CN103670338A - Method for extracting coalbed methane and coal together - Google Patents
Method for extracting coalbed methane and coal together Download PDFInfo
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- CN103670338A CN103670338A CN201210356627.1A CN201210356627A CN103670338A CN 103670338 A CN103670338 A CN 103670338A CN 201210356627 A CN201210356627 A CN 201210356627A CN 103670338 A CN103670338 A CN 103670338A
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- 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
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
- E21B41/0057—Disposal of a fluid by injection into a subterranean formation
- E21B41/0064—Carbon dioxide sequestration
-
- 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
-
- 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
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- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
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- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
- E21B43/247—Combustion in situ in association with fracturing processes or crevice forming processes
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- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
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- 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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Abstract
本发明涉及一种煤层气与煤共采方法，所述方法包括：钻井步骤；压裂贯通步骤；抽采煤层气步骤；点火步骤及地下气化步骤。本发明方法将煤炭地下气化技术与煤层气抽采技术结合，既可以利用地下气化高温加热煤层，增加煤层透气性，提高煤层气采收率，还可以利用煤层气进行钻井和压裂贯通过程，提升地下气化采煤的效率。
The invention relates to a method for co-mining coal bed methane and coal. The method comprises: a drilling step; a fracturing and penetration step; a step of extracting the coal bed methane; The method of the invention combines the underground coal gasification technology with the coalbed methane extraction technology, which can not only use the underground gasification to heat the coalbed at high temperature, increase the gas permeability of the coalbed, improve the recovery rate of the coalbed methane, but also use the coalbed methane for drilling and fracturing penetration process to improve the efficiency of underground gasification coal mining.
Description
Technical field
The present invention relates to a kind of production practice of Novel underground carbon containing humatite reservoir, more specifically the common mining method of subterranean coal gas and coal.
Background technology
Coal is the main energy sources of China, accounting 70% left and right in primary energy forms, and total resources is relatively abundant, prediction approximately 4.5 trillion tons of total resourcess (2000 meters with shallow), wherein covered depth at 600 meters with shallow stock number accounting 25% left and right only, just the coal mining degree of depth (400 meters) is estimated at present, in China underground coal prediction total resources, at least also have about 80% coal resources be not also developed and utilize, the exploitation of deepen coal resource will be a long-term job.Increase along with mining depth, associated resources-the gas of coal (also claiming coal bed gas) content also increases rapidly, and according to coal bed gas resource evaluation, 2000 meters of China's buried depths are about 36 tcms with shallow coal bed gas geological resources, occupy third place in the world, suitable with land conventional gas stock number.
Although China's coal bed gas resource is abundant; but China's Occurrence of Coalbed Methane criteria range difference is large; most areas are low-pressure, hyposmosis, low saturated feature, and except Qinshui basin and Eastern Margin of Ordos Basin, scale is realized in other areas at present, industrialization development difficulty is large.And high gas and coal and gas outburst mine many, along with mining depth strengthens, geostatic stress and gas pressure further increase, extraction difficulty in down-hole increases.Moreover, continuous increase along with mining depth, geological environment is more complicated, geostatic stress increases, water yield strengthens, Rise of Geotemperature, cause sudden engineering project disaster and great serious accident to increase, as Rock Burst, gas explosion, ore deposit, press and manifest aggravation, roadway surrounding rock large deformation, rheology, Rise of Geotemperature etc., the safety and high efficiency of deep resource has been caused to grave danger.Thereby no matter be the angle consideration of demand for security from coal mining process, still from improving coal resources utilization rate, promote the angle of Coal Industry Sustainable Development to consider, all must study and solve the exploitation of difficulty coal mining and coal bed gas and utilize problem.
Disclosed data shows, can there is tax underground coal seam to carry out controlled burning in coal underground gasification technology, by pyrolysis and chemical action, the Gas Energy Source that generation can effectively utilize, thereby realize the original position gasification exploitation to coal, this technology has obtained considerable success for the gasification in superficial part coal seam, and the Bing former Soviet Union has realized commercialized running.After last century oil crisis, Some European country once adopted coal underground gasification technology, from not obtaining the energy with the coal seam, deep of conventional method exploitation, wherein 1978～1986, Belgium and Germany combined and Belgian figure woods, have carried out first deep coal layer underground gasifying and test (the coal seam degree of depth is 860m); 1988,6 member states of European Union have set up European gasifying underground coal working group, in 1998 Nian Spain Te Luaier mining areas, carry out medium deep coal layer underground gasifying (the coal seam degree of depth is 550～650m) test, verified the feasibility of European deep coal layer underground gasifying technology.
Coal underground gasification technology is to exploit at present the most effective technology of deepen coal resource, but existing coal underground gasification technology is mostly just considered the gasification in coal seam, and along with the increase of the coal mining degree of depth, coal bed gas content will increase rapidly, thereby inevitably can run into the extraction problem of coal bed gas, particular problem comprises: (1), for the coal seam of Enriching Coalbed Methane, if directly implement the gasification in coal seam, can exist the threat of secure context and the problems such as waste of resource; (2) if adopt conventional coal-bed gas exploitation means, and not considering and the combination of underground gasification technology,, can there is the overlapping of the functions such as boring in subsequent implementation underground coal gasification(UCG) so, and the increase of cost of investment etc.; (3) in coal seam, inject CO
2can improve coal seam CH
4recovery ratio, but only at the coal bed gas extraction initial stage, can heighten methane output, but later stage crack is easily closed, methane output declines very fast; (4) as one of the intermediate of gasification and product composition, CO
2having participated in a series of redox reaction, is the important component in outlet coal gas, and content accounts for 15～60%, is one of key factor being related to calorific value of gas and active principle content, but existing technique is not considered CO conventionally
2recovery and utilization.
