CN104564009B - Underground gasification method - Google Patents
Underground gasification method Download PDFInfo
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- CN104564009B CN104564009B CN201410781204.3A CN201410781204A CN104564009B CN 104564009 B CN104564009 B CN 104564009B CN 201410781204 A CN201410781204 A CN 201410781204A CN 104564009 B CN104564009 B CN 104564009B
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- 238000002309 gasification Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 309
- 239000003034 coal gas Substances 0.000 claims abstract description 99
- 238000002485 combustion reaction Methods 0.000 claims description 62
- 238000013461 design Methods 0.000 claims description 14
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 7
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 239000003245 coal Substances 0.000 description 22
- 239000007789 gas Substances 0.000 description 14
- 238000000197 pyrolysis Methods 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 229910052704 radon Inorganic materials 0.000 description 5
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 125000001967 indiganyl group Chemical group [H][In]([H])[*] 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Mining & Mineral Resources (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
The present invention relates to a kind of underground gasification method.The underground gasification method, during the underground gasification furnace including at least three drilling wells carries out underground gasification, comprises the following steps：Step 1, in the drilling well of all airflow downstreams positioned at current inlet well, determines a drilling well for being obtained in that active principle content highest coal gas；Step 2, judges whether determined drilling well is current outlet well, if then return to step 1, if not then performing following steps 3；Step 3, replaces current outlet well as outlet well using the drilling well determined, is then current outlet well return to step 1 with the drilling well determined.The underground gasification method can effectively obtain the coal gas with active principle content higher, it is also possible to reduce leak rate and reduction underground gasification hot loss of energy of the coal gas in flow process in gasification tunnel.
Description
Technical field
The present invention relates to underground coal gasification(UCG) field, more particularly to a kind of underground gasification method.
Background technology
In the design of underground coal gasification furnace, in order to reduce drilling cost and large-scale production coal gas, it will usually adopt
Gasification tunnel is built in coal seam with orientation horizontal drilling, a small amount of vertical drilling well is connected and is built underground gasification furnace, concentration uses one
Straightened portion drilling well is used as outlet well.The underground gasification of such as Carbon Energy companies of Australia is two parallel to be determined
To drilling well, coal seam part is long 150 meters, level interval be 30 meters, the end of directed drilling is connected with a vertical drilling well, from erect
Straight borehole bottom lights coal seam, and used as inlet well, a directed drilling carries out two-way retrogressing to a directed drilling as venthole
Formula underground gasification produces coal gas.The coal underground gasifying furnace of patent 201310398563.6 and coal underground gasification method, use
The underground gasification furnace that a plurality of orientation horizontal drilling and vertical drilling well build, with directed drilling as inlet well, middle multiple is vertically
Drilling well is outlet well, direction gasification of being spudded in from outlet well bottom to directed drilling ground.
The operation of these gasification furnaces does not all account for that component also is occurring while coal gas is conveyed in gasification tunnel
Change, coal gas can cause a large amount of gas loss, the heat that coal gas is carried to be dissipated in coal in subterranean coal by long distance delivery
Cause thermal waste also than more serious in layer.Especially through area of combustion centre (the part oxygen that main generation is burnt with carbon herein
Change reaction) later air-flow in gasification tunnel while migrating, while the change in component can occur, this is coal gasification, coal gas
The coefficient result of complex reaction such as conversion and pyrolysis of coal.
To sum up, due to not considering that coal gas flows in gasification tunnel middle and long distance in existing underground gasification furnace operation operation, and
Reduce the active principle content in obtained coal gas, and the leak rate with larger coal gas and energy loss.
The content of the invention
For deficiency of the prior art, it is an object of the invention to provide a kind of ground for improving coal gas active principle content
Lower gasification process.
The present invention provides a kind of underground gasification method, and underground is carried out in the underground gasification furnace including at least three drilling wells
During gasification, comprise the following steps：Step 1, in the drilling well of all airflow downstreams positioned at current inlet well, determines
It is obtained in that a drilling well of active principle content highest coal gas；Step 2, judges whether determined drilling well is currently to go out
Gas well, if then return to step 1, if not then performing following steps 3；Step 3, current outlet is replaced with the drilling well determined
Well, as outlet well, is then current outlet well return to step 1 with the drilling well determined.
According to the present invention, it is following steps a that step 1 is performed：Detect the brill of all airflow downstreams positioned at current inlet well
The active principle content of the coal gas discharged in well, and the active principle content highest drilling well of the coal gas that will be discharged is defined as energy
Enough obtain a drilling well of active principle content highest coal gas.
According to the present invention, it is following steps b that step 1 is performed：Determine the position and border of combustion zone, and detect all being located at
Temperature at the shaft bottom of the drilling well of the airflow downstream of current inlet well；Temperature at all shaft bottoms is located at design temperature interval
It is interior and in the drilling well of the airflow downstream of combustion zone near a drilling well of combustion zone, be defined as being obtained in that effective group
Divide a drilling well of content highest coal gas.
