RU2342531C1 - Combined method of loosening coal massif and facility for implementation of this method - Google Patents

Combined method of loosening coal massif and facility for implementation of this method Download PDF

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RU2342531C1
RU2342531C1 RU2007124009/03A RU2007124009A RU2342531C1 RU 2342531 C1 RU2342531 C1 RU 2342531C1 RU 2007124009/03 A RU2007124009/03 A RU 2007124009/03A RU 2007124009 A RU2007124009 A RU 2007124009A RU 2342531 C1 RU2342531 C1 RU 2342531C1
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pneumatic
pressure
compressed air
well
cartridge
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RU2007124009/03A
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Russian (ru)
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Анатолий Владимирович Джигрин (RU)
Анатолий Владимирович Джигрин
Юрий Владимирович Горлов (RU)
Юрий Владимирович Горлов
Константин Владимирович Горлов (RU)
Константин Владимирович Горлов
Дмитрий Иванович Адамидзе (RU)
Дмитрий Иванович Адамидзе
Андрей Юрьевич Горлов (RU)
Андрей Юрьевич Горлов
Виктор Прокопьевич Тациенко (RU)
Виктор Прокопьевич Тациенко
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ЗАО "Межведомственная комиссия по взрывному делу при Академии горных наук" (ЗАО "МВК по ВД при АГН")
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Abstract

FIELD: mining.
SUBSTANCE: invention refers to mining and relates to preparing coal massif to extraction. The method includes drilling bores into work zone of the coal bed, supplying carbon dioxide under pressure not lower, than threshold, into bores, pumping water under pressure lower, than hydro-break of the bed, till complete water-saturation of the work zone. Also compressed air of high pressure is supplied to increase pressure in a bore above hydro-break of coal bed in the work zone, with supplying compressed air of high pressure in a pulse mode separately, as well as simultaneously, at any combination and within a certain range of compressed air pressures with specified frequency, depending on physic-mechanical properties and structure of the coal bed. Also there is suggested a facility for implementation of this method.
EFFECT: upgraded efficiency of coal bed degassing.
5 cl, 14 dwg

Description

The invention relates to the coal industry and can be used to soften the coal mass and increase the efficiency of degassing of the coal seam.
A known method of softening a coal seam, which allows to reduce the strength properties of coal by drilling wells in a coal seam, supplying carbon dioxide to them at a pressure equal to or greater than a threshold, and maintaining the wells at this pressure until an equilibrium regime is established and dispersing coal around each well, as well as To increase the efficiency of softening the coal mass between the wells for injection of carbon dioxide, additional wells with explosive charges of explosives or with gasdines are located ammunition cartridges (GP), which after explosive blasting or triggering of the GP in full camlet mode create explosive cracking zones. In this case, the blasting of the wells is carried out after dispersion around adjacent wells between themselves, and the blasting of explosive charges or cycles of operation of the GP is carried out before the zones of explosive crack formation around adjacent blast holes are connected together [1].
The disadvantages of this method are:
- treatment with carbon dioxide reduces the strength of coal, but without its destruction by large cracks, which is a necessary condition for effective degassing;
- when using explosive or GP charges, the drilling volume doubles, that is, the cost of the method increases sharply;
- the use of explosive charges or GP allows only one-time impact on the coal seam, that is, eliminates the possibility of repeated exposure to the processed coal mass;
- drilling holes with a length of about 4 m to implement this method only allows you to get a small area of softening and does not allow you to use it for degassing a coal mass.
The closest analogue adopted for the prototype of this invention in terms of the method according to the technical essence and the achieved result is the "Method of softening a coal seam (options)" [2]. This method involves drilling wells in the formation into the treated zone, supplying carbon dioxide to them under a pressure not lower than the threshold. According to one of the options for implementing this method, the pressure in the wells is increased above the threshold, but below the hydraulic fracturing by pumping water into the wells to completely saturate the treated zone. After that, the water pressure in the wells is increased until hydraulic fracturing and water injection is continued until the pressure in the well is below the threshold. In another embodiment, after complete saturation of the treated zone and an increase in pressure in the wells prior to hydraulic fracturing, the water supply to the wells is periodically stopped and injected again to the maximum achievable hydraulic fracture pressure until it drops below the threshold.