Summary of the invention
The inventor finds, there is some similitudes and cooperative effect at process procedures such as boring, pressure break, the transformations of increasing gap in coal bed gas extraction and underground coal gasification(UCG), the underground technology of coal and coal bed gas extraction technology can be combined to the co-development utilization that considers underground coal resource and coal bed gas resource.On the one hand, the high-temperature medium heating coal seam that can utilize underground coal gasification(UCG) to produce, CH in coal bed gas under high temperature
4adsorption capacity reduces greatly, and when gases are heated, they expand in the process of transmitting to coal seam for heat energy simultaneously, is conducive to set up producing pressure differential, thereby improves coal-bed methane seepage speed; On the other hand, the processes such as CBM Fracturing volume increase in early stage, drainage and step-down, improve gas permeability of coal seam, will be conducive to the foundation of flame range and the carrying out of follow-up gasification of coal underground gasifying technology, after while coal seam is heated, permeability can improve 2～10 times, thereby is more conducive to promote CH
4desorb.In addition, from angles of product, the cost of carbon dioxide and methane separation is low compared with the separation costs of nitrogen and methane, and the carbon monoxide in coal gas and hydrogen is synthesizing methane directly, and its final products are the same with coal bed gas is all methane.Visible, coal bed gas extraction can combine with underground gasification, and both mutually promote, mutually collaborative, both can improve the recovery ratio of coal bed gas, simultaneously owing to having improved the gas permeability in coal seam, has increased reaction table area, is conducive to again the carrying out of underground coal gasification(UCG) reaction.
Difficult point in view of China's coal-bed gas exploitation, the advantage of coal underground gasification technology in coal mining, and both above-mentioned cooperative effects of existing in technology, what the object of this invention is to provide a kind of coal bed gas and coal adopts new method altogether, the method is coupled coal-bed gas exploitation and coal underground gasification technology, adopts altogether and in process, has used the medium that contains carbon dioxide.
For this reason, the invention provides a kind of coal bed gas and coal mining method altogether, comprising:
1) drilling well step: for example carry out drilling well and make at least one air inlet boring that described coal seam is communicated with ground and at least one go out gas drilling hole to provide in coal seam to underground carbon containing humatite reservoir by ground;
2) pressure break connects step: by described air inlet boring, inject the pressure break medium that contains carbon dioxide to described coal seam, force described pressure break medium to flow in described coal seam, and by described, go out gas drilling hole and discharge, thereby make described air inlet boring and described in go out gas drilling hole and by being communicated with crack, be communicated with in described coal seam;
3) extraction coal bed gas step: inject displacing medium by described air inlet boring to described coal seam, the coal bed gas in described coal seam is carried out to displacement, and go out gas drilling hole and collect by described;
4) lighting up procedure: set up flame range in the coal seam of the described foot of hole of giving vent to anger, with the coal seam of igniting; And
5) underground gasification step: inject carbonated gasifying agent to described coal seam by described air inlet boring, gasification reaction and pyrolytic reaction are carried out in described gasifying agent and described coal seam, produce heat energy and gasification gas, described heat energy to described coal seam internal delivery to produce pyrolysis coal gas, described in synchronous displacement, coal bed gas to be to produce free methane, and described free methane goes out gas drilling hole and discharges and collect from described together with described gasification gas, described pyrolysis coal gas.
Yet, it is emphasized that the inventive method is not the simple combination of underground gasification and coal bed gas extraction technology, must be improved original technique separately, to adapt to the coupling of two kinds of technologies, to be in particular in, adopted following at least one improvement:
A. during CBM Drilling preferably according to main crack, coal seam vertical direction horizontal well drilling.Main fissure direction is positioned at coal seam water plane, can get by geostress survey, orientation the means such as core analysis and determine, the directionality problem of horizontal well is not considered in existing coal bed gas extraction
B. the distance of coal bed gas horizontal well horizontal segment is determined according to underground gasification flame range Longitudinal Extension scope (being horizontal well direction), and the major parameter that determines this spreading range has the geostatic stress in coal seam to distribute and size, the original permeability in coal seam and the permeability under different temperatures, the reactivity of coal, the structure in coal seam and tomography, the mechanical properties of rock of coal petrography under different temperatures etc.Also need in conjunction with field trial if desired, conclude and sum up suitable length.Existing coal bed gas extraction is not considered horizontal well horizontal section length according to this standard;
C. the air inlet/outlet specification of coal bed gas (being material, internal-and external diameter, well construction, construction technology) according to the manufacturing process determination of underground gasification, specifically passes in and out tolerance, temperature, operating pressure, the length of service etc.And air inlet/outlet is only determined specification according to pressure and gas output size in coal bed gas extraction;
D. the track of transferring the degree of depth and horizontal well horizontal segment that coal bed gas extraction is considered sleeve pipe when boring peupendicular hole, in the bottom in coal seam, approaches base plate, to guarantee the rate of extraction in coal seam.This point is not considered in coal bed gas extraction;
While e. designing the gasification furnace of underground gasification, consider the scope (distribute and determine by on-the-spot each hole force value) of CBM Fracturing, determine that stove district arranges scope; During underground gasification design gasification furnace, only according to the hot influence basin in coal seam (determining by on-the-spot thermometer hole), determine the layout scope in stove district, and the scope of CBM Fracturing is obviously greater than this hot influence basin;
F. before underground gasification igniting, monitor the methane content of air inlet/outlet, control the content of oxygen in air inlet, guarantee the accident of not blasting; Because coal bed gas extraction is to carry out under cold conditions, do not have oxygen to get involved, do not need to consider the blast problem of methane.
In a preferred embodiment, described drilling well according to coal seam water plane and along coal seam main crack vertical direction horizontal well drilling.
In a preferred embodiment, the track of transferring the degree of depth and horizontal well horizontal segment that sleeve pipe is considered in coal bed gas extraction when boring peupendicular hole is in bottom, coal seam, apart from 1～3 meter of seat earth.
In a preferred embodiment, described pressure break medium is the mixture of carbon dioxide and oxygen, and wherein the volumetric concentration of oxygen is below 20%.
In a preferred embodiment, in described extraction coal bed gas step 3) in the coal bed gas in described coal seam is carried out to displacement is to inject CO
2or nitrogen carries out displacement.
In a preferred embodiment, described method also comprises: 6) reclaim CO
2step: by the CO producing in described underground gasification step
2reclaim, and by reclaimed CO
2a part as described gasifying agent.
In a preferred embodiment, described recovery CO
2the CO reclaiming in step
2be used as the displacing medium that described pressure break connects the pressure break medium of step or is used as described extraction coal bed gas step.
