CN107575185A - A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other - Google Patents
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other Download PDFInfo
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- CN107575185A CN107575185A CN201710826220.3A CN201710826220A CN107575185A CN 107575185 A CN107575185 A CN 107575185A CN 201710826220 A CN201710826220 A CN 201710826220A CN 107575185 A CN107575185 A CN 107575185A
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Abstract
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other, belong to unconventionaloil pool production technique field.This method includes：(1) vertical drilling well is carried out from ground, arranges well pattern, the well depth of drilling well is until coal seam, well head number >=2, and in the well pattern of arrangement, at least a bite well is as active well, and other wells are as gas production producing well；(2) thermal source is lowered into coal seam from active well, heat source temperature is adjusted to 380~450 DEG C, and coal seam is heated, and treats coal seam temperature >=350 DEG C, stops heating；(3) by active well, liquid nitrogen is injected into coal seam, the injection rate of liquid nitrogen is according to geological conditions with depending on coal body feature difference, and after liquid nitrogen vaporization, refrigeration terminates；(4) (2) and (3) are repeated repeatedly, allows coal seam to be constantly in the job state that colds and heat succeed each other, in gas production producing well extraction coal bed gas.This method can effectively carry out coal bed gas extraction, accelerate coal bed gas extraction speed and improve extraction rate.
Description
Technical field
The present invention relates to unconventionaloil pool production technique field, is specifically that one kind utilizes the effect extraction that colds and heat succeed each other in underground
The method of coal bed gas.
Background technology
Coal bed gas is a kind of accompanying gas of coal, and main component is methane, and within coal mines, coal bed gas is commonly called as " gas ".
Coal bed gas is a kind of imflammable gas, and it is both a kind of valuable resource, and threatens the maximum hidden danger of Safety of Coal Mine Production.
In mining process, gas is spread out of coal seam, gushed out in the tunnel of mine, when the gas density in tunnel reaches blast circle
Limit, when running into naked light, will result in Gas Explosion Accidents in Coal Mines.Therefore it is taken as a kind of clear energy sources to be exploited and utilized,
The utilization of new energy can be not only realized, but also can effectively prevent that the Gas Outburst in process of coal mining from being triggered
Mine disaster.
At present, the extraction for coal bed gas has a variety of methods, and known main pumping method has：Ground in coal mine roadway
The multi-branched horizontal well extraction technology that lower coal bed drilling drainage method and ground are implemented.This coal seam drilling of underground in coal mine roadway
Hole drainage method is from coal mine down-hole tunnel to coal seam construction drill, and carries out a technology of extraction.The technology mainly drops
Coal bed gas content in low coal seam, ensure the safety in production in colliery.The multi-branched horizontal well extraction technology that ground is implemented is from ground
Towards one drilling of coal seam vertical construction, it is changed into horizontal drilling after drilling into coal seam, and several brills are divided into by a drilling
Hole, form larger extraction scope.The technology is mainly used in ground coal bed gas exploitation.Because coal compares the adsorptivity of methane
By force, the permeability in coal seam is than relatively low, and the reset pressure of coal bed gas is small in coal seam, typically between 0.5MPa -1.0MPa, therefore
No matter the coal bed gas which kind of above-mentioned method all can not be effectively in extraction coal output layer.There is a method in which be displacement technology, the technology
Principle is：Because coal body is higher than methane to the adsorptivity of carbon dioxide, nitrogen, also titanium dioxide is injected in oriented coal seam both at home and abroad
The gases such as carbon, nitrogen, the methane gone out with displacement in coal body.
Coal bed gas belongs to juvenile gas, and it is attracted in the micro-pore in coal body, theoretical according to coal-bed gas exploitation,
Due to the change of coal seam atmospheric pressure, coal bed gas desorb first for dissociate coal bed gas, and gradually by hole and can not seepage flow fine fisssure
Gap is diffused into big crack, and this is the diffusion phase of coal bed gas；Secondly, in the presence of barometric gradient, have high-pressure zone to
Low pressure zone is flowed, and this is the seepage flow stage of coal bed gas.During coal bed gas extraction, this two step is indispensable.For hypotonic
Saturating coal seam, because the seepage flow stage can not be carried out, therefore displacement technology has little effect for coal-bed gas exploitation.
