CN103953320B - Underground gasification furnace water control method - Google Patents
Underground gasification furnace water control method Download PDFInfo
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- CN103953320B CN103953320B CN201410197869.XA CN201410197869A CN103953320B CN 103953320 B CN103953320 B CN 103953320B CN 201410197869 A CN201410197869 A CN 201410197869A CN 103953320 B CN103953320 B CN 103953320B
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Abstract
A kind of a kind of the present invention relates to underground coal gasification(UCG) field, more particularly to underground gasification furnace water control method.The underground gasification furnace water control method is included in the following steps executed before currently subterranean zone to be gasified carries out Coal Gasification：Step 1, is interval in subterranean zone to be gasified and sets up at least one horizontal well, corresponds with each horizontal well and sets up a peupendicular hole for communicating therewith, and the horizontal segment of horizontal well is located in coal seam；Each horizontal well and the peupendicular hole for communicating therewith are configured to a current sealing passage by the well head of step 2, sealed horizontal well and peupendicular hole；Step 3, injects coolant, in current sealing passage so as to currently seal parameatal coal seam containing water freezing.Thus by aqueous for coal seam around subterranean zone to be gasified fixation in the original location, ice wall is formed, aqueous to coal seam region clustering to be gasified with the coal seam for preventing outside, affect the gas composition of the gasification and generation of subterranean zone to be gasified.
Description
Technical field
A kind of a kind of the present invention relates to underground coal gasification(UCG) field, more particularly to underground gasification furnace water control method.
Background technology
In Underground Coal Gasification Process, water (it is aqueous that the water for containing coal seam is referred to as coal seam) is contained in coal seam itself, for example,
Brown coal water content itself is big, or even also there is mud coal in the local of degree of metamorphism difference.So in gasification, frequently encountering coal
The aqueous aggregation of layer affects gasification to be normally carried out, and especially the coal seam outside subterranean zone to be gasified is aqueous to the coal seam that is gasifying
Aggregation, so as to the problem for causing the gas composition for generating to decline to a great extent.
CN200810119351.9 discloses a kind of novel underground coal gasification furnace, is particularly well-suited to the gas in aqueous coal seam
Change.The novel underground coal gasification furnace takes into account underground gasification furnace and draining stove or drainage channel simultaneously.Wherein, the drainage channel
Before being efficiently used for gasifying coal seam is hydrophobic and gasification in body of heater draining, ensure the excretion of coal seam water, so as to reality
The stable gasification in existing aqueous coal seam.But water pollutant is moved after current migration that this technology is formed can also cause gasification
Move, have the risk for polluting other water sources.
CN201110435562.5 discloses a kind of underground coal gasification(UCG) gasification furnace subsoil water preventing control method and device.The party
Method comprises the steps：A part of water underground coal gasification(UCG) gasified in the overlying filled water bearing strata of stove roof plate, arranges from blood pressure lowering
Well is pumped out；The waterfront economy well for pumping out is recycled in water filling layer, water filling layer is contained for same with overlying filled water bearing strata
Water layer or different water cut layer；Wherein, the level of ground water after water-pumping/draining is carried out to overlying filled water bearing strata, in blood pressure lowering gully
It is equal to or more than the safe design water level of gasification furnace.This kind of method is needed to arranging a lot of wells and pipeline in working region, and
Impact of the coal seam water to gasification furnace in gasification cannot be prevented.
Content of the invention
It is an object of the invention to provide a kind of aqueous ground therapeutic method to keep the adverse QI flowing downwards to currently coal seam region clustering to be gasified in prevention coal seam
Change stove water control method.
For achieving the above object, there is provided a kind of underground gasification furnace water control method, it is included in currently subterranean zone to be gasified to enter
The following steps executed before row Coal Gasification：Step 1, is interval in currently subterranean zone to be gasified and sets up at least one level
Well, is corresponded with each horizontal well and sets up a peupendicular hole for communicating therewith, and the horizontal segment of horizontal well is located in coal seam；Step
2, each horizontal well and the peupendicular hole for communicating therewith are configured to one and current are sealed by the well head of sealed horizontal well and peupendicular hole
Passage；Step 3, injects coolant, in current sealing passage so as to currently seal parameatal coal seam containing water freezing.
According to the present invention, the horizontal segment of horizontal well is provided with screen casing.
According to the present invention, four current sealing passages are built around currently subterranean zone to be gasified.
According to the present invention, four current sealing passages are configured to：The peupendicular hole phase each other of two neighboring current sealing passage
To or be reversed.
According to the present invention, four current sealing passages are isolated from each other.
According to the present invention, two current sealing passages in step 1 to step 3, are constructed, wherein, two current sealing passages
The both sides of the gasification tunnel being located in currently subterranean zone to be gasified are simultaneously in parallel.
According to the present invention, the distance of the centrage of the centrage to gasification tunnel of two current sealing passages is more than or equal to
20m.