In a preferred embodiment, described method also comprises: 7) CO
2seal step up for safekeeping: described air inlet boring and described in the coal seam that goes out between gas drilling hole complete after described underground gasification, by the part CO reclaiming
2seal combustion dead zone (this combustion dead zone is cavity residual after coal seam gasification) up for safekeeping, bury and seal up for safekeeping.
In a preferred embodiment, be also included in described lighting up procedure 4) carry out before safety detection step to guarantee a fire safety.
In a preferred embodiment, the pressure break medium that described pressure break connects in step is gaseous state, liquid state or the supercritical carbon dioxide, or wherein the volumetric concentration of oxygen is the mixture of the carbon dioxide and oxygen below 20%, or by liquid CO
2, water frozen glue (as guanidine glue, its effect is the denseness that improves pressure break medium, reduces the leak-off of pressure break medium, increases crack width) and chemical addition agent (as potassium chloride, its effect is to make pressure break medium form stable system) composition mixed liquor.
In a preferred embodiment, in described underground gasification step, in carbonated gasifying agent, the volumetric concentration of oxygen is 20～70%, to guarantee that melting does not occur ash content.
In a preferential embodiment, the carrier of oxygen volume concentrations in described underground gasification step in carbonated gasifying agent is 20～50%, to build gasification tunnel.
In a preferential embodiment, the carrier of oxygen volume concentrations in described underground gasification step in carbonated gasifying agent is 40～70%, the coal seam gasification after having built for gasification tunnel.
One preferred embodiment in, if complete in coal bed gas extraction, when the water content in coal seam is less than the required water yield of coal seam gasification, gasifying agent is the mixture of oxygen, carbon dioxide and steam.The amount that wherein adds steam should be that coal seam gasification institute water requirement deducts coal seam water content again divided by the resolution ratio of steam.
In a preferred embodiment, describedly by electric ignition (for example set up flame range, in the coal seam of planning to build vertical flame range, place electric heater, control point fire hole pressure is greater than hydrostatic head, guarantee point fire hole is anhydrous, then flame range is set up in energising heating, the coal seam of igniting) or solid fuel igniting (for example place red-hot coke in the coal seam of planning to build vertical flame range, pass into oxygen and set up flame range with combustion of coke and then the coal seam of igniting) complete.
In a preferred embodiment, in described pressure break, connect in step, the pressure in described air inlet sharply declines (finger pressure power fall reaches left and right, 5% of reset pressure/sky or larger) and the throughput that goes out of described venthole is 100Nm
3when/h is above, described air inlet boring and described in go out gas drilling hole and in described coal seam, formed and be communicated with crack.
In a preferred embodiment, described underground gasification comprises forward combustion (being that gasification face flame moving direction is consistent with airflow direction), reverse combustion (being that gasification face flame moving direction and airflow direction are contrary) or retreats the burning of gas injection point (in horizontal well, insert a set of continuous-tube, at this cover continuous-tube of ground pull, realize continuous-tube and in horizontal well, retreat movement, at diverse location, light a fire and gasify).
In a preferred embodiment, described gasification gas, pyrolysis coal gas and coal bed gas go out to be collected after gas drilling hole is discharged, methane-generating synthetic for methane or methane-methanol production through described.
In a preferred embodiment, the conveying of the described gasifying agent in described underground gasification step is delivered to described flame range or directly by boring, by ground, is delivered to described flame range by ground by annulus type (being bilayer sleeve) conveyance conduit.
In a preferred embodiment, described recovery CO
2the CO reclaiming in step
2be used as the displacing medium that described pressure break connects the pressure break medium of step or is used as described extraction coal bed gas step.
The inventive method is combined coal underground gasification technology with coal bed gas extraction technology, both can utilize underground gasification high-temperature heating coal seam, increases gas permeability of coal seam, improves coal bed gas recovery ratio; Can realize the coupling of drilling technology and fracturing technique again, simultaneously can be by CO
2directly trapping, as the medium of coal bed gas displacement and the gasifying agent of underground gasification process, regulates and controls coal gas active principle content.By the coupling of technology, improve coal bed gas produced rate, regulate coal gas available gas to form, reduce Gas Production cost, realize CO simultaneously
2trapping and recycling.
Accompanying drawing explanation
Fig. 1 is according to the schematic flow sheet of coal bed gas of the present invention and the common mining method of coal;
Fig. 2 is that wherein CO, by cold conditions pressure break, is injected in the coal seam between boring according to the schematic diagram of the coal bed gas of one embodiment of the present invention and the common mining method of coal
2extraction coal bed gas;
Fig. 3 is according to the schematic diagram of the coal bed gas of one embodiment of the present invention and the common mining method of coal, wherein sets up flame range hot-working is carried out in crack, is expanded into gasification tunnel, synchronously gas displacing coal-bed;
Fig. 4 is the coal bed gas of another embodiment according to the present invention and the schematic diagram that coal is total to mining method, wherein adopts pinniform branch horizontal drilling technology extraction coal bed gas;
Fig. 5 is the coal bed gas of another embodiment according to the present invention and the schematic diagram that coal is total to mining method, wherein lights a fire and passage hot-working, is expanded into gasification tunnel, synchronously gas displacing coal-bed;
Fig. 6 is the coal bed gas of another embodiment according to the present invention and the schematic diagram that coal is total to mining method, wherein adopts directed horizontal drilling technology extraction coal bed gas; And
Fig. 7 is the coal bed gas of another embodiment according to the present invention and the schematic diagram that coal is total to mining method, wherein lights a fire and passage hot-working, is expanded into gasification tunnel, synchronously gas displacing coal-bed.
Description of reference numerals
1-coal seam
2-ground
3-overlying rock
4-is communicated with crack
5-air inlet boring
6-goes out gas drilling hole
7-O
2pipeline
8-CO
2pipeline
9-flowing line
10-coal bed gas pipeline
The initial flame range of 11-
12-gasification tunnel
13-gas-pipe line
14-pinniform branch horizontal well
15-horizontal well
The specific embodiment
In view of the difficult point of China's coal-bed gas exploitation, and the advantage of coal underground gasification technology in coal mining, what the invention provides a kind of coal bed gas and coal adopts new method altogether.
