CN116025408A - Ground long-drilling multistage water seal loosening blasting fracturing device and method - Google Patents
Ground long-drilling multistage water seal loosening blasting fracturing device and method Download PDFInfo
- Publication number
- CN116025408A CN116025408A CN202211633745.2A CN202211633745A CN116025408A CN 116025408 A CN116025408 A CN 116025408A CN 202211633745 A CN202211633745 A CN 202211633745A CN 116025408 A CN116025408 A CN 116025408A
- Authority
- CN
- China
- Prior art keywords
- blasting
- section
- drilling
- shaped long
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a ground long-drilling multistage water seal loosening blasting fracturing method, and belongs to the field of ground long-drilling deep hole blasting. The method comprises the steps of setting an L-shaped long drilling hole in a coal seam, performing water sealing, injecting a reducing agent into the drilling hole, oxidizing and igniting to detonate; the pressure of the oxidant and the reducing agent in the long drilling holes is continuously increased by utilizing the long drilling holes, multistage blasting is realized in the long drilling holes, a larger pressure relief range is formed, damages are formed in the coal body through blasting impact, cracks are developed, the cracks are continuously extended through multiple blasting, so that a seepage channel is provided for gas existing in the coal body, and the gas permeability of the coal body is increased, so that gas extraction is facilitated; meanwhile, the water sealing section is constructed in the turning section of the long drilling hole, so that the impact effect of blasting on a coal body is increased in the explosion process, and the damage of blasting on a shaft sleeve is reduced due to the energy absorption effect of the water sealing section, the shaft is kept intact, the follow-up extraction is facilitated, and the beneficial effect of loosening blasting is obviously enhanced.
Description
Technical Field
The invention belongs to the field of ground long-drilling deep hole blasting, and particularly relates to a ground long-drilling multistage water seal loosening blasting fracturing device and method.
Background
The traditional method is used for implementing the ground long-drilling coal seam loosening blasting, the problems of difficult medicine feeding and poor controllability exist due to long distance, the ground long-drilling deep hole loosening pressure relief blasting is a single-stage blasting mode, the explosive is generally solid explosive, and after the explosive is filled once, continuous blasting cannot be carried out twice or more times in the same hole; the blast shock wave has a certain destructive effect on the well bore, and these problems prevent the application of loose blasting in long-hole drilling.
The prior art also uses explosive gas as explosive substances to overcome the problem of difficult charging, but the exploders or the chain exploders are required to be installed at a plurality of positions in the drilling holes to explode the coal seam in the drilling hole area, and meanwhile, the exploders can only be used once, so that the exploding can only be carried out once in one area, and the explosion effect is limited.
Disclosure of Invention
Aiming at the technical defects, the invention provides a ground long-drilling multistage water seal loosening blasting fracturing device and method, which are applied to coal mine pressure relief and permeability improvement, can realize multistage blasting, form cracks in the coal body through blasting, enrich cracks of the coal body around the drilling hole, extend the cracks farther, overcome the problem of poor primary blasting effect, provide a channel for gas existing in the coal body, increase the gas permeability of the coal body, facilitate gas extraction, solve the problem of ground long-drilling loosening blasting, and remarkably improve the blasting pressure relief and permeability improvement effect.
