CN103437748A - Underground coal gasifying furnace and underground coal gasifying method - Google Patents
Underground coal gasifying furnace and underground coal gasifying method Download PDFInfo
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- CN103437748A CN103437748A CN2013103985636A CN201310398563A CN103437748A CN 103437748 A CN103437748 A CN 103437748A CN 2013103985636 A CN2013103985636 A CN 2013103985636A CN 201310398563 A CN201310398563 A CN 201310398563A CN 103437748 A CN103437748 A CN 103437748A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
Abstract
The invention provides an underground coal gasifying furnace which comprises an ignition system and a gas injection system, wherein the ignition system is provided with a first vertical drilling well (1) and a first horizontal directional drilling well (a) communicated with the first vertical drilling well; the gas injection system is provided with a second drilling well communicated with a coal seam; at least one second horizontal directional drilling well (b, c, d, e and f) of a horizontal section in the coal seam serves as the second drilling well. The invention also provides an underground coal gasifying method. By adopting the underground coal gasifying furnace and the underground coal gasifying method provided by the invention, the defects of low cut-through speed and unstable structure in a gasifying production section of the prior art are eliminated.
Description
Technical field
The present invention relates to a kind of coal underground gasifying furnace, and coal underground gasification method.
Background technology
Underground coal gasification(UCG) is had the coal in underground the burning of control, produces the process of fuel gas by the heat effect to coal and chemical action.Underground gasification furnace usually by air inlet well, gasification tunnel, go out gas well and the auxiliary monitoring well is formed, gasifying agent injects from the air inlet well, in gasification tunnel, with coal seam, complicated thermal chemical reaction occurs, the coal gas of generation is along gasification tunnel and go out gas well and be delivered to ground.
The underground gasification type of furnace of narrow sense refers to the shape of gasification tunnel, the channel shape that the purposes when underground gasification type of furnace of broad sense refers to type, mutual alignment, the gasification of underground gasification boring used and boot sequence etc. form.
Only have a pair of gasification type of furnace gas production of advancing/go out gas well smaller, less combustion zone is difficult to gather a large amount of heat energy, and corresponding heat waste is larger, a little less than resisting the ability that underground water invasion gasification furnace, roof inbreak result in blockage, and then gasification also is difficult to stable carrying out.When current gasification furnace has developed into numerous boring by boring type (Vertical Well, horizontal directional drilling), the spacing of wells, gasification, the trend of air-flow and combustion zone trend etc. are combined into various types of underground gasification furnaces, the stability of gas yield, gasification, the recovery ratio in coal seam can be improved exponentially, and the risk of underground water invasion, roof collapse, heat waste etc. can be effectively reduced.
Therefore, the gasification type of furnace is one of key factor determined the gasification success or failure.
Prior art one: peace Green's the underground gasification unit type of furnace.Due to peace Green underground gasification station Time Created (20th century the forties) relatively for a long time, geological conditions is special, mainly continues to use vertical drilling well, the collateral use directed drilling, play vertical drilling well thick and fast, by the air pressure break, connects, move the guiding combustion zone, as shown in Figure 1.
Prior art two: patent 200810119354.2, no-shaft underground gasification process, provided a kind of " L " shape underground gasification furnace, main feature is that a horizontal directional drill connects a plurality of vertical drilling holes and forms " one " line oven as the row of giving vent to anger, be that openings in Fig. 2 is to 6# mono-line, the high pressure firepower connects other a plurality of vertical drilling holes and forms " one " line ovens as the gasification row, i.e. 6# to 9# one line, and both form " L " type underground gasification furnace jointly.In the expanding production stage, after gasification furnace forms, will beat and the vertical hole of the first row of 5#～9# in the 3# of 5# to 9# one line mono-side, carry out the perforation of high pressure firepower and 5#～9#, make a call to successively n row vertical drilling hole, the guiding combustion front moves to the openings direction, and from openings to 6#, the boring mono-line drains into ground to the coal gas of output.
The shortcoming of prior art one is that air pressure break perforation directionality is poor, perforation speed is slow.
The shortcoming of prior art two is: 1. the structure difficulty of gasification furnace is large, structure is stable not, and a horizontal directional drill runs through a plurality of vertical drilling wells and is difficult for realizing, has both made to realize, follow-up if do not utilized as early as possible, exists drilling well to stop up risk; 2. connecting---the circulation of production, operation easier is large.Many row's Vertical Well all need the high pressure firepower to connect, and are ceaselessly carrying out the perforation of high pressure firepower---and in the cyclic switching that gasification is produced, operation easier is large.
Summary of the invention
For the Related Technical Issues of prior art, the object of the present invention is to provide a kind of coal underground gasifying furnace and coal underground gasification method, thereby at least eliminate slow, the structural unstable defect of gasification production phase perforation speed in prior art.
On the one hand, the invention provides a kind of coal underground gasifying furnace, comprise: ignition system, there is the first vertical drilling well of passing into coal seam and horizontal segment in coal seam and with the first horizontal directional drilling of the first vertical drilling well conducting, gas injection system, have the second drilling well that passes into coal seam, with described the first horizontal directional drilling conducting, described the second drilling well is at least one in coal seam of horizontal segment the second horizontal directional drilling.
Preferably, described the first horizontal directional drilling is with mode and the described second horizontal directional drilling conducting of firepower reaming.
Preferably, described the second drilling well is at least two described the second horizontal directional drillings parallel to each other, along with the crossing direction of the first horizontal directional drilling, being arranged in its one or both sides.
Preferably, described the second horizontal directional drilling and the first horizontal directional drilling are the angle of 30 °-90 °.
Preferably, along described the first horizontal directional drilling, be provided with at least one second vertical drilling well, wherein, by the firepower reaming of the first horizontal directional drilling, all second vertical drilling well communicates with each other to form and gas well.
Preferably, the horizontal segment end of described the first horizontal directional drilling, with firepower perforation or directional blasting or cold conditions pressure break mode and the described first vertical drilling well conducting.
Preferably, the horizontal segment end of described the first horizontal directional drilling, directly connect with the described first vertical drilling well.
Preferably, described the second drilling well is at least two described the second horizontal directional drillings, be arranged in the same side of the first horizontal directional drilling, one of them second horizontal directional drilling points to and connects mode and the described first vertical drilling well conducting with pressure break, be furnished with at least one the 3rd vertical drilling well along this second horizontal directional drilling, wherein, this second horizontal directional drilling forms and gas well together with the 3rd vertical drilling well conducting also by the firepower reaming.
Preferably, in all drilling wells (comprising horizontal directional drilling and Vertical Well), each drilling well be positioned at Zhong Luo hole, coal seam section by the suspension device supporting.