In view of these aspects, the inventive method is coupled coal-bed gas exploitation and coal underground gasification technology, because underground gasification and ground coal bed gas extraction process all need to realize by boring, a underground gasification unit, conventionally at least need an air inlet boring, a gasification tunnel going out between gas drilling hole and two borings of connection, gasification tunnel adopts the means such as pressure break and firepower perforation to realize conventionally; And a coal bed gas extraction unit needs at least one blind hole conventionally, as the horizontal well of a upright opening or multi-branched, and need to adopt pressure break means to increase gap, also can comprise a gas injection well and a plurality of producing well.So underground gasification and ground coal bed gas extraction be similitude to a certain degree technically, and coal underground gasification technology is combined with coal bed gas extraction technology, both can utilize underground gasification high-temperature heating coal seam, increase gas permeability of coal seam, improve coal bed gas recovery ratio; Can realize the coupling of drilling technology and fracturing technique again, simultaneously can be by CO
2directly trapping, as the medium of coal bed gas displacement and the gasifying agent of underground gasification process, regulates and controls coal gas active principle content.By the coupling of technology, improve coal bed gas produced rate, regulate coal gas available gas to form, reduce Gas Production cost, realize CO simultaneously
2trapping and recycling.
As shown in Figure 1, method of the present invention can comprise drilling well, pressure break perforation, extraction coal bed gas, coal seam igniting, underground gasification, recovery CO
2and CO
2the step such as seal up for safekeeping.
More specifically, the common mining method of coal bed gas of the present invention and coal comprises the steps:
Step a1: be drilled into few 2 borings from ground to coal seam, two boring the line of bottom and the main fissure direction in coal seam consistent, one of them is holed as air inlet, another is as going out gas drilling hole, by air inlet boring, inject the pressure break medium that high pressure as the pressure break medium fracture pressure of coal seam (higher than) contains carbon dioxide, force CO
2along the hole in coal seam with move in crack and discharge from going out gas drilling hole, thereby in coal seam, set up and be communicated with crack between boring;
Step a2: close out gas drilling hole, continue to inject continuously to coal seam CO by air inlet boring
2, then stop injecting CO
2, close air inlet and hole and close out gas drilling hole and boil in a covered pot over a slow fire well, make CO
2displacement coal seam CH
4, reopen out gas drilling hole afterwards, extraction coal bed gas;
Step a3: resolve situation repeating step a2, CH in the borehole gases of giving vent to anger according to coal bed gas
4for example obviously reducing, after (methane volumetric concentration is less than 5%) appears in content, in the foot of hole coal seam igniting of giving vent to anger, afterwards by CO
2be made into certain density CO with pure oxygen
2oxygen rich gas (is called CO
2oxygen enrichment), the connection crack forming along coal seam between hole via air inlet boring is delivered to flame range continuously, makes burning things which may cause a fire disaster in face of CO
2oxygen-enriched stream direction moves to air inlet boring direction, CO
2oxygen enrichment reacts with coal seam generating gasification, pyrolytic reaction, and connection crack is processed into gasification tunnel and continues gasification and generates gasification gas and pyrolysis coal gas simultaneously:
C+O
2→CO
2-394kJ/mol
C+CO
2→2CO+173kJ/mol
C+H
2O→H
2+CO+131kJ/mol
Coal → H
2+ CH
4+ CO
2+ tar+semicoke+
Meanwhile, the heat discharging is delivered in coal seam, promotes CH
4desorb, and dry coal seam increase gas permeability of coal seam, the methane after desorb and gasification gas, pyrolysis coal gas are discharged by going out gas drilling hole in the lump;
Step a4: as described CO
2the difference that intake oxygen enrichment pressure and coal gas go out atmospheric pressure occurs obviously reducing after (being generally 0.3MPa left and right), increases CO
2oxygen enrichment flow or increase CO
2oxygen enrichment oxygen concentration, further improves reaction zone temperature, strengthening CH
4desorb, and make burning things which may cause a fire disaster against CO
2oxygen-enriched stream direction moves to the boring direction of giving vent to anger, and guarantees CO
2with the red-hot abundant haptoreaction in coal seam, complete the original position gasification exploitation in coal seam between boring simultaneously;
Further, CO in described step
2, can be gaseous state, liquid state, above-critical state CO
2, also can be by liquid CO
2, water frozen glue (as guanidine glue, its effect is the denseness that improves pressure break medium, reduces the leak-off of pressure break medium, increases crack width) and chemical addition agent (as potassium chloride, its effect is to make pressure break medium form stable system) composition mixed liquor.
Further, in fracturing work, monitoring CO
2injection hole pressure changing, when boring pressure occurs declining rapidly (be pressure decrease by former force value about 5% every day or larger), and goes out throughput and is not less than 100Nm
3during/h, show in coal seam, to have formed and be communicated with crack between boring.
Further, described CO
2oxygen enrichment, requiring step a3 carrier of oxygen volume concentrations is 20～50%, requiring step a4 oxygen concentration is 40～70%, to guarantee that melting does not occur ash content.If coal seam water quantity not sufficient, with the required coal that gasifies, also needs to add steam in gasifying agent, the amount of steam is determined according to mentioned above.
Further, described CO
2the conveying of oxygen enrichment, can be delivered to flame range by ground by annulus type conveyance conduit; Also can directly by boring, by ground, be delivered to flame range.
In described method, can also comprise step a5, reclaim CO
2: the CO that coal layer underground gasifying process is produced
2reclaim, and by part CO
2as the gasifying agent of coal layer underground gasifying, for regulating and controlling gas composition and calorific value.
In described method, can also comprise step a6, CO
2seal up for safekeeping: between two borings, coal seam completes after gasification, by the part CO reclaiming
2be filled into the combustion dead zone forming after coal seam gasification, bury and seal up for safekeeping.
In described boring, can guarantee the carrying out of gasification in two borings, one for air inlet, and one for giving vent to anger; In coal bed gas extraction process, can a boring be used for Enhanced Coalbed Methane Recovery by Injecting Gas, a boring is for the production of collecting from coal seam by displacement coal bed gas out simultaneously;
In described method, coal bed fracturing mode at least comprises: gas pressure break, fracturing or foam fracturing, mechanical type drilling technology.