In order to solve the technical problems, the ground long-drilling multistage water seal loosening blasting fracturing device comprises an L-shaped long drilling hole which is formed in a rock stratum towards a coal seam, wherein the L-shaped long drilling hole comprises a vertical section penetrating through the rock stratum until the vertical section is close to a bottom plate of the coal seam, an arc transition inclined turning section forming an arc angle smaller than 90 DEG at the coal seam and a horizontal section which is directed to a roof of the coal seam for drilling, the horizontal section drilling distance is not smaller than 50m, the coal seam is covered as much as possible, and a water sealing section for accumulating water is formed in the inclined turning section and a part of the horizontal section through the angle matching of the inclined turning section and the horizontal section; the water sealing section is utilized to absorb explosion shock waves transmitted from the front in the explosion process, so that damage to the L-shaped long-drilled vertical section shaft is reduced;
an ignition extraction pipeline system is arranged in the L-shaped long drilling hole, the ignition extraction pipeline system comprises a fire pipe arranged in the L-shaped long drilling hole to the bottom of the hole and an extraction sleeve with the end part positioned at the water sealing section of the inclined turning section, and the end part of the extraction sleeve is provided with a screen pipe tail part connected with a mixing pipe and an oil pumping unit which are arranged on the ground surface; the fire tube comprises two air tubes and a cable, wherein the air tubes are respectively used for conveying an oxidant and a reducing agent, the end parts of the fire tube are connected with an ignition head, a mixing chamber which is connected with the end parts of the two air tubes and is used for mixing the oxidant and the reducing agent is arranged in the ignition head, a temperature probe and an ignition needle which are connected with the cable are also arranged at the mixing chamber, the other end of the cable is connected with an igniter which is arranged on the ground surface, and the igniter is used for controlling the ignition needle to realize remote ignition; the outer sides of the fire tubes are wrapped with heat insulation sleeves; a combustion air source and a pumping pump are arranged on the ground surface at the hole of the L-shaped long drill hole, wherein the combustion air source comprises two air cylinders for filling an oxidant and a reducing agent respectively, the outlet of each air cylinder is connected with the tail end of one air pipe through a backfire preventer respectively, and a first valve, a flowmeter, a quick connector and a second valve are sequentially arranged on the air pipe connected with the oxidant; the gas cylinder connected with the reducing agent is sequentially provided with a valve and a flowmeter.
Further, a tee joint switched by a switch is connected with the two air pipes between the combustion air source and the extraction pump; or the interfaces of the combustion air source and the extraction pump are respectively provided with a quick-disassembly and quick-assembly structure, so that the quick-disassembly and quick-assembly structure is convenient to realize switching with two air pipes.
A fracturing method of a ground long-drilling multistage water seal loosening blasting fracturing device comprises the following steps:
s1, a vertical section of an L-shaped long drilling hole is formed from the ground and enters a coal seam bottom plate, then an inclined turning section is constructed to realize gradual drilling close to a top plate to form a horizontal section of an inclined upward structure after turning, and a sealing section is arranged on the vertical section; carrying out ground ignition test and airtightness test on a fire pipe, after smooth ignition and no air leakage of a pipeline are ensured, conveying the fire pipe into an L-shaped long drilling hole until the end part is close to the bottom of a horizontal section hole, then installing a extraction sleeve at the vertical section, installing a screen pipe at the front end of the extraction sleeve, placing the extraction sleeve at the lowest position of a drilling hole inclined turning section, and if no water is accumulated in the L-shaped long drilling hole or the water sealing section formed by the water accumulation in the L-shaped long drilling hole is smaller than the diameter of the L-shaped long drilling hole, injecting water into the L-shaped long drilling hole until the water level depth is higher than the diameter of the L-shaped long drilling hole to form a water sealing section, and sealing the extraction sleeve and the part of the fire pipe in a rock stratum after the arrangement is finished to form a sealing section; the upper end of the extraction sleeve is connected with the pumping unit and the mixing pipe, so as to prepare for the extraction after the loose blasting;