Preferably, described suspension device is screen casing or seamless pipe.
Preferably, at least in described second horizontal directional drilling, be provided with the gasifying agent access tube that can pull, its gas injection end is pulled and is moved with described gasifying agent access tube.
The invention provides on the other hand a kind of coal underground gasification method, comprising: build the coal underground gasifying furnace step, described coal underground gasifying furnace is the aforementioned arbitrary coal underground gasifying furnace of the present invention; And the step gasified in the gasification furnace built, it comprises: guide the burning flame range of the first horizontal directional drilling to retreat in the second horizontal directional drilling, until retreat near the entering coal point of described the second horizontal directional drilling.
Preferably, the step that builds coal underground gasifying furnace comprises the sub-step 1-2 carried out successively as follows: sub-step 1: get out successively sequentially: first horizontal directional drilling of the first vertical drilling well, horizontal segment that passes into coal seam in coal seam, along at least two second vertical drilling wells of the first horizontal directional drilling layout and be arranged in the first horizontal directional drilling one or both sides and at least two second horizontal directional drillings of horizontal segment in coal seam, and all these drilling wells that get out cut off each other; And sub-step 2, first described the first horizontal directional drilling of conducting and the described first vertical drilling well, then light coal seam in the described first vertical borehole bottom, from the first horizontal directional drilling injected gas agent, guiding burning flame range moves with to described the first horizontal directional drilling firepower reaming, until with described sub-step 1 in all the other all drilling well conductings.
Preferably, when described the first horizontal directional drilling is carried out to described firepower reaming, in described the second horizontal directional drilling, pass into pressure air, the pressure of this pressure air is greater than the pressure in described the first horizontal directional drilling.
Preferably, the described burning flame range of the guiding in described sub-step 2 moves, and by pulling in described the first horizontal directional drilling coiled tubing, its gas injection end is moved carry out.
Preferably, against the growth direction of cracks in coal seam, to the first vertical drilling well, bore the first horizontal directional drilling.
Preferably, the step that builds coal underground gasifying furnace comprises the sub-step 1-3 carried out successively as follows: sub-step 1: grow direction along cracks in coal seam and get out successively the first vertical drilling well be spaced apart from each other and at least two second vertical drilling wells that pass into coal seam, another mistake cracks in coal seam growth direction and is made a call to the first horizontal directional drilling to the direction of the first vertical drilling well, and it connects the first vertical drilling well and a part the second vertical drilling well in coal seam, sub-step 2: in a side of the first horizontal directional drilling, get out at least two the second horizontal directional drillings that end points to the first horizontal directional drilling, wherein the end of a part of the second horizontal directional drilling communicates with the first horizontal directional drilling, and the end of another part the second horizontal directional drilling and the first horizontal directional drilling are in a distance, sub-step 3: at the first horizontal directional drilling, be lowered to coiled tubing, from the gas injection end of coiled tubing to the first horizontal directional drilling injected gas agent, light coal seam in the first vertical borehole bottom, pulling coiled tubing guiding burning flame range moves with to described the first horizontal directional drilling firepower reaming, until connect with described another part the second horizontal directional drilling and the vertical drilling well of another part second.
Preferably, described sub-step 2 also comprises: in a side of the first horizontal directional drilling, play the 4th vertical drilling well to coal seam, and with the second horizontal directional drilling, connect correspondingly respectively, in the process gasified in the gasification furnace built, burning flame range in the second horizontal directional drilling moved to for the 4th vertical drilling well lower time, and the 4th vertical drilling well is replaced to the first vertical drilling well, the second vertical drilling well and the first horizontal directional drilling as going out gas well.
Preferably, when in pulling a part of the second horizontal directional drilling, the gasifying agent access tube moves the burning flame range, with another part the second horizontal directional drilling for going out gas well, wherein, this another part second horizontal directional drilling is withdrawn from the gasifying agent access tube as going out under the situation of gas well wherein, and the first horizontal directional drilling, the first vertical drilling well and the second vertical drilling well that is provided with are closed.
Preferably, the step that builds coal underground gasifying furnace comprises: (I) build gasification furnace ignition system and the system of giving vent to anger, it comprises: get out successively the following drilling well that passes into coal seam: the first horizontal directional drilling in coal seam of the first vertical drilling well, orthogonal and horizontal segment and second horizontal directional drilling, distinguish the second vertical drilling well and the 3rd vertical drilling well of arranged crosswise along these two horizontal directional drillings; Then, these two horizontal directional drillings and the first vertical drilling fracturing are connected, the first horizontal directional drilling of firepower reaming afterwards forms ignition system until connect the second vertical drilling well along the line, and firepower reaming the second horizontal directional drilling forms until connect the 3rd vertical drilling well along the line the system of giving vent to anger; And (II) when building gasification furnace ignition system and the system of giving vent to anger, beat other second horizontal directional drilling parallel with described second horizontal directional drilling, its horizontal segment is in coal seam and the horizontal segment end points to the first horizontal directional drilling and by pressed gas pressure break mode and the perforation of the first horizontal directional drilling.
Preferably, described firepower reaming is embodied as: in the first vertical drilling well, light coal seam, pull the gas injection end of coiled tubing in the first horizontal directional drilling and described second horizontal directional drilling, guiding burning flame range moves and carries out the firepower reaming along these two horizontal directional drillings.
The useful technique effect of coal underground gasifying furnace of the present invention and underground coal gasification(UCG) is: slow, the structural unstable defect of perforation speed in the elimination prior art gasification production phase.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of peace Green's underground gasification unit stove in prior art one;
Fig. 2 is the schematic diagram of " L " shape underground gasification furnace structure in prior art two;
Fig. 3 is the schematic diagram of the coal underground gasifying furnace frame construction before coal underground gasifying furnace moulding of the present invention;
Fig. 4 is the coal underground gasifying furnace frame construction drawing of the embodiment 1 of coal underground gasifying furnace of the present invention;
Fig. 5 is the coal underground gasifying furnace frame construction drawing of the embodiment 2 of coal underground gasifying furnace of the present invention;
Fig. 6 is the coal underground gasifying furnace frame construction drawing of the embodiment 3 of coal underground gasifying furnace of the present invention;
Fig. 7 is the coal underground gasifying furnace frame construction drawing of the embodiment 4 of coal underground gasifying furnace of the present invention.
The specific embodiment
Below referring to accompanying drawing 3-7, the specific embodiment of coal underground gasifying furnace of the present invention and coal underground gasification method is described.