In order to increase permeability of the coal bed gas in coal seam, technology the most frequently used at present is hydrofracturing method, by coal
Layer carries out pressure break, the initial fissure in coal seam is extended, adds the migration pathway of coal bed gas, so as to improve coal bed gas
Production efficiency；But the above method has some limitations, because the influence of some particular surroundings, the effect and efficiency of pressure break are equal
It is not ideal, and China's distribution of water resources is extremely uneven, some regional waters and its shortage, and needed in fracturing process big
The water source supply of amount；After fracturing work is carried out, the fracturing fluid discharged also result in different degrees of influence to environment.
At present, many scholars also studied affecting laws of the temperature to desorption of mash gas speed in coal body both at home and abroad.Experiment hair
Existing temperature can improve the coal bed gas desorption rate in coal body, but the temperature range tested is 30 DEG C -70 DEG C.Its result for
Quickly, high-efficiency mining coal bed gas is not produced and especially influenceed.Therefore, corresponding industrial technology method is not proposed yet.
The content of the invention
It is an object of the invention to overcome the shortcomings of above-mentioned coal bed gas pumping method, there is provided one kind utilizes cold and hot friendship in underground
For the method for effect extraction coal bed gas, this method is to the extraction coal bed gas significant effect in the low permeability coal seam of underground.This method profit
Coal seam is heated with infrared heat source, is then quenched using liquid nitrogen, coal seam initial fissure is extended on a large scale, liquid
Nitrogen vaporizes, and under high temperature action, nitrogen can reduce adsorptivity of the coal to coal bed gas, accelerate the desorption rate of coal bed gas, due to adding
Heat and free gas increase, and increase coal seam atmospheric pressure, meanwhile, after the effect that to coal body cold and heat succeed each other, is produced from coal seam after heating
Raw many new cracks, increase the permeability in coal seam, so as to improve extraction rate and extraction speed, can more effectively carry out coal
Layer gas extraction.This method can effectively carry out coal bed gas extraction, accelerate coal bed gas extraction speed and improve extraction rate.
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other of the present invention, is carried out according to the following steps：
Step 1, a well pattern is established in coal seam
Vertical drilling well is carried out from ground, arranges well pattern, the well depth of drilling well is until coal seam, well head number >=2, vertical drilling enter
Behind coal seam, screen casing sleeve pipe under coal seam section, coal seam is accordingly cemented the well with upper and lower thermal sleeve；
Wherein, in the well pattern of arrangement, at least for a bite well as active well, it act as the implementation effect of colding and heat succeed each other；Other
As gas production producing well, it act as gathering coal bed gas well；
Step 2, heat
Thermal source is lowered into coal seam from active well, heat source temperature is adjusted to 380~450 DEG C, and coal seam is heated, and treats
Coal seam temperature >=350 DEG C, stop heating；
Described thermal source is electromagnetic heat source, and it has instantaneous temperature-raising characteristic；
Step 3, freeze
By active well, inject liquid nitrogen into coal seam, the injection rate of liquid nitrogen it is different with coal body feature according to geological conditions and
Fixed, after liquid nitrogen vaporization, refrigeration terminates；
Step 4, cold and heat succeed each other
Repeat step 2 and more times of step 3, allow coal seam to be constantly in the job state that colds and heat succeed each other, are taken out in gas production producing well
Mining coal seam gas.
In described step 1, described drilling well, its spacing distance is 100~500m, and well pattern arrangement can be with single or more
Row's distribution.
In described step 1, active well is at least one, when active well for it is multiple when, can effectively realize well pattern connection and
Accelerate the harvest efficiency of coal bed gas.
In described step 1, described coal seam is with upper and lower thermal sleeve, overlying strata on the roof specially more than coal seam
Thermal sleeve under interval.
Preferably, in described step 2, described electromagnetic heat source is infrared heat source.
In described step 2, electromagnetic heat source is due to its special electromagnetic property and the characteristic of moment heating, atrament pair
Its heat has preferable absorbability, therefore heat energy can be propagated comparatively fast in coal seam, improves the efficiency of heating surface.
In described step 3, described liquid nitrogen not only has fracturing characteristic to coal seam, and nitrogen can improve coal seam after it is vaporized
The desorption migration efficiency of gas.
In described step 4, described coal seam colds and heat succeed each other in effect, when coal seam permeability is relatively low, when establishing well pattern,
Well pattern does not connect, and in step 4, the activity duration that colds and heat succeed each other in active well is extended, until well pattern connects.