s2, closing valves on the two gas cylinders, respectively filling an oxidant and a reducing agent into the two gas cylinders according to a complete combustion proportion, and testing the air tightness of the system after filling; after the mixture is qualified, opening all valves on two gas cylinder pipelines, simultaneously opening valves on a mixing pipe, injecting an oxidant and a reducing agent into the L-shaped long drilling hole through a fire pipe to set pressure (preferably, the pressure is 0.1MPa, and the pressure is increased by 0.5MPa on the basis of the previous explosion each time), and then closing all valves on the two gas cylinder pipelines and the mixing pipe;
s3, starting an igniter to perform ignition explosion on the oxidant and the reducing agent injected into the L-shaped long drilling hole, judging whether the igniter is successfully ignited or not by utilizing data of a temperature probe, maintaining ignition until successful explosion so as to increase the air permeability of a coal bed, and performing explosion from the bottom of the hole to a water sealing section after explosion, wherein the water sealing section effectively absorbs explosion energy in the explosion process, so that the explosion effect of a front coal body is prevented from being influenced, and the explosion impact of a vertical section shaft is effectively protected;
s4, after the explosion is successful, the quick connector is disconnected to remove the original connected gas cylinder and replace the gas cylinder with a pumping pump, gas generated after the explosion of the L-shaped long drilling horizontal section in the coal seam is pumped, at the moment, the gas in the vertical section and the inclined turning section is reduced to be pumped away under the water sealing effect of the water sealing section, the gas mixture after the explosion in front of the horizontal drilling can be timely and effectively pumped away until the gas concentration in the gas reaches more than 60%, and the pumping is stopped, so that the primary explosion is completed;
s5, repeating the steps S2 to S4, and performing blasting for a plurality of times until the blasting peak value in the coal bed reaches the compressive strength of the top plate and the bottom plate;
and S6, after blasting is completed, closing valves on the two air pipes, opening the valve on the mixing pipe, and starting the pumping unit to perform coal bed gas drainage.
Further, the water seal section effectively seals along the direction of the horizontal section of the L-shaped long drilling hole, the water depth is higher than the diameter of the through hole, and the length exceeds 2 meters.
Further, the igniter continuously monitors and displays the temperature in the borehole through the temperature probe in addition to ignition through the ignition needle.
Further, when the gas concentration in the L-shaped long drill hole exceeds 50%, only the oxidant can be selectively injected, and the explosion can be performed by utilizing the reaction of the gas and the oxidant.
Further, in step S2, after 2 blasts, before injecting the oxidizing agent and the reducing agent, the valve on the mixing pipe is closed to seal the wellhead, and the pressure injected into the L-shaped long borehole is increased, so that the L-shaped long borehole has more oxidizing agent and reducing agent mixture and higher pressure, thereby improving the blasting pressure and improving the blasting effect.
The invention has the beneficial effects that: the method is applied to the pressure relief and permeability improvement of the coal mine, and can realize multistage blasting in the same long drill hole on the ground until a preset pressure relief state is reached, so that the pressure relief effect is more reliable than that of the traditional loose blasting, and the formed effective pressure relief range is larger; the method uses gas as an explosive material, overcomes the problem of difficult drug delivery of a long-bore hole of a solid explosive, and simultaneously can utilize gas released by a coal seam to participate in blasting, so that the consumption of a reducing agent is reduced; the method utilizes water to seal, explosion shock waves are transmitted into the water from the gas, part of energy is absorbed, the water is transmitted into the gas again, finally, the shaft is impacted, the energy is weakened, the shaft is protected, the damage of explosion to the shaft is reduced, the coal is directly acted in the coal seam, the damage to the shaft is weakened, the damage to the coal is not reduced, and the subsequent exploitation of coal bed gas (gas) is facilitated. Cracks are formed in the coal body through explosion, so that a channel is provided for gas existing in the coal body, and the gas permeability of the coal body is increased, so that gas extraction is facilitated. The invention has no problem of dead cannon, and hidden danger is not left on site, and the internal oxidant and the reducing agent are convenient to dilute to the concentration smaller than the lower limit of combustion by air and timely pump away. The whole scheme does not need underground manual intervention, can finish all operations and implementations through the ground surface remote, is safe and reliable, has high degree of automation, and has wide practical value.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of connection of each device in a ground long-drilling multistage water seal loosening blasting fracturing method provided by an embodiment of the invention;
fig. 2 is a schematic diagram of an internal structure of an ignition head according to an embodiment of the present invention.