The disadvantage of this method is that the effective radius of softening of the coal seam (according to experimental data of 2-3 m) is limited by the radius of exposure to carbon dioxide (especially for hard coals), since the implementation of this method does not form a network of small and medium cracks and this dramatically reduces formation degassing efficiency. The disadvantages of this method can also be attributed to the fact that the implementation of this method requires special high-pressure pumps.
The purpose of this invention is the development of a combined method of softening the coal mass and devices for its implementation, the use of which increases the efficiency of degassing of the coal seam.
The goal in terms of the method is achieved by the fact that a combined method of softening the coal seam is proposed, including drilling wells in the coal seam into the treated area of the coal mass, supplying it to the wells under pressure not lower than the threshold carbon dioxide, injecting into the wells under water pressure, until the water being processed is fully saturated zones, different from the prototype in that after performing the above operations, the water pressure in the well is increased to hydraulic fracturing due to the flow in it in a pulse high-pressure air using a device for combined softening of a coal seam.
The method is implemented as follows (figa). From the mine 1 to the coal seam 2, wells 3 are drilled at a distance of 10 ÷ 15 m from each other. A device for combined softening of the coal seam 4 is inserted into the well 3 and fed forward along the well from the mouth 12 of the well 3 to the end of the unloading zone of the mine 11 at 5–10 m, but not less than 5 m (the minimum radius of the mine unloading zone), using the feed rod 5 of the drilling rig 6. Device 4 is connected to two lines of reinforced hoses. One line is used to inject into the well 3 through one of the channels in the pneumatic pack 7 of the device 4 under the pressure of carbon dioxide, and then through the same line through the same channel under water pressure, the second air line connected to the source of high-pressure compressed air is used for compressed air to enter the working cavity of the pneumatic packer 7 and the multi-section pneumatic pulse cartridge 8 of the device 4 (these lines are not shown in FIGS. 1a and 1b). For technical reasons, the length of the device 4 should not exceed 15 m. The well 3 is sealed with a pneumatic packer (sealant) 7 included in the design of the device 4 (figa). Through a pneumatic packer (sealant) 7 device 4, carbon dioxide is supplied to the well under a pressure of at least a threshold pressure of 2.8 MPa, while the specific consumption of liquefied carbon dioxide is about 2 kg per m 3 of coal mass. After that, water is also supplied under pressure to the well through the pneumatic packer (sealant) 7 of device 4 until the water is saturated with carbon-softened carbon dioxide in the treated zone, while water is supplied through the pneumatic packer (sealant) 7 of device 4 under a pressure of 1 ÷ 3 MPa. Then, due to the pulsed action of high pressure compressed air 20 ÷ 70 MPa using a multi-section pneumo-impulse cartridge 8, which is part of the design of device 4, the water pressure in the well is increased to 7 ÷ 8 MPa and higher. This leads to an avalanche-like opening of pores and cracks and as a result to hydraulic fracturing of the coal seam in the treated zone 10 (figa). After treating the coal seam in the first well using the device 4, the well 3 is depressurized (the compressed air pressure in the air pack 7 is released), the device 4 is moved to the next well 3 and the above operations are repeated in the second well (Fig. 1b) and so on.
