CN101424181A - Method and system for determining and penetrating underground coal gasification passage - Google Patents
Method and system for determining and penetrating underground coal gasification passage Download PDFInfo
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- CN101424181A CN101424181A CNA2008101789283A CN200810178928A CN101424181A CN 101424181 A CN101424181 A CN 101424181A CN A2008101789283 A CNA2008101789283 A CN A2008101789283A CN 200810178928 A CN200810178928 A CN 200810178928A CN 101424181 A CN101424181 A CN 101424181A
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Abstract
The invention relates to the field of underground coal gasification, in particular to a technology for ensuring and channeling a coal gasification tunnel. The invention provides a method and a system for ensuring and channeling the coal gasification tunnel, wherein the method comprises the following steps: measuring the crustal stress in the horizontal direction of a coal bed; ensuring the cranny developing direction of the coal bed according to the measured crustal stress in the horizontal direction; and ensuring the direction of the coal gasification tunnel according to the cranny developing direction of the coal bed. Because the cranny developing direction in the coal bed is ensured according to the crustal stress in the horizontal direction of the coal bed and the direction of the coal gasification tunnel is decided according to the cranny developing direction of the coal bed, when the coal gasification tunnel exploited along the cranny developing direction of the coal bed reaches the same permeability, the required external force is smaller so that the channeling efficiency of the gasification tunnel is improved.
Description
Technical field
The present invention relates to the underground coal gasification(UCG) field, relate in particular to definite, as to connect coal gasification passage technology.
Background technology
The cleaning of coal is one of key subjects in the energy and environment protection field, the world today with efficient the utilization.At present, domesticly can only account for 11.43% of coal resources reserves by staff's coal that excavates of going into the well, for other coal resources, as abandoned mine or exploit uneconomic brown coal or coal seam, deep etc., then be unsuitable for the dispatch personnel excavation of going into the well, but adopt the method for underground coal gasification(UCG) to exploit, utilize coal resources.
Coal underground gasifying technology requires the coal seam to have higher gas penetrating power.Yet the natural penetrating power in coal seam is very poor, therefore needs to connect among the coal seam earlier gasification tunnel before carrying out underground coal gasification(UCG) (UCG) operation.Gasification tunnel as shown in Figure 1 injects between well and the gas-producing well at gasifying agent, has higher gas permeability, and is current with supplied gas.Gasification tunnel also helps to determine the approach of gasification and the expansion rate of gasification cavity, thereby the injection rate and the gas yield of control gasifying agent make UCG controlled to a certain extent.
Before connecting gasification tunnel, need to determine the gasification tunnel route.At present, judgement for the gasification tunnel route is that several different directions are dug a well respectively around gasifying agent injects well, inject well to gasifying agent afterwards and blast gases at high pressure, observe gasifying agent and inject the amount that well several mouthfuls of wells are on every side discharged gases, select the well of capacity maximum and gasifying agent to inject the line direction of well as the gasification tunnel direction.Utilize this method to need to bore three mouthfuls of wells at least, could roughly determine gasification tunnel, cost is higher; In addition, it is lower that the gasification tunnel that this method is determined connects efficient, through regular meeting occur connecting selection gasification tunnel, need redefine the situation that gasification tunnel connects once more.Therefore, the method cost of determining, connect gasification tunnel of prior art is higher, and perforation efficient is lower.
Summary of the invention
The embodiment of the invention provides a kind of underground coal gasification passage to determine, has connected method and system, is used to improve the perforation efficient of gasification tunnel.
A kind of coal gasification passage is determined method, comprising:
Measure the geostatic stress of coal seam horizontal direction;
According to the geostatic stress of the horizontal direction of measuring, determine described cracks in coal seam growth direction;
Grow the direction that direction is determined described coal gasification passage according to described cracks in coal seam.
The geostatic stress of described measurement coal seam horizontal direction is specially:
Obtain at least one block of rock in the described coal seam in the orientational coring mode;
Measure the geostatic stress of described rock horizontal direction, determine the geostatic stress of described coal seam horizontal direction according to the geostatic stress of described rock horizontal direction.
After the geostatic stress of described measurement coal seam horizontal direction, also comprise:
According to the geostatic stress of the horizontal direction of measuring, determine the length of described coal gasification passage.