Reference numerals illustrate:
1. a gas cylinder; 2. a flashback preventer; 4. a valve; 5. a flow meter; 3. an air pipe; 6. a quick connector; 7. an igniter; 8. a cable; 9. a mixing tube; 10. pumping unit; 11. a pump; 12. a sealing section; 13. extracting the sleeve; 14. a fire tube; 15. igniting the head; 15-1, a temperature probe; 15-2, ignition needle; 15-3, mixing chamber; 16. a heat insulating sleeve; 17. l-shaped long drilling holes; 18. a water seal section; 19. a screen pipe; 20. a rock formation; 21. and (3) a coal seam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention:
as shown in FIG. 1, the ground long-drilling multistage water seal loosening blasting fracturing device comprises an L-shaped long drill hole 17 constructed from a rock stratum 20 to a coal seam 21, wherein the L-shaped long drill hole 17 comprises a vertical section penetrating through the rock stratum 20 until the ground layer is close to the bottom plate of the coal seam 21, an inclined turning section forming a curve of more than 270 DEG and a horizontal section drilling towards the top plate of the coal seam 21, the horizontal section drilling distance is not less than 50m, the coal seam 21 is covered as much as possible, and a water sealing section 18 for accumulating water is formed in the inclined turning section and part of the horizontal section through the angle matching of the inclined turning section and the horizontal section; the water sealing section 18 is utilized to absorb explosion shock waves transmitted from the front in the explosion process, so that damage to the vertical section shaft of the L-shaped long drilling hole 17 is reduced;
an ignition extraction pipeline system is arranged in the L-shaped long drilling hole 17, the ignition extraction pipeline system comprises a fire pipe 14 arranged in the L-shaped long drilling hole 17 to the bottom of the hole, and an extraction sleeve 13 with the end part positioned at the position of a water sealing section 18 of the inclined turning section, and the tail part of the end part of the extraction sleeve 13 is provided with a screen pipe 19, and is connected with a mixing pipe 9 and an oil pumping unit 10 which are arranged on the ground surface; the fire tube 14 comprises two air pipes 3 and a cable 8 which are respectively used for conveying an oxidant and a reducing agent, the end part of the fire tube 14 is connected with an ignition head 15, as shown in figure 2, a mixing chamber 15-3 which is connected with the end parts of the two air pipes 3 and mixes the oxidant and the reducing agent is arranged in the ignition head 15, a temperature probe 15-1 and an ignition needle 15-2 which are connected with the cable 8 are also arranged at the mixing chamber 15-3, the other end of the cable 8 is connected with an igniter 7 which is arranged on the ground surface, the ignition needle 15-2 is controlled by the igniter 7 to realize remote ignition, and the temperature probe 15-1 is used for detecting the combustion temperature and the igniter 7 are used for monitoring; the outside of the fire tube 14 is wrapped with a heat insulation sleeve 16; a combustion air source and a pumping pump 11 are arranged on the ground surface at the drill hole of the L-shaped long drill hole 17, wherein the combustion air source comprises two air cylinders 1 respectively used for filling an oxidant and a reducing agent, the outlet of each air cylinder 1 is respectively connected with the tail end of one air pipe 3 through a backfire preventer 2, and a first valve 4, a flowmeter 5, a quick connector 6 and a second valve are sequentially arranged on the air pipe 3 connected with the oxidant; the gas cylinder 1 connected with the reducing agent is sequentially provided with a valve and a flowmeter 5.
Wherein, the combustion air source and the extraction pump 11 are connected with the two air pipes 3 through a tee joint switched by a switch; or the interfaces of the combustion air source and the extraction pump 11 are respectively provided with a quick-dismantling and quick-assembling structure, so that the quick-dismantling and quick-assembling structure is convenient to realize switching with the two air pipes 3.
