CN106894799A - A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas - Google Patents
A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas Download PDFInfo
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- CN106894799A CN106894799A CN201710283930.6A CN201710283930A CN106894799A CN 106894799 A CN106894799 A CN 106894799A CN 201710283930 A CN201710283930 A CN 201710283930A CN 106894799 A CN106894799 A CN 106894799A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 238
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 117
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 117
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002775 capsule Substances 0.000 claims abstract description 126
- 239000003245 coal Substances 0.000 claims abstract description 74
- 238000007569 slipcasting Methods 0.000 claims abstract description 28
- 230000005855 radiation Effects 0.000 claims abstract description 18
- 238000005065 mining Methods 0.000 claims abstract description 11
- 238000005553 drilling Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005338 heat storage Methods 0.000 claims description 13
- 239000011232 storage material Substances 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 241000790917 Dioxys <bee> Species 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 229960004424 carbon dioxide Drugs 0.000 description 92
- 239000007789 gas Substances 0.000 description 65
- 239000011159 matrix material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 5
- 229910002090 carbon oxide Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000005649 metathesis reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 230000002860 competitive effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 150000002894 organic compounds Chemical class 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- -1 tests prove that Chemical compound 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
- E21B43/006—Production of coal-bed methane
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas, belong to Coal-seam Gas Recovery Technologies field, including displacement coal-bed gas device body, the displacement coal-bed gas device body includes upper Capsules group and lower Capsules group, and slip casting area I is provided with the upper Capsules group；Slip casting area II is provided with the lower Capsules group；Supercritical carbon dioxide radiation area is provided between the upper Capsules group and lower Capsules group, the present invention can avoid supercritical carbon dioxide energy loss, ensure the last supercritical carbon dioxide state for being injected into coal seam, simple structure is easy to use, construction is easy, it is with low cost, it is safe and efficient, and be suitable to industrialize on a large scale and apply in coal-bed gas exploitation supercritical carbon dioxide, improve coal seam permeability, improve coal-bed gas coefficient of mining.
Description
Technical field
It is more particularly to a kind of using supercritical carbon dioxide displacement coal seam watt the present invention relates to Coal-seam Gas Recovery Technologies field
This device and method.
Background technology
Coal bed gas is commonly called as " gas ", and main component is methane, is the gas of the association in the generation of coal and metamorphic process, its
Reserves enrich very much in China.Coal-bed gas calorific value is suitable with conventional gas, is 2 times to 5 times of general coal gas, burning
Pollutant is seldom produced afterwards, belongs to the high-quality clean gas energy.However, because China coal seam is mostly low permeability coal seam, cause watt
This coefficient of mining is low.
Conventional gas pumping mode is at present：Intensive gas suction by drilling, hydrofracturing are taken out, hydraulic flushing in hole is taken out, exploit
Protective Coal Seam reinforcing extraction, hydraulic slotted liner technique extraction etc..But these prior arts are for improving the effect of gas permeability of coal seam aspect less, root
Originally China's coal seam permeability can not be solved low, the low problem of coal bed gas extraction rate.
Supercritical liquid extraction technique is the new science and technology for growing up in the last thirty years, and supercritical carbon dioxide is made
For a kind of good organic solvent, and good physicochemical properties are widely used in extraction process.Carbon dioxide critical is close
It is 0.448g/cm3 to spend, and is highest in conventional supercritical fluid, and the solvability of supercritical fluid is with fluid density
Increase and increase, this just illustrates that supercritical carbon dioxide has the powerful extracting power to organic matter.In view of overcritical dioxy
Change the particularity of carbon, supercritical carbon dioxide is acted on and various experiments have been carried out on coal, drawn by vast domestic and international technical staff
When supercritical carbon dioxide is used as the power gas of displacement coal-bed gas, the part organic matter in matrix of coal is can dissolve,
Coal seam porosity is improved, improves low permeability coal seam, the gas on displacement matrix of coal micropore surface improves coal-bed gas free state and accounts for
The conclusion of ratio.