According to the present invention, it is following steps c that step 1 is performed：Determine the position and border of combustion zone；All distances are burnt
The border in area is in setpoint distance is interval and in the drilling well of the airflow downstream of combustion zone near a brill of combustion zone
Well, is defined as being obtained in that a drilling well of active principle content highest coal gas.
According to the present invention, before step 1 is performed, it is following steps a to judge that can step 1 perform, if can if perform step
Rapid a, if can not if to judge that can step 1 perform be following steps b, if can if perform step b, if can not if perform following steps
c；Step a：The active principle content of the coal gas discharged in the drilling well of all airflow downstreams positioned at current inlet well is detected, and will
The active principle content highest drilling well of the coal gas discharged is defined as being obtained in that the one of active principle content highest coal gas
Individual drilling well；Step b：Determine the position and border of combustion zone, and detect the drilling well of all airflow downstreams positioned at current inlet well
Shaft bottom at temperature；By the temperature at all shaft bottoms be located at design temperature it is interval in and positioned at the airflow downstream of combustion zone
Near a drilling well of combustion zone in drilling well, it is defined as being obtained in that a drilling well of active principle content highest coal gas；
Step c：Determine the position and border of combustion zone；By all borders apart from combustion zone in setpoint distance is interval and positioned at combustion
Near a drilling well of combustion zone in the drilling well of the airflow downstream for burning area, it is defined as being obtained in that active principle content highest
One drilling well of coal gas.
According to the present invention, in the case where step 1 is performed as step a, active principle content is CO and H2Volume basis
Than sum or CO, H2And CH4Percent by volume sum.
According to the present invention, in the case where step 1 is performed as step b, active principle content is CO and H2Volume basis
Than sum, and it is 450 DEG C -550 DEG C that design temperature is interval；Or active principle content is CO, H2And CH4Percent by volume it
And when, and it is 350 DEG C -450 DEG C that design temperature is interval.
According to the present invention, in the case where step 1 is performed as step c, active principle content is CO and H2Volume basis
Than sum, and it is 50-100 meters that setpoint distance is interval；Or active principle content is CO, H2And CH4Percent by volume sum,
And it is 100-150 meters that setpoint distance is interval.
According to the present invention, combustion zone is region of the temperature more than 800 DEG C.
Compared to prior art, the beneficial effects of the present invention are：
Underground gasification method of the invention, underground gasification is carried out in the underground gasification furnace including at least three drilling wells
During, step 1 is first carried out, i.e., in the drilling well of all airflow downstreams positioned at current inlet well, determine and be obtained in that
One drilling well of active principle content highest coal gas.Then judge whether determined drilling well is current outlet well, if institute
The drilling well determined is current outlet well then return to step 1, to be determined if the drilling well determined is not current outlet well
The drilling well for going out replaces current outlet well as outlet well, is then current outlet well return to step 1 with the drilling well determined.By
This, with the operation of underground gasification furnace, being obtained in that active principle in the drilling well positioned at the airflow downstream of current inlet well
Content highest coal gas is according to determination outlet well such that it is able to effectively obtain the coal gas with active principle content higher,
It is also possible to reduce leak rate and reduction underground gasification hot loss of energy of the coal gas in flow process in gasification tunnel.
Brief description of the drawings
Fig. 1 shows flow chart of the invention；
Fig. 2 shows the schematic diagram that one embodiment of underground gasification method of the invention is used for underground gasification furnace；
Fig. 3 shows signal when second embodiment of underground gasification method of the invention to be used for underground gasification furnace
Figure, wherein illustrating the structure of the underground gasification furnace at the first moment；
Fig. 4 shows the structure for being underground gasification furnace in Fig. 3 at the second moment.
Specific embodiment
Below referring to Description of Drawings specific embodiment of the invention.
Reference picture 1, one embodiment of underground gasification method of the invention, in the underground gasification including at least three drilling wells
During stove carries out underground gasification, comprise the following steps：Step 1, in all airflow downstreams positioned at current inlet well
Drilling well in, determine a drilling well for being obtained in that active principle content highest coal gas；Step 2, what judgement was determined
Whether drilling well is current outlet well, if then return to step 1, if not then performing following steps 3；Step 3, with what is determined
Drilling well replaces current outlet well as outlet well, is then current outlet well return to step 1 with the drilling well determined.Wherein,
" active principle content highest " refers to：The active principle of the coal gas of the drilling well discharge of all airflow downstreams positioned at current inlet well
Highest one in content.It is above-mentioned " currently to go out and above-mentioned " current inlet well " is to perform the inlet well being currently in use during step 1
Gas well " is to perform the outlet well being currently in use during step 1.