A cracking method of a ground long-drilling multistage water seal loosening blasting cracking device comprises the following steps:
s1, a vertical section of an L-shaped long drilling hole 17 is formed from the ground and enters a bottom plate of a coal seam 21, then an inclined turning section is constructed to realize gradual drilling close to a top plate to form a horizontal section of an inclined upward structure after turning, and a sealing section 12 is arranged on the vertical section; carrying out ground ignition test and tightness test on the fire tube 14, after smooth ignition and no air leakage of a pipeline are ensured, conveying the fire tube 14 into the L-shaped long drilling hole 17 until the end part is close to the bottom of a horizontal section hole, then installing a extraction sleeve 13 at the vertical section, installing a screen pipe 19 at the front end of the extraction sleeve 13, placing the extraction sleeve 13 at the lowest position of the vertical section of the drilling hole, and if no water exists in the L-shaped long drilling hole 17 or the water sealing section 18 formed by the water accumulation in the L-shaped long drilling hole 17 is smaller than the diameter of the L-shaped long drilling hole 17, injecting water into the L-shaped long drilling hole 17 until the water level depth is higher than the diameter of the L-shaped long drilling hole 17 to form a sealing section 18, and sealing the extraction sleeve 13 and the part of the fire tube 14 in a rock stratum 20 after the arrangement is finished to form a sealing section 12; the upper end of the extraction sleeve 13 is connected with the pumping unit 10 and the mixing pipe 9, so as to prepare for the discharge and the extraction after the loose blasting; the water seal section 18 is used for effectively sealing along the horizontal section direction of the L-shaped long drilling hole 17, and the water depth is higher than the diameter of the through hole and the length is more than 2 meters.
S2, closing valves on the two gas cylinders 1, respectively filling an oxidant and a reducing agent into the two gas cylinders 1 according to a complete combustion proportion, and testing the air tightness of the system after filling; after the two gas cylinders 1 are qualified, all valves on the pipelines are opened, the valves on the mixing pipe 9 are opened at the same time, the oxidant and the reducing agent are injected into the L-shaped long drilling holes 17 through the fire pipe 14 to set pressure, preferably, the pressure is 0.1MPa, the pressure is increased by 0.5MPa on the basis of the previous time after each explosion, and all the valves on the pipelines of the two gas cylinders 1 and the mixing pipe 9 are closed; after 2 times of blasting, before the oxidant and the reducing agent are injected, a valve on the mixing pipe 9 is closed to seal a wellhead, and the pressure injected into the L-shaped long drill hole 17 is increased, so that more oxidant-reducing agent mixture and higher pressure exist in the L-shaped long drill hole 17, the blasting pressure is increased, and the blasting effect is improved.
S3, starting the igniter 7 to perform ignition explosion on the oxidant and the reducing agent injected into the L-shaped long drilling hole 17, judging whether the igniter 7 is successfully ignited or not by utilizing the data of the temperature probe 15-1, and maintaining ignition until explosion to increase the air permeability of the coal seam, wherein the front coal body explosion effect is not affected due to the absorption energy effect of the water seal 18, and the explosion impact of the vertical section shaft is effectively protected.
S4, after the explosion is successful, the quick connector 6 is disconnected, the original connected gas cylinder 1 is replaced by the extraction pump 11, gas generated after the horizontal section of the L-shaped long drilling hole 17 is exploded in the coal seam 21 is extracted, at the moment, the gas in the vertical section and the inclined turning section is reduced by the water sealing effect of the water sealing section 18, the gas mixture after the explosion in front of the horizontal drilling hole can be timely and effectively extracted until the gas concentration in the gas reaches more than 60%, the extraction is stopped, and the primary explosion is completed;
s5, repeating the steps S2 to S4, and performing blasting for a plurality of times until the blasting peak value in the coal seam 21 reaches the compressive strength of the top plate and the bottom plate;
and S6, after blasting is completed, closing valves on the two air pipes 3, opening a valve on the mixing pipe 9, and starting the pumping unit 10 to perform coal bed gas drainage.
