase.
6. subterranean coal according to claim 5 penetrates method, it is characterised in that:The amount of pressurization of the ascending pipe (13) carries Gao Hou, the coal seam to be penetrated between the passage (11) and the burned out area (12) forms gap, so that the ascending pipe (13) gas in causes the pressure of the ascending pipe (13) to begin to decline to coal seam seepage to be penetrated.
7. subterranean coal according to claim 6 penetrates method, it is characterised in that:Ascending pipe (13) amount of pressurization is most High pressure should be less than the pressure that roof (10B) is born.
8. subterranean coal according to claim 1 penetrates method, it is characterised in that:In the step S3, in order to maintain The amount of pressurization of ascending pipe (13) is stated, the air inflow of the ascending pipe (13) gradually increases, and after air inflow is increased to setting value, protects Hold that the air inflow is constant, observe the change value of pressure at the directional hole (11A) aperture.
9. the subterranean coal insertion method according to any one in claim 1 or 5-8, it is characterised in that:The injection The end of (13) is managed near the end of the passage (11) (11B).
10. subterranean coal according to claim 1 penetrates method, it is characterised in that:The horizontal segment of the passage (11) is set There is supporting tubing (15).
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573531A (en) * 1980-02-21 1986-03-04 Vsesojuznoe Nauchno-Proizvod-Stvennoe Obiedinenie "Sojuzpromgaz" Method of underground gasification of coal seam
CN102477857A (en) * 2010-11-30 2012-05-30 新奥气化采煤有限公司 Passage formation method for underground coal gasification
CN102477856A (en) * 2010-11-30 2012-05-30 乌兰察布新奥气化采煤技术有限公司 Method for determining coal bed fractures
CN202612845U (en) * 2012-05-14 2012-12-19 株洲新奥燃气有限公司 Bleeder connecting component
CN103437748A (en) * 2013-09-04 2013-12-11 新奥气化采煤有限公司 Underground coal gasifying furnace and underground coal gasifying method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573531A (en) * 1980-02-21 1986-03-04 Vsesojuznoe Nauchno-Proizvod-Stvennoe Obiedinenie "Sojuzpromgaz" Method of underground gasification of coal seam
CN102477857A (en) * 2010-11-30 2012-05-30 新奥气化采煤有限公司 Passage formation method for underground coal gasification
CN102477856A (en) * 2010-11-30 2012-05-30 乌兰察布新奥气化采煤技术有限公司 Method for determining coal bed fractures
CN202612845U (en) * 2012-05-14 2012-12-19 株洲新奥燃气有限公司 Bleeder connecting component
CN103437748A (en) * 2013-09-04 2013-12-11 新奥气化采煤有限公司 Underground coal gasifying furnace and underground coal gasifying method

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