Although by various experiments, we be realised that supercritical carbon dioxide acts on the effect on coal, prepare super
Critical carbon dioxide simultaneously injects the technology in coal seam and still suffers from many problems, and coal is reinjected because ground prepares supercritical carbon dioxide
Layer, injection period supercritical carbon dioxide energy can produce loss, cause the last supercritical carbon dioxide bar for being injected into coal seam
Part is not reached, thus up to now still without by supercritical carbon dioxide on a large scale industrial applications coal-bed gas exploitation on dress
Appearance is put, therefore, how to avoid supercritical carbon dioxide energy loss, it is ensured that be finally injected into the supercritical carbon dioxide in coal seam
State, make supercritical carbon dioxide industrialize on a large scale safely and efficiently apply coal-bed gas exploitation on be that current coal bed gas is opened
Adopt the important research topic of technical field.
The content of the invention
The technical problems to be solved by the invention are, there is provided a kind of utilization supercritical carbon dioxide displacement coal-bed gas
Device and method；The present invention can avoid supercritical carbon dioxide energy loss, it is ensured that finally be injected into overcritical the two of coal seam
The state of carbonoxide, and simple structure, construction are easy, with low cost, safe and efficient, are suitable to industrialize overcritical two on a large scale
Carbonoxide is applied in coal-bed gas exploitation, improves coal seam permeability, improves coal-bed gas recovery ratio.
In order to solve the above-mentioned technical problem, a kind of utilization supercritical carbon dioxide displacement coal-bed gas that the present invention is provided
Device, including displacement coal-bed gas device body, the displacement coal-bed gas device body include upper Capsules group and lower Capsules group,
Slip casting area I is provided with the upper Capsules group；Slip casting area II is provided with the lower Capsules group；The upper Capsules group and lower capsule
Supercritical carbon dioxide radiation area is provided between group.
Further to improve, above-mentioned upper Capsules group includes the capsule I and capsule II that set gradually, the capsule I and capsule
Slip casting area I is provided between II；The lower Capsules group includes the capsule III and capsule IV that set gradually, the capsule III and capsule
Slip casting area II is provided between IV；Heater is provided with the supercritical carbon dioxide radiation area, this design will be traditional
Ground prepares supercritical carbon dioxide and changes to underground and prepares supercritical carbon dioxide, changes traditional ground and prepares overcritical two
Carbonoxide reinjects the thought in coal seam, and preparing supercritical carbon dioxide in underground and being directly injected into coal seam for novelty keeps away
Supercritical carbon dioxide energy loss is exempted from, it is ensured that be finally injected into the state of the supercritical carbon dioxide in coal seam.
Further to improve, above-mentioned heater is phase-change heat-storage material pipe, is provided with the phase-change heat-storage material pipe
Supercritical carbon dioxide air cavity, level pressure relief valve is provided with the phase-change heat-storage material pipe, is made using phase-change heat-storage material pipe
For heating source rather than large-scale heater as heating source, reason one is cheap, and two is simple structure, and three is to save empty
Between, four is to be easier to realize preparing the purpose of supercritical carbon dioxide in underground using phase-change heat-storage material pipe；Temperature is higher, heat
Loss is faster, the generation of easier influence supercritical carbon dioxide, tests prove that, carbon dioxide is heated to 45 °C~70 °C,
It is the optimum temperature for generating supercritical carbon dioxide；When supercritical carbon dioxide pressure is equal to 8MPa, phase-change heat-storage material pipe
Level pressure relief valve automatically turn on, supercritical carbon dioxide is released and enters coal seam, using level pressure relief valve to that will enter
The pressure of the supercritical carbon dioxide in coal seam is determined, it is ensured that the pressure for entering the supercritical carbon dioxide in coal seam is 8MPa.
Further to improve, above-mentioned level pressure relief valve has 1 ~ 3, and level pressure relief valve not can be set excessively, can excessively draw
Play some problems, such as triggering is contradicted etc..