In described method, step a1 also can use O
2and CO
2carry out pressure break, O
2concentration, in 20%, is specifically determined according to methane content in coal seam and methane explosion limit.
The mode of setting up flame range in described method can be at the bottom of the mist of high temperature and high pressure carbon dioxide and oxygen passes into drilling hole, wherein temperature is determined according to oxygen concentration, coal seam ignition point, coal seam bare area, pipeline heat waste etc., and pressure is determined according to coal seam hydrostatic head.
The mode of setting up flame range in described method also comprises: electric ignition, solid fuel igniting, or utilize original flame range or combustion high temperature coal seam, dead zone in operating area.
In described method, underground gasification mode at least comprises: forward combustion, reverse combustion or retreat gas injection point burning.Forward combustion refers to that flame face moving direction is consistent with airflow direction, reverse combustion refers to that flame face moving direction is contrary with airflow direction, and retreat the burning of gas injection point, refer in horizontal well, insert a set of continuous-tube, at this cover continuous-tube of ground pull, realize continuous-tube and in horizontal well, retreat movement, at diverse location, light a fire and gasify.
CO in described method
2can reclaim by number of ways, depend primarily on the purposes of coal gas and quality etc., as generating, the CO in the flue gas producing after can gas recovery generating
2, as synthetic as chemical industry, can be in gas purification CO in the separated and gas recovery of decarbonizing section
2, the flue gas that also can utilize coal gas or coal bed gas directly to burn and generate.
In described method, gasification gas, pyrolysis coal gas, coal bed gas, through going out after gas drilling hole discharge, can be used for methane synthetic, or carry out Poly-generation production, as methane-generating, and methane-methyl alcohol etc., production various energy resources chemical products.
The present invention also provides the common mining method of a kind of preferred coal bed gas and coal, and whole flow process is with CO
2recycling be core, the concrete advantage of the method is as follows:
The present invention combines coal-bed gas exploitation with underground gasification, compare other coal bed gas extraction technology, has greatly improved the recovery ratio of coal bed gas, reduces costs, and also considers CO simultaneously
2recovery and utilization, be particularly suitable for low permeability coal seam, coal-bed gas exploitation and underground gasification have very strong mutual synergy, are in particular in:
In the first step boring, both can be for CBM Fracturing and second step coal bed gas extraction well, also can be for the air inlet/outlet of the 3rd beans-and bullets shooter fire and the 4th step pyrolysis and gasification, CBM Drilling and underground gasification drilling well are intercoupled, being conducive to reduce drilling well drops into, save cost, for the exploitation of coal seam, deep resource, cost savings are especially obvious;
In the first step, carbon dioxide pressure break can improve the parsing of methane gas in second step coal bed gas extraction process, the great amount of carbon dioxide of adsorbing in coal seam can be for controlling coal seam temperature in follow-up the 3rd beans-and bullets shooter fire and the 4th step pyrolysis and gasification, prevent coal seam local overheating, produce the problem that spontaneous combustion or gasification tunnel melting etc. are unfavorable for igniting and gasification, can also improve the output of coal seam pyrolysis gas in the 4th step; In addition, first step fracturing process improves coal seam permeability greatly, for the 4th step pyrolysis and gasification provide favourable heat transfer and mass transfer condition, increases the spreading range of gasification face, improves the coal seam gasification rate of extraction; If add the mixture of carbon dioxide and oxygen as pressure break medium in the first step, the oxygen that rests on coal seam is conducive to light a fire and can be in the gasification of the 4th step, react with fuel gas, further improve the temperature in coal seam, both can prevent cracks in coal seam closed-ended question after carbon dioxide pressure break, can accelerate again the parsing of methane and the pyrolysis of coal in coal bed gas, thereby improve the content of methane in the coal gas generating, gas quality also can obviously be promoted.But the oxygen content in necessary control mist, outside the explosion limit of methane, specifically can realize by controlling oxygen concentration;
Second step coal bed gas extraction process is separated out a large amount of methane, and coal seam experiences pressurization and decompression process repeatedly, and coal seam permeability improves greatly, is conducive to the expansion of gasification face in the 4th step, and the methane that goes out gas well enrichment around is also conducive to igniting;
In the 4th step, by underground gasification, react the formation (being hot increasing gap) that the high temperature producing promotes cracks in coal seam, make coal seam cold conditions pressure break and the complementation of hot increasing gap produce cooperative effect, improved the percolation ability of coal bed gas, coal seam is also conducive to the parsing of methane after heating up greatly, and after having prevented first step carbon dioxide pressure break, cracks in coal seam closed-ended question produces; By physical desorption and chemical reaction combination, can greatly increase methane output; CO
2can accelerate the generating rate of CO, suppress water gas shift reaction, effectively regulate active principle content in coal gas, hydrogen-carbon ratio is suitable for synthesizing methane, simultaneously CO
2for displacement CH
4also improve coal bed gas produced rate, realize CO
2trapping and recycling, realize CO
2reduce discharging.
Below by specific embodiment, also by reference to the accompanying drawings the present invention is described in further detail, but should be appreciated that the present invention is not limited to these embodiment.
The present embodiment is described with reference to Fig. 2 and Fig. 3.Fig. 2 is that wherein CO, by cold conditions pressure break, is injected in the coal seam between boring according to the schematic diagram of a kind of coal bed gas of the present invention and the common mining method of coal
2extraction coal bed gas; And Fig. 3 is the schematic diagram that this coal bed gas and coal are total to mining method, wherein setting up flame range carries out hot-working to crack, is expanded into gasification tunnel, synchronously gas displacing coal-bed.As shown in Figures 2 and 3, according to intending gasification coal seam scope, boring is set in the present embodiment, drilling hole amount is by decisions such as coal seam reserves and Gas Production scales, but at least should comprise an air inlet and a venthole for realizing the present invention, and the specific embodiment is as described below:
Referring to Fig. 2 and Fig. 3, by ground 2, via overlying rock 3, in coal seam 1, construct upright opening as air inlet boring 5, within the scope of 5 certain distances of holing apart from air inlet (generally between 200 meters to 600 meters, specifically can according to coal etc., be determined by those skilled in the art, for example darker its boring length of degree of metamorphism is longer, for brown coal, generally choose 200 meters of left and right, bituminous coal is chosen 500 meters of left and right) construction upright opening as going out gas drilling hole 6, this enters, the bottom that goes out gas drilling hole is arranged in coal seam 1, apart from 2 meters of seat earths, air inlet boring 5 is consistent with the main fissure direction in coal seam with the bottom line that goes out gas drilling hole 6, the spacing of turnover gas drilling hole can be by those skilled in the art according to coal seam, the situations such as stratum are determined.