A kind of coal gasification passage is determined system, comprising:
Horizontal direction geostress survey device in coal seam is used to measure the geostatic stress of coal seam horizontal direction;
Cracks in coal seam is grown direction and is determined device, is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines described cracks in coal seam growth direction;
The coal gasification passage is determined device, is used for growing the direction that direction is determined described coal gasification passage according to described cracks in coal seam.
A kind of coal gasification passage perforation method comprises:
According to the geostatic stress of the coal seam horizontal direction of measuring, determine the cranny development direction in described coal seam;
Determine the direction of described coal gasification passage according to the cranny development direction in described coal seam;
Determine that according to the direction of described coal gasification passage gas-producing well injects drilling well behind the orientation of well with respect to gasifying agent;
The coal seam of injecting between well and the gas-producing well at described gasifying agent connects the coal gasification passage.
A kind of coal gasification passage connects system, comprising:
Horizontal direction geostress survey device in coal seam is used to measure the geostatic stress of coal seam horizontal direction;
Cracks in coal seam is grown direction and is determined device, is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines described cracks in coal seam growth direction;
The coal gasification passage is determined device, is used for growing the direction that direction is determined described coal gasification passage according to described cracks in coal seam;
Drilling rig is used for determining that according to the direction of described coal gasification passage gas-producing well injects drilling well behind the orientation of well with respect to gasifying agent;
The gasification tunnel pass-through facility is used for connecting the coal gasification passage in the coal seam that described gasifying agent injects between well and the gas-producing well.
The embodiment of the invention is owing to determine the growth direction in crack in the coal seam according to the geostatic stress of coal seam horizontal direction, decide the trend of coal gasification passage according to the growth direction of cracks in coal seam, make coal gasification passage along the growth direction developing of cracks in coal seam when reaching identical permeability, required external force is less, thereby improves the perforation efficient of gasification tunnel; Perhaps apply identical external force, then can increase the length of gasification tunnel, thereby reduce boring investment, saving cost.
Description of drawings
Fig. 1 is that the gasifying agent of prior art injects well, gas-producing well and gasification access diagram;
Fig. 2 is the method flow diagram of determining, connect the coal gasification passage of the embodiment of the invention;
Fig. 3 determines cracks in coal seam for the direction according to coal seam maximum horizontal geostatic stress of the embodiment of the invention and grows the schematic diagram of direction;
Fig. 4 obtains the schematic diagram of the rock in the coal seam for the embodiment of the invention in the orientational coring mode;
Fig. 5 a is the structural representation of system of definite coal gasification passage of the embodiment of the invention;
Fig. 5 b is the structural representation of system of the perforation coal gasification passage of the embodiment of the invention;
Fig. 6 is the structural representation of the coal seam horizontal direction geostress survey device of the embodiment of the invention.
The specific embodiment
The present inventor considers often have the crack among the coal seam, and the crack of natural formation can provide effective infiltration lane.Therefore, the embodiment of the invention utilizes the crack in the coal seam to select, connect the coal gasification passage.Specifically can be the growth direction (being the trend in crack) of determining crack in the coal seam according to the geostatic stress of the coal seam horizontal direction of measuring, decide the trend of coal gasification passage according to the growth direction of cracks in coal seam.Like this, opening up the coal gasification passage along the growth direction of cracks in coal seam can be so that gasification tunnel be when reaching identical permeability, and required external force is less, thereby improves the perforation efficient of gasification tunnel; Perhaps apply identical external force, then can increase the length of gasification tunnel, thereby reduce boring investment, saving cost.
Describe the technical scheme of the embodiment of the invention in detail below in conjunction with accompanying drawing.
A kind of concrete grammar of determining, connecting the coal gasification passage that the embodiment of the invention provides, flow chart comprises following concrete steps as shown in Figure 2:
The geostatic stress of coal seam horizontal direction is determined in S201, measurement.
Because the coal seam is in underground, can't directly judge the trend in its crack, then can be according to architectonic principle---the direction of maximum horizontal geostatic stress is consistent substantially in fracture strike in the stratum and the stratum, thereby measure the geostatic stress of coal seam horizontal direction earlier, and then the direction of definite coal seam maximum horizontal geostatic stress, just can determine cracks in coal seam and grow direction (as shown in Figure 3).
Have multiplely at present for the measuring method of stratum geostatic stress, those skilled in the art can select the method for the most suitable a kind of local coal seam situation to measure the geostatic stress of the horizontal direction in coal seam according to actual conditions.The concrete method of measuring the geostatic stress of coal seam horizontal direction will describe in detail follow-up.