Thus, with the operation of underground gasification furnace, can obtain in the drilling well positioned at the airflow downstream of current inlet well
It is according to determination outlet well to obtain active principle content highest coal gas such that it is able to effectively obtains and contains with active principle higher
The coal gas of amount, it is also possible to reduce leak rate and reduction underground gasification of the coal gas in flow process in gasification tunnel 11
Hot loss of energy.
With continued reference to Fig. 1 and Fig. 2, in the present embodiment, specifically, underground gasification furnace includes 5 drilling wells, respectively vertically
Drilling well 1,2,3,4 and directed drilling 9.Wherein, 1,2,3,4 horizontal segment with directed drilling 9 of vertical drilling well is connected, directed drilling
9 horizontal segment forms the gasification tunnel 11 in coal seam 12.Additionally, vertically drilling well 1, equidistantly arrange between 2,3,4,
In the present embodiment, the horizontal range in vertical drilling well 1,2,3,4 between two neighboring drilling well is equal to 70 meters.
First, arbitrarily two drilling wells of selection at least three drilling wells in underground gasification furnace, by selected two brills
Well is respectively as current inlet well and current outlet well.In the present embodiment, selection directed drilling 9 injects as current inlet well
Gasifying agent, gasifying agent is in gasification tunnel 11 (i.e. the horizontal segment of directed drilling 9) along the side of the vertical section away from directed drilling 9
To flowing.Vertical drilling well 1 is selected as current outlet well, and a vertical drilling well between vertical drilling well 1 and directed drilling 9
Bottom priming, with the injection of gasifying agent, form the combustion zone centered on the vertical drilling well, thus proceed by underground gas
Change.The system of selection of above-mentioned current inlet well, current outlet well and ignition location, is that those skilled in the art are known.That is,
It is current inlet well with one of them after two drilling wells are selected at least three drilling wells, another is current outlet well, that
Ignition location is necessarily located between current inlet well and current outlet well and underground gasification can be formed after.
In underground gasification process, first in the drilling well of all airflow downstreams positioned at current inlet well, energy is determined
Enough obtain a drilling well (i.e. step 1) of active principle content highest coal gas.Wherein, " airflow downstream " is logical along gasification
The direction of the gas flowing in road 11 is located at downstream.It is understood that in underground gasification, gasifying agent is flowed in gasification tunnel 11
Combustion zone simultaneously enters combustion zone, and the coal gas generated in combustion zone leaves combustion zone and current outlet is flowed in gasification tunnel 11
Well, should during, flow into gasifying agent before deserving in gasification tunnel 11 between inlet well and the current outlet well with then by
The coal gas that the burning that the gasifying agent is participated in is obtained forms said flow in gasification tunnel 11.In the present embodiment, bore vertically
Well 1,2,3,4 is respectively positioned on its lower section along airflow direction relative to directed drilling 9, i.e., vertical drilling well 1,2,3,4 is and is located at
The drilling well of the airflow downstream of current inlet well.Additionally, in the present embodiment, with CO and H2It is the active principle in coal gas, with CO
And H2Percent by volume sum be active principle content.Therefore following step is intended to obtain and has CO and H higher2Volume hundred
Divide the coal gas than sum (active principle content i.e. higher).
In order to determine an above-mentioned drilling well for being obtained in that active principle content highest coal gas, step 1 can be performed
For following three step, (one of step a, step b, step c) will be described respectively as follows.
Step a：Detect that the active principle of the coal gas discharged in the drilling well of all airflow downstreams positioned at current inlet well contains
Measure, and the active principle content highest drilling well of the coal gas that will be discharged is defined as being obtained in that active principle content highest coal
One drilling well of gas.
Step b：Determine the position and border of combustion zone, and detect the drilling well of all airflow downstreams positioned at current inlet well
Shaft bottom at temperature, then by the temperature at all shaft bottoms be located at design temperature it is interval in and under the air-flow of combustion zone
A drilling well in the drilling well of trip near combustion zone is defined as being obtained in that a brill of active principle content highest coal gas
Well.
Step c：The position and border of combustion zone are determined by the ground Radon measurement in gasification zone or electromagnetic surveying technology, so
Afterwards by all borders apart from combustion zone in setpoint distance is interval and in the drilling well of the airflow downstream of combustion zone near
One drilling well of combustion zone is defined as being obtained in that a drilling well of active principle content highest coal gas.
In the present embodiment, before step 1 is performed, i.e., active principle content highest coal gas is obtained in that determining
A drilling well before, it is necessary to judge to perform step 1 as which in above-mentioned steps a, step b, step c.Specifically, sentence
Disconnected step is as follows：
First, it is determined that it is above-mentioned steps a that can step 1 perform.