In described step 4, described gas production producing well extraction coal bed gas, specially gas production producing well carry out drainage and step-down
Extraction contains the mixed gas of coal bed gas, then using known mixed gas separation method, you can gaseous coal bed gas is obtained,
Realize that mixed gas separates.
In described step 4, described coal seam colds and heat succeed each other in operation process, and the heating of step 2 and the refrigeration of step 3 are equal
There is Fracturing to coal seam, the effect of colding and heat succeed each other can form dual fracturing effect to coal seam, it is possible to increase the damage effect in coal seam
Rate.
In described step 4, described coal seam colds and heat succeed each other in operation process, in the heating of step 2 and the injection of step 3
Equal no oxygen participates in during liquid nitrogen, can effectively prevent because dieseling occurs in high temperature coal seam.
The method in underground using the effect extraction coal bed gas that colds and heat succeed each other that the present invention uses, its principle is to be reached in coal seam
In the case of a high temperature, liquid nitrogen is added, so as to accelerate the migration rate of the extension of coal seam initial fissure and coal bed gas.Cause
After being heated for coal seam, wherein the gas adsorbed will desorb referred to as free gas rapidly, gas is changed into free shape from adsorbed state
After state, gas volume increases rapidly, and gas pressure increases therewith in coal seam.And the liquid nitrogen injected is to the coal seam in the condition of high temperature
There is a shock chilling function, dual fracturing effect can be realized to coal seam, and vapour can occur in the presence of high temperature for liquid nitrogen
Change, the nitrogen of formation can realize analytic function and acceleration coal seam original to coal bed gas well using its stronger adsorption capacity
The extension in raw crack and the migration rate of coal bed gas.Under the driving effect of nitrogen, coal bed gas of dissociating is rapidly to less than normal pressure
Gas production producing well flowing.Finally, in gas production producing well, using known mixed gas separation method, you can obtain gaseous
Coal bed gas, realize that mixed gas separates.This method can realize the rapid, purpose of high-efficiency mining coal bed gas, accelerate coal bed gas and take out
Speed is adopted, improves extraction rate.
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other of the present invention, compared to prior art, its
Advantage is：
1. the method for the present invention can choose more wells simultaneously as the active well of effect of colding and heat succeed each other is implemented, so as to effectively in fact
Existing well pattern connection and the harvest efficiency for accelerating coal bed gas.
2. the heating of the present invention and refrigeration have Fracturing to coal seam, the effect of colding and heat succeed each other can form dual to coal seam
Fracturing effect, it is possible to increase the damage efficacy in coal seam.
3. the refrigerant that the present invention uses --- liquid nitrogen not only has fracturing characteristic to coal seam, and nitrogen can carry after it is vaporized
The desorption migration efficiency of high coal bed gas.And the aqueous water in existing process has water locking about coal bed gas product, polluted underground water
The shortcomings of with insulating power deficiency, and the present invention is become apparent from using liquid nitrogen frozen effect, and due to its chemical inertness, can and coal
Rock mass contact freezes without destroying coal dielectric property immediately.
4. the infrared heat source that the present invention uses is due to its special electromagnetic property and the characteristic of moment heating, atrament pair
Its heat has preferable absorbability, therefore heat energy can be propagated comparatively fast in coal seam, improves the efficiency of heating surface.Using red
The electromagnetic heat sources such as external heat source, it is heated coal seam, by SEM scanning electron microscope analysis, UNICOM's coal seam hole and development coal seam
Initial fissure effect is extremely obvious.
5. in process of the present invention, no oxygen participates in during heating and injecting liquid nitrogen, can effectively prevent because high
There is dieseling in warm coal seam.
6. the present invention heats by using infrared heat source to coal seam, then it is quenched using liquid nitrogen, makes coal seam former
Raw crack is extended on a large scale, liquid nitrogen vaporization, and under high temperature action, nitrogen can reduce adsorptivity of the coal to coal bed gas, accelerate
The desorption rate of coal bed gas, because heating and free gas increase, coal seam atmospheric pressure is increased, meanwhile, coal body is carried out cold and hot
Coal seam produces many new cracks after being heated after alternating action, increases the permeability in coal seam.So as to improve extraction rate and extraction
Speed, it can more effectively carry out coal bed gas extraction.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the well pattern layout drawing in underground using the effect extraction coal bed gas that colds and heat succeed each other in the embodiment of the present invention 1, its
In, (a) is the top view of well pattern layout drawing, and (b) is the sectional view of the line A-A along figure (a).