According to the present invention, underground gasification furnace water control method also comprises the steps 4-7：Step 4, in currently coal seam to be gasified
After Regional Coal gasification is finished, thaw current sealing passage；Step 5, with a current sealing passage after defrosting as new gasification
Passage, to form the subterranean zone newly to be gasified comprising the new gasification tunnel；Step 6, is interval in newly subterranean zone to be gasified and builds
Vertical horizontal segment is located at the novel sealing passage in coal seam, and the injection coolant in novel sealing passage is so that the aqueous knot in coal seam around which
Ice；Step 7, using newly subterranean zone to be gasified as currently subterranean zone to be gasified, logical as current sealing using novel sealing passage
Road, and return to step 4 circulates.Wherein, the target gasification zone 13 for carrying out Coal Gasification is needed to be divided in coal seam multiple
Subregion, many sub-regions are followed successively by above-mentioned " currently subterranean zone to be gasified " and " newly subterranean zone to be gasified ".In target gas
The whole coal seams for changing region are carried out after Coal Gasification finishes.Above-mentioned circulation stops.
According to the present invention, currently the edge adjacent with currently sealing passage of subterranean zone to be gasified is logical to the current sealing
The distance of the centrage in road is more than 5m.
According to the present invention, also include：In currently Regional Coal gasification in coal seam to be gasified, in detection peupendicular hole well head
The step of pressure of gas, wherein, injection coolant is supplemented when pressure rises in current sealing passage, until recovering to institute
State the pressure value before rising.
Compared to prior art, beneficial effects of the present invention are：
The present invention is interval in currently subterranean zone to be gasified and builds current sealing passage, and to currently seam area to be gasified
The forward direction that domain carries out gasifying currently seals injection coolant in passage, so as to parameatal coal seam is currently sealed containing water freezing,
Thus by aqueous for coal seam around currently subterranean zone to be gasified fixation in the original location, form ice wall.The ice wall is currently waited to gasify
Subterranean zone is isolated with the coal seam on the outside of ice wall, aqueous to currently coal seam region clustering to be gasified, shadow with the coal seam for preventing outside
The gas composition of the gasification and generation of sound subterranean zone currently to be gasified.Meanwhile, it also avoid currently subterranean zone to be gasified
Aqueous to the coal seam on the outside of the ice wall impact of pollutant that gasification is produced.
Description of the drawings
Fig. 1 is that one embodiment of the underground gasification furnace water control method of the present invention is applied to underground coal gasification system
Schematic top plan view；
Fig. 2 is the schematic cross-section of the underground coal gasification system shown in Fig. 1；
Fig. 3 is former Soviet Union's empirical data curve chart；
Fig. 4 is former Soviet Union's empirical data curve amendment figure；
Fig. 5 is that second embodiment of the underground gasification furnace water control method of the present invention is applied to underground coal gasification system
Schematic top plan view；
Fig. 6 is the schematic cross-section of the underground coal gasification system shown in Fig. 5；
Fig. 7 is that the 3rd embodiment of the underground gasification furnace water control method of the present invention is applied to underground coal gasification system
Schematic top plan view；
Fig. 8 is the schematic cross-section of the underground coal gasification system shown in Fig. 7.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described.
Underground coal gasification(UCG) is to make underground coal by the technology that thermal chemical reaction in situ conversion is fuel gas, and collection is built
Well, coal mining, three big techniques of conversion are integrated.One or more gasification tunnels are set up in coal seam, in gasification tunnel are passed through oxygen
Agent is simultaneously lighted, and gradually expands combustion range with from burning towards from the beginning of the coal seam of gasification tunnel, so that surrounding this
Or the subterranean zone gasification around multiple gasification tunnels, and burned out area is formed after gasification.In the present invention, will be on coal ground
Be centered around coal around one or more gasification tunnels and that burned out area is formed after a underground coal gasification(UCG) before lower gasification
Layer region is referred to as " currently subterranean zone to be gasified ".In the following examples of the present invention, by currently subterranean zone to be gasified
When overlooking, (during by vertically seeing earthward) is illustrated with rectangular box, and with reference one token.It is understood that current
Set desired combustion zone before the only coal seam gasification of subterranean zone to be gasified, and actually accomplish the region of Coal Gasification simultaneously
Not necessarily currently it is completely superposed subterranean zone to be gasified with this, also differs and be set to the rectangle of rule.Additionally, removing following embodiments
In other embodiment in addition, according to actual needs, during vertical view, currently the shape of subterranean zone to be gasified is not limited to rectangle.
With reference to Fig. 1, one embodiment of the underground gasification furnace water control method of the present invention, currently coal seam to be gasified is included in
The following steps that region 1 is executed before carrying out Coal Gasification：Step 1, be interval in the currently subterranean zone to be gasified 1 set up to
A few horizontal well 2, is corresponded with each horizontal well 2 and sets up a peupendicular hole 3 for communicating therewith, the water of the horizontal well 2
Flat section is located in coal seam；Step 2, seals the well head of the horizontal well 2 and the peupendicular hole 3, by each horizontal well 2 and and its
The peupendicular hole 3 of connection is configured to a current sealing passage；Step 3, injects coolant in the current sealing passage, so that
Described parameatal coal seam is currently sealed containing water freezing.