S202, according to the geostatic stress of the horizontal direction of measuring, determine that described cracks in coal seam grows direction.
According to the geostatic stress of the horizontal direction of measuring, determine the direction of maximum horizontal geostatic stress; According to the direction of the maximum horizontal geostatic stress in coal seam, just can determine cracks in coal seam and grow direction.That is to say, be cracks in coal seam along the direction of the maximum horizontal geostatic stress in coal seam and grow direction.
S203, grow the direction that direction is determined the coal gasification passage according to described cracks in coal seam.
After having determined that cracks in coal seam is grown direction, grow the direction of direction as the coal gasification passage with cracks in coal seam.That is to say, grow direction along cracks in coal seam the coal gasification passage is set.
S204, to make that gasifying agent injects well consistent with the direction of the coal gasification passage of determining with line direction between the gas-producing well.
Before connecting the coal gasification passage, need to bore gasifying agent and inject well and gas-producing well.Usually can before definite coal gasification channel direction, bore gasifying agent and inject well, yet, determine the method for coal gasification channel direction according to the embodiment of the invention, both can before definite coal gasification channel direction, also can after definite coal gasification channel direction, bore gasifying agent and inject well.
After having determined the coal gasification channel direction, just can determine that gas-producing well has injected the orientation of well with respect to gasifying agent.Be specially, the line direction of gas-producing well and gasifying agent injection well is consistent with the coal gasification channel direction of determining as far as possible and gets final product.
After having determined that gas-producing well injects the orientation of well with respect to gasifying agent, can implement the drilling well of gas-producing well.The line direction that makes gas-producing well and gasifying agent inject between the well is consistent with the direction of the coal gasification passage of determining as far as possible, thereby just can be, thereby the perforation efficient height of coal gasification passage, more save cost so that the coal gasification passage that gas-producing well and gasifying agent inject between the well is grown direction along cracks in coal seam.
S205, basis are decided the geostatic stress of coal seam horizontal direction, determine the length of coal gasification passage.
In order further to improve the perforation efficient height of coal gasification passage, can also be according to the geostatic stress of coal seam horizontal direction, determine the length of coal gasification passage, thereby determine the drilling well position of gas-producing well more accurately, obtain the perforation efficient of higher coal gasification passage.
For example, considering after all multifactor (such as the effective radius of coal seam thickness, gasification tunnel, the modulus of elasticity of coal, the compression coefficient of coal etc.), can adopt following formula to calculate the length value W of coal gasification passage:
In the following formula, a is for setting constant, and h is the passage face height, and K is the coal seam permeability, K
1Be the country rock permeability, r is the effective radius of coal gasification passage, and H is a coal seam thickness, and T is the perforation time.Wherein permeability K in coal seam can calculate according to difference maximum, the minimum level geostatic stress:
Wherein, K is a permeability, and σ ' is the poor of maximum horizontal geostatic stress and minimum level geostatic stress, and v is the poisson's ratio of coal, and E is the modulus of elasticity of coal, C
fCompression coefficient for coal.
Those skilled in the art also can adopt other formula or adopt statistical method to obtain relation between the geostatic stress of the length value of coal gasification passage and coal seam horizontal direction.
S206, carry out drilling well.
After having determined the coal gasification channel direction, just can determine that gas-producing well has injected the orientation of well with respect to gasifying agent, can implement the drilling well of gas-producing well afterwards.
In order further to improve the perforation efficient of coal gasification passage, can also be in the length of determining the coal gasification passage, after determining gas-producing well and inject the distance of well according to the length of coal gasification passage, implement the drilling well of gas-producing well again with respect to gasifying agent.
S207, the coal seam between gasifying agent injection well and gas-producing well connect the coal gasification passage.
Can adopt several different methods to connect gasifying agent and inject coal gasification passage between well and the gas-producing well, for example include but not limited to: methods such as electric power perforation, fracturing, the infiltration of air firepower, directed drilling.
Electric power perforation method is that the alternating current with industrial frequency is added on the coal seam, fuel factor by electric energy, the physical arrangement in coal seam is destroyed, in two borings, form the coking passage that the narrow quilt with gas permeability burns in the interelectrode coal seam, enlarge the coking passage through hot-working again, thereby connect out gasification tunnel in the coal seam between boring.
Hydrofracturing method is by injecting high-pressure solution in the coal seam, and the high-pressure solution coal seam of flowing through connects out a passage as gasification tunnel in the coal seam between two boring.