O are installed in air inlet 5 apertures of holing
2pipeline 7, CO
2pipeline 8, goes out gas drilling hole 6 apertures fix a drainpipe line 9, coal bed gas pipeline 10, gas-pipe line 13, wherein O
2pipeline 7 is for delivery of pure oxygen, CO
2pipeline 8 is for delivery of CO
2, and be made into the CO of certain volume concentration in the air inlet 5 interior mixing of holing
2oxygen enrichment (in the present embodiment, oxygen concentration is 10% left and right); Flowing line 9 is at pressure break and extraction coal bed gas stage pump drainage coal seam water, and coal bed gas pipeline 10 is for discharging coal bed gas in the extraction coal bed gas stage, and the rear conveying CO that gasified
2, with by CO
2seal up for safekeeping to the combustion dead zone forming after coal seam gasification, gas-pipe line 13 for delivery of igniting after the raw gas that generates of gasification.Specific operation process is:
By CO
2high-pressure carbon dioxide and O that pipeline 8 is carried
2the oxygen that pipeline 7 is carried injects coal seam 1 continuously via air inlet boring 5, injection pressure is 1.1 times of coal seam fracture pressure, forced gas medium natural hole and crack moves along coal seam, coal body is carried out to pressure break, produce and be communicated with crack 4, thereby be interconnected in coal seam 1 with going out gas drilling hole 6, complete post-fracturing gas via going out gas drilling hole 6 and being expelled to ground from coal bed gas pipeline 10.
Close out gas drilling hole 6, by air inlet boring 5, to coal seam, 1 continue to inject high pressure CO
2, injection pressure is not more than coal seam fracture pressure, and total injection determines according to coal seam saturated air content, treats CO
2after total injection rate meets the demands, stop injecting, close air inlet boring 5, and close the stewing well of venthole 1～15 day, to guarantee CO
2the CH that fully contacts with coal seam, adsorbs in displacement coal seam
4; Reopen out afterwards gas drilling hole 6, and carry out pump drainage by 9 pairs of coal seam waters of flowing line, with to coal seam 1 dehydration, open coal bed gas pipeline 10 simultaneously and gas drilling hole 6 pressure to reduce, be beneficial to coal bed gas desorb or desorption, and be collected into surface pipeline network by coal bed gas pipeline 10.After extraction a period of time, after going out gas drilling hole 6 pressure of the hole in the bottom and being down to below 10kPa, carry out injection and the extraction of next circulation.
CH in going out gas drilling hole 6 gases
4obviously reducing after (being that its volumetric concentration is less than 5%) appears in content, opens out gas drilling hole 6, proposes flowing line 9, and gas-pipe line 13 is installed.Open out afterwards the valve that is communicated with of gas drilling hole 6 and 13 of gas-pipe lines, and to coal seam, 1 continue to inject high pressure CO by air inlet boring 5
2, injection pressure is greater than coal seam hydrostatic pressure, and injection rate is according to coal seam moisture content, and discharged by gas-pipe line 13, and so that the moisture in coal seam between boring is taken out of, drainage coal seam moisture, uses gas drilling hole 6 hole ground coal layers and keeps dry.
Electric igniter is transferred to going out gas drilling hole 6 hole ground coal intervals, open out the valve that is communicated with of gas drilling hole 6 and 13 of gas-pipe lines, by O
2the pure oxygen that pipeline 7 is sent here, CO
2the CO that pipeline 8 is sent here
2, in the air inlet 5 interior mixing of holing, be made into the CO of carrier of oxygen volume concentrations 20～30%
2oxygen enrichment, as gasifying agent, is sent into out gas drilling hole 6 hole ground coal layers along being communicated with crack 4.Monitor afterwards the methane content of venthole, control the content of oxygen in air inlet, guarantee out gas drilling hole O
2concentration is not within the scope of methane explosion limit.O
2after concentration or methane content meet the demands, initial igniter is lighted a fire to going out gas drilling hole 6 hole ground coal layers, sets up initial flame range 11.Gasifying agent and coal seam 1 raw gas generating that reacts is discharged via gas-pipe line 13, controls CO
2oxygen enrichment flow (about 300-500m
3/ hour) make flame range temperature be not less than spontaneous combustion of coal seam ignition temperature.
After flame range temperature surpasses 1000 ℃, if when admission pressure fall surpasses 10%, with each 500～1000Nm
3/ h increases CO
2oxygen enrichment flow, until flow reaches 5000～8000Nm
3between/h, so that burning things which may cause a fire disaster is in face of CO
2oxygen-enriched stream direction moves to air inlet boring direction, due to CO
2oxygen enrichment reacts with coal seam generating gasification, pyrolytic reaction:
C+O
2→CO
2-394kJ/mol
C+CO
2→2CO+173kJ/mol
C+H
2O→H
2+CO+131kJ/mol
Coal → H
2+ CH
4+ CO
2+ tar+semicoke+
Along being communicated with crack 4 and part coal bed gas being melted, expanded connection crack, form gradually gasification tunnel 12, be beneficial to coal gas and discharge; The heat simultaneously discharging is delivered in coal seam, promotes CH
4desorb, and dry coal seam increase gas permeability of coal seam, the methane after desorb and gasification gas, pyrolysis coal gas are in the lump by going out gas drilling hole 6 and gas-pipe line 13 discharges.
Maintain afterwards this flow and O
2concentration, carries out reverse combustion (that is, the propagation direction of flame front is contrary with the flow direction that feeds gas), and the pressure of Real-Time Monitoring air inlet boring 5.When air inlet boring 5 is when going out gas drilling hole 6 pressure and be more or less the same (pressure reduction is less than 0.3MPa left and right), show: the lower end of air inlet boring 5 and the gasification tunnel 12 going out between the lower end of gas drilling hole 6 successfully construct.