Further to improve, above-mentioned displacement coal-bed gas device body is communicated with pump, and the pump includes mining hole-sealing grouting
Pump, Pneumatic booster pump and Manual water injection pump；The mining hole-sealing grouting pump is connected with the slip casting area I and slip casting area II；Institute
The input port for stating Pneumatic booster pump is communicated with carbon dioxide cylinder, the delivery outlet of Pneumatic booster pump and the overcritical titanium dioxide
Carbon air cavity is connected；The Manual water injection pump is connected with the capsule I, capsule II, capsule III and capsule IV, the mining envelope
Hole grouting pump is used for injecting cement mortar for this patent, and cement mortar is used for being fixed this patent sealing and carries out sealing of hole to drilling
Operation, the Pneumatic booster pump is used for being carbon dioxide pressurization that the Manual water injection pump is used for injecting water for this patent, and water is to this
Patent carries out seal operation and the air pressure to bore inner is maintained.
A kind of method of utilization supercritical carbon dioxide displacement coal-bed gas, comprises the following steps：
（1）Drilled in coal seam；
（2）Capsules group and upper Capsules group under being installed in drilling, the cavity between upper Capsules group and lower Capsules group form overcritical
Carbon dioxide radiation area, upper Capsules group includes the capsule I and capsule II that set gradually, and lower Capsules group includes the capsule for setting gradually
III and capsule IV；
（3）To capsule I, capsule II, capsule III and water filling in capsule IV；To slip casting between capsule I and capsule II, to the He of capsule III
Slip casting between capsule IV；
（4）To the heater conveying high-pressure carbon dioxide in supercritical carbon dioxide radiation area, supercritical carbon dioxide is obtained,
Supercritical carbon dioxide discharges from supercritical carbon dioxide radiation area and enters coal seam；The present invention is in supercritical carbon dioxide radiation
In supercritical carbon dioxide being prepared in area and it directly diffusing to coal seam, it is to avoid in ground generation supercritical carbon dioxide again
The energy loss imported during coal seam；
（5）Stand, supercritical carbon dioxide is fully spread in coal seam；
（6）The extraction of coal-bed gas is carried out using gas pumping pipe.
It is further to improve, above-mentioned steps（1）The diameter of middle drilling be 60 mm ~ 113mm, drilling depth more than etc.
In 10m, drilling axis is -5 ° ~ 5 ° with the angle of horizontal plane, and supercritical carbon dioxide is that a kind of liquid and gaseous state coexist, so
Should level it is horizontal or be slightly inclined horizontal.
It is further to improve, above-mentioned steps（3）The pressure of middle noted water is more than or equal to 9MPa.
It is further to improve, above-mentioned steps（4）The pressure of mesohigh carbon dioxide is more than 8MPa；Step（4）In be released
Supercritical carbon dioxide pressure be equal to 8MPa, temperature be 45 °C~70 °C.
It is further to improve, above-mentioned steps（1）In drilling and the step（6）In gas pumping pipe interval 2 meters ~ 3
Rice is alternately arranged, and according to the scope of present invention influence, drilling is alternately arranged with gas pumping pipe, improves coal-bed gas harvesting
Rate.