The ground long-drilling multistage water seal loosening blasting fracturing method according to claim 3, wherein the ground long-drilling multistage water seal loosening blasting fracturing method is characterized in that; when the gas concentration in the L-shaped long drilled hole 17 exceeds 50%, only the oxidant can be selectively injected, and the explosion can be performed by utilizing the reaction of the gas and the oxidant.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. The utility model provides a multistage water seal of ground long drilling is not hard up to explode and is split device which characterized in that: the method comprises the steps of constructing an L-shaped long drilling hole (17) on a rock stratum (20) towards a coal seam (21), wherein the L-shaped long drilling hole (17) comprises a vertical section penetrating through the rock stratum (20) until the vertical section is close to a bottom plate of the coal seam (21), an arc transition inclined turning section forming an arc angle smaller than 90 DEG on the coal seam (21) and a horizontal section pointing to a top plate of the coal seam (21), the horizontal section drills a distance of not less than 50m and covers the coal seam (21) as much as possible, and a water sealing section (18) for accumulating water is formed on the inclined turning section and part of the horizontal section through angle matching of the inclined turning section and the horizontal section; the water sealing section (18) is used for absorbing explosion shock waves transmitted from the front in the explosion process, so that damage to the vertical section shaft of the L-shaped long drilling hole (17) is reduced;
an ignition extraction pipeline system is arranged in the L-shaped long drilling hole (17), the ignition extraction pipeline system comprises a fire pipe (14) arranged in the L-shaped long drilling hole (17) to the bottom of the hole, and an extraction sleeve (13) with the end part positioned at the water sealing section (18) of the inclined turning section, and the end part of the extraction sleeve (13) is provided with a screen pipe (19), and the tail part of the screen pipe is connected with a mixing pipe (9) and an oil pumping unit (10) which are arranged on the ground; the fire tube (14) comprises two air tubes (3) and a cable (8) which are respectively used for conveying an oxidant and a reducing agent, the end part of the fire tube (14) is connected with an ignition head (15), a mixing chamber (15-3) which is connected with the end parts of the two air tubes (3) and mixes the oxidant and the reducing agent is arranged in the ignition head (15), a temperature probe (15-1) and an ignition needle (15-2) which are connected with the cable (8) are also arranged at the mixing chamber (15-3), the other end of the cable (8) is connected with an igniter (7) which is arranged on the ground surface, and the ignition needle (15-2) is controlled by the igniter (7) to realize remote ignition; the outer sides of the fire tubes (14) are wrapped with heat insulation sleeves (16); a combustion air source and a pumping pump (11) are arranged at the drill hole of the L-shaped long drill hole (17) on the ground surface, wherein the combustion air source comprises two air cylinders (1) for filling an oxidant and a reducing agent respectively, the outlet of each air cylinder (1) is connected with the tail end of one air pipe (3) through a backfire preventer (2) respectively, and a first valve (4), a flowmeter (5), a quick connector (6) and a second valve are sequentially arranged on the air pipe (3) connected with the oxidant; the gas cylinder (1) connected with the reducing agent is sequentially provided with a valve and a flowmeter (5).
2. The ground long-drilling multistage water seal loosening blasting fracturing device according to claim 1, wherein: the combustion air source and the extraction pump (11) are connected with the two air pipes (3) through a tee joint switched by a switch; or the interfaces of the combustion air source and the extraction pump (11) are respectively provided with a quick-dismantling and quick-assembling structure, so that the quick-dismantling and quick-assembling structure is convenient to realize switching with the two air pipes (3).