Needed in step a detect all airflow downstreams positioned at current inlet well drilling well in discharge coal gas it is effective
Constituent content.And just because of needing to detect each drilling well that can discharge coal gas, so can exist for example as follows
Problem：Drilling well number is excessive, each drilling well is performed collection coal gas and detection coal gas active principle content high cost or
Inconvenience can not realize the operation.In specific to actual condition, not all drilling well is used simultaneously, in order to it is cost-effective and/
Or simplify ground installation, blind plate sealing is used in drilling well when not in use, and the admission line or outlet pipe on ground are connected when in use,
This kind of situation, in order to collect coal gas rather than dead gas, lasting deflation is needed to detection gas composition, and this will result in wave
Take.It is thereby possible to the operating mode for occurring is and not all drilling well has coal gas to discharge at any time.Or, even all of drilling well has
Coal gas is discharged, but also may require that substantial amounts of equipment and personnel carry out detection operation, it is understood that there may be not enough personnel set
It is standby, or so running cost it is too high.Certainly, according to actual condition, also condition may not can performs step a or hold in the presence of other
Row step a can bring high cost and amount of labour ground problem.Therefore, those skilled in the art, according to real operating mode, can determine
Can step 1 be performed be above-mentioned steps a.If it is above-mentioned steps a that can perform step 1, step a is performed with real currently all
A brill for being obtained in that active principle content highest coal gas is determined in the drilling well of the airflow downstream of current inlet well
Well.If it is above-mentioned steps a that can not perform step 1, it is above-mentioned steps b to judge that can step 1 perform.
Specifically, at due to the shaft bottom of the drilling well for needing to detect all airflow downstreams positioned at current inlet well in step b
Temperature, and due to the limitation in execute-in-place, for example：Temperature testing equipment is installed not at the shaft bottom of all drilling wells,
Or downhole temperature testing equipment is because of such as mal-condition (high temperature, high pressure are generally less than the corrosion of 4MPa, non-purified coal gas)
Damage, or at the shaft bottom of the drilling well that cannot be detected to needs at any time in the case of thermometric, can cause without execution step b
Condition or execution step b can cause high cost or operation inconvenience.In the case, it is impossible to which it is above-mentioned steps to perform step 1
b.Therefore those skilled in the art, according to real operating mode, can determine that can perform step 1 be above-mentioned steps b.If can be by step
Rapid 1 execution is above-mentioned steps b, then perform step b, if it is above-mentioned steps b that can not perform step 1, performs above-mentioned steps c.
In step c, the position of combustion zone is typically determined by the ground Radon measurement in gasification zone or electromagnetic surveying technology
Put and border.And those skilled in the art know ground Radon measurement or electromagnetic surveying technology.
To sum up, according to actual condition, those skilled in the art can easily judge use above-mentioned steps a, step b and
Which in step c.
By taking the underground gasification furnace shown in the present embodiment as an example, in the case where judging that above-mentioned steps a can be performed, hold
Row step a.
Specifically, the coal gas discharged in vertical drilling well 1,2,3,4 is gathered, CO therein and H is detected2Percent by volume
Sum (i.e. active principle content).Testing result is：Vertical drilling well 2, vertical drilling well 1, vertical drilling well 3 and institute in vertical drilling well 4
Active principle content in the coal gas of discharge is sequentially reduced.Thus, vertical drilling well 2 discharge coal gas active principle content most
Height, therefore vertical drilling well 2 is defined as being obtained in that a drilling well of active principle content highest coal gas.Wherein, gathering non-
During coal gas in the drilling well of current outlet well, low discharge outlet to be gathered again after for a period of time, it is to avoid to get dead gas or stagnant for a long time
Stay the real component that gas can not reflect at the shaft bottom of the drilling well.
Afterwards, following steps 2 are performed, that is, judges whether the drilling well determined in step 1 is current outlet well.In this reality
Apply in example, current outlet well now is vertical drilling well 1, and the drilling well determined in step 1 (is obtained in that active principle contains
Measure a drilling well of highest coal gas) it is vertical drilling well 2, therefore the drilling well determined in step 1 is not current outlet well, then
Perform step 3.
Step 3 is that the drilling well to be determined replaces current outlet well as outlet well, the then drilling well to be determined
It is current outlet well return to step 1.In the present embodiment specifically, replacing vertical drilling well 1 as outlet well using vertical drilling well 2,
Even if the coal gas flowed in obtaining gasification tunnel 11 stops being discharged from vertical drilling well 1, and is discharged from vertical drilling well 2.Now erect
Straight drilling well 2 for current outlet well and with this return to step 1, i.e., after return to step 1, it is involved in step 1 " when
Preceding outlet well " is vertical drilling well 2.
And hypothesis judges that the drilling well determined in step 1 is current outlet well in step 2 above, i.e., in step 1
The drilling well determined is vertical drilling well 1, then return to step 1.Now, " current outlet well " involved in step 1 is still
Vertical drilling well 1.