The present invention has the advantages that：
The present invention is to have changed traditional ground to prepare the thought that supercritical carbon dioxide reinjects coal seam, novelty in underground
Prepare supercritical carbon dioxide and be directly injected into coal seam, it is to avoid supercritical carbon dioxide energy loss, it is ensured that last quilt
The supercritical carbon dioxide state in coal seam is injected, the present invention carries out sealing and maintains overcritical two using upper Capsules group and lower Capsules group
The pressure of carbonoxide, it is ensured that the state of supercritical carbon dioxide, sealing fixation is carried out using slip casting area I and slip casting area II, it is ensured that
Supercritical carbon dioxide is fully contacted with coal, using phase-change heat-storage material pipe by carbon dioxide be heated to 45 °C of safe temperature~
70 °C, it is to avoid the accident such as coal body spontaneous combustion or gas explosion for causing by excessive temperature, simple structure of the present invention, construction is easy, fits
In industrial applications on a large scale, safely and efficiently supercritical carbon dioxide can be applied in coal-bed gas exploitation, improve coal seam
Permeability, improves coal-bed gas coefficient of mining.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is present invention drilling and gas pumping pipe position schematic diagram；
Shown in figure：1- drills；2- capsules I；3- capsule IIs；4- capsules III；5- capsules IV；6- slip castings area I；The overcritical dioxies of 7-
Change carbon radiation area；8- slip castings area II；9- phase-change heat-storage material pipes；91- supercritical carbon dioxide air cavitys；92- level pressure relief valves；
10- is mining hole-sealing grouting pump；101- Grouting Pipes；11- Pneumatic booster pumps；12- carbon dioxide cylinders；13- Manual water injection pumps；
14- coal seams；15- gas pumping pipes.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made further below in conjunction with accompanying drawing
Describe in detail.
As illustrated, a kind of device of utilization supercritical carbon dioxide displacement coal-bed gas, including displacement coal-bed gas dress
Body is put, the displacement coal-bed gas device body includes upper Capsules group and lower Capsules group, note is provided with the upper Capsules group
Slurry area I 6；Slip casting area II 8 is provided with the lower Capsules group；Overcritical two are provided between the upper Capsules group and lower Capsules group
Carbonoxide radiation area 7, the upper Capsules group includes the capsule I 2 and capsule II 3 that set gradually, the capsule I 2 and capsule II 3 it
Between be provided with slip casting area I 6；The lower Capsules group includes the capsule III 4 and capsule IV 5 that set gradually, the capsule III 4 and capsule
Slip casting area II 8 is provided between IV 5；Heater, the heater are provided with the supercritical carbon dioxide radiation area 7
It is phase-change heat-storage material pipe 9, supercritical carbon dioxide air cavity 91, the phase transformation storage is provided with the phase-change heat-storage material pipe 9
Level pressure relief valve 92 is provided with hot material pipe 9, the level pressure relief valve 92 has 1 ~ 3, the displacement coal-bed gas device
Body is communicated with pump, and the pump includes mining hole-sealing grouting pump 10, Pneumatic booster pump 11 and Manual water injection pump 13；The mining envelope
Hole grouting pump 10 is connected with the slip casting area I 6 and slip casting area II 8；The input port of the Pneumatic booster pump 11 is communicated with dioxy
Change carbon gas bomb 12, the delivery outlet of Pneumatic booster pump 11 is connected with the supercritical carbon dioxide air cavity 91；The manual note
Water pump 13 is connected with the capsule I 2, capsule II 3, capsule III 4 and capsule IV 5.
A kind of method of utilization supercritical carbon dioxide displacement coal-bed gas, comprises the following steps：
（1）Drilled in coal seam；
（2）Capsules group and upper Capsules group under being installed in drilling, the cavity between upper Capsules group and lower Capsules group form overcritical
Carbon dioxide radiation area, upper Capsules group includes the capsule I and capsule II that set gradually, and lower Capsules group includes the capsule for setting gradually
III and capsule IV；
（3）To capsule I, capsule II, capsule III and water filling in capsule IV；To slip casting between capsule I and capsule II, to the He of capsule III
Slip casting between capsule IV；
（4）To the heater conveying high-pressure carbon dioxide in supercritical carbon dioxide radiation area, supercritical carbon dioxide is obtained,
Supercritical carbon dioxide discharges from supercritical carbon dioxide radiation area and enters coal seam；
（5）Stand, supercritical carbon dioxide is fully spread in coal seam；
（6）The extraction of coal-bed gas is carried out using gas pumping pipe.