To be the natural gas permeability of utilizing the coal seam regard the gasification coal seam nature layer of the coal that coal cinder is formed of being isolated by pore and crack as to air firepower osmosis, under thermodynamic activity, this released state in coal seam will constantly be strengthened, thereby set up gasification tunnel in the coal seam between two boring.
After the cranny development direction is determined the coal gasification passage in according to the coal seam, further set up gasification tunnel by perforation methods such as pressure, waterpower or firepower, further grow in the crack that helps in the coal seam, thereby guarantee that the coal seam has higher gas penetrating power.Help like this in gasification, to improve and conduct heat, mass transfer and response intensity, the efficient and the gas yield of gasification are improved in the crack in reinforcement coal seam.
Above-mentioned steps S201 measures the geostatic stress of coal seam horizontal direction, can adopt accomplished in many ways at present, such as: the method for mining site stress measurements such as fracturing method for measuring stress, the measurement of borehole wall avalanche stress direction, the stress measurement of long space sound wave, ground potential normal stress orientation measurement, down-hole microseism ripple method geodetic stress direction, the releasing of cover cardiac stress;
Perhaps, utilize geology and seismic data, as volcanic neck, fault pattern, oil well hole stability, core recovery, stratum fluctuating, geological structure, focal mechanism etc., carry out the Stress Field Distribution situation that qualitative analysis obtains the coal seam, thereby determine the geostatic stress of described coal seam horizontal direction;
Perhaps, adopt methods such as stress field finite element numerical simulation, profile of geostress explanation, drilling parameter inverting, long spaced acoustilog self adaptation to calculate the geostatic stress of coal seam horizontal direction;
Obtain stratum---the geostatic stress of the horizontal direction in coal seam that to measure again or by the rock core measuring method.Those skilled in the art can choose the geostatic stress that the method that tallies with the actual situation is most measured the horizontal direction in coal seam.
Wherein, preferred methods is the rock core measuring method.Can not need a large amount of site plants and personnel at indoor measurement because rock core is measured, therefore have lower cost.The rock core measuring method mainly is to utilize the Caesar of rock (Kaiser) effect to measure the geostatic stress of the horizontal direction of the rock in the coal seam, because the geostatic stress of rock horizontal direction has reflected the geostatic stress of coal seam horizontal direction, therefore, can determine the geostatic stress of coal seam horizontal direction by the geostatic stress of measuring the horizontal direction of at least one rock in the coal seam.Owing to normally rock is taken out the geostatic stress that its horizontal direction is measured in the back from the coal seam; The geostatic stress that therefore can reflect the horizontal direction in its coal seam, place for the geostatic stress of the horizontal direction of the rock that guarantees to take out the back test, need to guarantee location status after rock takes out be with the coal seam in location status corresponding to.That is to say, in the process of getting rock and test rock, can not overturn, rotate this rock, otherwise the geostatic stress of the horizontal direction of the rock that tests out can not reflect the geostatic stress of the horizontal direction in its coal seam, place.Therefore, the method for employing orientational coring is obtained the rock in the coal seam, can keep rock residing posture (as shown in Figure 4) in the coal seam, and the geostatic stress of the horizontal direction of the feasible rock of measuring can reflect the geostatic stress of the horizontal direction in its coal seam, place.
The Kaiser effect of rock is meant that rock has memory function to the stress of suffered mistake, the maximum that reaches the suffered mistake of rock when extraneous stress in advance during stress rock begin to occur tangible acoustic emission phenomenon.Utilize the Kaiser effect of rock, can increase stress by forcing press step by step to rock in the horizontal direction, the strain-stress relation of record rock, and the acoustic emission frequency of test rock in stress increase process, judge the geostatic stress of rock horizontal direction according to test result, thereby can draw the maximum or minimum stress direction of rock horizontal direction.
Though it will be understood by those skilled in the art that in the above-mentioned explanation, for ease of understanding, the step of method has been adopted the succession description, should be pointed out that for the order of above-mentioned steps and do not do strict the restriction.
The system of a kind of definite coal gasification passage that the embodiment of the invention provides shown in Fig. 5 a, comprising: coal seam horizontal direction geostress survey device 501, cracks in coal seam are grown direction and are determined that device 502, coal gasification passage determine device 503.