To sum up, judge in step 2 current outlet well (for discharging the outlet well of coal gas when judging) whether be can
A drilling well of active principle content highest coal gas is obtained, if then keeping constant, if not then stopping using current outlet
Well is discharged coal gas and discharges coal gas using a drilling well for being obtained in that active principle content highest coal gas.It is understood that inciting somebody to action
Step 1 is performed during for step a, intuitively can be reflected from which by detecting the active principle content of the coal gas discharged in drilling well
One drilling well can obtain active principle content highest coal gas.
Unceasingly, after return to step 1, in the present embodiment as after return to step a, continue to detect vertical drilling well 1,2,
3rd, the active principle content in the coal gas of 4 discharges.After a certain time, testing result is：It is vertical drilling well 3, vertical drilling well 2, perpendicular
The active principle content in coal gas discharged in straight drilling well 4 and vertically drilling well 1 is sequentially reduced, therefore is determined to obtain effective
One drilling well of constituent content highest coal gas is vertical drilling well 3.
Step 2 is performed, vertical drilling well 3 determined by step 1 and non-present outlet well (i.e. vertical drilling well 2) is judged, therefore
Vertical drilling well 3 is replaced vertical drilling well 2 as outlet well, and with vertical drilling well 3 for current outlet well return to step 1.
Wherein, after return to step 1, can immediately begin to start to determine drilling well again after determining drilling well, or certain interval of time.
Step 1 is performed during for step a, can as immediately begin to detect the active principle content of coal gas, or first certain interval of time
Start the active principle content of detection coal gas again afterwards.And pass through return to step 1, either immediately begin to determine drilling well, or
Every starting to determine drilling well again after a period of time, can at any time or regularly determine and be obtained in that active principle content highest at that time
Coal gas drilling well.
By taking the underground gasification furnace in the present embodiment as an example, judging that step 1 can not perform as step a and judge immediately
In the case that step 1 can be performed as step b, step b is performed.
Specifically, the position and border of combustion zone are determined by shaft bottom thermometric (for example, the temperature measuring equipment for passing through shaft bottom), and
Using thermocouple etc. all airflow downstreams positioned at current inlet well are detected well known to a person skilled in the art equipment or method
Temperature at the shaft bottom of drilling well.In the present embodiment, testing result is：Temperature at the shaft bottom of vertical drilling well 4 is 470 DEG C, is erected
Temperature at the shaft bottom of straight drilling well 3 is 1100 DEG C, and the temperature at the shaft bottom of vertical drilling well 2 is 750 DEG C, the shaft bottom of vertical drilling well 1
The temperature at place is 470 DEG C.Additionally, in the present embodiment, with region of the temperature more than 800 DEG C as combustion zone.It is i.e. logical in gasification
In road 11, temperature limits the border of combustion zone positioned at more than 800 DEG C of zone boundary.
Thus, the temperature at temperature at the shaft bottom of vertical drilling well 1 and the shaft bottom of vertical drilling well 4 is located at 450 DEG C -550 DEG C
Design temperature it is interval in.And the temperature at the shaft bottom of drilling well 3 is higher than 800 DEG C vertically, therefore it is vertically to be located at the shaft bottom of drilling well 3
In combustion zone, therefore combustion zone (border is not shown) is located at below vertical drilling well 3, and thus, vertical drilling well 1 is located at
The airflow downstream of combustion zone.Now, vertical drilling well 1 is defined as being obtained in that a brill of active principle content highest coal gas
Well.
Step 2 is performed afterwards, judges that the i.e. current outlet well of vertical drilling well 1 (is with vertical drilling well 1 during beginning underground gasification
Current outlet well), therefore return to step 1, in referred to herein as return to step b.
Through after a period of time, detecting following result：Temperature at the shaft bottom of vertical drilling well 4 is 1000 DEG C, is bored vertically
Temperature at the shaft bottom of well 3 is 900 DEG C, and the temperature at the shaft bottom of vertical drilling well 2 is 550 DEG C, the temperature at the shaft bottom of vertical drilling well 1
Spend is 400 DEG C.Now, the temperature at the shaft bottom of vertical drilling well 2 is located in 450 DEG C -550 DEG C of design temperature interval.And burn
Area is located at the lower section of vertical drilling well 3 and vertical drilling well 4, therefore drilling well 2 is the airflow downstream for being located at combustion zone vertically, thus, will
Vertical drilling well 2 is defined as being obtained in that a drilling well of active principle content highest coal gas.
Step 2 is then performed, judges that vertical drilling well 2 is not current outlet well (i.e. vertical drilling well 1), therefore by vertical drilling well
2 replace vertical drilling well 1 as outlet well, are then current outlet well return to step 1 (performing step 3) with vertical drilling well 2.