When the length of the wells is more than 20 m, the method is implemented as follows (figa). From a mine 1 into a coal seam 2, wells 3 are drilled at a distance of 10 ÷ 15 m from each other. At the mouth of a well 3, a modification of the base device for combined softening of the coal seam 4 is installed, which has two pneumatic packers (sealant) in its design 7. Modification of the base device 4 is connected to two lines of reinforced hoses. One line is used to inject into the well 3 through one of the channels in the tail pneumatic packer 7 of device 4 under pressure of carbon dioxide, and then through the same line through the same channel under water pressure, a second air line connected to the source of high pressure compressed air, and it is used for the supply of compressed air to the working cavities of the tail and head pneumatic packers 7 and to the multi-section pneumatic impulse cartridge 8 of device 4 (these lines are not shown in FIGS. 2a and 2b). Then, the modified device 4 is fed forward to the bottom face 9 of the well 3, using the feed rod 5 of the drilling rig 6. The well 3 in the first installed position is sealed with two pneumatic packers (sealants) 7 included in the design of the modified device 4. Through the tail pneumatic packer 7 of the device 4 is produced the supply of carbon dioxide into the well at a pressure not lower than the threshold of 2.8 MPa, while the specific consumption of liquefied carbon dioxide is about 2 kg per m 3 of coal mass. After that, water is supplied to the well until the water mass of carbon dioxide softened by carbon dioxide is fully saturated in the treated zone, while water is supplied through the tail pneumatic packer 7, modified device 4 under a pressure of 1 ÷ 3 MPa. Then, due to the pulsed action of high pressure compressed air 20 ÷ 70 MPa using a multi-section pneumo-impulse cartridge 8, which is part of the design of device 4, the water pressure in the well is increased to 7 ÷ 8 MPa and higher. This leads to an avalanche-like opening of pores and cracks and, as a result, to hydraulic fracturing of the coal seam in the treated zone 10 (Fig. 2a).
After treating the coal seam at the first installation position of the device 4, the well 3 is depressurized (relieve compressed air pressure in the pneumatic packers), the device is moved along the well 3 back to the wellhead 12 to the length L of the modified device 4 and the above operations are repeated at the second position (Fig.2b) and so on down the length of the well. Thus, a coal seam is processed along the length of the well to the unloading zone 11 of the mine, but not less than 5 m (the minimum radius of the unloading zone of the mine) from the wellhead 12 of the well 3. Next, all of the above operations are repeated on the second well and so on, processing the specified amount coal seam array.
If there are several devices 4 for combined softening of the coal mass during the implementation of the above methods, it is possible to treat the coal seam from several wells simultaneously.
Known "Pneumatic cartridge" [3], which is intended for the destruction of rocks by the energy of compressed air. The "pneumatic cartridge" cannot be used directly in the proposed devices, since if there is one working chamber and a control device, it will be able to process a relatively small section of the coal mass, which will lead to the need to move the device along the length of the well to completely process the given section of the coal mass, it does not seem the ability to implement the proposed combined method of softening a coal seam due to the impossibility of simultaneously affecting relatively long n area of the coal massif and to form flows in the pulsed mode of compressed air from the exhaust openings of the normal, oncoming and opposite directions.
The closest in technical essence and the achieved result of the invention analogue in terms of a device for combined softening of a coal seam, adopted as a prototype, is the "Gas dynamic cartridge" [4].
The disadvantages of the prototype:
1. The control element, to actuate the gas-dynamic cartridge, is the diaphragm (shear disk) of a single action. Therefore, after each actuation of the cartridge, it should be removed from the well (hole) for recharging (installing a new diaphragm). This feature of the gas-dynamic cartridge (prototype) excludes the possibility of using it as a multiple pulsed action of compressed air flowing from the exhaust holes of the cartridge onto the coal mass.
2. The direction of the vectors of the jets of compressed air flowing from the exhaust openings of the gas-dynamic cartridge have an unambiguous direction along the normal to the longitudinal axis of the cartridge and the walls of the well (borehole) and do not interact with each other.
3. The absence of check valves in the bypass channels of the spools dividing the cartridge into separate sections (chambers), leads to turbulence in the flow of compressed air inside the cartridge along the most random paths. Intensive mixing of the jet in a turbulent flow leads to a relatively large loss of energy and, as a result, an unstable pressure over the entire length of the created front of the air wave.
The aim of the invention in terms of the device is to develop a device for implementing a method of combined softening of a coal mass, which will allow to seal a well in the treated zone of a coal mass and act on the mass of carbon dioxide, water and compressed air in a pulsed mode both separately and simultaneously in any combination and in any pressure range.
This goal is achieved by the fact that the device for combined softening of the coal seam contains a pneumatic packer (sealant), mounted on the end in the rear of the pneumatic pulse cartridge, or two pneumatic packers (sealant), mounted respectively on the ends of the multi-section pneumatic pulse cartridge. Moreover, in the pneumatic packer located in the rear part of the device, there are communication lines, which are a system of supply channels for supplying carbon dioxide, water and separate supply of compressed air to the well under pressure and into the multi-section pneumatic impulse cartridge.
A distinctive feature of this invention is that it is possible to combine impact on the coal mass with carbon dioxide, water and compressed air in a pulsed mode both separately and simultaneously in any combination and at any given frequency, which increases the reliability and efficiency of softening the coal mass. In addition, the design of a multi-section pneumatic impulse cartridge, which is part of a device for combined softening of a coal seam, eliminates the mixing of an air stream in a turbulent flow and, therefore, ensures stable pressure of compressed air flowing out of all working chambers along the entire length of the shock-air wave front along the length wells, while the presence of a control device in this design allows for repeated cycles of operation without removing the device from the well .
Figure 3 shows the basic device for combined softening of a coal seam with one pneumatic packer (sealant) installed in the well, figure 4 is a schematic diagram of the operation of the basic device for combined softening of a coal seam, figure 5 shows a modification of the basic device for combined softening coal seam using air duct pipe elements between sections (modules) of the stavas of a multi-section pneumo-impulse cartridge, Fig.6 is a schematic diagram of a modif ikation of the base device using a multi-section pneumopulse cartridge of intermediate air pipe elements in the stavka, Fig.7 shows a modification of the base device for softening a coal seam with two pneumatic packers installed in the well, Fig.8 is a schematic diagram of a modification of the base device with two pneumatic packers, Fig.9 - modification of the basic device for softening a coal seam with two pneumatic packers interconnected by an air duct installed in wells e, figure 10 is a schematic diagram of a modification of a basic device with two pneumatic packers interconnected by an air duct.
The device shown in Fig. 3 contains a pneumatic packer (sealant) 1 and a multi-section pneumatic impulse cartridge 2. Moreover, a pneumatic sealant of any design can be used as a pneumatic packer, which allows two channels 3 and 4 to be arranged in its design. One channel 3 is intended for injection into the well 5 under the pressure of carbon dioxide, and then through the same channel injection into the well 5 under the pressure of water. Another channel 4 is designed to supply compressed air to the working cavity of the pneumatic packer 1 and to the multi-section pneumatic impulse cartridge 2, as well as to discharge compressed air from the working cavity of the pneumatic packer 1. The device is connected to two lines of reinforced high-pressure hoses 6 and 7. One line 6 s shut-off valve 8 is used for injection into the well 5 through the pneumatic packer 1 through the channel 3 of carbon dioxide, and then through the same water line. The second, air line 7, connected to a source of high pressure compressed air through a three-way control valve 9, is used to supply compressed air to the pneumatic packer 1 and to the multi-section pneumatic pulse cartridge 2 of the device, as well as to discharge compressed air from the working cavity of the pneumatic packer 1.
The pneumatic packer 1 included in the device for combined softening of the coal seam and located in the rear part of the base device contains a system of supply channels 3 and 4 for injection into the well 5 under pressure of carbon dioxide, water and separate supply of compressed air to the pneumatic packer 1 and to the multi-section pneumatic pulse cartridge 2, as well as to discharge compressed air from the working cavity of the pneumatic packer 1, respectively. The pneumatic packer 1 contains a reducer 10 and a safety valve 27, which allow compressed air to be supplied through the channel 4 to the working cavity of the pneumatic packer 1 at a given working pressure and to control the upper limit of the working pressure of compressed air using the safety valve 27 in the working cavity of the pneumatic packer 1, and also the nozzle - calibrated channel 32 connecting the working cavity of the pneumatic packer 1 with the inlet channel 4, for discharge of compressed air from the working cavity.
A multi-section pneumo-impulse cartridge 2 (Fig. 3 and Fig. 4A), included in a device for combined softening of a coal seam, consists of a control device 11 and a stand, composed of a given number of series-connected sections (modules) 12. In each section (module) 12 for compressed air, a working chamber 13 with a capacity of V 1 and a discharge chamber 14 with a capacity of V 2 are formed . Each section (module) 12 has exhaust holes 15 that are blocked by differential spools 16, which abut against the thrust ring 17 due to the force of the spring 18. The area of the left end of the differential spool 16 is larger than the area of its right end (the area of the right end of the differential spool 16 is taken to be formed behind the contour of the fit of the right end of the differential spool 16 to the thrust ring 17). Each differential spool 16 is equipped with a check valve 19.
Since the direction of flow of compressed air from the working and discharge chambers 13 and 14 affects the nature of cracks in the processed coal mass, the exhaust holes 15 can be made at different angles in the range of 45-135 degrees in the direction relative to the longitudinal axis of the device. This makes it possible to change the direction of discharge of pulses of compressed air from the exhaust openings 15 into the well during the assembly of the multi-section pneumatic impulse cartridge 2 stavka (see FIG. 4B), that is, sections (modules) 12 of the pneumatic pulse cartridge 2 stav can be installed along the length of the stav so that it is possible to form flows in a pulsed mode of compressed air from the exhaust holes 15 of the normal, oncoming and opposite directions (Fig. 4B shows the tail and head sections 12 of the air pulse th cartridge 2 forming the compressed air flows from the exhaust openings 15 opposite direction). The stavo length of the pneumatic pulse cartridge 2 can be changed due to the number of sections (modules) 12 included in this stav. Moreover, by combining sections (modules) 12 with exhaust openings 15 of various directions along the length of the air-pulse cartridge 2, it is possible to change the nature of the occurrence of cracks during softening of the coal seam.
The control device 11 (see figa), located in the rear of the pneumatic pulse cartridge 2, operates and consists of an annular piston 20 adjacent to the thrust ring 21 and overlapping holes 22, which discharge compressed air from the discharge chamber 14 of the tail section ( module) 12 stavki air-pulse cartridge 2 into the well (see figb). An annular piston 20 is mounted on the air distributor 23 (see FIG. 4A). The annular piston 20 and the air distributor 23 are placed in the control device 11 coaxially and form in it an auxiliary annular chamber 24 with a capacity of V 3 . At the same time, the capacity of the auxiliary annular chamber 24 of the control device 11 and the working and auxiliary chambers 13 and 14 of the sections (modules) 12 of the head of the pneumatic cartridge 2 must satisfy the condition V 1 > V 2 > V 3 .
In the casing of the air distributor 23, a central longitudinal channel 25 and a check valve 19 are located, which communicate with the cavity of the discharge chamber 14 of the tail section (tail module) 12 of the air pulse cartridge 2 with the transverse discharge channel 26, with an annular auxiliary chamber 24, with a supply channel 4 located in the pneumatic packer 1, and with an air duct of compressed air 7. The area of the left end of the annular piston 20 is larger than the area of its right end (the area of the right end of the annular piston 20 is taken ƈ This fit the contour of the right end of the annular piston 20 to the thrust ring 21).
A device for combined softening of a coal seam with one pneumatic packer (sealant) works as follows. From a source of high-pressure compressed air through an open control three-way valve 9 and an air supply network 7, compressed air enters (see Fig. 4A) into the air pack 1 and through the channel 4, which is located in the air pack 1, is divided into two streams. One stream of compressed air through the gearbox 10 enters the working cavity of the pneumatic packer 1, which at the same time seals the well. The reducer 10 limits the increase in the pressure of compressed air in the working cavity of the pneumatic packer 1 not higher than the maximum working pressure, and the safety valve 27 controls the working pressure in the working cavity of the pneumatic packer 1. The second stream of compressed air enters the control device 11 and then into the discharge chamber 14 of the tail section (module ) 12 stav of pneumatic impulse cartridge 2. Next, the flow of compressed air through all the check valves 17 enters all the discharge and working chambers of sections (modules) 12 stav of pneumatic impulse cartridge 2, in which In this case, the equilibrium set pressure of compressed air is established. Then, the control three-way valve 9 is turned to the closed position. After that, they begin the process of softening the coal mass. Open valve 8 and from the source through line 6 and channel 3 located in the pneumatic packer 1, produce under pressure the flow of carbon dioxide into the well. Then, after treating the coal mass around the well with carbon dioxide, water is supplied under pressure to the well through the same communication system as when carbon dioxide was supplied to the well, until the carbon mass softened by carbon dioxide in the treated zone is fully saturated. Close valve 8. After this, the three-way control valve 9 is turned to the "reset" position (see Fig. 4B), and through the three-way control valve 9, compressed air flows (is discharged) from the tank of the auxiliary annular chamber 24 of the control device 11 into the atmosphere.
As a result of this, a pressure differential occurs between the ends of the cylindrical piston 20, which instantly shifts to the left and opens the discharge holes 22, through which compressed air from the discharge chamber of the tail section (module) 12 of the air-pulse cartridge 2 is discharged into the well. In connection with the instantaneous pressure drop in the discharge chamber of the tail section (module) 12, a differential pressure of compressed air is created between the discharge chamber 14 and the working chamber 13 of this section of the pneumatic impulse cartridge 2. The differential valve 16 moves to the left at high speed (see Fig. 4B) By pressing spring 18 to the left extreme position, the exhaust openings 15 of the tail section (module) 12 and air from the working chamber 13 and the discharge chamber 14 of the next section after the tail are discharged into the well. In a similar way, the remaining sections 12 of the air-pulse cartridge 2 are activated sequentially.
After the pneumatic pulse cartridge 2 is fully actuated (depleted), the differential spools 16 under the action of the force of the springs 18 return to their original position, after which the duty cycle of the impact on the treated coal seam is repeated in pulse mode with high-pressure compressed air. That is, the control three-way valve 9 is opened and the high-pressure compressed air from the source enters the control device 11 and then into all the discharge and working chambers of the sections (modules) 12 of the air pulse cartridge 2. Then the control three-way valve 9 is turned to the “reset” position and occurs the process described above in figure 4, the operation of the pneumatic pulse cartridge 2. After completion of the processing of the coal seam around the well 5 using the proposed device, the well 5 is depressurized (sb compressed air pressure is sucked in the working cavity of the pneumatic packer 1), that is, through the nozzle — a calibrated channel 32 connecting the working cavity of the pneumatic packer 1 with the supply channel 4, with the open control three-way valve 9, compressed air from the working cavity of the pneumatic packer 1 through the supply channel and the air supply network 7 expires in the atmosphere. Then the device is rearranged to another well for processing operations of the coal mass at the next position.
The modification of the basic device depicted in FIG. 5 for a combined softening of a coal seam using air pipe elements 28 between sections (modules) 12 of the air pulse cartridge 2, and in FIG. 6 a schematic diagram of this device. This modification of the base device allows you to disperse sections (modules) 12 of the sting of the pneumatic pulse cartridge 2 along the length of the well 5 (see figure 5), which allows depending on the physicomechanical properties and structure of the coal mass to change the nature of the formation of cracks when exposed to the treated section of coal array in pulse mode with high pressure compressed air. This is achieved by increasing the exposure time to the treated area of the coal mass in a pulsed mode with high-pressure compressed air due to the additional volume of compressed air V 4 located in the intermediate air pipe elements 28 flowing from the exhaust holes 15. This modification of the basic device is prepared for operation and functioning by analogy with the basic device described above and shown in Fig.4.
The modification of the basic device shown in Fig. 7 is intended to implement the method of softening the coal mass shown in Fig. 2 when the length of the wells is more than 20 m. In this modification (see Fig. 7 and Fig. 8) two pneumatic packers 1 and 29 are used As in the basic device, the pneumatic packer 1 is also installed in the rear part of the modified device and has the same pneumatic packer design as in the basic version (see Fig. 4). The head pneumatic packer 29 is installed in the head of the entire device. Filling with compressed air the working cavity of the head pneumatic packer 29 is carried out directly from the working chamber 13 of the head section (module) 12 of the air pulse cartridge 2 through the air duct 30 connecting these cavities. The working chamber of the head pneumatic packer 29 is connected to the air duct 30 through the gearbox 10 and the safety valve 27. The gearbox 10 passes compressed air under pressure not exceeding the specified working pressure in the working chamber of the pneumatic packer 29, and the safety valve 27 controls the upper limit of the working pressure of the compressed air in the working the cavity of the pneumatic packer 29. The nozzle is a calibrated channel 32 of the pneumatic packer 29, connecting the working cavity of the pneumatic packer 29 with the working cavity 13, is used to discharge compressed air from the working the pneumatic packer 29 into the working chamber 13 of the head section (module) 12 of the pneumatic impulse cartridge 2. The nozzle is a calibrated channel 32 of the pneumatic packer 1 connecting the working chamber of the pneumatic packer 1 with the supply channel 4, with the open control three-way valve 9, used to discharge compressed air from the working the cavity of the pneumatic packer 1 through the inlet channel 4 and the air duct network 7 into the atmosphere. Preparation for operation and the operation of this modification is carried out by analogy with the device described and depicted in figure 4. In this case, the well along the length by which the coal mass is processed is sealed at each run on both sides.
The device shown in Fig.9 and Fig.10 is a modification of the device for softening the coal seam depicted in Fig.7 and Fig.8. This device differs from the device shown in Fig. 7 and Fig. 8 in that the head pneumatic packer 29 is filled with compressed air through an air duct (high pressure flexible air duct) 31 connecting the working cavity of the tail pneumatic packer 1 to the working cavity of the head pneumatic packer 29. In this modification, the head pneumatic packer 29 does not have a reducer 10 in comparison with pneumatic packer 1, a safety valve 27, and a nozzle have a calibrated channel 32. Since the working capacities of these pneumatic packers 1 and 29 are united Then controlling and maintaining a predetermined operating pressure in the working spaces pnevmopakerov 1 and 29, and compressed working air discharge of cavities carried pnevmopakerov devices available to the caudal pnevmopakera 1 (reducer 10, a safety valve 27 and the jet - the calibrated channel 32). Preparation for operation and the operation of this modification is carried out by analogy with the devices described and shown in Fig. 4, Fig. 7 and Fig. 8.
Thus, the use of the proposed combined methods of softening the coal mass and devices for their implementation will increase the efficiency of softening the coal mass and degassing of the coal seam in a selective mode, depending on the physicomechanical properties of coal (coal seam structure) and mining conditions.
Information sources
1. "Method of softening the coal mass", patent for the invention of the Russian Federation No. 2053369, class E21F 5/00, 01/27/1996, Bull. No. 3 (analogue of the method).
2. "Method for softening a coal seam (options)", patent for the invention of the Russian Federation No. 2082886, class. E21F 5/00, June 27, 1997, Bull. No. 18 (prototype method).
3. "Pneumatic cartridge", copyright certificate for the invention of the USSR No. 1802117, class. Е21С 37/06, 03/15/1993, Bull. No. 10 (analog of the device).
4. "Gas-dynamic cartridge", copyright certificate for the invention of the USSR No. 1809049, class. Е21С 37/06, 04/15/1993, Bull. No. 14 (prototype device).

Claims (5)

1. A method of softening a coal mass, including drilling wells into the treated zone of a coal seam, supplying carbon dioxide to them at a pressure not lower than the threshold pressure, injecting water under pressure below the hydraulic fracture to completely saturate the treated zone, characterized in that high pressure compressed air is supplied for increasing the pressure in the well above the fracturing of the coal seam in the treated zone, and high-pressure compressed air is supplied in a pulsed mode both separately and simultaneously in any room binations and in a certain pressure range of compressed air with a given frequency depending on the physicomechanical properties and structure of the coal seam.
2. A device for softening a coal seam, including a multi-section pneumatic impulse cartridge, characterized in that the design of the device includes one pneumatic packer having a gearbox, a safety valve, a nozzle — a calibrated channel and two channels, one of which is designed to inject carbon dioxide into the well under pressure and then through the same injection channel into the well under water pressure, another is designed to supply compressed air to the working cavity of the pneumatic packer and to the multi-section pneumatic impulse cartridge as well as to discharge compressed air from the working cavity of the pneumatic packer, while the pneumatic packer is located in the rear part of the device, and the multi-section pneumatic impulse cartridge consists of a control device with an auxiliary annular chamber with a capacity of V 3 and a stand composed of a given number of series-connected sections in the form of modules with exhaust openings covered by differential spools, and the area of the left end of the spools is greater than the area of their right end, and each section contains a working chamber awn V 1 and the discharge chamber capacity V 2, wherein the capacitance of the auxiliary annular chamber of the control device and container working and auxiliary chambers sections stava multisection pnevmoimpulsnogo cartridge must satisfy V 1> V 2> V 3, and the exhaust holes are formed at an angle of 45 ÷ 135 ° degrees in the direction relative to the longitudinal axis of the device.
