CN206860157U - A kind of device using supercritical carbon dioxide displacement coal-bed gas - Google Patents
A kind of device using supercritical carbon dioxide displacement coal-bed gas Download PDFInfo
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- CN206860157U CN206860157U CN201720449389.7U CN201720449389U CN206860157U CN 206860157 U CN206860157 U CN 206860157U CN 201720449389 U CN201720449389 U CN 201720449389U CN 206860157 U CN206860157 U CN 206860157U
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- carbon dioxide
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- bed gas
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- 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
Abstract
The utility model discloses a kind of device using 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 utility model can avoid supercritical carbon dioxide energy loss, ensure the last supercritical carbon dioxide state for being injected into coal seam, it is simple in construction, it is easy to use, construction is easy, cost is cheap, safe and efficient, and applies supercritical carbon dioxide in coal-bed gas exploitation suitable for a wide range of industrialization, improve coal seam permeability, improve coal-bed gas coefficient of mining.
Description
Technical field
Coal-seam Gas Recovery Technologies field is the utility model is related to, it is more particularly to a kind of to utilize supercritical carbon dioxide displacement coal
The device of layer gas.
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 are very abundant 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 high-quality clean Gas Energy Source.However, because China coal seam is low permeability coal seam mostly, cause watt
This coefficient of mining is low.
Currently used gas pumping mode is：Intensive gas suction by drilling, hydrofracturing are taken out, hydraulic flushing in hole is taken out, exploit
Protective Coal Seam strengthens 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 can not solve the problem of China's coal seam permeability is low, and coal bed gas extraction rate is low.
Supercritical liquid extraction technique is the new science and technology to grow up in the last thirty years, and supercritical carbon dioxide is made
It is widely used in extraction process for a kind of good organic solvent, and good physicochemical properties.Carbon dioxide critical is close
Spend for 0.448g/cm3, be 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, vast technical staff both at home and abroad, which acts on supercritical carbon dioxide, has carried out various experiments on coal, draw
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 account for
The conclusion of ratio.
Although by various experiments, we be realised that the effect that supercritical carbon dioxide is acted 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 supercritical carbon dioxide bar for being finally injected into coal seam
Part does not reach, therefore up to now still without the dress by a wide range of industrial applications of supercritical carbon dioxide in coal-bed gas exploitation
Appearance is put, therefore, how to avoid supercritical carbon dioxide energy loss, ensures the last supercritical carbon dioxide for being injected into coal seam
State, it is that current coal bed gas is opened supercritical carbon dioxide is industrialized safe and efficient apply in coal-bed gas exploitation on a large scale
Adopt the important research topic of technical field.
Utility model content
Technical problem to be solved in the utility model is, there is provided one kind utilizes supercritical carbon dioxide displacement coal seam watt
This device；The utility model can avoid supercritical carbon dioxide energy loss, and guarantee is finally injected into the overcritical of coal seam
The state of carbon dioxide, and it is simple in construction, construction is easy, and cost is cheap, safe and efficient, will be overcritical suitable for a wide range of industrialization
Carbon Dioxide Application improves coal seam permeability in coal-bed gas exploitation, improves coal-bed gas recovery ratio.
In order to solve the above-mentioned technical problem, one kind provided by the utility model utilizes supercritical carbon dioxide displacement coal seam watt
This device, including displacement coal-bed gas device body, the displacement coal-bed gas device body include upper Capsules group and lower glue
Capsule 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
Supercritical carbon dioxide radiation area is provided between lower Capsules group.
Further to improve, above-mentioned upper Capsules group includes the capsule I and capsule II 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 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, which prepares supercritical carbon dioxide and changes to underground, prepares supercritical carbon dioxide, changes traditional ground and prepares overcritical two
Carbonoxide reinjects the thought in coal seam, innovative that supercritical carbon dioxide is prepared in underground and is directly injected into coal seam, keeps away
Exempt from supercritical carbon dioxide energy loss, ensure the state of the last supercritical carbon dioxide for being injected into 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
It is heating source rather than large-scale heater as heating source, reason one is cheap, second, simple in construction, third, saving empty
Between, fourth, being easier to realize the purpose that supercritical carbon dioxide is prepared in underground using phase-change heat-storage material pipe；Temperature is higher, heat
Loss is faster, the easier generation for influenceing 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, and the pressure for the supercritical carbon dioxide for ensureing to enter coal seam is 8MPa.
Further to improve, above-mentioned level pressure relief valve has 1 ~ 3, and level pressure relief valve is not settable excessive, can excessively draw
Play some problems, such as triggering conflict 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 this patent being fixed sealing and carries out sealing of hole to drilling
Operation, the Pneumatic booster pump are used for being carbon dioxide pressurization, and 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 maintains.
The utility model has the advantages that：
The utility model is to have changed traditional ground to prepare the thought that supercritical carbon dioxide reinjects coal seam, innovative
Supercritical carbon dioxide is prepared in underground and is directly injected into coal seam, avoid supercritical carbon dioxide energy loss, protect
The last supercritical carbon dioxide state for being injected into coal seam of card, the utility model are sealed using upper Capsules group and lower Capsules group
The pressure of supercritical carbon dioxide is maintained, ensures the state of supercritical carbon dioxide, is carried out using slip casting area I and slip casting area II close
Sealing is determined, and ensures that supercritical carbon dioxide fully contacts with coal, carbon dioxide is heated into safety using phase-change heat-storage material pipe
45 °C~70 °C of temperature, avoid the accident such as coal body spontaneous combustion or gas explosion caused by excessive temperature, the letter of the utility model structure
Single, construction is easy, suitable for a wide range of industrial applications, safely and efficiently can apply supercritical carbon dioxide and be opened in coal-bed gas
Adopt, improve coal seam permeability, improve coal-bed gas coefficient of mining.