To sum up, first, the position of the outlet well of underground gasification furnace must be located at the airflow downstream of combustion zone, therefore above-mentioned can obtain
A drilling well for obtaining active principle content highest coal gas must be the airflow downstream for being located at combustion zone.Secondly, through burning
The later air-flow in center (the main partial oxidation reaction that burning and carbon occur herein) in gasification tunnel while migrate, on one side
Change in component can occur, because the CO in high-temperature area (more than 600 DEG C) air-flow2And H2O (g) sends out with red-hot carbon
Raw reduction reaction generation CO and H2Deng because reduction reaction is the endothermic reaction so that coal seam and gas flow temperature reduction, when temperature drop
It is low that reduction reaction just no longer there occurs to a certain extent, but air-flow still have temperature higher downstream coal seam is carried out destructive distillation do
It is dry, coal output layer pyrolysis gas are discharged, while producing methanation reaction.The mainly water vapour that the pyrolysis of coal was separated out before 350 DEG C
And CO2, the CH between 350~600 DEG C4Pyrolysis amount of precipitation it is bigger, maximum appears in 500 DEG C or so；And CO and H2In low temperature
Also there is a small amount of precipitation in region, but is concentrated mainly on more than 600 DEG C and CO and H just occur2Maximum precipitation rate.Therefore at 350 DEG C
Following destructive distillation dryer section, can separate out CO because of coal seam2Make CH in air-flow with water vapour4Content reduction, in combustion zone airflow downstream
Gasification tunnel in, temperature be located at 550~450 DEG C between when coal gas in CO and H2Content sum is maximum, and 450~350
CO, H when between DEG C in coal gas2And CH4Content sum is maximum, and this is that the complex reactions such as coal gasification, gas conversion and pyrolysis of coal are total to
The result of same-action.Thus, temperature is located at 450 DEG C -550 DEG C of drilling well at selection shaft bottom, compared to the drilling well of other positions, obtains
CO and H in the coal gas for obtaining2Percent by volume sum highest.By taking the underground gasification furnace in the present embodiment as an example, judging
In the case that step 1 can not be performed as step a and judge that step 1 can not be performed as step b immediately, step c is performed.
Specifically, using survey radon or electromagnetic surveying etc. well known to a person skilled in the art method determine combustion zone position and
Border, then by all borders apart from combustion zone in 50-100 meters of setpoint distance interval and positioned at the air-flow of combustion zone
A drilling well in the drilling well in downstream near combustion zone is defined as being obtained in that of active principle content highest coal gas
Drilling well.During being flowed in the destructive distillation dryer section of the coal gas that is flowed out from combustion zone below 600 DEG C, CO and H2Volume
Percentage sum can be reduced, and in the region CO and H higher than 600 DEG C2With maximum precipitation rate, according to survey radon or electromagnetic surveying
The real-time combustion zone situation temperature field for obtaining understands that position and the temperature formation apart from combustion zone are contacted, therefore, by temperature
Degree, such as 550~450 DEG C of restriction, it is believed that, the coal gas that drilling of the border in 50-100 meters apart from combustion zone is obtained,
Compared to other drillings, CO therein and H2Percent by volume sum highest.
It is understood that above-mentioned steps 1 can begin at any stage that underground gasification furnace is gasified, for example, under as described above
Gasification furnace just starts to perform step 1 after proceeding by underground gasification, or after underground gasification has been carried out a period of time again
Start to perform step 1.And step 1 can also end at any stage of underground gasification, for example, can not perform and be simultaneously in step 1
When step a, step b and step c, or underground gasification is when terminate, or cannot in step a, step b, step c
When finding the drilling well for meeting condition.
Reference picture 3 and Fig. 4, the embodiment phase in another embodiment of underground gasification method of the invention, with above-mentioned Fig. 1
Repeated no more with part.
In the present embodiment, two underground gasification furnaces are included, wherein, a underground gasification furnace includes directed drilling 9 and 4
Individual vertical drilling well (vertical drilling well 1,2,3,4).Vertical 1,2,3,4 horizontal segment respectively with directed drilling 9 of drilling well is connected, Directional Drilling
The horizontal segment of well 9 forms gasification tunnel 11.Vertical drilling well 1,2,3,4 is equally spaced, and the phase in drilling well 1,2,3,4 vertically
Horizontal range between adjacent two drilling wells is equal to 60 meters.
Directed drilling 10 and 4 vertical drilling wells (vertical drilling well 5,6,7,8) are shown in Fig. 3 and Fig. 4.Wherein, bore vertically
5,6,7,8 horizontal segment respectively with directed drilling 10 of well is connected.It is straight that the axis of the horizontal segment of directed drilling 9,10 is located at same
On line, but the horizontal segment of directed drilling 9,10 is not connected.