Fig. 2 is that the SEM of unheated coal seam different amplification schemes, wherein, (1) multiplication factor 100 ×, (2) times magnification
Number 200 ×, (3) multiplication factor 500 ×.
Fig. 3 is the embodiment of the present invention 1, and the SEM using the different amplification in infrared heating coal seam schemes, wherein, (4) amplification
Multiple 100 ×, (5) multiplication factor 200 ×, (6) multiplication factor 500 ×.
Fig. 4 is the well pattern layout drawing in underground using the effect extraction coal bed gas that colds and heat succeed each other in the embodiment of the present invention 2, its
In, (c) is the top view of well pattern layout drawing, and (d) is the sectional view of the line B-B along figure (c).
In figure 1 above and Fig. 4,1- active wells, 2- gas production producing wells, 3- thermal sleeves, 4- screen casing sleeve pipes, 5- roofs
Overlying rock, 6- coal seams, 7- seat earths.
Embodiment
With reference to embodiment, the present invention is described in further detail.
Embodiment 1
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other, carry out according to the following steps：
Step 1, a well pattern is established in coal seam
Vertical drilling well is carried out from ground, arranges well pattern, its well pattern layout drawing is shown in Fig. 1, and in Fig. 1, (a) is well pattern layout drawing
Top view, (b) are the sectional view of the line A-A along figure (a), and drilling well spacing distance is 300m, and the well depth of drilling well is until coal seam 6, well
Mouthful number is 5, wherein, after vertical drilling enters coal seam 6, the lower screen casing sleeve pipe 4 in 6 sections of coal seam, overlying strata on the roof in coal seam more than 6
5 sections of lower thermal sleeve 3 of layer, and accordingly cemented the well according to code requirement；
After well cementation, in the well pattern of 5 mouthfuls of wells of arrangement, selecting a bite well, it act as implementation and colded and heat succeed each other as active well 1
Effect；As gas production producing well 2, it act as gathering coal bed gas other wells；
SEM scanning analysis, the figure that the SEM figures of its different amplification are shown in Fig. 2 are carried out to coal seam in the well pattern of arrangement
(1)、(2)、(3)；
Step 2, heat
It is lowered into as the infrared heating device of thermal source from active well 1 in coal seam 6, utilizes the instantaneous liter of infrared heat source
Temperature characteristics, the temperature of infrared heat source is adjusted to 400 DEG C, continuous heating is carried out to coal seam, treats coal seam temperature >=350 DEG C, stop adding
Heat；
For the infrared heating device of addition as thermal source, it has special electromagnetic property and the characteristic of moment heating, black
Material has preferable absorbability to its heat, therefore heat energy can be propagated comparatively fast in coal seam, improves the efficiency of heating surface.
SEM scanning analysis are carried out to the coal seam after heating, figure (4) that the SEM figures of its different amplification are shown in Fig. 3,
(5)、(6)；Analyzed by the SEM figures with unheated coal seam, obtain the coal seam after heating, its UNICOM's coal seam hole
It is extremely obvious with development coal seam initial fissure effect.
Step 3, freeze
By active well 1, liquid nitrogen is injected into coal seam 6, the injection rate of liquid nitrogen is different with coal body feature according to geological conditions
Depending on, after liquid nitrogen vaporization, refrigeration terminates；
Described liquid nitrogen not only has fracturing characteristic to coal seam, and nitrogen can improve the desorption migration effect of coal bed gas after it is vaporized
Rate.
Step 4, cold and heat succeed each other
After liquid nitrogen vaporization, coal seam 6 is carried out by the use of infrared heating device as thermal source heating repeat step 2 again, work as coal seam
Temperature >=350 DEG C, step 3 is carried out, repeatedly step 2 and step 3 are repeated, allow coal seam to be constantly in the operation shape that colds and heat succeed each other
In state, the mixed gas that drainage and step-down extraction contains coal bed gas is carried out to gas production producing well, then using known mixed gas
Separation method, you can obtain gaseous coal bed gas, realize that mixed gas separates.
