CN104061013A - Method and device for improving permeability of low-permeability coal bed by utilizing freezing process - Google Patents
Method and device for improving permeability of low-permeability coal bed by utilizing freezing process Download PDFInfo
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- CN104061013A CN104061013A CN201410284535.6A CN201410284535A CN104061013A CN 104061013 A CN104061013 A CN 104061013A CN 201410284535 A CN201410284535 A CN 201410284535A CN 104061013 A CN104061013 A CN 104061013A
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Abstract
The invention discloses a method and a device for improving permeability of a low-permeability coal bed by utilizing a freezing process and belongs to the method and the device for improving the permeability of the coal bed. The device comprises a freezing circulating system, a refrigerating circulating system and a condensate water circulating system; the method comprises the following steps that freezing pipelines are arranged in a coal and rock mass by utilizing the principle of the freezing process after the layout of a roadway and a working face is finished; the refrigerating circulating system and the condensate water circulating system are installed in the roadway; deep holes are drilled for water injection in the coal and rock mass and the drilled holes are sealed; the refrigerating system runs for freezing; water injected into the drilled holes previously condenses after the freezing is finished, and the water has 9 percent of expansion rate after condensing, so that fractures in the coal and rock mass are increased; the refrigerating circulating system and the condensate water circulating system are shut off after the freezing is finished; the underground high-temperature environment coal and rock mass naturally unfreezes; the water is injected for hole sealing again after the water in the drilled holes in the coal and rock mass is unfrozen, and a freezing and thawing process is circulated; after several circulation, the fractures of the coal and rock mass are obviously increased; the permeability of the coal and rock mass is improved, and the extraction rate of occurrence gas in the coal and rock mass is improved.
Description
Technical field
The present invention relates to a kind of method and device that improves coal seam permeability, particularly a kind of freezing process of utilizing improves the infiltrative method of low-permeability coal seam and device.
Background technology
Along with the fast development of coal industry, safety of coal mines mining level is also carrying out innovation always and is improving.The mine of China 52% belongs to highly gassy mine, and gas control is the prerequisite that ensures mine safety High-efficient Production.Yet China is soft, low, high gas layer ratio is very high, and the main mining coal seams in mining area such as Huainan, the Huaibei, Sichuan, table mountain, Guizhou all belong to soft, low, high gas layer, for the extraction of gas or to take out in advance be in advance the effective means of administering gas.But due to the hypotonicity of low-permeability coal seam, gas is difficult to directly and fully extract out, so improve the permeability in coal seam, is conducive to the extraction of gas and takes out in advance.Nowadays, the low-permeability in coal seam deposits with not forming to compose the two large technology barriers that the effective extraction of gas is Chinese highly gassy mine safety in production development, and the former is the most directly reason of the latter.So the outlet that coal-bed gas is administered is to improve coal seam permeability.The method that existing energy relative efficiency improves coal seam permeability has hydrofracturing, organic solvent pressure break, loosening blasting, large diameter borehole, the intensive cloth of grid type hole, intersection cloth hole and presplitting controlled blasting etc., and to reach the high efficiency of gas control, need to make further research improving the infiltrative method in coal seam.
Summary of the invention
Technical problem: the object of this invention is to provide a kind of freezing process of utilizing and improve the infiltrative method of low-permeability coal seam and device, to realize the extraction rate that in highly gassy mine, gas is deposited in coal and rock tax that improves.