Fig. 3 illustrates an example of coal underground gasifying furnace frame construction, wherein each drilling well cuts off (i.e. not conducting each other, perhaps in a distance or be isolated from each other), when each drilling well conducting, the coal underground gasifying furnace framework just is built into coal underground gasifying furnace.Therefore, referring to Fig. 3, describe coal underground gasifying furnace of the present invention, it comprises: ignition system and gas injection system.Ignition system there is the first vertical drilling well 1 of passing into coal seam and horizontal segment in coal seam and with the first horizontal directional drilling a of the first vertical drilling well 1 conducting; Gas injection system has the second drilling well that passes into coal seam, this second drilling well and the first horizontal directional drilling a conducting, and wherein the second drilling well is at least one in coal seam of horizontal segment the second horizontal directional drilling b, c, d, e, f.
As a kind of optimal way, can at least in second a horizontal directional drilling b, c, d, e, f, be provided with the gasifying agent access tube that can pull, its gas injection end is pulled and is moved with the gasifying agent access tube.
Below continue referring to Fig. 3, from following (1)-(3), describe an example of coal underground gasifying furnace of the present invention and coal underground gasification method in detail:
(1) gasification type of furnace framework builds the stage: according to geologic information, determine cracks in coal seam growth direction to be gasified, first in coal seam, a bit play one first vertical drilling well 1 to the middle and lower part, coal seam, grow direction against cracks in coal seam and make a call to the first horizontal directional drilling a, the horizontal segment of the first horizontal directional drilling a is positioned at the middle and lower part, coal seam, end points to the first vertical drilling well 1, and, with it at a distance of 5～20m, form ignition system; Then, at both sides 5～20m, the space 30～50m of the first horizontal directional drilling a, play the second vertical drilling well 2～6, be drilled into the middle and lower part, coal seam, form the system of giving vent to anger.Finally, again with the first horizontal directional drilling a preferably be 30 °～90 ° angles (the angle here be the first horizontal directional drilling, with the second horizontal directional drilling angle of projection on the ground) direction get out a plurality of second horizontal directional drilling b～f parallel to each other, form gas handling system, (the end of these second horizontal directional drillings b～f and the first horizontal directional drilling a cut off, not conducting), and at a distance of 5～20m.This distance is that the radius according to passage after the firepower reaming adds that the be heated length of rear cranny development of coal seam is estimated, the complete a bite well of every brill is preferably in naked hole, coal seam section and is lowered to the suspension device supporting of being holed, suspension device can be screen casing or seamless pipe, material can be PVC, combustible material or glass fiber reinforced plastic, preferred seamless glass reinforced plastic pipe.
(2) gasifying stage: purpose is make the underground gasification furnace moulding and start large-scale production.At first, connect the first horizontal directional drilling a and the first vertical drilling well 1 by directional blasting, cold conditions pressure break or firepower, then, at the coal-fired layer of the first vertical drilling well 1 base point, from the first horizontal directional drilling a injected gas agent, guiding burning flame range moves (being that retrusive moves) to the direction of the second vertical drilling well 6, the first horizontal directional drilling a that burns coal seam on every side is to enlarge the diameter of the first horizontal directional drilling a, in this process, be preferably in pressurization (pressurizeing by coiled tubing) in the second vertical drilling well 2～6 and horizontal directional drilling b～f, pressure is a little more than the pressure of the first horizontal directional drilling a, pressure variation by the second vertical drilling well 2～6 and horizontal directional drilling b～f judges whether and the first horizontal directional drilling a conducting.Also can be to the second vertical drilling well 2～6 and the second horizontal directional drilling b～f pressurization, the coal combustion of the first horizontal directional drilling a horizontal segment until by all vertical drilling wells and directed drilling all with the combustion zone conducting, the structure of coal underground gasifying furnace just completes.That is,, in coal underground gasifying furnace, the first horizontal directional drilling a connects and connects with the second horizontal directional drilling b～f by firepower reaming and all second vertical drilling well 2～6.
(3) last, select a part of drilling well when giving vent to anger system, gas handling system is worked as in part drilling well, the gas injection end of coiled tubing is lowered to each drilling well of gas handling system, control gas injection speed by coiled tubing, the coal seam in gasification gas injection end the place ahead, when the content of the active principle in the coal gas of producing has obvious decline, pull equipment by coiled tubing gas injection end recession 20～30m by ground, continuing gas injection guiding combustion zone moves to the coiled tubing direction, while again obviously descending Deng active principle content in coal gas, the coiled tubing of again dropping back, until extending to directed drilling, combustion zone enters near coal point.
According to the purposes of coal gas, at pressure break, firepower, connect and gasifying stage, the gas of use is preferably consistent, in order to avoid cause harmful effect to the follow-up workshop section of coal gas.Such as, coal gas is for combustion power generation, and each stage use gas is all preferably oxygen-enriched air; Coal gas is for the synthesis of methane, and each stage use gas is all preferably pure oxygen water vapour, pure oxygen or pure oxygen/carbon dioxide.
Below from implementing 1-embodiment 4, further illustrate coal underground gasifying furnace of the present invention and coal underground gasification method.
[embodiment 1]
Take the thick bituminous coal of the horizontal 10m coal seam of somewhere 500m buried depth as example illustrates coal underground gasifying furnace of the present invention and coal underground gasification method.
At first, play one first vertical drilling well 1 to the middle and lower part, coal seam referring to Fig. 4 at the selection area of building underground gasification furnace, grow direction against cracks in coal seam and make a call to the first horizontal directional drilling a to the first vertical drilling well 1, the first horizontal directional drilling a is 250m in the length of the horizontal drilling of middle and lower part, coal seam, in the both sides 5m of the first horizontal directional drilling a left and right, at interval of 25m, play one second vertical drilling well 2～7 to the middle and lower part, coal seam, the second vertical drilling well 2～7 is alternately distributed the both sides at the first horizontal directional drilling a.
Then, both sides at the first horizontal directional drilling a, beat a plurality of second horizontal directional drill b～k that are parallel to each other to Directional Drilling a from afar, in the horizontal drilling length of middle and lower part, coal seam all more than 200m, adjacent two the second horizontal directional drilling spacing 25m, beat to the distance about 5m of the first horizontal directional drilling a left and right, with the first horizontal directional drilling a, cut off (that is, not conducting).No matter be vertical drilling well or horizontal well, all to be lowered to seamless glass reinforced plastic pipe in Duan Luo hole, coal seam and carry out supporting after completion, now, the frame construction of gasification furnace is as shown in Figure 4.