Coal seam horizontal direction geostress survey device 501 is used to measure the geostatic stress of coal seam horizontal direction.Concrete measuring method can adopt the measuring method of as above introducing, and repeats no more herein.
Cracks in coal seam is grown direction and is determined that device 502 is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines described cracks in coal seam growth direction.Cracks in coal seam is grown direction and is determined the direction of device 502 according to maximum horizontal geostatic stress in the horizontal direction geostatic stress of described coal seam, judges described cracks in coal seam and grows direction.
The coal gasification passage determines that device 503 is used for growing the direction that direction is determined described coal gasification passage according to described cracks in coal seam.The coal gasification passage determines that the direction of device 503 definite described coal gasification passages is consistent with cracks in coal seam growth direction as far as possible.
Further, the coal gasification passage determines that device 503 also is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines the length of described coal gasification passage.The method of concrete definite coal gasification passage length repeats no more as previously mentioned herein.
A kind of concrete structure of coal seam horizontal direction geostress survey device 501 comprises as shown in Figure 6: rock acquisition module 601, rock stress measurement module flatly 602, coal seam horizontal direction geostatic stress determination module 603.
Rock stress measurement module flatly 602 is used to measure the geostatic stress of described rock horizontal direction;
Coal seam horizontal direction geostatic stress determination module 603 is used for determining according to the geostatic stress of described rock horizontal direction the geostatic stress of described coal seam horizontal direction.
A kind of system that connects the coal gasification passage that the embodiment of the invention provides, shown in Fig. 5 b, comprise that aforesaid coal seam horizontal direction geostress survey device 501, cracks in coal seam grow direction and determine that device 502 and coal gasification passage determine also to comprise outside the device 503: drilling rig 504, gasification tunnel pass-through facility 505.
Wherein, drilling rig 504 is used for determining according to the coal gasification passage direction of the coal gasification passage that device 503 is determined, determines that gas-producing well injects drilling well behind the orientation of well with respect to gasifying agent.
Gasification tunnel pass-through facility 505 is used for connecting the coal gasification passage in the coal seam that described gasifying agent injects between well and the gas-producing well.Concrete perforation method can adopt one of aforementioned perforation method.
Further, drilling rig 504 also is used for before drilling well also determining that according to the coal gasification passage length of the coal gasification passage that device 503 is determined determines that gas-producing well injects the distance of well with respect to gasifying agent; Determining to implement drilling well again after the azimuth-range of gas-producing well with respect to gasifying agent injection well, can be so that the perforation efficient of the coal gasification passage between gas-producing well and the gasifying agent injection well be higher.
The embodiment of the invention is owing to determine the growth direction in crack in the coal seam according to the geostatic stress of coal seam horizontal direction, decide the trend of coal gasification passage according to the growth direction of cracks in coal seam, make coal gasification passage along the growth direction developing of cracks in coal seam when reaching identical permeability, required external force is less, thereby improves the perforation efficient of gasification tunnel; Perhaps apply identical external force, then can increase the length of gasification tunnel, thereby reduce boring investment, saving cost.
After the cranny development direction is determined the coal gasification passage in according to the coal seam, further set up gasification tunnel by perforation methods such as pressure, waterpower or firepower, further grow in the crack that helps in the coal seam, thereby guarantee that the coal seam has higher gas penetrating power.Help like this in gasification, to improve and conduct heat, mass transfer and response intensity, the efficient and the gas yield of gasification are improved in the crack in reinforcement coal seam.
In addition, because the coal seam is in the more shallow stratum, under this geological environment, the maximum horizontal geostatic stress is minimum level geostatic stress and several times of stress vertically, along maximum stress direction developing gasification tunnel, make the gasification tunnel to be subjected to passage stress effect peripherally minimum, reduced gasification tunnel possibility of jamming and creep of rock the degree of injury that caves in to a certain extent the wellhole middle sleeve.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
Will also be appreciated that the apparatus structure shown in accompanying drawing or the embodiment only is schematically, the presentation logic structure.Wherein the module that shows as separating component may or may not be physically to separate, and the parts that show as module may be or may not be physical modules.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1, a kind of coal gasification passage is determined method, it is characterized in that, comprising:
Measure the geostatic stress of coal seam horizontal direction;
According to the geostatic stress of the horizontal direction of measuring, determine described cracks in coal seam growth direction;
Grow the direction that direction is determined described coal gasification passage according to described cracks in coal seam.