Technical scheme: the object of the present invention is achieved like this: improve low-permeability coal seam permeability and comprise method and apparatus; Improving low-permeability coal seam permeability method comprises the steps:
A. in tunnel, in coal body, get out the sealing water injecting drilling of distribution and freeze the pore that circulates, in the tunnel that arranges work plane, to arranging in freezing in coal body circulated pore, freeze circulation line, cooling cycle system and condensate water circulatory system are installed in tunnel;
B. in sealing water injecting drilling, inject water under high pressure, make water under high pressure can fully be full of the crack in coal body, then sealing water injecting drilling is carried out to sealing of hole;
C. the refrigerant freezing in circulation line of coal body is used cool brine, because its set point is lower than the set point of pure water, can reach-10 ℃, can be used as effective refrigerant; Cooling cycle system adopts liquefied ammonia refrigeration, by evaporimeter and the cool brine freezing in circulation line, carries out interchange of heat; Condensate water circulatory system is utilized water circulation by the heat absorption in the circulation of refrigeration ammonia and is delivered to aboveground.Its process of refrigerastion is: the cool brine freezing in brine circulating system in circulation pipe absorbs coal seam heat, transfers heat to the liquefied ammonia in evaporimeter in brine tank; Liquefied ammonia in ammonia circulation becomes saturated vapor ammonia, then by ammonia compressor, being compressed into superheated vapor, to enter ammonia condenser cooling, high-pressure liquid ammonia from ammonia condenser through ammonia storage tank, through choke valve flow into evaporimeter liquefied ammonia in evaporimeter, gasify absorb around the heat of salt solution; The cooling water of cooling water recirculation system circulates in water pump, water condenser and pipeline, and the heat of coal seam heat and compressor generation is delivered to aboveground;
D. coal body is freezed, the water that freezes to make Central Plains, coal body crack to compose to contain and the water under high pressure of injection condense, and after water condenses, have 9% expansion rate, and crack expands; After having freezed, close cooling cycle system and condensate water circulatory system, after this hot environment coal and rock of down-hole is thawed naturally, water filling sealing of hole circulating freezing resistance process again after the water thawing in coal and rock boring, after circulation, the crack of coal body obviously increases for several times, and the permeability of coal body has obtained increase, the extraction rate of gas is improved, and more benefits the extraction of gas.
Improving the infiltrative device of low-permeability coal seam comprises: freeze the circulating system, cooling cycle system and condensate water circulatory system;
The described circulating system of freezing comprises: freeze circulation pipe and brine pump; Freeze connecting and composing and freeze the circulating system with brine pump of circulation pipe, in freezing the circulating system, pass through cool brine;
Described cooling cycle system comprises: evaporimeter, compressor, storage ammonia device, choke valve and ammonia condenser; Evaporimeter, compressor, storage ammonia device, choke valve and ammonia condenser are end to end, form cooling cycle system, wherein, by evaporimeter with to freeze the circulating system associated, by ammonia condenser and condensate water circulatory system relationship;
Described condensate water circulatory system comprises: water pump and water condenser; Water pump and water condenser are end to end, form condensate water circulatory system;
The described circulation pipe that freezes comprises: inner and outer tubes, outer tube is blind pipe, and inner tube is inserted into extremely nearly outer tube inner bottom part in outer tube, and inner tube other end mouth of pipe from the outer tube other end passes as outlet, and sealed by the outer mouth of pipe, in inner tube dress, out on the outer tube wall of one end of the mouth of pipe, there is import; The outlet of inner tube is connected with the import of outer tube and forms the circulating system.
Beneficial effect: ratio juris is freezed in utilization of the present invention, use " ammonia-salt solution " freezing system manually to freeze coal seam, the contained pore water setting expansion of water under high pressure and coal seam itself that boring is injected, increase the crack in coal seam, reduced simultaneously gas activity, reduced gas expansion energy, played the effect that prevents Gas Outburst.After nature of coal seam is thawed, pore water evaporation, the crack that coal seam stays increases.Compared with the conventional method, the method applicability the present invention relates to is strong, is subject to hardly the restriction of formation condition, freezing zone form take freezing pipe center as the center of circle, radius as R radially expansion in time freeze coal cylinder.Because the thermal conductivity of ice is four times of water, along with the continuous cooling of freezing pipe, freezing coal body diameter constantly increases, can be by regulation and control refrigeration system and freeze-off time, the freezing area thickness of Artificial Control, thereby control flexibly fracturing region, make fracturing effect more obvious, more fully improve the permeability in coal seam.
Accompanying drawing explanation
Fig. 1 is freezing process system pipeline arrangement diagram of the present invention.
Fig. 2 is the circulation pipe sectional structure chart that freezes of the present invention.
In figure: 1, low-permeability coal seam; 2, freeze circulation pipe; 3, sealing water injecting drilling; 4, sealing of hole; 5, brine pump; 6, evaporimeter; 7, compressor; 8, storage ammonia device; 9, choke valve; 10, ammonia condenser; 11, water pump; 12, water condenser; 13, outer tube; 14, inner tube.
The specific embodiment
Embodiment 1: improve low-permeability coal seam permeability and comprise method and apparatus; Improving low-permeability coal seam permeability method comprises the steps:
A. in tunnel, in coal body, get out the sealing water injecting drilling of distribution and freeze the pore that circulates, in the tunnel that arranges work plane, to arranging in freezing in coal body circulated pore, freeze circulation line (cool brine circulation line), cooling cycle system (ammonia recycle system) and condensate water circulatory system are installed in tunnel;
B. in sealing water injecting drilling, inject water under high pressure, make water under high pressure can fully be full of the crack in coal body, then sealing water injecting drilling is carried out to sealing of hole;
C. the refrigerant freezing in circulation line of coal body is used cool brine, because its set point is lower than the set point of pure water, can reach-10 ℃, can be used as effective refrigerant; Cooling cycle system adopts liquefied ammonia refrigeration, by evaporimeter and the cool brine freezing in circulation line, carries out interchange of heat; Condensate water circulatory system is utilized water circulation by the heat absorption in the circulation of refrigeration ammonia and is delivered to aboveground.Its process of refrigerastion is: the cool brine 13 that freezes 2 li of circulation pipes in brine circulating system absorbs coal seam 1 heat, transfers heat to the liquefied ammonia in evaporimeter 6 in brine tank; Liquefied ammonia in ammonia circulation becomes saturated vapor ammonia, by ammonia compressor 7, being compressed into superheated vapor again, to enter ammonia condenser 10 cooling, high-pressure liquid ammonia, gasifies and absorbs the heat of salt solution around through choke valve 9 inflow evaporimeter 6 liquefied ammonia through ammonia storage tank 8 from ammonia condenser in evaporimeter; The cooling water of cooling water recirculation system circulates in water pump 11, water condenser 12 and pipeline, and the heat of coal seam 1 heat and compressor 7 generations is delivered to aboveground;
D. coal body is freezed, the water that freezes to make Central Plains, coal body crack to compose to contain and the water under high pressure of injection condense, and after water condenses, have 9% expansion rate, and crack expands; After having freezed, close cooling cycle system and condensate water circulatory system, after this hot environment coal and rock of down-hole is thawed naturally, water filling sealing of hole circulating freezing resistance process again after the water thawing in coal and rock boring, after circulation, the crack of coal body obviously increases for several times, and the permeability of coal body has obtained increase, the extraction rate of gas is improved, and more benefits the extraction of gas.
Improving the infiltrative device of low-permeability coal seam comprises: freeze the circulating system, cooling cycle system and condensate water circulatory system;
The described circulating system of freezing comprises: freeze circulation pipe 2 and brine pump 5; Freeze the pipeline of circulation pipe 2 and brine pump 5 and connect and compose and freeze the circulating system, in freezing the circulating system by cool brine 13;
Described cooling cycle system comprises: evaporimeter 6, compressor 7, storage ammonia device 8, choke valve 9 and ammonia condenser 10; Evaporimeter 6, compressor 7, storage ammonia device 8, choke valve 9 and ammonia condenser 10 are end to end, form cooling cycle system, wherein, by evaporimeter 6 with to freeze the circulating system associated, by ammonia condenser 10 and condensate water circulatory system relationship;
Described condensate water circulatory system comprises: water pump 11 and water condenser 12; Water pump 11 and water condenser 12 are end to end, form condensate water circulatory system;
The described circulation pipe that freezes comprises: inner tube 14 and outer tube 13, outer tube 13 is blind pipe, inner tube 14 is inserted in outer tube 13 to nearly outer tube 13 inner bottom parts, inner tube 14 other ends mouth of pipe from outer tube 13 other ends passes as outlet, and sealed by the outer mouth of pipe, in inner tube dress, out on the outer tube wall of one end of the mouth of pipe, there is import; The outlet of inner tube is connected with the import of outer tube and forms the circulating system.
Claims (2)
1. utilize freezing process to improve the infiltrative method of low-permeability coal seam, it is characterized in that: improve low-permeability coal seam permeability method and comprise the steps:
A. in tunnel, in coal body, get out the sealing water injecting drilling of distribution and freeze the pore that circulates, in the tunnel that arranges work plane, to arranging in freezing in coal body circulated pore, freeze circulation line, cooling cycle system and condensate water circulatory system are installed in tunnel;
B. in sealing water injecting drilling, inject water under high pressure, make water under high pressure can fully be full of the crack in coal body, then sealing water injecting drilling is carried out to sealing of hole;
C. the refrigerant freezing in circulation line of coal body is used cool brine, because its set point is lower than the set point of pure water, can reach-10 ℃, can be used as effective refrigerant; Cooling cycle system adopts liquefied ammonia refrigeration, by evaporimeter and the cool brine freezing in circulation line, carries out interchange of heat; Condensate water circulatory system is utilized water circulation by the heat absorption in the circulation of refrigeration ammonia and is delivered to aboveground.Its process of refrigerastion is: the cool brine freezing in brine circulating system in circulation pipe absorbs coal seam heat, transfers heat to the liquefied ammonia in evaporimeter in brine tank; Liquefied ammonia in ammonia circulation becomes saturated vapor ammonia, then by ammonia compressor, being compressed into superheated vapor, to enter ammonia condenser cooling, high-pressure liquid ammonia from ammonia condenser through ammonia storage tank, through choke valve flow into evaporimeter liquefied ammonia in evaporimeter, gasify absorb around the heat of salt solution; The cooling water of cooling water recirculation system circulates in water pump, water condenser and pipeline, and the heat of coal seam heat and compressor generation is delivered to aboveground;
D. coal body is freezed, the water that freezes to make Central Plains, coal body crack to compose to contain and the water under high pressure of injection condense, and after water condenses, have 9% expansion rate, and crack expands; After having freezed, close cooling cycle system and condensate water circulatory system, after this because the hot environment coal and rock of down-hole is thawed naturally, water filling sealing of hole circulating freezing resistance process again after the water thawing in coal and rock boring, after circulation, the crack of coal body obviously increases for several times, and the permeability of coal body has obtained increase, the extraction rate of gas is improved, more benefits the extraction of gas.
2. a kind of device that utilizes freezing process to improve low coal body permeability method according to claim 1, is characterized in that: improve the infiltrative device of low-permeability coal seam and comprise: freeze the circulating system, cooling cycle system and condensate water circulatory system;
The described circulating system of freezing comprises: freeze circulation pipe and brine pump; Freeze the pipeline of circulation pipe and brine pump and connect and compose and freeze the circulating system, in freezing the circulating system, pass through cool brine;
Described cooling cycle system comprises: evaporimeter, compressor, storage ammonia device, choke valve and ammonia condenser; Evaporimeter, compressor, storage ammonia device, choke valve and ammonia condenser are end to end, form cooling cycle system, wherein, by evaporimeter with to freeze the circulating system associated, by ammonia condenser and condensate water circulatory system relationship;
Described condensate water circulatory system comprises: water pump and water condenser; Water pump and water condenser are end to end, form condensate water circulatory system;
The described circulation pipe that freezes comprises: inner and outer tubes, outer tube is blind pipe, and inner tube is inserted into extremely nearly outer tube inner bottom part in outer tube, and inner tube other end mouth of pipe from the outer tube other end passes as outlet, and sealed by the outer mouth of pipe, in inner tube dress, out on the outer tube wall of one end of the mouth of pipe, there is import; The outlet of inner tube is connected with the import of outer tube and forms the circulating system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410284535.6A CN104061013B (en) | 2014-06-23 | 2014-06-23 | One utilizes freezing process to improve the infiltrative method of low-permeability coal seam and device |
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| CN201410284535.6A CN104061013B (en) | 2014-06-23 | 2014-06-23 | One utilizes freezing process to improve the infiltrative method of low-permeability coal seam and device |
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| CN104061013B CN104061013B (en) | 2016-02-10 |
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| CN110847151B (en) * | 2019-10-23 | 2021-07-06 | 河南城建学院 | Method for repairing tunnel underpass cavity by freezing method |
| CN112412417A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | The coal seam hydraulic power cave-making combined drilling heat injection permeability-increasing pumping-promoting method |
| CN112412421A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Method for strengthening pumping promotion by heat injection of cross-layer drilling and hydraulic punching |
| CN112412417B (en) * | 2020-11-05 | 2022-11-18 | 河南理工大学 | Method for promoting pumping of coal seam by combining hydraulic cave building with drilling, heat injection, permeability increase |
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