3. The device according to claim 2, characterized in that between the sections of the stavka of a multi-section pneumo-impulse cartridge are air pipe elements.
4. The device according to claim 2, characterized in that it contains an additional pneumatic packer, while the pneumatic packers are placed at the ends of the multi-section pneumopulse cartridge.
5. The device according to claim 4, characterized in that it contains an air duct made in the form of a flexible high pressure air duct sleeve to fill the head pneumatic packer with compressed air, while the air duct connects the working cavity of the tail pneumatic packer with the working cavity of the head pneumatic packer.
RU2007124009/03A 2007-06-27 2007-06-27 Combined method of loosening coal massif and facility for implementation of this method RU2342531C1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230394A (en) * 2011-05-24 2011-11-02 中国矿业大学 Secondary hole sealing system for improving coal bed gas extraction concentration
CN101598030B (en) * 2009-07-14 2012-02-01 中国矿业大学 Method for realizing fast coal exposing of coal seam rock cross with outburst danger
RU2468204C1 (en) * 2011-03-22 2012-11-27 ЗАО "Межведомственная комиссия по взрывному делу" при Академии горных наук (ЗАО "МВК по ВД при АГН") Combined air-impact device
CN102913274A (en) * 2012-11-07 2013-02-06 中国矿业大学 System for increasing yield of gas excavation borehole and method thereof
RU2480589C2 (en) * 2011-07-07 2013-04-27 Учреждение Российской академии наук Институт горного дела Сибирского отделения РАН Method for degassing of coal bed
RU2547873C1 (en) * 2013-12-10 2015-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный минерально-сырьевой университет "Горный" Method of stimulation of coal bed through wells drilled from excavations
RU2588095C2 (en) * 2012-10-17 2016-06-27 Чайна Юниверсити Оф Майнинг Энд Текнолоджи Pneumatic pressure release of high pressure explosion and method of boosting transmission
RU2634597C1 (en) * 2016-07-15 2017-11-01 Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) Method for developing mine workings and conducting stoping operations
RU2704997C1 (en) * 2018-04-28 2019-11-05 Китайский Университет Горного Дела И Технологии Method and device for control of coal bed upper part collapse area due to application of technology of pulsed hydraulic fracturing of a formation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101598030B (en) * 2009-07-14 2012-02-01 中国矿业大学 Method for realizing fast coal exposing of coal seam rock cross with outburst danger
RU2468204C1 (en) * 2011-03-22 2012-11-27 ЗАО "Межведомственная комиссия по взрывному делу" при Академии горных наук (ЗАО "МВК по ВД при АГН") Combined air-impact device
CN102230394A (en) * 2011-05-24 2011-11-02 中国矿业大学 Secondary hole sealing system for improving coal bed gas extraction concentration
CN102230394B (en) * 2011-05-24 2013-02-13 中国矿业大学 Secondary hole sealing system for improving coal bed gas extraction concentration
RU2480589C2 (en) * 2011-07-07 2013-04-27 Учреждение Российской академии наук Институт горного дела Сибирского отделения РАН Method for degassing of coal bed
RU2588095C2 (en) * 2012-10-17 2016-06-27 Чайна Юниверсити Оф Майнинг Энд Текнолоджи Pneumatic pressure release of high pressure explosion and method of boosting transmission
CN102913274A (en) * 2012-11-07 2013-02-06 中国矿业大学 System for increasing yield of gas excavation borehole and method thereof
CN102913274B (en) * 2012-11-07 2015-03-04 中国矿业大学 System for increasing yield of gas excavation borehole and method thereof
RU2547873C1 (en) * 2013-12-10 2015-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный минерально-сырьевой университет "Горный" Method of stimulation of coal bed through wells drilled from excavations
RU2634597C1 (en) * 2016-07-15 2017-11-01 Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) Method for developing mine workings and conducting stoping operations
RU2704997C1 (en) * 2018-04-28 2019-11-05 Китайский Университет Горного Дела И Технологии Method and device for control of coal bed upper part collapse area due to application of technology of pulsed hydraulic fracturing of a formation

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