In the underground gasification furnace completion underground gas that directed drilling 9 and 4 vertical drilling wells (vertical drilling well 1,2,3,4) are constituted
After change or during underground gasification is carried out, thus the horizontal segment connection of directed drilling 9,10 constitutes one by Directional Drilling
The new underground gasification furnace of vertical drilling well (vertical drilling well 1,2,3,4,5,6, the 7,8) composition of 9,10 and 8, well.And directed drilling
9th, 10 horizontal segment collectively forms gasification tunnel 11, it is appreciated that now the horizontal segment of directed drilling 9 may be all or part of
To both sides widen.
After the connection of directed drilling 9,10, when combustion zone is located between vertical drilling well 5 and vertically drilling well 3, to bore vertically
In well 6,7,8 and directed drilling 10 any one as current inlet well to conveying gasifying agent in gasification tunnel 11, and with vertical
Any one vertical drilling well starts (perpendicular to 9,10 and 8 vertical drilling wells of directed drilling as current outlet well in drilling well 1,2,3
Straight drilling well 1,2,3,4,5,6,7,8) underground gasification furnace of composition carry out underground gasification.With CO, H2、CH4Be active principle, with CO,
H2And CH4Percent by volume sum be active principle content.
So that vertical drilling well 6 is current inlet well, vertical drilling well 3 is current outlet well as an example, and be can perform with step 1 is step
As a example by rapid a.
Detect the vertical drilling well 5 of the airflow downstream of vertical drilling well 6, directed drilling 9, vertical drilling well 4, vertical drilling well 3, vertically
Drilling well 2, vertical drilling well 1 discharge coal gas component, as a result for：Vertical drilling well 3, vertical drilling well 4, directed drilling 9, vertical drilling well
2nd, the active principle content of the coal gas that vertical drilling well 1, vertical drilling well 5 are discharged is reduced successively.Therefore drilling well 3 is to be obtained in that vertically
One drilling well of active principle content highest coal gas.
Then, step b is performed, judges that vertical drilling well 3 is current outlet well, therefore return to step 1.
After gasifying after a while, detect：Vertical drilling well 4, directed drilling 9, vertical drilling well 3, vertical drilling well
2nd, the active principle content of the coal gas that vertical drilling well 1 and vertical drilling well 5 are discharged is reduced successively.Therefore with vertical drilling well 4 for can
Obtain a drilling well of active principle content highest coal gas.
Then step b is performed, vertical drilling well 4 and non-present outlet well (vertical drilling well 3) is judged, therefore by vertical drilling well 4
Instead of vertical drilling well 3 as outlet well.Then, with vertical drilling well 4 for current outlet well return to step 1.
And if be step b step 1 is performed, with CO, H2And CH4Percent by volume sum contain for active principle
During amount, it is 350 DEG C -450 DEG C that design temperature is interval.It is understood that due at a temperature of 350 DEG C -600 DEG C, CH4Pyrolysis separate out
Amount is maximum at 500 DEG C or so than larger, and below 350 DEG C, CH4Content can because coal seam 12 separate out CO2Make with vapor
Obtain CH4Content reduction.The temperature of Gu Jingdichu is that 350 DEG C -450 DEG C of drilling well is obtained in that CO, H2And CH4Volume basis
It is higher compared to other drilling wells than sum.And if be step c step 1 is performed, with CO, H2And CH4Volume basis
During than sum for active principle content, it is 100-150 meters that design temperature is interval.
Certainly, the present invention is not limited to this, in other alternative-embodiments, as long as including at least 3 in underground gasification furnace
There is a directed drilling gasification tunnel 11 is formed in coal seam 12 in individual drilling well, and at least 3 drilling wells.Hereinafter lift
Several type of furnaces of example, but only moieties option embodiment and should not be construed as limiting.
Alternatively, underground gasification furnace includes at least 3 drilling wells, wherein, at least 3 drilling wells be respectively a directed drilling and
Multiple drilling wells vertically, multiple drilling wells vertically are connected with the horizontal segment of the directed drilling, and the horizontal segment formation gasification of directed drilling is logical
Road 11.
Alternatively, underground gasification furnace includes at least 3 drilling wells, wherein, at least 3 drilling wells be respectively two directed drillings and
One or more vertical drilling wells, two horizontal segment connections of directed drilling, and all vertical drilling wells are located at two directed drillings
Between connected with the horizontal segment of one of two directed drillings, the horizontal segments of two directed drillings form gasification tunnels 11.
Certainly, the present invention is not limited to above-mentioned two embodiment, also may not include judge step 1 can perform for step a,
The step of b, c, and it is step a or step b or step c directly to perform step 1.
Additionally, in invention, valve is mounted in each drilling well, coal gas is discharged as outlet well when this drilling well is needed
When, open valve.And when current outlet well is replaced with into other drilling wells, close the valve of current outlet well.