After this, give the first horizontal directional drilling a about 4.0MPa of air that adds high pressure by coiled tubing, carry out connecting with the pressure break of the first vertical drilling well 1, after perforation, light the coal seam of the first vertical drilling well 1 bottom, inject air from the first horizontal directional drilling a, burning flame range under the gas injection rate guiding first vertical drilling well 1 of control coiled tubing moves to the direction of the second vertical drilling well 7, form ignition system, during this period, to the second vertical drilling well 2～7 air that adds high pressure, the gas injection end of coiled tubing is lowered to second horizontal directional drilling b～g to the about 20m of distance the first horizontal directional drilling a, inject pressure-air by coiled tubing to the second horizontal directional drilling b～g, pressure is a little more than the about 0.5MPa of the pressure of the first horizontal directional drilling a, according to the pressure variation of each drilling well, judge whether to connect.Until the second vertical drilling well 2～7 and the first horizontal directional drilling a connect and second horizontal directional drilling b～g and the first horizontal directional drilling a perforation.
Finally, with the first vertical drilling well 1 and the second vertical drilling well 2～7 and the first horizontal directional drilling a, give vent to anger, form the system of giving vent to anger, utilize coiled tubing to continue to inject air to the second horizontal directional drilling b and g, carry out the reverse combustion gasification, when the active principle content in the coal gas of producing has obvious decline after steady a period of time, coiled tubing towing device by ground is by gas injection end recession 20m, continue to inject air, guiding burning flame range is expanded to the gas injection end position, in coal gas, active principle content rises, while steadily obviously descending again after a period of time, recession again, until the burning flame range extends near entering coal point of the second horizontal directional drilling b and g, the coal resources of the second horizontal directional drilling b and g control are fallen in gasification.
Coiled tubing gas injection end is lowered to the second horizontal directional drilling c and h, operation as the second horizontal directional drilling b and g is the same, the coal resources of the second horizontal directional drilling c and h control are fallen in gasification, similar, and the coal resources of the second horizontal directional drilling d and i, e and j, f and k control are fallen in gasification successively.Also can, when the second horizontal directional drilling b and g gasify to half, start the gasification of the second horizontal directional drilling c and h.So, all gasified and in a slice coal seam, realized the large-scale production of underground gasification technology.
In Fig. 3, the crossing direction of the second horizontal directional drill well and the first horizontal directional drilling a is arranged in the first horizontal directional drilling a mono-side, and shown in Fig. 4: the crossing direction of the second horizontal directional drill well and the first horizontal directional drilling a is arranged in the both sides of the first horizontal directional drilling a.
[embodiment 2]
Take the thick brown coal of the horizontal 8m coal seam of somewhere 300m buried depth as example illustrates coal underground gasifying furnace of the present invention and coal underground gasification method.
At first, in zone, the selected coal seam of underground gasification, determine cracks in coal seam according to geological information and grow direction, as arrow direction in Fig. 5.Select a bit and play the first vertical drilling well 1 to the middle and lower part, coal seam, grow direction along cracks in coal seam and play the second vertical drilling well to the middle and lower part, coal seam at interval of the 35m left and right, numbering 2, 3, 4, 5, 6, a bit to the direction of the first vertical drilling well 1, making a call to the first horizontal directional drilling a against the cracks in coal seam direction again, the about 250m of horizontal segment drilling well length in the middle and lower part, coal seam, this horizontal directional drilling connects the first vertical drilling well 1 as far as possible in the middle and lower part, coal seam, an and part the second vertical drilling well (for example the second vertical drilling well 4, 6), and the vertical drilling well of another part second (for example the second vertical drilling well 2, 3, 5) far away at 5～20m with the distance of the first horizontal directional drilling a.
Then, in the about 100m of the side position far away of the first horizontal directional drilling a, play vertical drilling well to the middle and lower part, coal seam, be numbered 1 ", 2 ", 3 ", 4 ", 5 ", about space 35m.The same side at the first horizontal directional drilling a, beat a plurality of the second horizontal directional drilling b, c, d, e, f that are parallel to each other to the first horizontal directional drilling a, in the drilling well length of middle and lower part, coal seam more than 200m, wherein the second horizontal directional drilling b, d, f as far as possible and the first horizontal directional drilling a connect, and the end-to-end distance of the second horizontal directional drilling c and e is from the first horizontal directional drilling a approximately away from 5～20m.The second horizontal directional drilling b, c, d, e, f can with the 4th vertical drilling well 1 "～5 " connect, can not connect yet.Now, the gasification furnace frame construction built as shown in Figure 5.
After this, the gas injection end that overlaps coiled tubing is lowered to respectively to the first horizontal directional drilling a and the second horizontal directional drilling b, c, d, e, f more, wherein the gas injection end in the first horizontal directional drilling a is apart from the first vertical drilling well 1 about 20m in shaft bottom, and the gas injection end in the second horizontal directional drilling b, c, d, e, f is apart from the about 20m of the first horizontal directional drilling a.Inject O from coiled tubing gas injection end to the first horizontal directional drilling a
2/ CO
2gasifying agent, at the coal-fired layer of the first vertical drilling well 1 base point, at O
2/ CO
2under the cooperation of gasifying agent, burning starts expansion, and when in produced coal gas, active principle content obviously descends, the towing device by ground, by the gas injection end of coiled tubing recession 20m, continues to inject O
2/ CO
2gasifying agent, guiding burning flame range moves to the second vertical drilling well 6, until the burning flame range extends to the second vertical drilling well 6 bottoms.Combustion Energy expands to the 1.5m left and right by the channel diameter of the first horizontal directional drilling a, in the case, originally with obstructed vertical drilling well and directed drilling (the second horizontal directional drilling c, the e of the first horizontal directional drilling a, and the second vertical drilling well 2,3,5) under heat effect, can connect with the first horizontal directional drilling a, now, the structure of gasification furnace completes.
Finally, using first vertical drilling well the 1, second vertical drilling well 2,3,4,5,6 and the first horizontal directional drilling a as going out gas well, form the system of giving vent to anger, using the second horizontal directional drilling b, c, d, e, f as gas injection well, form gas injection system, start coiled tubing simultaneously and inject O to the burning flame range
2/ CO
2gas, control gas injection rate guiding burning flame range, to the expansion of gas injection end, when in produced coal gas, the content of active principle obviously descends, is dropped back the gas injection end of coiled tubing about 20m by the towing device on ground, continues to inject O
2/ CO
2gas, as above repeatedly, guiding burning flame range from vertical drilling well 1～6 along the line to the 4th vertical drilling well 1 "～6 " along the line mobile, when burning, flame range moves to vertical drilling well 1 "～6 " lower time, can be by the 4th vertical drilling well 1 "～6 " change out the task of giving vent to anger that gas well is taken over the former system of giving vent to anger into.A plurality of directed drillings gasify simultaneously, have realized the large-scale production of underground gasification technology.