Above-mentioned steps will currently seal the aqueous fixation in parameatal coal seam in the original location, form ice wall.It is understood that the ice wall
It is to extend being formed from currently sealing vias inner walls to coal seam around and surround current sealing passage.Thus, the ice wall ought
Before subterranean zone to be gasified isolate with the coal seam of (away from the side of currently subterranean zone to be gasified) on the outside of ice wall, with prevent outside
Coal seam aqueous to currently coal seam region clustering to be gasified, affect the coal gas of the currently gasification and generation of subterranean zone to be gasified
Component.Meanwhile, it also avoid the pollutant of currently gasification generation in subterranean zone the to be gasified shadow aqueous to the coal seam on the outside of ice wall
Ring.Wherein, it is appreciated that the not daily seen ice wall for constituting that only gathered together by water-setting of ice wall formed herein.But
By aqueous for coal seam fixation in the original location to close the gap in coal seam, to stop that the water in outside is currently waited to gasify through the gap flow direction
Subterranean zone.Wherein, coal seam is to surround sealing passage containing the ice wall that water freezing is formed, you can be interpreted as sealing passage ice
Freeze.Additionally, the ice wall for being formed is interval in currently wait subterranean zone of gasifying with when currently whne gasification coal seam Regional Coal gasification
Its dash effect is kept, and is not affected by coal seam Regional Coal to be gasified gasification.
With continued reference to Fig. 1 and Fig. 2, specifically execution step 1 as follows：
Before currently subterranean zone to be gasified 1 carries out Coal Gasification, four are set up around currently subterranean zone to be gasified 1
The well head of horizontal well 2 and four peupendicular holes 3, each horizontal well 2 and each peupendicular hole 3 is respectively positioned on more than earth's surface, each horizontal well 2
Horizontal segment be in coal seam, and the bottom of the end in coal seam of each horizontal well 2 and a peupendicular hole 3 connects
Logical, i.e., four peupendicular holes 3 are connected with four horizontal wells 2 respectively.In other words, each horizontal well 2 is only connected with a peupendicular hole 3,
Each peupendicular hole 3 is only connected with a horizontal well 2, and four horizontal wells 2 are corresponded with four peupendicular holes 3 and connected.At this
In embodiment, a diameter of 177mm of each horizontal well 2, and the centrage of each horizontal well 2 and currently subterranean zone to be gasified
The distance at 1 edge adjacent with the horizontal well 2 is more than 5m.
Additionally, in the present embodiment, during vertical view, pointed to and which by the well head (being illustrated with labelling " 12 ") of each horizontal well 2
Counterclockwise, in other words the direction of the peupendicular hole 3 of connection is, and the well head of each peupendicular hole 3 and is adjacent but does not connect
The well head of logical horizontal well 2 is relative.
With reference to Fig. 2,1 the step of the present embodiment in the step of be additionally included in the horizontal segment of each horizontal well 3 screen casing 4 be set.
Wherein, alternatively, screen casing 4 is set after the completion of horizontal well 2 is connected with peupendicular hole 3.With multiple horizontal wells 2 and peupendicular hole 3
In the case of, screen casing 4 can be set after whole horizontal wells 2 are set up and connect with peupendicular hole 3, it is also possible in each horizontal well 2
The screen casing 4 being located therein just is set after the completion of foundation.Certainly, be not limited to above-mentioned, for ease of the simplicity of practical operation, this area
Technical staff can select random time to arrange screen casing 4 before above-mentioned steps 2 are carried out.Reference " 5 " shows roof
Rock.
The diameter of the horizontal well 3 arranged in coal seam is universal less, it is easy to which the phenomenon of shrinkage cavity or collapse hole occurs.In water
The horizontal segment of horizontal well 3 arranges screen casing 4, to carry out supporting to horizontal well 3, it is possible thereby to effectively ensure the unobstructed of horizontal well 2, also
The coolant being subsequently injected into can be made more fully to contact with coal seam, quickly completed heat transfer process, and connected with peupendicular hole 3.
With further reference to Fig. 1 and Fig. 2, when overlooking, currently subterranean zone to be gasified 1 is rectangular, and four horizontal wells 2 are distinguished
Four edges of parallel currently subterranean zone to be gasified 1, to form above-mentioned " surrounding ".Certainly it is understood that treating gasification of coal currently
In embodiment of the layer region 1 in other shapes, annular of four horizontal wells 2 in interruption is surrounded currently subterranean zone to be gasified 1 and is
For realizing above-mentioned " surrounding ".
Following specifically execution step 2：
Seal the well head of each horizontal well 2 and each peupendicular hole 3.Thus, horizontal well 2 and coupled logical peupendicular hole 3
Constitute the current sealing passage of a sealing.In the present embodiment, four horizontal wells 2 and four peupendicular holes 3 constitute four altogether
Current sealing passage.
Additionally, in the present embodiment, this four current sealing passages are mutually isolated, i.e., between four current sealing passages not
Connection.For example, four horizontal wells 2 that sets up in step 1 are not interconnected, and four for setting up in step 1 peupendicular hole 3 is equal
It is not interconnected, and also there are no other wells by four current sealing channel connections.It is achieved in aforementioned four currently to seal
Passage mutually isolated.Current sealing passage in the present invention is mutually isolated, can prevent each from sealing the liquid nitrogen in passage
Gasification influences each other.
Further, it can be appreciated that, as four horizontal wells 2 are set up around currently subterranean zone to be gasified 1, then built by which
Four current sealing passages be also around currently subterranean zone to be gasified 1.And the centrage of horizontal well 2 is its each structure
The centrage of the current sealing passage that builds, so as to the centrage of each current sealing passage is to currently subterranean zone to be gasified 1
The distance at the edge being adjacent is more than 5m.
Following execution step 3：
Corresponding to each current sealing passage, one liquid nitrogen storage tank 6 and a pressure temperature measuring device 7 are set, wherein,
Liquid nitrogen storage tank 6 is connected with the well head of horizontal well 2, and pressure temperature measuring device 7 is arranged at the well head of peupendicular hole 3.Liquid nitrogen is being stored up
Tank 6 and pressure temperature measuring device 7 inject coolant after setting completed, in horizontal well 2, alternatively, can be to four horizontal wells 2
Be injected simultaneously into or injected with random order, as long as completing before Coal Gasification being carried out to currently subterranean zone to be gasified 1.By
It is sealing in passage is currently sealed, so liquid nitrogen is just sealed in after being entered in current sealing passage by 2 well head of horizontal well
In current sealing passage.It is understood that in the present embodiment, liquid nitrogen storage tank 6 and pressure are respectively provided with corresponding to each current sealing passage
Power temperature measuring equipment 7, therefore pressure temperature measuring device 7 is directed to respective testing result and controls corresponding liquid nitrogen storage tank 6, with
Realize that the liquid nitrogen injection of each current sealing passage is separate.
In the present embodiment, coolant is liquid nitrogen.The phase that liquid nitrogen is calculated by the volume of calculated level well 2 and peupendicular hole 3
Injection rate is answered, in time to stop injecting.In injection process, liquid nitrogen starts endothermic gasification and forms nitrogen, and part nitrogen is passed through
Horizontal well 3 flows to the well head of peupendicular hole 2, the temperature and pressure of the gas of the well head of the detection peupendicular hole 3 of pressure temperature measuring device 7
Power.Thus, in injection process, the gasification of liquid nitrogen meeting part is nitrogen, and enters in coal seam, i.e., miss in coal seam, leakage
The empirical value of rate is 30%, therefore preferably, the injected slurry volume of liquid nitrogen is 1.3 times of horizontal well 2 and the volume sum of peupendicular hole 3.
Certainly, the present invention is not limited to this, and those skilled in the art can be determined according to practical situation during practical operation, only
Ice wall can be formed and the ice wall is prevented from the outside of ice wall during currently coal seam Regional Coal to be gasified gasifies
Water is entered in currently subterranean zone to be gasified.As nitrogen critical pressure is 3.4MPa, (refer in rock mass and deposit much smaller than ground pressure
Power), liquid nitrogen can be remained in current sealing passage to the aqueous cooling in the coal seam of surrounding so that coal seam contains water freezing.
Typically at 15 DEG C or so, liquid nitrogen is easy to make which be reduced to 0 DEG C primitive coalbed temperature.And then make currently to seal passage
The coal seam of surrounding contains water freezing, and coal seam itself also has preferable heat insulating ability, and after injection liquid nitrogen, a period of time will be formed
Ice wall is worked as with preventing the aqueous flow direction in the coal seam in (side relative with currently subterranean zone to be gasified of ice wall is as outside) on the outside of which
Before subterranean zone to be gasified, and then reach control water purpose.Wherein, after the completion of liquid nitrogen injection, it is logical that liquid nitrogen is sealed in sealing
In road, the pressure of the gas of the well head of the detection peupendicular hole 3 of pressure temperature measuring device 7, when the pressure stability is constant, represents ice
Wall has been formed, and can now start to carry out Coal Gasification to currently subterranean zone to be gasified.It is completed to from the injection of above-mentioned liquid nitrogen
The time that above-mentioned Coal Gasification can be started is above-mentioned " for a period of time ".It is understood that above-mentioned " stablizing constant " has both included that pressure value is permanent
It is set to the situation of a numerical value, also includes the situation that pressure value is floated around a numerical value.
It is understood that the connection of liquid nitrogen storage tank 6 and 2 well head of horizontal well does not destroy the sealing of 2 well head of horizontal well, horizontal well 2
Well head still keeps sealing relative to external environment, and is only to allow the liquid nitrogen injection in liquid nitrogen storage tank 6.
Additionally, according to former Soviet Union's empirical equation：Y=400x2- 1200x+1000 (wherein y- coal seams temperature (T), x- coal seams
To flame face distance (D), with reference to Fig. 3), it is modified through exponential fitting, obtains the empirical equation in the range of 10 meters：y
=1084.126e(-1.662x)(with reference to Fig. 4).Thus, such as table 1 below is obtained：
| Distance (D)/m | 0.00 | 0.10 | 0.20 | 0.30 | 0.40 | 0.50 | 0.60 | 0.70 | 0.80 | 0.90 |
| Temperature (T)/DEG C | 1084.13 | 918.12 | 777.54 | 658.48 | 557.65 | 472.26 | 399.95 | 338.70 | 286.84 | 242. 92 |
| Distance (D)/m | 1.00 | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 1.60 | 1.70 | 1.80 | 1.90 |
| Temperature (T)/DEG C | 205.72 | 174.22 | 147.54 | 124.95 | 105.82 | 89.62 | 75.89 | 64.27 | 54.43 | 46.1 0 |
| Distance (D)/m | 2.00 | 2.10 | 2.20 | 2.30 | 2.40 | 2.50 | 2.60 | 2.70 | 2.80 | 2.90 |
| Temperature (T)/DEG C | 39.04 | 33.06 | 28.00 | 23.71 | 20.08 | 17.01 | 14.40 | 12.20 | 10.33 | 8.75 |
Table 1
Understand referring to table 1 and Fig. 4, after 2.5m, the constant temperature in coal seam declines finally close to 0, therefore can recognize
It is that the coal seam for being more than 2.5m apart from the edge of currently subterranean zone to be gasified 1 is primitive coalbed temperature, is not currently treated substantially
Temperature conduction of the gasification subterranean zone 1 in gasification affects.
Thus, 1000 DEG C of coverages in coal seam are 2m or so, so Coal Gasification is currently waited to gasify for distance
The impact of the ice wall of the edge 5m of subterranean zone 1 is little.Additionally, the height that currently Coal Gasification of subterranean zone to be gasified 1 is produced
Temperature is mainly carried by coal gas, and Coal Gasification pressure is less than 1MPa, and the heated effluent field for causing is narrower, and the impact to ice wall is not
Greatly.But inevitably, diabatic process is the process that thermal balance is set up, it may be necessary to the very long time, in Coal Gasification mistake
Cheng Zhong, it is also possible to cause the partial gasification of liquid nitrogen, that is, show that the temperature of ice wall rises, the aqueous for causing part to freeze.
According to above-mentioned, it is further up to good control water effect in coal gasification processes, executes following steps：
The pressure that gas in 3 well head of peupendicular hole is detected by pressure temperature measuring device 7, when pressure rises, by level
The well head of well 2 supplements injection liquid nitrogen in current sealing passage, until the pressure value before recovering to the rising.I.e. logical in sealing
Pass through in road in the case that the sealing of step 1- step 3 laid in liquid nitrogen, gasify in currently coal seam Regional Coal gasify
When supplement injection liquid nitrogen, to ensure that ice wall will not be melted due to the rising of the temperature of current subterranean zone gasify.By upper
State description understand, start to currently wait gasify subterranean zone carry out Coal Gasification when, pressure temperature measuring device 7 is detected vertically
The pressure stability of the gas of the well head of well 3 is constant.And the carrying out with the current Coal Gasification of subterranean zone to be gasified, above-mentioned
When pressure rises, in current sealing passage, injection liquid nitrogen is supplemented, currently to seal parameatal coal seam aqueous to absorb this
Heat makes which keep condensing.It is understood, of course, that, above-mentioned " stablizing constant " be pressure value constant be a numerical value situation, when
Above-mentioned " rising " is that the detected pressure for obtaining gas of pressure temperature measuring device 7 is more than the numerical value, in current sealing passage
Injection liquid nitrogen is supplemented, is stopped when the pressure of the gas detected by pressure temperature measuring device 7 is equal to the numerical value to current
Injection liquid nitrogen is supplemented in sealing passage；It is the situation that pressure value is floated around a numerical value above-mentioned " stablizing constant ", when above-mentioned
" rising " is that pressure temperature measuring device 7 is detected that the pressure of gas overflows the domain of walker of the numerical value, to current sealing
Injection liquid nitrogen is supplemented in passage, is stopped when the detected pressure for obtaining gas of pressure temperature measuring device 7 is equal to the numerical value
Injection liquid nitrogen is supplemented in current sealing passage.
Additionally, currently, after gasification subterranean zone 1 is fully completed Coal Gasification, or burned out area is after treatment, stops
The pressure of gas in detection 3 well head of peupendicular hole.
Referring to Fig. 5 and Fig. 6, second embodiment of the present invention is described, wherein with above-mentioned one embodiment something in common
Repeat no more.
The four current sealing passages that is set up in the present embodiment are configured to：Two neighboring current sealing passage vertical
Well 3 toward each other or is reversed.In other words, when overlooking, in two neighboring current sealing passage, by the well of horizontal well 2
The direction of mouthful well head for pointing to peupendicular hole 3 is opposite each other, i.e. respectively clockwise and counterclockwise.For example, with reference to figure
5, when overlooking, the peupendicular hole positioned at the current sealing passage of the currently top of subterranean zone to be gasified 1 is located at the current sealing
The right side of passage, i.e., the direction that the peupendicular hole is pointed in the direction by the well head of the horizontal well for communicating therewith are clockwise, and are located at
Currently the peupendicular hole of the current sealing passage on the right side of subterranean zone to be gasified 1 be located at this current sealing passage upside, i.e., by
It is counterclockwise that the direction of the peupendicular hole is pointed in the direction of the well head of the horizontal well for communicating therewith, and is thus located at above-mentioned top and right side
Two current sealing passages peupendicular holes 3 relative to each other.During vertical view, working as positioned at the currently left side of subterranean zone to be gasified 1
The peupendicular hole of front sealing passage is located at the lower section of the current sealing passage, i.e., referred to by the direction of the well head of the horizontal well for communicating therewith
Be counterclockwise to the direction of the peupendicular hole, be thus located at above-mentioned top and left side two current sealing passages peupendicular holes 3 that
This is contrary.In the present embodiment, adjacent two current sealing passages can share a liquid nitrogen storage tank 6 or pressure temperature measuring dress
7 are put, so as in the present embodiment, it is only necessary to two liquid nitrogen storage tanks 6 and two pressure temperature measuring devices 7 are set, are greatly reduced
Cost, and easily facilitate operation.
Wherein, it is appreciated that the building process of current sealing passage is similarly the step of describing in one embodiment 1 and step
Rapid 2, the present embodiment is only mainly to build the current horizontal well of sealing passage and the position of peupendicular hole and corresponding liquid nitrogen storage tank
6 and pressure temperature measuring device 7 setting different from first embodiment.
With reference to Fig. 7 and Fig. 8, the 3rd embodiment of the present invention is described, wherein with above-mentioned one embodiment something in common
Repeat no more.
Two current sealing passages are built in the present embodiment, and the respectively first current sealing passage 9 and second is currently close
Envelope passage 10.Wherein, currently there is in subterranean zone to be gasified 1 gasification tunnel, and (gasification is led to by here for convenience of sketching
Road is referred to as " current gasification tunnel ", and with reference " 8 " labelling), the first current sealing passage 9 and the second current sealing logical
Road 10 is each parallel to current gasification tunnel 8, and the first current sealing passage 9 and the second current sealing passage 10 are located at respectively and work as
The both sides of front gasification tunnel 8.Wherein, currently subterranean zone to be gasified 1 two parallel with current gasification tunnel 8 edge to work as
The distance of 8 centrage of front gasification tunnel is the centrage of 15m, the first current sealing passage 9 and the second current sealing passage 10
Distance to the centrage of current gasification tunnel 8 is all higher than or is equal to 20m.It is understood that the first current sealing passage 9 and second is worked as
The building process of front sealing passage 10 is similarly the step of describing in one embodiment 1 and step 2, and the present embodiment is only mainly
Build the position of horizontal well and peupendicular hole of the first current sealing passage 9 and the second current sealing passage 10 with first embodiment not
With so that the position of the first current sealing passage 9 and the second current sealing passage 10 is different from first embodiment.
Additionally, in the present embodiment, also comprise the steps：Step 4, in currently 1 Coal Gasification of subterranean zone to be gasified
After finishing, thaw current sealing passage；Step 5, with a current sealing passage after defrosting as new gasification tunnel, to form bag
Subterranean zone 1 ' newly to be gasified containing the new gasification tunnel；Step 6, is interval in newly subterranean zone to be gasified 1 ' and sets up horizontal section
Novel sealing passage in coal seam, the injection coolant in the novel sealing passage is so that the coal seam around which contains water freezing；Step
Rapid 7, using newly subterranean zone 1 ' to be gasified as currently subterranean zone to be gasified 1, using novel sealing passage as current sealing passage,
And return to step 4 is circulated.
Specifically, in the present embodiment, after the gasification of gasification subterranean zone 1 is finished the first current sealing is led to currently
The sealing solution of the well head of the horizontal well and peupendicular hole in road 9 divided by nitrogen therein is discharged, by the water of the second current sealing passage 10
The sealing solution of the well head of horizontal well and peupendicular hole divided by nitrogen therein is discharged, i.e., after contact sealing, the first current sealing passage 9
Nitrogen in sealing passage 10 current with second is discharged by the well head of peupendicular hole.Wherein, the nitrogen for being discharged both was included in
State in injection process and nitrogen that currently subterranean zone gasification to be gasified is generated, include after depressurization again in current sealing passage
The liquid nitrogen of residual changes thermogenetic nitrogen with surrounding (for example entering the air of current sealing passage).Thus, by currently close
Envelope vias inner walls extend the ice wall to be formed and melt to coal seam around so that current sealing passage thaws.Certainly, these are only makes
With liquid nitrogen be in the case of coolant to sealing passage and thawing the step of, in the case of using other coolants, according to difference
Coolant, those skilled in the art may be selected corresponding mode to seal passage thaw so which can be used as new in step 5
Gasification tunnel.So far, above-mentioned steps 4 are completed.
Then, it is new with second current sealing passage 10 (now the nitrogen in the second current sealing passage 10 is discharged)
Gasification tunnel, the coal seam comprising the second current sealing passage 10 define newly subterranean zone 1 ' to be gasified, with to the part coal seam
The further Coal Gasification in region.In other words, newly subterranean zone 1 ' to be gasified includes new gasification tunnel (the i.e. second current sealing passage
10).So far, above-mentioned steps 5 are completed.
And before to newly subterranean zone to be gasified 1 ' carries out Coal Gasification, be interval in newly subterranean zone 1 ' to be gasified and set up newly
Sealing passage 11, the novel sealing passage 11 have the horizontal segment being located in coal seam.In the present embodiment, set up a novel sealing to lead to
Road 11, and the structure of novel sealing passage 11 is identical with the construction method of current sealing passage in above-mentioned steps 1 and step 2.Tool
Body is the peupendicular hole that sets up a horizontal well He communicate therewith, then the well head of sealed horizontal well and peupendicular hole, by water
Horizontal well and peupendicular hole are configured to novel sealing passage 11.Finally, liquid nitrogen is injected in novel sealing passage 11, so that novel sealing passage 11
The coal seam of surrounding forms ice wall containing water freezing.So far above-mentioned steps 6 are completed.Afterwards, newly subterranean zone to be gasified 1 ' can be carried out
Coal Gasification.
Then, using newly subterranean zone 1 ' to be gasified as currently subterranean zone to be gasified 1, using novel sealing passage 11 as
Two current sealing passages 10, return the step 4 and continue to carry out to step 7.Thus just define comprising novel sealing passage 11
Another novel sealing passage for being formed and another subterranean zone newly to be gasified.Wherein, the mesh for carrying out Coal Gasification is needed in coal seam
Mark gasification zone 13 is divided into many sub-regions, and many sub-regions are followed successively by above-mentioned " currently subterranean zone to be gasified " and " new
Subterranean zone to be gasified ".Carry out after Coal Gasification finishes in whole coal seams of target gasification zone 13.Above-mentioned circulation stops.
It is understood that when the gasification tunnel of " newly wait subterranean zone of gasifying " is gasified for " currently wait subterranean zone of gasifying "
One current sealing passage.Thus, in the present embodiment, same passage is again logical as new gasification i.e. as current sealing passage
Improve production efficiency in road, escapable cost.
Certainly, step 4 can equally be similarly used for above-mentioned one embodiment and second embodiment to step 7.
Additionally, position of the horizontal segment of horizontal well in coal seam be alternatively located in currently subterranean zone to be gasified along thickness side
To centre position, be certainly not limited to this, as long as can realize preventing coal seam aqueous flows in currently subterranean zone to be gasified
Dynamic.
And carried out in coal seam due to the foundation of horizontal well and peupendicular hole of the present invention, so the present invention relates to
" parallel " had been both 0 ° parallel comprising angle, and comprising approximate parallel (i.e. parallel in non-critical meaning), as long as finally may be used
To realize that preventing coal seam aqueous flows in currently subterranean zone to be gasified.
In addition, in the present invention, " currently subterranean zone to be gasified " is corresponding to the coal seam for needing at present to carry out Coal Gasification
Region；" currently sealing passage " is the sealing passage for providing dash effect for " currently subterranean zone to be gasified "；" current gasification is logical
Road " is the gasification tunnel in " currently subterranean zone to be gasified ", with combustion after injecting oxidant to " current gasification tunnel " and lighting
Burn the coal seam around " current gasification tunnel ", carry out coal gasification processes, the coal seam limited by " currently subterranean zone to be gasified "
Region is the burned out area formed after the Coal Gasification is finished.And " newly subterranean zone to be gasified " is " currently subterranean zone to be gasified "
After completing Coal Gasification, need the subterranean zone that carries out Coal Gasification, i.e. " newly subterranean zone to be gasified " to become subsequent time to work as
The front subterranean zone for needing to carry out Coal Gasification, in other words, which becomes new " a currently subterranean zone to be gasified "." Xinmi City
Envelope passage " is the sealing passage for providing dash effect for " newly subterranean zone to be gasified "；" new gasification tunnel " is " newly to treat gasification of coal
Gasification tunnel in layer region ".
Furthermore, the involved quantity for sealing passage only exemplary, art technology in above three embodiment
Personnel can determine the logical quantity of sealing and arrangement according to the situation of actual subterranean zone currently to be gasified, as long as can be real
Now stop that the coal seam on the outside of ice wall is aqueous and enter currently subterranean zone to be gasified.
The preferred embodiments of the present invention are these are only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications that within the spirit and principles in the present invention, is made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of underground gasification furnace water control method, it is characterised in that
It is included in the following steps executed before currently subterranean zone (1) to be gasified carries out Coal Gasification：
Step 1, is interval in subterranean zone (1) currently to be gasified and sets up at least one horizontal well (2), with level each described
Well (2) is corresponded sets up a peupendicular hole for communicating therewith (3), and the horizontal segment of horizontal well (2) is located in coal seam；
Step 2, seals the well head of horizontal well (2) and the peupendicular hole (3), by each horizontal well (2) and communicates therewith
Peupendicular hole (3) be configured to a current sealing passage；
Step 3, injects coolant, in the current sealing passage so that described currently seal the aqueous knot in parameatal coal seam
Ice；
Four current sealing passages are built around described subterranean zone (1) currently to be gasified；
Described four current sealing passages are isolated from each other.
2. underground gasification furnace water control method according to claim 1, it is characterised in that
The horizontal segment of the horizontal well (2) is provided with screen casing (4).
3. underground gasification furnace water control method according to claim 1, it is characterised in that
Described four current sealing passages are configured to：
The peupendicular hole (3) of the two neighboring current sealing passage toward each other or is reversed.
4. underground gasification furnace water control method according to claim 1, it is characterised in that
The step 1 constructs two current sealing passages into step 3, wherein, described two current sealing passage positions
The both sides of the gasification tunnel in subterranean zone (1) currently to be gasified are simultaneously in parallel.
5. underground gasification furnace water control method according to claim 4, it is characterised in that
The distance of the centrage of the centrage to the gasification tunnel of described two current sealing passages is more than or equal to 20m.
6. the underground gasification furnace water control method according to claim 4 or 5, it is characterised in that the underground gasification furnace control water
Method also comprises the steps 4-7：
Step 4, described currently after gasification subterranean zone (1) Coal Gasification is finished, thaw the current sealing passage；
Step 5, with a current sealing passage after defrosting as new gasification tunnel, to form newly treating comprising the new gasification tunnel
Gasification subterranean zone (1 ')；
Step 6, is interval in subterranean zone (1 ') newly to be gasified and sets up novel sealing passage of the horizontal segment in coal seam, to institute
Injection coolant in novel sealing passage is stated so that the coal seam around which contains water freezing；
Step 7, using subterranean zone (1 ') newly to be gasified as currently to be gasified to subterranean zone (1), logical with the novel sealing
Road is used as current sealing passage, and returns the step 4 and circulate.
7. underground gasification furnace water control method according to claim 1, it is characterised in that
The edge adjacent with the current sealing passage of subterranean zone (1) currently to be gasified is to the current sealing passage
The distance of centrage is more than 5m.
8. underground gasification furnace water control method according to claim 1, it is characterised in that
Also include：In currently subterranean zone (1) coal gasification processes to be gasified, gas in detection peupendicular hole (3) well head
Pressure the step of,
Wherein, injection coolant is supplemented when the pressure rises in the current sealing passage, until the pressure recovers
Pressure value to the rising.
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| CN104533378B (en) * | 2014-12-04 | 2017-10-24 | 新奥科技发展有限公司 | Underground sewage control method |
| CN106089179B (en) * | 2016-08-24 | 2018-10-30 | 中为(上海)能源技术有限公司 | For the withdrawal well equipment of Underground Coal Gasification Process and its application |
| CN110145294B (en) * | 2019-06-21 | 2020-03-27 | 中国矿业大学 | Coal field fire area coal pressing underground in-situ gasification method |
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| US4463807A (en) * | 1981-06-15 | 1984-08-07 | In Situ Technology, Inc. | Minimizing subsidence effects during production of coal in situ |
| US6932155B2 (en) * | 2001-10-24 | 2005-08-23 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation via backproducing through a heater well |
| CN100340738C (en) * | 2003-10-08 | 2007-10-03 | 新汶矿业集团有限责任公司 | Water seal stopping leak process for underground gasification furnace |
| CN101315026B (en) * | 2008-07-01 | 2011-08-31 | 北京中矿科能煤炭地下气化技术研究中心 | Underground coal gasification system and producing process |
| CN101864941B (en) * | 2010-03-23 | 2013-08-28 | 邓惠荣 | Ultra-deep coal underground gasification technology |
| EA017460B1 (en) * | 2010-08-17 | 2012-12-28 | Открытое Акционерное Общество "Газпром Промгаз" | Method for borehole complex developing of metal and coal bed |
| CA2780670C (en) * | 2012-06-22 | 2017-10-31 | Imperial Oil Resources Limited | Improving recovery from a subsurface hydrocarbon reservoir |
| CN103437748B (en) * | 2013-09-04 | 2016-08-10 | 新奥气化采煤有限公司 | Coal underground gasifying furnace and coal underground gasification method |
| CN103590805B (en) * | 2013-11-22 | 2017-05-03 | 新奥科技发展有限公司 | Broaching method of coal seam channel |
| CN103742122B (en) * | 2014-01-28 | 2017-09-19 | 新奥科技发展有限公司 | Underground coal gasification system and gasification process |
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