The preferred embodiments of the present invention are these are only, is not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of underground gasification method, it is characterised in that
During the underground gasification furnace including at least three drilling wells carries out underground gasification,
Comprise the following steps：
Step 1, in the drilling well of all airflow downstreams positioned at current inlet well, determines and is obtained in that active principle content most
One drilling well of coal gas high；
Step 2, judges whether determined drilling well is current outlet well, if then returning to the step 1, if not then performing
Following steps 3；
Step 3, replaces the current outlet well as outlet well using the drilling well determined, is then with the drilling well determined
Current outlet well returns to the step 1.
2. underground gasification method according to claim 1, it is characterised in that
It is following steps a that the step 1 is performed：
The active principle content of the coal gas discharged in the drilling well of all airflow downstreams positioned at the current inlet well is detected, and will
The active principle content highest drilling well of the coal gas discharged is obtained in that active principle content highest coal gas described in being defined as
A drilling well.
3. underground gasification method according to claim 1, it is characterised in that
It is following steps b that the step 1 is performed：
Determine the position and border of combustion zone, and detect the shaft bottom of the drilling well of all airflow downstreams positioned at the current inlet well
The temperature at place；
In the drilling well of the airflow downstream by the temperature at all shaft bottoms in design temperature interval and positioned at the combustion zone most
Near a drilling well of the combustion zone, it is defined as a drilling well for being obtained in that active principle content highest coal gas.
4. underground gasification method according to claim 1, it is characterised in that
It is following steps c that the step 1 is performed：
Determine the position and border of combustion zone；
The brill of the airflow downstream by all borders apart from the combustion zone in setpoint distance is interval and positioned at the combustion zone
Near a drilling well of the combustion zone in well, it is defined as be obtained in that active principle content highest coal gas one
Drilling well.
5. underground gasification method according to claim 1, it is characterised in that before the step 1 is performed,
Can it be following steps a that the step 1 be judged to perform, if can if perform the step a, if can not if
Can it be following steps b that the step 1 be judged to perform, if can if perform the step b, if can not if perform following steps
c；
The step a：Detect the coal gas discharged in the drilling well of all airflow downstreams positioned at the current inlet well effective group
Point content, and the active principle content highest drilling well of the coal gas that will be discharged is defined as described being obtained in that active principle content
One drilling well of highest coal gas；
The step b：Determine the position and border of combustion zone, and detect all airflow downstreams positioned at the current inlet well
Temperature at the shaft bottom of drilling well；Temperature at all shaft bottoms is located in design temperature interval and positioned at the gas of the combustion zone
A drilling well near the combustion zone in the drilling well of trip is flowed down, is defined as described being obtained in that active principle content highest
One drilling well of coal gas；
The step c：Determine the position and border of combustion zone；All borders apart from the combustion zone are interval in setpoint distance
Near a drilling well of the combustion zone in the drilling well of interior and positioned at the combustion zone airflow downstream, it is defined as the energy
Enough obtain a drilling well of active principle content highest coal gas.
6. underground gasification method according to claim 2, it is characterised in that
In the case where the step 1 is performed as the step a, the active principle content is CO and H2Percent by volume it
With or CO, H2And CH4Percent by volume sum.
7. underground gasification method according to claim 5, it is characterised in that
In the case where the step 1 is performed as the step a, the active principle content is CO and H2Percent by volume it
With or CO, H2And CH4Percent by volume sum.
8. the underground gasification method according to claim 3 or 5, it is characterised in that
In the case where the step 1 is performed as the step b,
The active principle content is CO and H2Percent by volume sum, and it is 450 DEG C -550 that the design temperature is interval
℃；Or
The active principle content is CO, H2And CH4Percent by volume sum when, and it is 350 that the design temperature is interval
℃-450℃。
9. the underground gasification method according to claim 4 or 5, it is characterised in that
In the case where the step 1 is performed as the step c,
The active principle content is CO and H2Percent by volume sum, and it is 50-100 meters that the setpoint distance is interval；Or
The active principle content is CO, H2And CH4Percent by volume sum, and it is 100-150 that the setpoint distance is interval
Rice.
10. the underground gasification method according to any one of claim 3,4,7, it is characterised in that
The combustion zone is region of the temperature more than 800 DEG C.
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| CN103437748A (en) * | 2013-09-04 | 2013-12-11 | 新奥气化采煤有限公司 | Underground coal gasifying furnace and underground coal gasifying method |
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| CN104018820A (en) * | 2014-06-16 | 2014-09-03 | 北京中矿科能煤炭地下气化技术研究中心 | Coal underground gasification process system |
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| US4356866A (en) * | 1980-12-31 | 1982-11-02 | Mobil Oil Corporation | Process of underground coal gasification |
| CN101113670A (en) * | 2007-09-04 | 2008-01-30 | 新奥能源研究院有限公司 | Coal underground gasifying technology |
| CN102383772A (en) * | 2011-09-22 | 2012-03-21 | 中国矿业大学(北京) | Well drilling type oil gas preparing system through gasification and dry distillation of oil shale at normal position and technical method thereof |
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