[embodiment 3]
Take the thick ub-bituminous coal of the 12m coal seam of somewhere 600m buried depth as example illustrates coal underground gasifying furnace of the present invention and coal underground gasification method.
At first, play one first vertical drilling well 1 to the middle and lower part, coal seam referring to Fig. 6 at the selection area of building underground gasification furnace, grow direction against cracks in coal seam and make a call to the first horizontal directional drilling a to the first vertical drilling well 1, the first horizontal directional drilling a is 250m in the length of the horizontal drilling of middle and lower part, coal seam, at side 5～15m place of the first horizontal directional drilling a, at interval of the 100m left and right, play one second vertical drilling well 2,3 to the middle and lower part, coal seam, be distributed in the homonymy of the first horizontal directional drilling a.
Then, both sides at the first horizontal directional drilling a, beat a plurality of second horizontal directional drilling b～k that are parallel to each other to the first horizontal directional drilling a from afar, in the horizontal drilling length of middle and lower part, coal seam all more than 200m, adjacent two the second horizontal directional drilling spacing 30m, beat to the about 5～20m place of distance the first horizontal directional drilling a, with the first horizontal directional drilling a partition (that is, not conducting).No matter be vertical drilling well or horizontal well, Duan Luo hole, coal seam all will be lowered to seamless glass reinforced plastic pipe and carries out supporting after the completion, and now, the frame construction of gasification furnace as shown in Figure 6.
After this, coiled tubing and gas injection end thereof are lowered to the first horizontal directional drilling a, gas injection end distance the first vertical drilling well 1 about 15m in bottom in coal seam, inject oxygen-enriched air by coiled tubing gas injection end to the first horizontal directional drilling a, the about 4.0MPa of pressure, carry out connecting with the pressure break of the first vertical drilling well 1, after perforation, light the coal seam of the first vertical drilling well 1 bottom, inject oxygen-enriched air by coiled tubing to the first horizontal directional drilling a, controlling gas injection rate guiding burning flame range moves to the gas injection end, when in generating coal gas, the content of active principle has obvious decline, pull equipment by coiled tubing gas injection end recession 20m by ground, guiding burning flame range continues to move to the gas injection end, until the burning flame range moves to the bottom of the second vertical drilling well 3, form the ignition system of gasification furnace.Plaing the second vertical drilling well 2 and 3 is in order to prevent that ignition system burning progress from having some setbacks, or the indivedual drilling wells of the system of giving vent to anger future are not handy.
Finally, close advancing/giving vent to anger of i.e. the first vertical drilling well 1 of ignition system and the first horizontal directional drilling a, close other vertical drilling wells, withdraw from the second horizontal directional drilling c, e, h, coiled tubing in j, using these wells as going out gas well, utilize coiled tubing to continue to the second horizontal directional drilling b, d, f, g, i, inject oxygen-enriched air in k, carry out the reverse combustion gasification, when the active principle content in grown coal gas has obvious decline, coiled tubing towing device by ground is by gas injection end recession 20m, continue to inject oxygen-enriched air, guiding burning flame range is expanded to the gas injection end position, coal gas active principle content raises stable, while again obviously descending, the gas injection end of again dropping back, until the burning flame range extends near entering coal point of directed drilling.So, realized the large-scale production of underground gasification technology.
[embodiment 4]
To first by vertical drilling well and directed drilling, build the ignition system of gasification furnace and the system of giving vent to anger in the present embodiment.As shown in Figure 7, specific as follows:
At first, a bit make a call to the middle and lower part of the first vertical drilling well 1 to coal seam in certain of coal seam to be gasified;
Then, from afar to 1 dozen of mutually perpendicular the first horizontal directional drilling a of the first vertical drilling well and the second horizontal directional drilling b, in the horizontal segment drilling well length of middle and lower part, coal seam all more than 200m, the horizontal segment drilling well end of these two drilling wells all points to the first vertical drilling well 1, but the about 7m in bottom of distance the first vertical drilling well 1 is far away;
Again then, in the both sides 10m of the first horizontal directional drilling a, at interval of the 70m left and right, make a call to the middle and lower part of one second vertical drilling well to coal seam, cross-distribution, in the both sides of the first horizontal directional drilling a, is numbered 2,3,4; Play one the 3rd vertical drilling well to the middle and lower part, coal seam at interval of the 30m left and right in the both sides 10m of the second horizontal directional drilling b, cross-distribution, in the both sides of the second horizontal directional drilling b, is numbered 2 ', 3 ', 4 ', 5 ', 6 ', 7 ', 8 ', 9 ', 10 ';
Finally, pass into coiled tubing and gas injection end thereof in the first horizontal directional drilling a and the second horizontal directional drilling b, the bottom of gas injection end distance the first vertical drilling well 1 is all in the 15m left and right, inject the perforation of the realization of pressure-air pressure break and the first vertical drilling well 1, light coal seam in the first vertical drilling well 1 afterwards, control the gas injection rate of coiled tubing, guiding burning flame range moves and carries out the firepower reaming along the first horizontal directional drilling a and the second horizontal directional drilling b, the first vertical drilling well 1 is used for output coal gas, when in coal gas, the content of active principle has obvious decline, the equipment that pulls by ground is by coiled tubing gas injection end recession 15m, continuing to inject air guiding burning flame range moves.Through recession coiled tubing gas injection end repeatedly, the equivalent diameter of the first horizontal directional drilling a and the second horizontal directional drilling b can reach 1.5m, the external heat effect promotes cracks in coal seam to grow, and can connect the first horizontal directional drilling a and the second horizontal directional drilling b the 3rd vertical drilling well 2 ' along the line～10 ' and second vertical drilling well 2～4.Now, the ignition system (the first horizontal directional drilling a and the along the line second vertical drilling well thereof) of this gasification type of furnace and the system of giving vent to anger (the second horizontal directional drilling b and the along the line the 3rd vertical drilling well thereof) have been formed.
When building gasification furnace ignition system and the system of giving vent to anger, can beat other second horizontal directional drilling c, d, e, f, all be parallel to aforementioned the second horizontal directional drilling b, end points to the first horizontal directional drilling a, in the horizontal segment drilling well length of middle and lower part, coal seam more than 200m, all be lowered to coiled tubing and gas injection end thereof after completion, by high pressure fracture, complete the perforation with ignition system.As previously mentioned, utilize the system produce coal gas of giving vent to anger, by coiled tubing, drop back and guide the burning flame range to burn along directed drilling, according to the significant change recession gas injection end of active principle in coal gas, gasification when carrying out a plurality of horizontal directional drilling.To be lowered in time the supporting that seamless glass reinforced plastic pipe carries out naked hole, coal seam section after each drilling completion.