Brief description of the drawings
Fig. 1 is the utility model structure diagram；
Shown in figure：1- drills；2- capsules I；3- capsule IIs；4- capsules III；5- capsules IV；6- slip castings area I；7- is overcritical
Carbon dioxide radiation area；8- slip castings area II；9- phase-change heat-storage material pipes；91- supercritical carbon dioxide air cavitys；92- level pressure pressure releases
Valve；10- is mining hole-sealing grouting pump；101- Grouting Pipes；11- Pneumatic booster pumps；12- carbon dioxide cylinders；13- Manual water injections
Pump；14- coal seams.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type is described in further detail.
As shown in figure 1, a kind of device using 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
Starch 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 include 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 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
For phase-change heat-storage material pipe 9, supercritical carbon dioxide air cavity 91, the phase transformation storage are 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 there are 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 note manually
Water pump 13 is connected with the capsule I 2, capsule II 3, capsule III 4 and capsule IV 5.
Supercritical carbon dioxide occurs extraction, competitive Adsorption metathesis after entering coal seam, filters absorption and replace and make
With, energization driving effect, pressure break effect and reduce partial pressure and act on, improve the porosity of coal, widen the seepage channel of coal-bed gas,
The permeability in coal seam is improved, displacement coal-bed gas, improves coal bed gas extraction rate；
1）Extraction：The relatively low hydrocarbon of polarity and lipoid organic compound are extracted by supercritical carbon dioxide in coal
Take out；
2）Competitive Adsorption metathesis and filtering absorption metathesis：Coal compares gas to the adsorption capacity of carbon dioxide
Adsorption capacity is strong, and competitive Adsorption metathesis occurs for the gas on supercritical carbon dioxide and matrix of coal micropore surface and filtering is inhaled
Attached metathesis；
3）Energization driving effect：Gas in supercritical carbon dioxide driving coal seam hole；
4）Pressure break acts on：Supercritical carbon dioxide increases coal seam porosity, coal seam pore communication is made in gases at high pressure
Strengthened under, the seepage channel of gas increases, and then pressure break acts on；
5）Reduce partial pressure effect：The gas on matrix of coal micropore surface is diffused into after supercritical carbon dioxide displacement desorption
Coal inlet hole Fracture Networks, cause pressure differential inside and outside matrix of coal be present, because the presence of pressure differential causes internal high pressure gas
Gradually persistently desorbed after decompression.
The relatively low hydrocarbon of polarity and lipoid organic compound in coal, such as ester, ether, interior lipid, epoxide
It can be come out in the range of 7 ~ 10MPa lower pressures by supercritical carbon dioxide extracting, 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 improves, and knows and oozes
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 is by supercritical carbon dioxide extracting, as air-flow is from coal
The seepage channel outflow of layer gas, coal hole crack's volume increased number increase, and the seepage channel of coal-bed gas broadens, coal seam
Permeability improves, and because barometric gradient coal-bed gas produces 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
The property of two kinds of phases of liquid, the supercritical carbon dioxide of gaseous state identity are competitively adsorbed with coal-bed gas, reach further
Methane gas of the absorption on matrix of coal micropore surface is 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 utility model is not restricted to the described embodiments, above-described embodiment and
Simply illustrate principle of the present utility model described in specification, on the premise of the spirit and scope of the utility model is not departed from,
The utility model also has various changes and modifications, and these changes and improvements both fall within claimed the scope of the utility model
It is interior.
Claims (4)
- A kind of 1. device using supercritical carbon dioxide displacement coal-bed gas, it is characterised in that：Filled including displacement coal-bed gas 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 Starch 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；Heater is provided with the supercritical carbon dioxide radiation area, the heater is phase-change thermal storage material Expects pipe, supercritical carbon dioxide air cavity is provided with the phase-change heat-storage material pipe, is provided with the phase-change heat-storage material pipe Level pressure relief valve.
- 2. the device according to claim 1 using supercritical carbon dioxide displacement coal-bed gas, it is characterised in that：It is described Upper Capsules group includes the capsule I and capsule II 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 set gradually, and slip casting area II is provided between the capsule III and capsule IV.
- 3. the device according to claim 1 using supercritical carbon dioxide displacement coal-bed gas, it is characterised in that：It is described Level pressure relief valve has 1 ~ 3.
- 4. the device according to claim 1 using supercritical carbon dioxide displacement coal-bed gas, 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 are 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720449389.7U CN206860157U (en) | 2017-04-26 | 2017-04-26 | A kind of device using supercritical carbon dioxide displacement coal-bed gas |
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| CN201720449389.7U CN206860157U (en) | 2017-04-26 | 2017-04-26 | A kind of device using supercritical carbon dioxide displacement coal-bed gas |
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| CN206860157U true CN206860157U (en) | 2018-01-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106894799A (en) * | 2017-04-26 | 2017-06-27 | 华北科技学院 | A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas |
| CN114060029A (en) * | 2021-10-19 | 2022-02-18 | 煤炭科学研究总院 | Deep coal seam permeability increasing method |
-
2017
- 2017-04-26 CN CN201720449389.7U patent/CN206860157U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106894799A (en) * | 2017-04-26 | 2017-06-27 | 华北科技学院 | A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas |
| CN114060029A (en) * | 2021-10-19 | 2022-02-18 | 煤炭科学研究总院 | Deep coal seam permeability increasing method |
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