The step（1）The diameter of middle drilling is 60 mm ~ 113mm, and drilling depth is more than or equal to 10m, bore hole axis
Line is -5 ° ~ 5 °, the step with the angle of horizontal plane（3）The pressure of middle noted water is more than or equal to 9MPa, the step（4）
The pressure of mesohigh carbon dioxide is more than 8MPa；Step（4）In the pressure of supercritical carbon dioxide that is released be equal to 8MPa, temperature
Spend is 45 °C~70 °C, the step（1）In drilling and the step（6）In gas pumping pipe be spaced 2 meters ~ 3 meters alternatings
Arrangement.
There is extraction, competitive Adsorption metathesis after entering coal seam, filter absorption and replace and make in supercritical carbon dioxide
With, energization driving effect, pressure break act on and reduce partial pressure act on, improve coal porosity, widen the seepage channel of coal-bed gas,
The permeability in coal seam is improved, displacement coal-bed gas improve coal bed gas extraction rate；
1）Extraction：The relatively low hydrocarbon of polarity and lipoid organic compound are gone out by supercritical carbon dioxide extracting in coal
Come；
2）Competitive Adsorption metathesis and filtering absorption metathesis：Coal compares the absorption of gas to the adsorption capacity of carbon dioxide
Ability is strong, and competitive Adsorption metathesis occurs with the gas on matrix of coal micropore surface for supercritical carbon dioxide and filtering absorption is put
The effect of changing；
3）Energization driving effect：Supercritical carbon dioxide drives the gas in the hole of coal seam；
4）Pressure break is acted on：Supercritical carbon dioxide increase coal seam porosity, make coal seam pore communication gases at high pressure effect under
Obtain enhanced, the seepage channel of gas increases, and then reach pressure break effect；
5）Reduce partial pressure effect：The gas on matrix of coal micropore surface is diffused into coal after supercritical carbon dioxide displacement desorption
Hole hole Fracture Networks, cause the presence of pressure differential inside and outside matrix of coal, because the presence of pressure differential causes internal high pressure gas gradually
Persistently desorbed after step-down.
The relatively low hydrocarbon of polarity and lipoid organic compound in coal, such as ester, ether, interior lipid, epoxide
Can in the range of 7 ~ 10MPa lower pressures by supercritical carbon dioxide extracting out, the polarity in matrix of coal or coal hole crack
Relatively low hydrocarbon and esters organic compound are just dissolved in this course, and then the porosity of coal is improved, and is known and is oozed
The relation of rate and porosity is thoroughly：
k0=n3 0/c（1-n0）2S2,
In formula, k0-- permeabilities, D,
N0-- porositys,
S -- coal specific surface area,
C -- dimensionless constant coefficient.
Part organic compound in matrix of coal or coal hole crack by supercritical carbon dioxide extracting, with air-flow from coal
The seepage channel outflow of layer gas, coal hole crack's volume increased number increases, and the seepage channel of coal-bed gas broadens, coal seam
Permeability is improved, and because barometric gradient coal-bed gas produce desorption, adsorbs the gas on matrix of coal micropore surface by adsorbing
State is changed into free state.
Coal is 2 times~8 times of gas to the adsorbance of carbon dioxide, the supercritical carbon dioxide possess simultaneously gas and
Two kinds of properties of phase of liquid, supercritical carbon dioxide and the coal-bed gas of gaseous state identity are competitively adsorbed, and are reached further
Methane gas of the absorption on matrix of coal micropore surface are promoted to desorb, and the supercritical carbon dioxide is with gaseous state phase and liquid
The property of phase flows in seepage channel simultaneously, promotes coal-bed gas to carry out seepage flow at faster speed.
It should be understood by those skilled in the art that, the present invention is not limited to the above embodiments, above-described embodiment and explanation
Merely illustrating the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also has
Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.