Gasification tunnel 12 completes after structure, increases from the air inlet CO that 5 upper ends supply with to down-hole that holes
2the increase oxygen concentration of oxygen rich gas (increasing by 2～5% every day) to improve reaction zone temperature, and is carried out forward gasification (that is, the propagation direction of flame front with to feed flowing to of gas identical), assurance CO to 40～60%
2with the abundant haptoreaction in coal seam red-hot in gasification tunnel, to complete the gasification in coal seam between boring; Meanwhile, because gasification space expands, geostatic stress effect manifests, and under the acting in conjunction of heat effect, the coal seam of gasification tunnel periphery produces zone of fracture, accelerates coal bed gas and discharges.In practical operation, can be according to coal seam dirt band thickness, water content, the situations such as the spacing of wells, to CO
2oxygen rich gas flow and/or oxygen concentration are adjusted, if coal seam water content is less than gasification reaction institute water requirement, can injecting carbon dioxide oxygen enrichment and steam gas, the amount of injected water steam is that the difference of gasification reaction institute's water requirement and coal seam water content is divided by steam resolution ratio.
Coal seam gasification process finishes rear formation combustion dead zone, and its space, by lime-ash, cinder, dirt band, balkstone, the not coal seam institute filling of gasification, can be used as and seals CO up for safekeeping
2space.Seal up for safekeeping after beginning, close out gas drilling hole 6, open CO
2pipeline 7, injects high pressure CO
2, CO
2pressure general control is at 6～8MPa, CO
2injection rate general control is at 400～500Nm
3/ m
3(in the combustion dead zone of per unit volume, can seal up for safekeeping 400～500 mark cube CO
2), specifically according to decisions such as combustion dead zone volume, coal seam hydrology geological conditions.
The gasification gas of producing in the present invention, pyrolysis coal gas and coal bed gas are through going out after gas drilling hole discharge, synthetic for methane.
By ground 2, via overlying rock 3, in coal seam 1, construct vertical drilling as going out gas drilling hole 6, apart from going out construction air inlet in gas drilling hole 6 certain distance scopes (with reference to embodiment 1), holing 5, make to hole and 56 in coal seam, be communicated with boring, air inlet boring 5 is pinniform horizontal drilling, comprise some groups of pinniform branch horizontal wells 14, foot of hole is arranged in the coal seam 1 of pre-gasification.The quantity of the main horizontal well of pinniform branch horizontal well, aperture, length and the Multilateral Wells of Multilateral Wells, according to coal seam and coal-bed gas exploitation area definition.In order to prevent that the borehole wall from subsiding, also can in main horizontal well, be lowered to screen casing and carry out supporting.
Pinniform horizontal drilling completes after construction, in going out gas drilling hole 6, transfers the bar pump that draws water, and line 9 and coal bed gas pipeline 10 fix a drainpipe; Air inlet 5 well heads of holing are installed O
2pipeline 7, CO
2pipeline 8, closes out the valve that is communicated with of gas drilling hole 6 and 10 of gas-pipe lines, by air inlet boring 5, to coal seam, 1 injects continuously high pressure N
2, injection pressure is not more than coal seam fracture pressure, and total injection determines according to coal seam saturated air content, treats N
2after total injection rate meets the demands, stop injecting, close air inlet boring 5, and close the stewing well of venthole 10～20 days, to guarantee N
2the CH that fully contacts with coal seam, adsorbs in displacement coal seam
4; Reopen out afterwards gas drilling hole 6, and carry out pump drainage by 9 pairs of coal seam waters of flowing line, with to coal seam 1 dehydration, open coal bed gas pipeline 10 simultaneously and reduce and gas drilling hole 6 pressure, be beneficial to coal bed gas desorb or desorption, and be collected into surface pipeline network by coal bed gas pipeline 10.After extraction a period of time, after going out gas drilling hole 6 pressure of the hole in the bottom and being down to below 10kPa, carry out injection and the extraction of next circulation.
CH in going out gas drilling hole 6 gases
4obviously reducing after (volumetric concentration is less than 5%) appears in content, opens out gas drilling hole 6, proposes flowing line 9, and gas-pipe line 13 is installed.Open out afterwards the valve that is communicated with of gas drilling hole 6 and 13 of gas-pipe lines, and to coal seam, 1 continue to inject high pressure CO by air inlet boring 5
2, injection pressure is greater than coal seam hydrostatic pressure, and injection rate is according to coal seam moisture content, and discharged by gas-pipe line 13, so that the moisture in coal seam between boring is taken out of, is drainage coal seam moisture, uses gas drilling hole 6 hole ground coal layers and keeps dry.
By O
2the pure oxygen that pipeline 7 is sent here, CO
2the CO that pipeline 8 is sent here
2, in air inlet, holing, to be made into volumetric concentration be 20～30% CO in 5 interior mixing
2oxygen enrichment, as gasifying agent, is sent into out gas drilling hole 6 hole ground coal layers along being communicated with crack 4.Monitor afterwards the methane content of venthole, control the content of oxygen in air inlet, guarantee out gas drilling hole O
2concentration is not within the scope of methane explosion limit.O
2after concentration or methane content meet the demands, open out the valve that is communicated with of gas drilling hole 6 and 13 of gas-pipe lines, at the bottom of going out gas drilling hole 6 holes, drop into red-hot coke, the injected volume of coke is determined according to coal seam thickness, casing size, coal seam ignition point etc., use gas drilling hole 6 hole ground coal layers and light, set up initial flame range 11.Gasifying agent and coal seam 1 raw gas generating that reacts is discharged via gas-pipe line 13, controls CO
2oxygen enrichment flow makes flame range temperature be not less than spontaneous combustion of coal seam ignition temperature
After flame range temperature surpasses 1000 ℃, if when admission pressure fall surpasses 10%, with each 300～500Nm
3/ h increases CO
2oxygen enrichment flow, until flow reaches 3000～5000Nm
3between/h.So that burning things which may cause a fire disaster is in face of CO
2oxygen-enriched stream direction moves to air inlet boring direction, due to CO
2oxygen enrichment reacts with coal seam generating gasification, pyrolytic reaction:
C+O
2→CO
2-394kJ/mol
C+CO
2→2CO+173kJ/mol
C+H
2O→H
2+CO+131kJ/mol
Coal → H
2+ CH
4+ CO
2+ tar+semicoke+
Along being communicated with crack 4 and part coal bed gas being melted, expanded connection crack, form gradually gasification tunnel 12, be beneficial to coal gas and discharge; The heat simultaneously discharging is delivered in coal seam, promotes CH
4desorb, and dry coal seam increase gas permeability of coal seam, the methane after desorb and gasification gas, pyrolysis coal gas are in the lump by going out gas drilling hole 6 and gas-pipe line 13 discharges.