Embodiment 2
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other, carry out according to the following steps：
Step 1, a well pattern is established in coal seam
Vertical drilling well is carried out from ground, arranges well pattern, its well pattern layout drawing is shown in Fig. 4, and in Fig. 4, (c) is well pattern layout drawing
Top view, (d) are the sectional view of the line B-B along figure (c), and drilling well spacing distance is 500m, and the well depth of drilling well is until coal seam 6, well
Mouth number is 14, wherein, after vertical drilling enters coal seam 6, the lower screen casing sleeve pipe 4 in 6 sections of coal seam, the roof overlying in coal seam more than 6
The lower thermal sleeve 3 in 5 sections of rock stratum, and accordingly cemented the well according to code requirement；
After well cementation, in the well pattern of 14 mouthfuls of wells of arrangement, as active well 1, it act as implementing cold and hot choosing wherein 2 mouthfuls of wells
Alternating action；As gas production producing well 2, it act as gathering coal bed gas other wells；
Herein, when active well is 2, it can effectively realize well pattern connection and accelerate the harvest efficiency of coal bed gas.
Step 2, heat
It is lowered into as the infrared heating device of thermal source from active well 1 in coal seam 6, utilizes the instantaneous liter of infrared heat source
Temperature characteristics, the temperature of infrared heat source is adjusted to 450 DEG C, continuous heating is carried out to coal seam, treats coal seam temperature >=350 DEG C, stop adding
Heat；
For the infrared heating device of addition as thermal source, it has special electromagnetic property and the characteristic of moment heating, black
Material has preferable absorbability to its heat, therefore heat energy can be propagated comparatively fast in coal seam, improves the efficiency of heating surface.
Step 3, freeze
By active well 1, liquid nitrogen is injected into coal seam 6, the injection rate of liquid nitrogen is different with coal body feature according to geological conditions
Depending on, after liquid nitrogen vaporization, refrigeration terminates；
Described liquid nitrogen not only has fracturing characteristic to coal seam, and nitrogen can improve the desorption migration effect of coal bed gas after it is vaporized
Rate.
Step 4, cold and heat succeed each other
After liquid nitrogen vaporization, coal seam 6 is carried out by the use of infrared heating device as thermal source heating repeat step 2 again, work as coal seam
Temperature >=350 DEG C, step 3 is carried out, repeatedly step 2 and step 3 are repeated, allow coal seam to be constantly in the operation shape that colds and heat succeed each other
In state, the permeability of coal seam 6 is relatively low, and well pattern does not connect, and now extends the activity duration that colds and heat succeed each other in active well, until well
Net connection.The mixed gas that drainage and step-down extraction contains coal bed gas is carried out to gas production producing well, then using known gaseous mixture
Body separation method, you can obtain gaseous coal bed gas, realize that mixed gas separates.
Embodiment 3
A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other, carry out according to the following steps：
Step 1, a well pattern is established in coal seam
Vertical drilling well is carried out from ground, arranges well pattern, drilling well spacing distance is 100m, and the well depth of drilling well is until coal seam 6, well
Mouthful number is 3, wherein, after vertical drilling enters coal seam 6, the lower screen casing sleeve pipe 4 in 6 sections of coal seam, overlying strata on the roof in coal seam more than 6
5 sections of lower thermal sleeve 3 of layer, and accordingly cemented the well according to code requirement；
After well cementation, in the well pattern of 3 mouthfuls of wells of arrangement, as active well 1, it act as implementing cold and hot choosing wherein 1 mouthful of well
Alternating action；As gas production producing well 2, it act as gathering coal bed gas other wells；
Step 2, heat
It is lowered into as the infrared heating device of thermal source from active well 1 in coal seam 6, utilizes the instantaneous liter of infrared heat source
Temperature characteristics, the temperature of infrared heat source is adjusted to 380 DEG C, continuous heating is carried out to coal seam, treats coal seam temperature >=350 DEG C, stop adding
Heat；
For the infrared heating device of addition as thermal source, it has special electromagnetic property and the characteristic of moment heating, black
Material has preferable absorbability to its heat, therefore heat energy can be propagated comparatively fast in coal seam, improves the efficiency of heating surface.
Step 3, freeze
By active well 1, liquid nitrogen is injected into coal seam 6, the injection rate of liquid nitrogen is different with coal body feature according to geological conditions
Depending on, after liquid nitrogen vaporization, refrigeration terminates；
Described liquid nitrogen not only has fracturing characteristic to coal seam, and nitrogen can improve the desorption migration effect of coal bed gas after it is vaporized
Rate.