2, the method for claim 1 is characterized in that, the geostatic stress of described measurement coal seam horizontal direction is specially:
Obtain at least one block of rock in the described coal seam in the orientational coring mode;
Measure the geostatic stress of described rock horizontal direction, determine the geostatic stress of described coal seam horizontal direction according to the geostatic stress of described rock horizontal direction.
3, method as claimed in claim 1 or 2 is characterized in that, after the geostatic stress of described measurement coal seam horizontal direction, also comprises:
According to the geostatic stress of the horizontal direction of measuring, determine the length of described coal gasification passage.
4, the method for claim 1 is characterized in that, the geostatic stress of described measurement coal seam horizontal direction specifically includes but not limited to:
Adopt fracturing method for measuring stress, borehole wall avalanche stress direction measuring method, long space sound wave method for measuring stress, ground potential normal stress direction measurement method or down-hole microseism wave measurement method to measure the geostatic stress of described coal seam horizontal direction; Perhaps
Utilize geology and seismic data qualitative analysis to obtain the Stress Field Distribution situation in coal seam, thereby determine the geostatic stress of described coal seam horizontal direction; Perhaps
Adopt stress field finite element numerical simulation, profile of geostress explanation, drilling parameter inverting or long spaced acoustilog method to calculate the geostatic stress of described coal seam horizontal direction.
5, a kind of coal gasification passage is determined system, it is characterized in that, comprising:
Horizontal direction geostress survey device in coal seam is used to measure the geostatic stress of coal seam horizontal direction;
Cracks in coal seam is grown direction and is determined device, is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines described cracks in coal seam growth direction;
The coal gasification passage is determined device, is used for growing the direction that direction is determined described coal gasification passage according to described cracks in coal seam.
6, system as claimed in claim 5 is characterized in that, described coal seam horizontal direction geostress survey device comprises:
The rock acquisition module is used for obtaining at least one block of rock in described coal seam in the orientational coring mode;
Rock stress measurement module flatly is used to measure the geostatic stress of described rock horizontal direction;
Coal seam horizontal direction geostatic stress determination module is used for determining according to the geostatic stress of described rock horizontal direction the geostatic stress of described coal seam horizontal direction.
7, system as claimed in claim 5 is characterized in that,
Described coal gasification passage determines that device also is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines the length of described coal gasification passage.
8, a kind of coal gasification passage perforation method is characterized in that, comprising:
According to the geostatic stress of the coal seam horizontal direction of measuring, determine the cranny development direction in described coal seam;
Determine the direction of described coal gasification passage according to the cranny development direction in described coal seam;
Determine that according to the direction of described coal gasification passage gas-producing well injects drilling well behind the orientation of well with respect to gasifying agent;
The coal seam of injecting between well and the gas-producing well at described gasifying agent connects the coal gasification passage.
9, method as claimed in claim 8 is characterized in that, before described drilling well, also comprises:
According to the geostatic stress of the coal seam horizontal direction of measuring, determine the length of described coal gasification passage;
According to the length of described coal gasification passage, determine that described gas-producing well injects the distance of well with respect to gasifying agent.
10, method as claimed in claim 8 is characterized in that, described perforation coal gasification passage specifically includes but not limited to:
Adopt the method for the infiltration of air firepower, electric power perforation, fracturing or directional drilling to connect described coal gasification passage.
11, a kind of coal gasification passage connects system, it is characterized in that, comprising:
Horizontal direction geostress survey device in coal seam is used to measure the geostatic stress of coal seam horizontal direction;
Cracks in coal seam is grown direction and is determined device, is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines described cracks in coal seam growth direction;
The coal gasification passage is determined device, is used for growing the direction that direction is determined described coal gasification passage according to described cracks in coal seam;
Drilling rig is used for determining that according to the direction of described coal gasification passage gas-producing well injects drilling well behind the orientation of well with respect to gasifying agent;
The gasification tunnel pass-through facility is used for connecting the coal gasification passage in the coal seam that described gasifying agent injects between well and the gas-producing well.
12, system as claimed in claim 11 is characterized in that,
Described coal gasification passage determines that device also is used for the geostatic stress according to the horizontal direction of described coal seam horizontal direction geostress survey measurement device, determines the length of described coal gasification passage; And
Described drilling rig also is used for before drilling well also determining that according to described coal gasification passage the length of the coal gasification passage that device is determined determines that gas-producing well injects the distance of well with respect to gasifying agent.
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