3. A fracturing method using the ground long-drilling multistage water seal loosening blasting fracturing device according to claim 1, which is characterized by comprising the following steps:
s1, a vertical section of an L-shaped long drilling hole (17) is formed from the ground and enters a bottom plate of a coal seam (21), then an inclined turning section is constructed to realize gradual drilling close to a top plate to form a horizontal section of an inclined upward structure after turning, and a sealing section (12) is arranged on the vertical section; carrying out ground ignition test and air tightness test on a fire pipe (14), after smooth ignition and no air leakage of a pipeline are ensured, feeding the fire pipe (14) into an L-shaped long drilling hole (17) until the end part is close to the bottom of a horizontal section hole, then installing a extraction sleeve (13) on a vertical section, installing a screen pipe (19) at the front end of the extraction sleeve (13), placing the extraction sleeve (13) at the lowest position of a drilling inclined turning section, and sealing the extraction sleeve (13) and the part of the fire pipe (14) in a rock stratum (20) after the arrangement is finished to form a sealing section (12) if no water exists in the L-shaped long drilling hole (17) or the water sealing section (18) formed by the water in the L-shaped long drilling hole (17) is smaller than the diameter of the L-shaped long drilling hole (17); the upper end of the extraction sleeve (13) is connected with the pumping unit (10) and the mixing pipe (9), so as to prepare for the discharge and extraction after the loose blasting;
s2, closing valves on the two gas cylinders (1), respectively filling an oxidant and a reducing agent into the two gas cylinders (1) according to a complete combustion proportion, and testing the air tightness of the system after filling; after the mixture is qualified, opening all valves on the pipelines of the two gas cylinders (1), simultaneously opening valves on the mixing pipe (9), injecting an oxidant and a reducing agent into the L-shaped long drilling hole (17) through the fire pipe (14) to set pressure (preferably, the pressure is 0.1MPa, the pressure is increased by 0.5MPa on the basis of the previous time in the follow-up blasting), and then closing all valves on the pipelines of the two gas cylinders (1) and on the mixing pipe (9);
s3, starting an igniter (7) to perform ignition explosion on the oxidant and the reducing agent injected into the L-shaped long drilling hole (17), judging whether the igniter (7) is successfully ignited or not by utilizing data of a temperature probe (15-1), maintaining ignition until successful explosion so as to increase air permeability of a coal bed, and after explosion, blasting the hole bottom to a water sealing section (18), wherein the water sealing section (18) effectively absorbs explosion energy in the explosion process, thereby protecting the explosion effect of a front coal body from being influenced and effectively protecting the explosion impact of a vertical section shaft;
s4, after the explosion is successful, the quick connector (6) is disconnected, the original connected gas cylinder (1) is replaced by a pumping pump (11), gas generated after the horizontal section of the L-shaped long drill hole (17) is exploded in the coal seam (21) is pumped, at the moment, the gas in the vertical section and the inclined turning section is reduced to be pumped away by the water sealing effect of the water sealing section (18), and the mixed gas after the explosion in front of the horizontal drill hole can be timely and effectively pumped away until the gas concentration in the gas reaches more than 60%, and then the pumping is stopped, so that the primary explosion is completed;
s5, repeating the steps S2 to S4, and performing blasting for a plurality of times until the blasting peak value in the coal seam (21) reaches the compressive strength of the top plate and the bottom plate;
and S6, after blasting is completed, closing valves on the two air pipes (3), opening a valve on the mixing pipe (9), and starting the pumping unit (10) to perform coal bed gas drainage.
4. The ground long-drilling multistage water seal loosening blasting fracturing method according to claim 3, wherein the method comprises the following steps of: the water sealing section (18) is used for effectively sealing along the horizontal section direction of the L-shaped long drilling hole (17), and the water depth is higher than the diameter of the through hole and the length is more than 2 meters.
5. The ground long-drilling multistage water seal loosening blasting fracturing method is characterized by comprising the following steps of; the igniter (7) is used for continuously monitoring and displaying the temperature in the drill hole through the temperature probe (15-1) besides the ignition through the ignition needle (15-2).