Step 4, cold and heat succeed each other
After liquid nitrogen vaporization, coal seam 6 is carried out by the use of infrared heating device as thermal source heating repeat step 2 again, work as coal seam
Temperature >=350 DEG C, step 3 is carried out, repeatedly step 2 and step 3 are repeated, allow coal seam to be constantly in the operation shape that colds and heat succeed each other
In state, the mixed gas that drainage and step-down extraction contains coal bed gas is carried out to gas production producing well, then using known mixed gas
Separation method, you can obtain gaseous coal bed gas, realize that mixed gas separates.
Claims (7)
- A kind of 1. method in underground using the effect extraction coal bed gas that colds and heat succeed each other, it is characterised in that carry out according to the following steps：Step 1, a well pattern is established in coal seamVertical drilling well is carried out from ground, arranges well pattern, the well depth of drilling well is until coal seam, well head number >=2, vertical drilling enter coal seam Afterwards, screen casing sleeve pipe under coal seam section, coal seam are accordingly cemented the well with upper and lower thermal sleeve；Wherein, in the well pattern of arrangement, at least a bite well is as active well, and other wells are as gas production producing well；Step 2, heatThermal source is lowered into coal seam from active well, heat source temperature is adjusted to 380~450 DEG C, and coal seam is heated, and treats coal seam Temperature >=350 DEG C, stop heating；Described thermal source is electromagnetic heat source；Step 3, freezeBy active well, inject liquid nitrogen into coal seam, the injection rate of liquid nitrogen according to geological conditions with depending on coal body feature difference, liquid After nitrogen vaporization, refrigeration terminates；Step 4, cold and heat succeed each otherRepeat step 2 and more times of step 3, allow coal seam to be constantly in the job state that colds and heat succeed each other, in gas production producing well extraction coal Layer gas.
- 2. the method in underground using the effect extraction coal bed gas that colds and heat succeed each other as claimed in claim 1, it is characterised in that described Step 1 in, described drilling well, its spacing distance is 100~500m, and well pattern arrangement can be with single or multiple rows of distribution.
- 3. the method in underground using the effect extraction coal bed gas that colds and heat succeed each other as claimed in claim 1, it is characterised in that described Step 1 in, active well is at least one.
- 4. the method in underground using the effect extraction coal bed gas that colds and heat succeed each other as claimed in claim 1, it is characterised in that described Step 1 in, described coal seam is with upper and lower thermal sleeve, collet under the roof overlying rock section specially more than coal seam Pipe.
- 5. the method in underground using the effect extraction coal bed gas that colds and heat succeed each other as claimed in claim 1, it is characterised in that described Step 2 in, described electromagnetic heat source is infrared heat source.
- 6. the method in underground using the effect extraction coal bed gas that colds and heat succeed each other as claimed in claim 1, it is characterised in that described Step 4 in, described coal seam colds and heat succeed each other in effect, and when coal seam permeability is relatively low, when establishing well pattern, well pattern does not connect It is logical, in step 4, the activity duration that colds and heat succeed each other in active well is extended, until well pattern connects.
- 7. the method in underground using the effect extraction coal bed gas that colds and heat succeed each other as claimed in claim 1, it is characterised in that described Step 4 in, described gas production producing well extraction coal bed gas, specially gas production producing well carry out drainage and step-down extraction contain coal seam The mixed gas of gas, then using known mixed gas separation method, you can obtain gaseous coal bed gas, realize mixed gas Separation.
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| CN109252847A (en) * | 2018-11-16 | 2019-01-22 | 中国石油大学(北京) | The method and device of water and cryogen alternating fracturing control coal seam fracture extension |
| CN109854221A (en) * | 2019-03-08 | 2019-06-07 | 中国矿业大学 | A kind of underground note is cold, heating works alternatively the anti-reflection coal seam system of circulation fracturing and pumping method |
| CN109854210A (en) * | 2019-03-05 | 2019-06-07 | 重庆大学 | Using the gas pumping method and extraction system of liquid nitrogen and steam fracturing coal seam |
| CN114856518A (en) * | 2022-05-09 | 2022-08-05 | 大连理工大学 | Method for increasing production of coal bed gas by using medium-low enthalpy dry rock geothermal energy |
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