Claims (10)
1. a kind of device of utilization supercritical carbon dioxide displacement coal-bed gas, it is characterised in that：Including displacement coal-bed gas dress
Body is put, the displacement coal-bed gas device body includes upper Capsules group and lower Capsules group, note is provided with the upper Capsules group
Slurry area I；Slip casting area II is provided with the lower Capsules group；Overcritical dioxy is provided between the upper Capsules group and lower Capsules group
Change carbon radiation area.
2. the device of utilization supercritical carbon dioxide displacement coal-bed gas according to claim 1, it is characterised in that：It is described
Upper Capsules group includes the capsule I and capsule II that set gradually, and slip casting area I is provided between the capsule I and capsule II；Under described
Capsules group includes the capsule III and capsule IV that set gradually, and slip casting area II is provided between the capsule III and capsule IV；It is described
Heater is provided with supercritical carbon dioxide radiation area.
3. the device of utilization supercritical carbon dioxide displacement coal-bed gas according to claim 2, it is characterised in that：It is described
Heater is phase-change heat-storage material pipe, and supercritical carbon dioxide air cavity, the phase are provided with the phase-change heat-storage material pipe
Level pressure relief valve is provided with change heat storage material pipe.
4. the device of utilization supercritical carbon dioxide displacement coal-bed gas according to claim 3, it is characterised in that：It is described
Level pressure relief valve has 1 ~ 3.
5. the device of utilization supercritical carbon dioxide displacement coal-bed gas according to claim 3, it is characterised in that：It is described
Displacement coal-bed gas device body is communicated with pump, and the pump includes mining hole-sealing grouting pump, Pneumatic booster pump and Manual water injection pump；
The mining hole-sealing grouting pump is connected with the slip casting area I and slip casting area II；The input port of the Pneumatic booster pump is communicated with
Carbon dioxide cylinder, the delivery outlet of Pneumatic booster pump is connected with the supercritical carbon dioxide air cavity；The Manual water injection
Pump is connected with the capsule I, capsule II, capsule III and capsule IV.
6. a kind of method of utilization supercritical carbon dioxide displacement coal-bed gas, comprises the following steps：
（1）Drilled in coal seam；
（2）Capsules group and upper Capsules group under being installed in drilling, the cavity between upper Capsules group and lower Capsules group form overcritical
Carbon dioxide radiation area, upper Capsules group includes the capsule I and capsule II that set gradually, and lower Capsules group includes the capsule for setting gradually
III and capsule IV；
（3）To capsule I, capsule II, capsule III and water filling in capsule IV；To slip casting between capsule I and capsule II, to the He of capsule III
Slip casting between capsule IV；
（4）To the heater conveying high-pressure carbon dioxide in supercritical carbon dioxide radiation area, supercritical carbon dioxide is obtained,
Supercritical carbon dioxide discharges from supercritical carbon dioxide radiation area and enters coal seam；
（5）Stand, supercritical carbon dioxide is fully spread in coal seam；
（6）The extraction of coal-bed gas is carried out using gas pumping pipe.
7. the method for utilization supercritical carbon dioxide displacement coal-bed gas according to claim 6, it is characterised in that：It is described
Step（1）The diameter of middle drilling is 60 mm ~ 113mm, and drilling depth is more than or equal to 10m, drilling axis and horizontal plane
Angle is -5 ° ~ 5 °.
8. the method for utilization supercritical carbon dioxide displacement coal-bed gas according to claim 6, it is characterised in that：It is described
Step（3）The pressure of middle noted water is more than or equal to 9MPa.
9. the method for utilization supercritical carbon dioxide displacement coal-bed gas according to claim 6, it is characterised in that：It is described
Step（4）The pressure of mesohigh carbon dioxide is more than 8MPa；Step（4）In the pressure of supercritical carbon dioxide that is released be equal to
8MPa, temperature is 45 °C~70 °C.
10. the method for utilization supercritical carbon dioxide displacement coal-bed gas according to claim 6, it is characterised in that：Institute
State step（1）In drilling and the step（6）In gas pumping pipe be spaced 2 meters ~ 3 meters be alternately arranged.
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