According to the above description referring to Fig. 3-Fig. 7, coal underground gasification method of the present invention comprises: the step that builds the aforementioned arbitrary coal underground gasifying furnace of the present invention; And the step gasified in coal underground gasifying furnace, it comprises: guide the burning flame range of the first horizontal directional drilling a to retreat in the second horizontal directional drilling, until retreat into the second horizontal directional drilling enter the coal point.
Be appreciated that the burning flame range for guiding the first horizontal directional drilling a retreats in the second horizontal directional drilling, can pull gasifying agent access tube at least one second horizontal directional drilling b-g and realize.
For further understanding coal underground gasification method of the present invention, below according to referring to the description of Fig. 3, Fig. 4, Fig. 6, referring to the description of Fig. 5 and referring to the description of Fig. 7, coal underground gasification method of the present invention is further illustrated:
According to the description referring to Fig. 3, Fig. 4, Fig. 6, known, the step that builds coal underground gasifying furnace comprises sub-step 1 and the sub-step 2 of carrying out successively.Wherein sub-step 1 is, get out successively sequentially: first horizontal directional drilling a, at least two the second vertical drilling wells 2,3,4,5,6 of along first horizontal directional drilling a arranging of the first vertical drilling well 1, horizontal segment that passes into coal seam in coal seam and be arranged in the first horizontal directional drilling a one or both sides and at least two second horizontal directional drilling bs, c, d, e, the f of horizontal segment in coal seam, all these drilling wells that get out cut off (that is, not conducting) each other.Sub-step 2 is: first conducting the first horizontal directional drilling a and the described first vertical drilling well 1, then at the coal-fired layer of the first vertical drilling well 1 base point, from the first horizontal directional drilling a injected gas agent, guiding burning flame range moves with to described the first horizontal directional drilling firepower reaming, until with sub-step 1 in all the other all drilling well conductings.
According to the description referring to Fig. 5, known, the step that builds coal underground gasifying furnace comprises sub-step 1, sub-step 2 and the sub-step 3 of carrying out successively.Sub-step 1: grow direction along cracks in coal seam and get out successively the first vertical drilling well 1 be spaced apart from each other and at least two second vertical drilling wells 2,3,4,5,6 that pass into coal seam, another mistake cracks in coal seam growth direction and is made a call to the first horizontal directional drilling a to the direction of the first vertical drilling well 1, and it connects the first vertical drilling well 1 and a part the second vertical drilling well 4,6 in coal seam, sub-step 2: in the side of the first horizontal directional drilling a, get out at least two the second horizontal directional drilling b that end points to the first horizontal directional drilling a, c, d, e, f, a part of the second horizontal directional drilling b wherein, d, the end of f communicates with the first horizontal directional drilling a, and another part the second horizontal directional drilling c, the end of e and the first horizontal directional drilling a are in a distance (, cut off or not conducting), sub-step 3: at the first horizontal directional drilling a, be lowered to coiled tubing, from the gas injection end of coiled tubing to the first horizontal directional drilling a injected gas agent, at the coal-fired layer of the first vertical drilling well 1 base point, pulling coiled tubing guiding burning flame range moves with to the first horizontal directional drilling a firepower reaming, until with another part the second horizontal directional drilling c, e and the vertical drilling well 2 of another part second, 3, 5 connect.
According to the description referring to Fig. 7, known, the step that builds coal underground gasifying furnace comprises following (I) and (II).Particularly, (I) build gasification furnace ignition system and the system of giving vent to anger, it comprises: get out successively the following drilling well that passes into coal seam: the first horizontal directional drilling a in coal seam of the first vertical drilling well 1, orthogonal and horizontal segment and second horizontal directional drilling b, distinguish the second vertical drilling well 2,3,4 and the 3rd vertical drilling well 2 '-10 ' of arranged crosswise along these two horizontal directional drillings; Then, these two horizontal directional drillings and the first vertical drilling well 1 pressure break are connected, the the first horizontal directional drilling a of firepower reaming afterwards forms ignition system until connect the second vertical drilling well 2,3,4 along the line, and firepower reaming the second horizontal directional drilling b forms until connect the 3rd vertical drilling well 2 '-10 ' along the line the system of giving vent to anger; (II) when building gasification furnace ignition system and the system of giving vent to anger, beat other second horizontal directional drilling c, d, e, the f parallel with described second a horizontal directional drilling b, its horizontal segment is in coal seam and the horizontal segment end points to the first horizontal directional drilling a and by high pressure gas fracturing mode and the first horizontal directional drilling a perforation.
To sum up, the present invention proposes coal underground gasifying furnace and coal underground gasification method:
1) coal underground gasifying furnace is simple in structure, and each drilling well is separate, can creep into simultaneously, can shorten gasification tunnel and build the time, reduces and build the stove cost;
2) be lowered to immediately the drilling well suspension device after completion, further protected the structural stability of underground gasification furnace;
3) with single horizontal directional drilling gasification, compare, many horizontal directional drillings carry out the retrusive gasification simultaneously, can effectively control the scope of subsiding of roof, prevent groundwater pollution;
4) multiple row gasifies simultaneously and can form a larger combustion front, and the heat waste of gasification furnace can reduce, and improves the rate of extraction, the gasification efficiency of coal;
5) movement of the easier control combustion flame range of retrusive gasification is carried out in drilling well simultaneously, particularly to the gasification of pure oxygen class gasifying agent, such as: pure oxygen-water vapour, pure oxygen-carbon dioxide, pure oxygen-water vapour-gasifying agents such as carbon dioxide;
6) the pattern air inlet in a large number of Vertical Well and horizontal well combination in the present invention, give vent to anger in a large number, realize the large-scale production of underground coal gasification(UCG).
