CN104061013B - One utilizes freezing process to improve the infiltrative method of low-permeability coal seam and device - Google Patents
One utilizes freezing process to improve the infiltrative method of low-permeability coal seam and device Download PDFInfo
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- CN104061013B CN104061013B CN201410284535.6A CN201410284535A CN104061013B CN 104061013 B CN104061013 B CN 104061013B CN 201410284535 A CN201410284535 A CN 201410284535A CN 104061013 B CN104061013 B CN 104061013B
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Abstract
One utilizes freezing process to improve the infiltrative method of low-permeability coal seam and device, belongs to the method and device that improve coal seam permeability.Device comprises: freeze cycle system, cooling cycle system and condensate water circulatory system; Method is after tunnel and work plane have been arranged, utilization is freezed ratio juris and is arranged in coal and rock and freeze pipeline, cooling cycle system and condensate water circulatory system are installed in tunnel, in coal body, carry out drilling deep hole water filling and close boring, running refrigerating system is freezed, freezing complete after, the water condensation that previously boring is injected, water-setting has the expansion rate of 9%, causes the crack in coal and rock to increase; After having freezed, close cooling cycle system and condensate water circulatory system, 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.For several times after circulation, the crack of coal body obviously increases, and improves the permeability of coal and rock, realizes composing the raising of depositing the extraction rate of gas in coal and rock.
Description
Technical field
The present invention relates to a kind of method and device, particularly one improving coal seam permeability utilizes freezing process to improve 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 also carries out innovation and raising always.The mine of China 52% belongs to highly gassy mine, and gas control is the prerequisite ensureing mine safety High-efficient Production.But China is soft, low, high gas layer ratio is very high, 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 gas extraction or to take out in advance be in advance administer the effective means of gas.But due to the hypotonicity of low-permeability coal seam, gas is difficult to directly and extracts out fully, so the permeability improving coal seam is conducive to the extraction of gas and takes out in advance.Nowadays, the low-permeability in coal seam deposits with not formed 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 latter's the most directly reason.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 hole of grid type, intersection cloth hole and presplitting controlled blasting etc., and the high efficiency of gas control will be reached, need the infiltrative method to improving coal seam to make further research.
Summary of the invention
Technical problem: the object of this invention is to provide one and utilize freezing process to improve the infiltrative method of low-permeability coal seam and device, composes the extraction rate of depositing gas to realize improving coal and rock in highly gassy mine.
Technical scheme: the object of the present invention is achieved like this: improve low-permeability coal seam permeability and comprise method and apparatus; Improve low-permeability coal seam permeability method to comprise the steps:
A. in coal body, closed water injecting drilling and the freeze cycle pore of distribution is got out in tunnel, in the tunnel arranging work plane, in the freeze cycle pore in coal body, arrange freeze cycle pipeline, cooling cycle system and condensate water circulatory system are installed in tunnel;
B. in closed water injecting drilling, inject water under high pressure, enable water under high pressure fully be full of crack in coal body, then closed water injecting drilling is carried out sealing of hole;
Refrigerant in the freeze cycle pipeline of c. coal body uses cool brine, because its set point is lower than the set point of pure water, can reach-10 DEG C, can as effective refrigerant; Cooling cycle system adopts liquefied ammonia refrigeration, carries out interchange of heat by the cool brine in evaporimeter and freeze cycle pipeline; Condensate water circulatory system utilizes 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 in brine circulating system in freeze cycle 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 is compressed into superheated vapor by ammonia compressor and enters ammonia condenser cooling, and high-pressure liquid ammonia through ammonia storage tank from ammonia condenser, flows into evaporimeter liquefied ammonia through choke valve and gasify in evaporimeter the heat of absorption surrounding saline; The cooling water of cooling water recirculation system circulates in water pump, water condenser and pipeline, is delivered to aboveground by the heat that coal seam heat and compressor produce;
D. freeze coal body, freeze to make coalmass crevasse Central Plains compose the water under high pressure condensation of water and the injection contained, have the expansion rate of 9% after water condensation, 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, for several times after circulation, the crack of coal body obviously increases, and the permeability of coal body obtains increase, the extraction rate of gas is improved, and more benefits the extraction of gas.
Improve the infiltrative device of low-permeability coal seam to comprise: freeze cycle system, cooling cycle system and condensate water circulatory system;
Described freeze cycle system comprises: freeze cycle pipe and brine pump; Freeze cycle pipe connect and compose freeze cycle system with brine pump, in freeze cycle 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 and freeze cycle system relationship, 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 end to end, form condensate water circulatory system;
Described freeze cycle pipe comprises: inner and outer tubes, outer tube is blind pipe, and interior pipe is inserted into nearly outer tube inner bottom part in outer tube, and the interior pipe other end passes as outlet from the outer mouth of pipe of the outer tube other end, and closed by the outer mouth of pipe, the outer tube wall of interior pipe dress out one end of the mouth of pipe there is import; The outlet of interior pipe is connected with the import of outer tube and forms the circulating system.
Beneficial effect: the present invention utilizes and freezes ratio juris, " ammonia-salt solution " freezing system is used to carry out manual pipe jacking to coal seam, the water under high pressure that boring is injected and the pore water setting expansion contained by coal seam itself, increase the crack in coal seam, reduce the activity of gas simultaneously, reduce gas flow patterns, serve the effect preventing Gas Outburst.After thawing to nature of coal seam, pore water evaporates, and the crack that coal seam stays increases.Compared with the conventional method, the method applicability that the present invention relates to is strong, hardly by the restriction of formation condition, freezing zone formed with freezing pipe center be the center of circle, radius radially expand in time for R freeze coal cylinder.Thermal conductivity due to ice is four times of water, along with the continuous cooling of freezing pipe, freeze coal body diameter constantly to increase, can by regulation and control refrigeration system and freeze-off time, the freezing area thickness of Artificial Control, thus control fracturing region flexibly, 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 freeze cycle pipe sectional structure chart of the present invention.
In figure: 1, low-permeability coal seam; 2, freeze cycle pipe; 3, water injecting drilling is closed; 4, sealing of hole; 5, brine pump; 6, evaporimeter; 7, compressor; 8, ammonia device is stored up; 9, choke valve; 10, ammonia condenser; 11, water pump; 12, water condenser; 13, outer tube; 14, interior pipe.
Detailed description of the invention
Embodiment 1: improve low-permeability coal seam permeability and comprise method and apparatus; Improve low-permeability coal seam permeability method to comprise the steps:
A. in coal body, closed water injecting drilling and the freeze cycle pore of distribution is got out in tunnel, in the tunnel arranging work plane, in the freeze cycle pore in coal body, arrange freeze cycle pipeline (cool brine circulation line), cooling cycle system (ammonia recycle system) and condensate water circulatory system are installed in tunnel;
B. in closed water injecting drilling, inject water under high pressure, enable water under high pressure fully be full of crack in coal body, then closed water injecting drilling is carried out sealing of hole;
Refrigerant in the freeze cycle pipeline of c. coal body uses cool brine, because its set point is lower than the set point of pure water, can reach-10 DEG C, can as effective refrigerant; Cooling cycle system adopts liquefied ammonia refrigeration, carries out interchange of heat by the cool brine in evaporimeter and freeze cycle pipeline; Condensate water circulatory system utilizes water circulation by the heat absorption in the circulation of refrigeration ammonia and is delivered to aboveground.Its process of refrigerastion is: in brine circulating system, the cool brine 13 of freeze cycle pipe 2 li 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, be compressed into superheated vapor by ammonia compressor 7 again to enter ammonia condenser 10 and cool, high-pressure liquid ammonia through ammonia storage tank 8 from ammonia condenser, flows into evaporimeter 6 liquefied ammonia through choke valve 9 and gasifies in evaporimeter and absorb the heat of surrounding saline; The cooling water of cooling water recirculation system circulates in water pump 11, water condenser 12 and pipeline, is delivered to aboveground by the heat that coal seam 1 heat and compressor 7 produce;
D. freeze coal body, freeze to make coalmass crevasse Central Plains compose the water under high pressure condensation of water and the injection contained, have the expansion rate of 9% after water condensation, 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, for several times after circulation, the crack of coal body obviously increases, and the permeability of coal body obtains increase, the extraction rate of gas is improved, and more benefits the extraction of gas.
Improve the infiltrative device of low-permeability coal seam to comprise: freeze cycle system, cooling cycle system and condensate water circulatory system;
Described freeze cycle system comprises: freeze cycle pipe 2 and brine pump 5; Pipeline and the brine pump 5 of freeze cycle pipe 2 connect and compose freeze cycle system, by cool brine 13 in freeze cycle system;
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 and freeze cycle system relationship, 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 end to end, form condensate water circulatory system;
Described freeze cycle pipe comprises: interior pipe 14 and outer tube 13, outer tube 13 is blind pipe, interior pipe 14 is inserted in outer tube 13 to nearly outer tube 13 inner bottom part, interior pipe 14 other end passes as outlet from the outer mouth of pipe of outer tube 13 other end, and closed by the outer mouth of pipe, the outer tube wall of interior pipe dress out one end of the mouth of pipe there is import; The outlet of interior pipe 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 coal body, closed water injecting drilling and the freeze cycle pore of distribution is got out in tunnel, in the tunnel arranging work plane, in the freeze cycle pore in coal body, arrange freeze cycle pipeline, cooling cycle system and condensate water circulatory system are installed in tunnel;
B. in closed water injecting drilling, inject water under high pressure, enable water under high pressure fully be full of crack in coal body, then closed water injecting drilling is carried out sealing of hole;
Refrigerant in the freeze cycle pipeline of c. coal body uses cool brine, because its set point is lower than the set point of pure water, can reach-10 DEG C, can as effective refrigerant; Cooling cycle system adopts liquefied ammonia refrigeration, carries out interchange of heat by the cool brine in evaporimeter and freeze cycle pipeline; Condensate water circulatory system utilizes 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 in brine circulating system in freeze cycle 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 is compressed into superheated vapor by ammonia compressor and enters ammonia condenser cooling, and high-pressure liquid ammonia through ammonia storage tank from ammonia condenser, flows into evaporimeter liquefied ammonia through choke valve and gasify in evaporimeter the heat of absorption surrounding saline; The cooling water of cooling water recirculation system circulates in water pump, water condenser and pipeline, is delivered to aboveground by the heat that coal seam heat and compressor produce;
D. freeze coal body, freeze to make coalmass crevasse Central Plains compose the water under high pressure condensation of water and the injection contained, have the expansion rate of 9% after water condensation, 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, for several times after circulation, the crack of coal body obviously increases, and the permeability of coal body obtains increase, the extraction rate of gas is improved, more benefits the extraction of gas.
2. a kind of device utilizing freezing process to improve low-permeability coal seam permeability method according to claim 1, is characterized in that: improve the infiltrative device of low-permeability coal seam and comprise: freeze cycle system, cooling cycle system and condensate water circulatory system;
Described freeze cycle system comprises: freeze cycle pipe and brine pump; The pipeline of freeze cycle pipe and brine pump connect and compose freeze cycle system, in freeze cycle 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 and freeze cycle system relationship, 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 end to end, form condensate water circulatory system;
Described freeze cycle pipe comprises: inner and outer tubes, outer tube is blind pipe, and interior pipe is inserted into nearly outer tube inner bottom part in outer tube, and the interior pipe other end passes as outlet from the outer mouth of pipe of the outer tube other end, and closed by the outer mouth of pipe, the outer tube wall of interior pipe dress out one end of the mouth of pipe there is import; The outlet of interior pipe is connected with the import of outer tube and forms the circulating system.
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