Maintain afterwards this flow and carry out reverse combustion (that is the propagation direction of flame front is contrary with the flow direction that feeds gas), and the pressure of Real-Time Monitoring air inlet boring 5.When air inlet, hole the shown pressure of pressure meter that 5 upper ends connect while there is significantly reducing (the pressure range of decrease be generally initial pressure 10～60%), show that initial flame range 11 extends near air inlet holes at the bottom of 5 holes.When air inlet boring 5 is when going out gas drilling hole 6 pressure and be more or less the same (differential pressure is less than 0.3MPa), show: the lower end of air inlet boring 5 and the gasification tunnel 12 going out between the lower end of gas drilling hole 6 successfully construct.
Gasification tunnel 12 completes after structure, increases from the air inlet CO that 5 upper ends supply with to down-hole that holes
2the oxygen concentration of oxygen rich gas (increasing by 2～5% every day) to improve reaction zone temperature, and is carried out forward gasification (that is, the propagation direction of flame front with to feed flowing to of gas identical), assurance CO to 50～70%
2with the abundant haptoreaction in coal seam red-hot in gasification tunnel, to complete the gasification in coal seam between boring, because gasification space expands, geostatic stress effect manifests simultaneously, and under the acting in conjunction of heat effect, the coal seam of gasification tunnel periphery produces zone of fracture, accelerates coal bed gas and discharges.Specifically, according to coal seam dirt band thickness, water content, the situations such as the spacing of wells, to CO
2oxygen rich gas flow and/or oxygen concentration are adjusted.
The gasification gas of producing in the present invention, pyrolysis coal gas and coal bed gas are through going out after gas drilling hole discharge, for methane-generating.
Embodiment 3 is substantially the same manner as Example 2, difference is to adopt directed horizontal drilling technology to set up the passage of initial water pumping gas production, form the arrangement of the horizontal well 15 of U-shaped structure, this horizontal well is perpendicular to the main fissure direction in coal seam, and utilize peupendicular hole to go out gas drilling hole 6 and carry out draining, gas production is carried out in air inlet boring 5, complete after the initial mining of coal bed gas, set up flame range going out gas drilling hole 6, and start hot-working passage, synchronously gas displacing coal-bed, and complete coal seam gasification between boring, the present embodiment is described with reference to Fig. 6 and Fig. 7.Fig. 6 is according to the schematic diagram of a kind of coal bed gas of the present invention and the common mining method of coal, wherein adopt directed horizontal drilling technology extraction coal bed gas, and Fig. 7 is according to the schematic diagram of this coal bed gas and the common mining method of coal, wherein lights a fire and passage hot-working, be expanded into gasification tunnel, synchronously gas displacing coal-bed.The gasification gas that the present invention produces, pyrolysis coal gas and coal bed gas are through going out after gas drilling hole discharge, for methane-methanol production.
The present invention utilizes underground gasification to produce amount of heat, in heating coal seam, raising coal bed methane analytic ability, the passage that is used in CBM Fracturing expands greatly, can greatly improve methane output, fundamentally solves the low-permeability problem of Coalbed Methane In China reservoir.Meanwhile, underground gasification carries out chemistry utilization to the complete coal seam of coal bed gas extraction, contains a large amount of methane and carbon monoxide and hydrogen in institute's producing coal gas, by the conversion of surface technology, obtains clean methane.The present invention carries out co-development, comprehensive utilization to coal bed gas and coal seam itself, not only can greatly reduce production development cost, and can improve the output of final products methane, and the quality of coal gas has also obtained larger lifting, has realized adopting altogether of coal and coal bed gas.In addition, using carbonated fluid as machining mediums such as pressure break, gasifications, both improved methane analytic ability in coal seam, improved the coefficient of mining of coal bed gas, improve again the content of the effective gas component of fuel gas such as methane in underground gasified gas, the carbon dioxide producing in process can also recycle, and the present invention is a kind of low-carbon (LC), efficient, clean new method.
Below the present invention be have been described in detail, but the present invention is not limited to the specific embodiment described herein.It will be appreciated by those skilled in the art that in the case without departing from the scope of the present invention, can make other changes and distortion.Scope of the present invention is defined by the following claims.
Claims (21)
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| CN201210356627.1A CN103670338B (en) | 2012-09-21 | 2012-09-21 | A kind of coal bed gas and coal mining method altogether |
| AU2013317409A AU2013317409B2 (en) | 2012-09-21 | 2013-09-18 | Method for joint-mining of coalbed gas and coal |
| PCT/CN2013/083781 WO2014044192A1 (en) | 2012-09-21 | 2013-09-18 | Method for joint-mining of coalbed gas and coal |
| US14/430,086 US20150247385A1 (en) | 2012-09-21 | 2013-09-18 | Method for joint-mining of coalbed gas and coal |
| EP13838778.2A EP2899363A4 (en) | 2012-09-21 | 2013-09-18 | Method for joint-mining of coalbed gas and coal |
| ZA2015/02650A ZA201502650B (en) | 2012-09-21 | 2015-04-20 | Method for joint-mining of coalbed gas and coal |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2899363A1 (en) | 2015-07-29 |
| WO2014044192A1 (en) | 2014-03-27 |
| CN103670338B (en) | 2016-06-15 |
| AU2013317409B2 (en) | 2016-06-23 |
| AU2013317409A1 (en) | 2015-04-09 |
| ZA201502650B (en) | 2016-11-30 |
| US20150247385A1 (en) | 2015-09-03 |
| EP2899363A4 (en) | 2016-06-22 |
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Effective date of registration: 20170125 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 065001 Langfang City Development Zone of Hebei province Huaxiang Patentee before: ENN Coal Gasification Co., Ltd. |