Some operation characteristics of coal underground gasifying furnace of the present invention are: connect the drilling well that there is no conducting; light coal seam from ignition system; connect the system of giving vent to anger and gas injection system by reverse combustion; then use the coiled tubing retrusive to gas injection system injected gas agent; by the system produce coal gas of giving vent to anger; carry out reverse combustion or retrusive gasification, realize the large-scale production of underground coal gasification(UCG).Vertical drilling well (for example the second vertical drilling well 2-6) in a row is preferably in cracks in coal seam and grows on direction, and (for example the first horizontal directional drilling in embodiment 1-4 a) preferably creeps into against the direction of cracks in coal seam the horizontal directional drilling of igniting row; At the beginning of gasification furnace builds, between the system of giving vent to anger and gas injection system and ignition system, can connect, can not connect yet, in the situation that do not connect, more can protect drilling well not stop up, with ignition system in a distance; Described distance is according to the be heated length estimation of rear cranny development of the channel radius after the reaming of drilling well firepower and coal seam; After every mouthful of drilling completion, Duan Luo hole, coal seam all will be lowered to the boring protective device in time, and protective device can be seamed pipe, can be also seamless pipe, but material can be cast iron, PVC retardant composite material or glass fiber reinforced plastic, preferred seamless glass reinforced plastic pipe; Many horizontal directional drillings (for example many second horizontal directional drillings in embodiment 1-4) gasify simultaneously, preferably adopt retrusive gasification or reverse combustion, the preferred coiled tubing gas injection of retrusive gas injection retrusive, gasification gas drains into ground from the system of giving vent to anger shared; Retreat opportunity according to the significant change judgement coiled tubing of active principle content in coal gas.Obviously, stability when coal underground gasifying furnace of the present invention and coal underground gasification method can improve gasification furnace structure and gasification operation, before not implementing gasification, each drilling well is relatively independent, and support apparatus is all arranged, be difficult for subsiding, retrusive gasification can prevent from having solved because of the contacting of roof collapse blocking-up gasifying agent and coal seam the instability problem that underground gasification furnace structure and gasification move; Further; the present invention has reduced the cost of large-scale production; drilling hole amount on the unit area of coal seam is moderate; build the stove cost lower; recovery ratio and gas yield that multiple row gasifies side by side and can improve coal seam; reduce heat waste, reduce the underground water intrusion risk, solved the difficult problem that underground coal gasification(UCG) is difficult to large-scale production when reducing the Gas Production cost.
" approximately, approximately, the left and right " of while in the present invention, relating to numerical value, using includes given figure.In the present invention, numerical value or quantity are all example rather than restriction, can adjust as the case may be.Coiled tubing used is only example, can be in fact any gasifying agent access tube, as long as its gas injection end pulled and move along with the gasifying agent access tube, can guide in the drilling well with this gasifying agent access tube combustion front to move and get final product.In the present invention, relate to " until ... enter near coal point " refer to: can move along the position towards entering coal point, until the position that expectation stops.
Claims (21)
1. a coal underground gasifying furnace comprises:
Ignition system, there is the first vertical drilling well (1) of passing into coal seam and horizontal segment in coal seam and with first horizontal directional drilling (a) of the first vertical drilling well (1) conducting,
Gas injection system, have the second drilling well that passes into coal seam, with described the first horizontal directional drilling (a) conducting,
It is characterized in that, described the second drilling well is at least one in coal seam of horizontal segment the second horizontal directional drilling (b, c, d, e, f).
2. coal underground gasifying furnace according to claim 1, is characterized in that,
Described the first horizontal directional drilling (a) is with mode and described the second horizontal directional drilling (b, c, d, e, f) conducting of firepower reaming.
3. coal underground gasifying furnace according to claim 1, is characterized in that,
Described the second drilling well is at least two described the second horizontal directional drillings (b, c, d, e, f) parallel to each other, along with the crossing direction of the first horizontal directional drilling (a), being arranged in its one or both sides.
4. coal underground gasifying furnace according to claim 3, is characterized in that,
Described the second horizontal directional drilling (b, c, d, e, f) is the angle of 30 °-90 ° with the first horizontal directional drilling (a).
5. according to the described coal underground gasifying furnace of any one in claim 1-4, it is characterized in that,
Be provided with at least one second vertical drilling well (2,3,4,5,6) along described the first horizontal directional drilling (a),
Wherein, by the firepower reaming of the first horizontal directional drilling (a), all second vertical drilling well (2,3,4,5,6) communicates with each other to form and gas well.
6. coal underground gasifying furnace according to claim 5, is characterized in that,
The horizontal segment end of described the first horizontal directional drilling (a), with firepower perforation or directional blasting or cold conditions pressure break mode and the described first vertical drilling well (1) conducting.
7. coal underground gasifying furnace according to claim 5, is characterized in that,
The horizontal segment end of described the first horizontal directional drilling (a), directly connect with the described first vertical drilling well (1).
8. coal underground gasifying furnace according to claim 1, is characterized in that,
Described the second drilling well is at least two described the second horizontal directional drillings (b, c, d, e, f), is arranged in the same side of the first horizontal directional drilling (a),
One of them second horizontal directional drilling (b, c, d, e, f) points to and connects mode and the described first vertical drilling well (1) conducting with pressure break, be furnished with at least one the 3rd vertical drilling well (2 ' along this second horizontal directional drilling, 3 ', 4 ', 5 ', 6 ', 7 ', 8 ', 9 ', 10 ')
Wherein, this second horizontal directional drilling also forms together and gas well by firepower reaming and the 3rd vertical drilling well (2 ', 3 ', 4 ', 5 ', 6 ', 7 ', 8 ', 9 ', 10 ') conducting.
9. according to claim 1-4, in 6-8, a described coal underground gasifying furnace, is characterized in that,
In all drilling wells, each drilling well be positioned at Zhong Luo hole, coal seam section by the suspension device supporting.
10. coal underground gasifying furnace according to claim 9, is characterized in that,
Described suspension device is screen casing or seamless pipe.
11. coal underground gasifying furnace according to claim 1, is characterized in that,
At least in described second horizontal directional drilling (b, c, d, e, f), be provided with the gasifying agent access tube that can pull, its gas injection end is pulled and is moved with described gasifying agent access tube.
12. a coal underground gasification method, is characterized in that, comprising:
Build the coal underground gasifying furnace step, described coal underground gasifying furnace is the described coal underground gasifying furnace of any one in aforementioned claim 1-11; And
The step gasified in the gasification furnace built, it comprises: guide the burning flame range of the first horizontal directional drilling (a) to retreat in the second horizontal directional drilling (b, c, d, e, f), until retreat near the entering coal point of described the second horizontal directional drilling (b, c, d, e, f).
13. coal underground gasification method according to claim 12, is characterized in that,
The step that builds coal underground gasifying furnace comprises the sub-step 1-2 carried out successively as follows:
Sub-step 1: get out successively sequentially: first horizontal directional drilling (a), at least two the second vertical drilling wells (2,3,4,5,6) of along first horizontal directional drilling (a) arranging of the first vertical drilling well (1), horizontal segment that passes into coal seam in coal seam and be arranged in the first horizontal directional drilling (a) one or both sides and at least two second horizontal directional drillings (b, c, d, e, f) of horizontal segment in coal seam, all these drilling wells that get out cut off each other; And
Sub-step 2, first described the first horizontal directional drilling of conducting (a) and the described first vertical drilling well (1), then at the coal-fired layer of the described first vertical drilling well (1) base point, from the first horizontal directional drilling (a) injected gas agent, guiding burning flame range moves with to described the first horizontal directional drilling firepower reaming, until with described sub-step 1 in all the other all drilling well conductings.