6. The ground long-drilling multistage water seal loosening blasting fracturing method is characterized by comprising the following steps of; when the gas concentration in the L-shaped long drilling hole (17) exceeds 50%, only the oxidant can be injected, and the explosion can be performed by utilizing the reaction of the gas and the oxidant.
7. The ground long-drilling multistage water seal loosening blasting fracturing method is characterized by comprising the following steps of; in step S2, after 2 times of blasting, before the oxidant and the reducing agent are injected, a valve on the mixing pipe (9) is closed to seal a wellhead, and the pressure injected into the L-shaped long drill hole (17) is increased, so that more oxidant-reducing agent mixture and higher pressure exist in the L-shaped long drill hole (17), the blasting pressure is increased, and the blasting effect is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211633745.2A CN116025408A (en) | 2022-12-19 | 2022-12-19 | Ground long-drilling multistage water seal loosening blasting fracturing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211633745.2A CN116025408A (en) | 2022-12-19 | 2022-12-19 | Ground long-drilling multistage water seal loosening blasting fracturing device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116025408A true CN116025408A (en) | 2023-04-28 |
Family
ID=86076956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211633745.2A Pending CN116025408A (en) | 2022-12-19 | 2022-12-19 | Ground long-drilling multistage water seal loosening blasting fracturing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116025408A (en) |
-
2022
- 2022-12-19 CN CN202211633745.2A patent/CN116025408A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2731428C1 (en) | Method of gas production by alternate use of multi-stage cracking of coal massif during combustion with formation of shock wave and heat-carrier injection | |
| WO2022252591A1 (en) | Cracking permeability increasing method combining hydraulic fracturing and methane in-situ combustion explosion | |
| CN102140901B (en) | High pressure resistant drilled hole sealing method | |
| CN109209472B (en) | Punching, blasting and water injection mutual coupling coal seam pressure relief and outburst prevention method | |
| CN104612746B (en) | -quick-fried manifold type coal body anti-reflection method is cut in a kind of boring | |
| RU2704997C1 (en) | Method and device for control of coal bed upper part collapse area due to application of technology of pulsed hydraulic fracturing of a formation | |
| WO2019242191A1 (en) | Hydraulic cutting seam and multistage combustion shock wave combined coal-fracturing gas extraction method | |
| CN106437669B (en) | A kind of thermal cracking seam method and system for deep hot dry rock formation production | |
| CN105332684A (en) | High-pressure water burst and CO2 fracturing combined coal bed gas displacement extraction technology | |
| CN104500019A (en) | Reinforced anti-reflection method for promoting gas extraction | |
| CN203891922U (en) | Effective extraction system for gas in coal seam | |
| CN105927268B (en) | Gas fires the anti-reflection pumping method in coal seam in a kind of induction extraction later stage drilling hole | |
| CN107120137B (en) | A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method | |
| CN112761586B (en) | Drilling methane self-circulation blasting fracturing enhanced extraction method | |
| CN109025936A (en) | Underground coal mine burning shock wave fracturing coal body strengthens gas pumping method and equipment | |
| CN112943343A (en) | Efficient and rapid fire extinguishing method for ground drilling of different types of fire in coal mine goaf | |
| CN108801086A (en) | Deep hole loosens stress pre-released hydraulically blasting method and device | |
| CN112761587B (en) | Drilling methane multistage pulse energy-gathering blasting enhanced extraction method | |
| CN105986801A (en) | Method and device for explosive fracturing of sidetracking well | |
| CN113153296A (en) | Method for rock cross-cut coal uncovering through linkage of hydraulic slotting and hot-cold cycle impact | |
| CN116025408A (en) | Ground long-drilling multistage water seal loosening blasting fracturing device and method | |
| CN116517615A (en) | Enhanced extraction method for coal body by controllable electric pulse burning explosion gas fracturing in drilling | |
| CN210217705U (en) | Shale fracturing device | |
| CN111828082B (en) | Coal bed permeability increasing method with cooperation of chemical extraction and liquid explosive | |
| CN107842350A (en) | A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |