CN107313803A - A kind of underground burned out area volume is determined and placement method - Google Patents
A kind of underground burned out area volume is determined and placement method Download PDFInfo
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- CN107313803A CN107313803A CN201710462088.2A CN201710462088A CN107313803A CN 107313803 A CN107313803 A CN 107313803A CN 201710462088 A CN201710462088 A CN 201710462088A CN 107313803 A CN107313803 A CN 107313803A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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Abstract
Determined the invention provides a kind of underground burned out area volume and placement method, it is characterised in that including：Detection underground gasification area gas background value is collected in step S1, gasification after terminating；Step S2, collects in other each ventholes after a certain air admission hole is passed through search gas and detects gas componant；Step S3, by the volume for calculating underground burned out area；Step S4, measuring and calculating the burned out area volume drawn and the numerical value that conventionally calculation is drawn are compared, and more than certain scale or according to demand, then carry out step S5；Step S5, venthole exhausting formation negative pressure, air admission hole slip casting is quantitatively filled.The present invention can direct measuring go out the volume size of underground burned out area, it is simple to operate, calculate easily, cost it is not high.It can not consider that the burned out area volume that rock stratum dilatancy is calculated is verified to conventional.On the premise of burned out area scale is known, negative pressure filling is carried out to the burned out area of necessary or desirable filling, while being easy to control filler quantity and cost, the complete closed filling of underground burned out area is realized.
Description
Technical field
The invention belongs to underground coal gasification(UCG) production technique field, it is related to and a kind of definitely descend burned out area volume size and fill
Embankment method.
Background technology
Underground coal gasification(UCG) is, by the controlled burning of underground coal, coal to be converted into one kind of fuel gas on the spot
Chemical coal-mining method.From coal-face need not be manually entered in this method production process unlike traditional pit mining, and
Underground need not construct all kinds of tunnels and related chamber, it is only necessary to which construction geology drills, and input after gasifying agent ignites coal seam
Earth's surface will be drained into by the form of mixed gas using composition in coal resources.Underground coal gasification(UCG), which has, improves coal money
The utilization rate in source, reduces artificial labor intensity, significantly reduces the advantage such as environmental disruption and atmosphere pollution.
Coal resources are formed burned out area after the completion of gasification, by reasonably arranging that insulation blocking coal column can avoid earth's surface
Large area is settled or collapsed, but burned out area superstratum Stress relief, unstability, produces a certain degree of avalanche, crack and change
Shape is inevitable, and surface subsidence change sometimes is a slow process, if in earth's surface construction building thing, road after the several years
The Artificial facilities such as road, however not excluded that the presence of underground burned out area causes the loss of earth's surface life, property.Meanwhile, if preservation in stratum
Multilayer coal resources, wherein the burned out area formed after the completion of one layer of gasification certainly will influence the exploitation of its adjacent bed, are caused to a certain degree
The wasting of resources.Therefore, it is necessary to grasp underground combustion sky exactly after coal resources are plucked out of by gasification completion, useful constituent
The volume size in area, and regarding burned out area cavity scale, it is rationally filled using specific method, to avoid follow-up stratum
Collapse, improve multilayer coal resources utilization rate, while accomplishing coal resources clean utilization, reservoir stress distribution is reverted to flat
The state of weighing apparatus.
The content of the invention
Determined and placement method in consideration of it, the present invention proposes a kind of underground burned out area volume, it is intended to solve the above problems.
The present invention proposes a kind of underground burned out area volume and determined and placement method, it is characterised in that including
Detection underground gasification area gas background value is collected in step S1, gasification after terminating；
Step S2, collects in other each ventholes after a certain air admission hole is passed through search gas and detects gas componant；
Step S3, by the volume for calculating underground burned out area；
Step S4, measuring and calculating the burned out area volume drawn and the numerical value that conventionally calculation is drawn are compared, more than a set pattern
Mould or according to demand, then carry out step S5；
Step S5, venthole exhausting formation negative pressure, air admission hole slip casting is quantitatively filled.
Further, above-mentioned underground burned out area volume determine and placement method in, it is characterised in that step S1, each air inlet
Hole stops air inlet, when each venthole aperture does not have outlet pressure, collects detection underground gas background value.
Further, above-mentioned underground burned out area volume determine and placement method in, it is characterised in that step S2, in air inlet
Hole aperture connects search gas release device, connects search gas collection device in venthole, pulse release is used in air admission hole
Method injection radio isotope search gas or stable isotope search gas, gas tracer is with 300cm3/ min's
Speed is injected, and concentration of the injection tracer in coal seam gas is reached 150mg/L.
Further, above-mentioned underground burned out area volume determine and placement method in, it is characterised in that step S5, in outlet
Hole aperture is installed by exhausting facility.
Further, above-mentioned underground burned out area volume determine and placement method in, it is characterised in that step S5, slip casting material
Material is from CL-C types clay cement grout, Cement fly ash, lotion slurry, Paste-like body slurry or biliquid combined casting material.
Further, above-mentioned underground burned out area volume determine and placement method in, it is characterised in that step S4, work as measuring and calculating
When the burned out area volume drawn is more than pass through Coal-fired capacity and mixed gas calculation volume 1/3, burned out area is filled.
Further, above-mentioned underground burned out area volume determine and placement method in, it is characterised in that step S3, utilize gal
Horse logging instrument or gamma spectrometer carry out outlet monitoring, when there is trace gas concentration t1, and it is dense that 2-3 peak value occurs in continuation monitoring
Calculated when degree is to t2,
In formula：
M：Inject gas gross mass；
M1：The gaseous mass of discharge in t1 to the t2 periods；
C(t2)：T2 moment gas concentrations；
VCombustion：Burned out area volume.
Beneficial effects of the present invention：
Can direct measuring go out the volume size of underground burned out area, it is simple to operate, calculate easily, cost it is not high, can be to normal
Rule do not consider that the burned out area volume that rock stratum dilatancy is calculated is verified.
On the premise of burned out area scale is known, negative pressure filling is carried out to the burned out area of necessary or desirable filling, is easy to the palm
While controlling filler quantity and cost, the complete closed filling of underground burned out area is realized.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is present invention injection search gas schematic diagram
Fig. 2 is burned out area filling schematic diagram of the present invention
1- air admission holes, 2- ventholes, 3- bend of stratas band, 4- stratum fissure zone, 5- burned out area, 6- caving rocks and coal ash
Slag, 7- search gas release device, 8- search gas collection device, 9- slip castings facility and slurries, 10- exhausting facilities
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The present invention proposes that after the completion of underground coal resource is by gasification each air admission hole stops air inlet, each venthole aperture base
When originally there is no outlet pressure, detection underground gasification area gas background value is first collected, the stability of some search gas is recycled,
A certain air admission hole is passed through after the search gas in other each ventholes collections, detection gas componant, after being handled by calculating
Go out the volume size of underground burned out area.In view of the lime-ash of adjoining rock dilatancy and different coal remaining after combustion after heated
Amount, typically when the burned out area volume that measuring and calculating is drawn is more than pass through Coal-fired capacity and mixed gas calculation volume 1/3, is just adopted
With former air admission hole slip casting, former venthole exhausting is filled in the way of forming negative pressure to underground burned out area.The present invention is applied to
Underground coal gasification combustion space area volume size detection and filling.
After the completion of coal resources gasification, underground burned out area 5 is formed, its bottom is covered by caving rock and coal ash 6, its
Cap rock layer is sequentially distributed fissure zone 4 and curved bel 3.
Each air admission hole stops air inlet, when each venthole aperture does not have outlet pressure, collects detection underground gas background value.
In the aperture of air admission hole 1, connection search gas release device 7, search gas collection device 8 is connected in venthole 2,
Air admission hole injects radio isotope search gas or stable isotope search gas using the method for pulse release, and gas shows
Track agent is with 300cm3/ min or so speed injection, makes concentration of the injection tracer in coal seam gas reach 150mg/L or so.
Outlet monitoring is carried out using relevant devices such as gamma-ray tool or gamma spectrometers, trace gas concentration t occurs1
When, continue monitoring and 2-3 peak concentration occur to t2When, according to mass conservation law, the search gas quality of injection is equal to t1Arrive
t2The search gas quality and t of discharge in period2Search gas quality sum in moment burned out area, i.e.,：
M=M1+C(t2)VCombustion
In formula：
M：Inject gas gross mass；
M1：t1To t2The gaseous mass of discharge in period；
C(t2)：t2Moment gas concentration；
VCombustion：Burned out area volume.
So：
When the burned out area volume that measuring and calculating is drawn is more than pass through Coal-fired capacity and mixed gas calculation volume 1/3, or
Person adopts and burned out area is filled with the following method according to production requirement.
Slip casting facility and the injection slurries of slurries 9 are installed in air admission hole, exhausting facility 10 is installed in venthole aperture, makes underground
Negative pressure is formed in dead zone, beneficial to the filling to fissure zone.
Injecting paste material can be according to local resource, from lower-cost CL-C types clay cement grout or cement and flying ash grout
Liquid, or lotion slurry, Paste-like body slurry and biliquid combined casting material.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (7)
1. a kind of underground burned out area volume is determined and placement method, it is characterised in that including：
Detection underground gasification area gas background value is collected in step S1, gasification after terminating；
Step S2, collects in other each ventholes after a certain air admission hole is passed through search gas and detects gas componant；
Step S3, by the volume for calculating underground burned out area；
Step S4, measuring and calculating the burned out area volume drawn and the numerical value that conventionally calculation is drawn are compared, more than certain scale or
According to demand, then step S5 is carried out；
Step S5, venthole exhausting formation negative pressure, air admission hole slip casting is quantitatively filled.
2. burned out area volume in underground according to claim 1 is determined and placement method, it is characterised in that step S1, respectively enter
Stomata stops air inlet, when each venthole aperture does not have outlet pressure, collects detection underground gas background value.
3. burned out area volume in underground according to claim 1 is determined and placement method, it is characterised in that step S2, entering
Pore openings connect search gas release device, connect search gas collection device in venthole, are released in air admission hole using pulse
The method injection radio isotope search gas or stable isotope search gas put, gas tracer is with 300cm3/min
Speed injection, concentration of the injection tracer in coal seam gas is reached 150mg/L.
4. burned out area volume in underground according to claim 1 is determined and placement method, it is characterised in that step S5, going out
Pore openings install exhausting facility.
5. burned out area volume in underground according to claim 1 is determined and placement method, it is characterised in that step S5, slip casting
Material selection CL-C types clay cement grout, Cement fly ash, lotion slurry, Paste-like body slurry or biliquid combined casting material.
6. burned out area volume in underground according to claim 1 is determined and placement method, it is characterised in that step S4, work as survey
When the burned out area volume drawn is more than pass through Coal-fired capacity and mixed gas calculation volume 1/3, burned out area is filled
Fill out.
7. burned out area volume in underground according to claim 1 is determined and placement method, it is characterised in that step S3, utilize
Gamma-ray tool or gamma spectrometer carry out outlet monitoring, when there is trace gas concentration t1, continue monitoring and 2-3 peak value occur
Calculated when concentration is to t2
In formula：
M：Inject gas gross mass；
M1：The gaseous mass of discharge in t1 to the t2 periods；
C(t2)：T2 moment gas concentrations；
VCombustion：Burned out area volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710462088.2A CN107313803B (en) | 2017-06-16 | 2017-06-16 | Underground combustion space area volume determination and filling method |
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| CN201710462088.2A CN107313803B (en) | 2017-06-16 | 2017-06-16 | Underground combustion space area volume determination and filling method |
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| CN107313803A true CN107313803A (en) | 2017-11-03 |
| CN107313803B CN107313803B (en) | 2020-06-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU924412A2 (en) * | 1980-10-01 | 1982-04-30 | Всесоюзный научно-исследовательский институт золота и редких металлов | Method for filling worked space |
| US4968187A (en) * | 1988-03-01 | 1990-11-06 | Mackenzie Burnett | System for backfilling a subterranean void |
| CN102607663A (en) * | 2011-11-30 | 2012-07-25 | 新奥气化采煤有限公司 | Underground cavity volume detection method and underground cavity volume detection device |
| CN104514577A (en) * | 2014-12-12 | 2015-04-15 | 中国矿业大学 | Method for efficiently treating spontaneous ignition of remaining coal in large area goaf of shallow-buried coal bed |
-
2017
- 2017-06-16 CN CN201710462088.2A patent/CN107313803B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU924412A2 (en) * | 1980-10-01 | 1982-04-30 | Всесоюзный научно-исследовательский институт золота и редких металлов | Method for filling worked space |
| US4968187A (en) * | 1988-03-01 | 1990-11-06 | Mackenzie Burnett | System for backfilling a subterranean void |
| CN102607663A (en) * | 2011-11-30 | 2012-07-25 | 新奥气化采煤有限公司 | Underground cavity volume detection method and underground cavity volume detection device |
| CN104514577A (en) * | 2014-12-12 | 2015-04-15 | 中国矿业大学 | Method for efficiently treating spontaneous ignition of remaining coal in large area goaf of shallow-buried coal bed |
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