14. coal underground gasification method according to claim 13, is characterized in that,
When described the first horizontal directional drilling (a) is carried out to described firepower reaming, pass into pressure air in described the second horizontal directional drilling (b, c, d, e, f), the pressure of this pressure air is greater than the pressure in described the first horizontal directional drilling (a).
15. coal underground gasification method according to claim 13, is characterized in that,
The described burning flame range of guiding in described sub-step 2 moves, and by pulling in described the first horizontal directional drilling (a) coiled tubing, its gas injection end is moved carry out.
16. coal underground gasification method according to claim 13, is characterized in that,
Against the growth direction of cracks in coal seam, to the first vertical drilling well (1), bore the first horizontal directional drilling (a).
17. coal underground gasification method according to claim 12, is characterized in that,
The step that builds coal underground gasifying furnace comprises the sub-step 1-3 carried out successively as follows:
Sub-step 1: grow direction along cracks in coal seam and get out successively the first vertical drilling well (1) be spaced apart from each other and at least two the second vertical drilling wells (2,3,4,5,6) that pass into coal seam, another mistake cracks in coal seam growth direction and is made a call to the first horizontal directional drilling (a) to the direction of the first vertical drilling well (1), and it connects the first vertical drilling well (1) and a part the second vertical drilling well (2,3,4,5,6) in coal seam;
Sub-step 2: in a side of the first horizontal directional drilling (a), get out at least two the second horizontal directional drillings (b, c, d, e, f) that end points to the first horizontal directional drilling (a), wherein the end of a part of the second horizontal directional drilling (b, d, f) communicates with the first horizontal directional drilling (a), and the end of another part the second horizontal directional drilling (c, e) and the first horizontal directional drilling (a) are in a distance
Sub-step 3: at the first horizontal directional drilling (a), be lowered to coiled tubing, from the gas injection end of coiled tubing to the first horizontal directional drilling (a) injected gas agent, at the coal-fired layer of the first vertical drilling well (1) base point, pull coiled tubing guiding burning flame range and move with to the reaming of described the first horizontal directional drilling (a) firepower, until with described another part the second horizontal directional drilling (c, e) and the vertical drilling well of another part second (2,3,4,5,6) perforation.
18. coal underground gasification method according to claim 17, is characterized in that,
Described sub-step 2 also comprises: in a side of the first horizontal directional drilling (a), make a call to the 4th vertical drilling well (1 ", 2 ", 3 ", 4 ", 5 ") to coal seam, and with the second horizontal directional drilling (b, c, d, e, f), connect correspondingly respectively,
In the process gasified in the gasification furnace built, burning flame range in the second horizontal directional drilling move to the 4th vertical drilling well (1 ", 2 ", 3 ", 4 ", 5 ") lower time, using the 4th vertical drilling well (1 ", 2 ", 3 ", 4 ", 5 ") replace the first vertical drilling well (1), the second vertical drilling well (2,3,4,5,6) and the first horizontal directional drilling (a) as going out gas well.
19. coal underground gasification method according to claim 13, is characterized in that,
When pulling in a part of the second horizontal directional drilling (b, c, d, e, f) that the gasifying agent access tube moves the burning flame range, with another part the second horizontal directional drilling (b, c, d, e, f) for going out gas well,
Wherein, this another part second horizontal directional drilling (b, c, d, e, f) is withdrawn from the gasifying agent access tube as going out under the situation of gas well wherein, and the first horizontal directional drilling (a), the first vertical drilling well (1) and the second vertical drilling well that is provided with are closed.
20. coal underground gasification method according to claim 12, is characterized in that, the step that builds coal underground gasifying furnace comprises:
(I) build gasification furnace ignition system and the system of giving vent to anger, it comprises: get out successively the following drilling well that passes into coal seam: the first horizontal directional drilling (a) in coal seam of the first vertical drilling well (1), orthogonal and horizontal segment and second horizontal directional drilling (b), along the second vertical drilling well (2,3,4,5,6) and the 3rd vertical drilling well (2 ' of arranged crosswise respectively of these two horizontal directional drillings, 3 ', 4 ', 5 ', 6 ', 7 ', 8 ', 9 ', 10 '); Then, these two horizontal directional drillings and the first vertical drilling well (1) pressure break are connected, and the first horizontal directional drilling of firepower reaming afterwards (a) forms ignition system until connect the second vertical drilling well (2,3,4,5,6) along the line, and firepower reaming the second horizontal directional drilling (b) is until connect the 3rd vertical drilling well (2 ' along the line, 3 ', 4 ', 5 ', 6 ', 7 ', 8 ', 9 ', 10 ') form the system of giving vent to anger; And
(II) when building gasification furnace ignition system and the system of giving vent to anger, beat other second horizontal directional drilling (c, d, e, f) parallel with described second horizontal directional drilling (b), its horizontal segment is in coal seam and the horizontal segment end points to the first horizontal directional drilling (a) and by pressed gas pressure break mode and the first horizontal directional drilling (a) perforation.
21. coal underground gasification method according to claim 20, is characterized in that,
Described firepower reaming is embodied as: in the first vertical drilling well (1), light coal seam, pull the gas injection end of coiled tubing in the first horizontal directional drilling (a) and described second horizontal directional drilling (b), guiding burning flame range moves and carries out the firepower reaming along these two horizontal directional drillings.
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| EP14842213.2A EP3043021A1 (en) | 2013-09-04 | 2014-04-03 | Underground coal gasification furnace and underground coal gasification method |
| PCT/CN2014/074721 WO2015032197A1 (en) | 2013-09-04 | 2014-04-03 | Underground coal gasification furnace and underground coal gasification method |
| US14/916,712 US20160194945A1 (en) | 2013-09-04 | 2014-04-03 | Underground coal gasification furnace and underground coal gasification method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103437748B (en) | 2016-08-10 |
| WO2015032197A1 (en) | 2015-03-12 |
| US20160194945A1 (en) | 2016-07-07 |
| EP3043021A1 (en) | 2016-07-13 |
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Effective date of registration: 20170125 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 065001 Langfang City Development Zone of Hebei province Huaxiang Patentee before: ENN Coal Gasification Co., Ltd. |