CN111197497B - Rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method - Google Patents
Rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 113
- 238000004080 punching Methods 0.000 title claims abstract description 112
- 230000035699 permeability Effects 0.000 title claims abstract description 32
- 230000001965 increasing effect Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000011435 rock Substances 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 230000003068 static effect Effects 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 8
- 230000002265 prevention Effects 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000009933 burial Methods 0.000 abstract description 4
- 239000008400 supply water Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011010 flushing procedure Methods 0.000 description 10
- 239000000243 solution Substances 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
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- 230000003203 everyday effect Effects 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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Abstract
The invention discloses a rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method, which is used for constructing an auxiliary roadway; constructing vertical drill holes downwards in the auxiliary roadway, wherein the end points of the vertical drill holes are positioned below the bottom plate of the coal uncovering layer; sealing and fixing the vertical drill holes; three drill holes are constructed at the head of the coal uncovering working face, one drill hole is a slag discharge drill hole and penetrates through the vertical drill hole, the other two drill holes are respectively positioned at two sides of the vertical drill hole, and the three drill holes are subjected to grouting hole sealing; communicating the pressing and punching system with the vertical drilling hole to supply water for pressing and punching; punching and high-pressure water injection punching are sequentially carried out by adopting static pressure water; and after hydraulic pressure punching operation is finished, constructing a plurality of outburst prevention measure holes. The invention has the beneficial effects that: the flow rate of the punching water flow, the punching pressure and the permeability increasing range are increased, and by adopting a hydraulic punching measure combining static water pressure punching and high pressure water pressure punching, the drainage effect of a coal seam with complicated geological conditions, deep burial, high gas pressure and poor air permeability can be effectively improved, and the permeability increasing benefit is realized.
Description
Technical Field
The invention relates to the technical field of coal mine safety production construction, in particular to a hydraulic punching permeability increasing method.
Background
The coal and gas outburst means that broken coal and a large amount of gas are suddenly sprayed to a mining space from the coal body under the action of pressure, and the coal and gas outburst has great destructiveness. The geological structure of the coal seams of Pansan mines is complex, the mining depth is large, the gas pressure of the coal seams is large, the gas permeability of the coal seams is poor, the gas extraction is difficult, and the extraction effect is poor. Therefore, in order to realize the rapid and efficient coal uncovering of the rock cross-cut coal uncovering working face, the poor gas extraction effect is the main problem to be solved urgently at present.
The hydraulic punching measure is that the rock pillar is used as a safety barrier, the coal seam outburst energy is released under a controllable condition by adopting the hydraulic action, a large amount of coal and gas are discharged, the coal and the gas are discharged through a drilling channel, and the coal body around the drilling hole generates displacement towards the axial direction of the drilling hole, so that the coal body around the drilling hole generates expansion deformation and the relative displacement of the coal seam top and bottom plate near the drilling hole, and the stress of the coal seam is reduced. The expansion deformation of the coal body causes the pressure relief of the coal bed, the increase of cracks and the increase of the air permeability of the coal bed, is beneficial to the extraction of gas, the increase of the strength of the coal and the weakening of the outburst power.
The hydraulic punching measure is to use a rock tunnel as a safety barrier and use hydraulic action to flush out partial coal and gas, so that the hydraulic punching measure has better pressure relief and permeability increasing effects, can effectively improve the extraction effect and realize safe and rapid regional outburst elimination; the hydraulic punching measure is successfully tested in the Nantong Ministry in the 70 th of the 20 th century, is popularized and applied to coal mines nationwide, and forms respective technical practice systems of different mining areas.
However, different coal seams need different measures, for example, the cross-cut coal uncovering 5-2 coal working faces of pensane in the Huainan mining area at-730 to-960 m are connected with an inclined roadway, the original process is that the cross-cut layer-penetrating hole punching measure implemented on the cross-cut coal uncovering working faces is generally executed before the working faces are 5m away from the target coal seam normal distance, and the jet holes are excited by cutting of a drill and high-pressure water. As the hole diameter of the drill hole is small, the space of the working surface is limited, the situations that the coal flushing amount is not easy to control during hydraulic punching, the pressure relief space of the coal body is limited, the operation is not safe and the like easily occur, and for the punching and drilling, the flow of water flow for punching is small, the coal body moving around the drill hole after punching is easy to cause the blockage of the drill hole, the continuous punching cannot be realized, and the anti-reflection effect is not ideal. Therefore, the method is still not ideal for the permeability-increasing extraction effect of the coal seam with large buried depth, large gas pressure and poor air permeability and the cross-cut coal uncovering speed, and how to improve the extraction efficiency and ensure the rapid and safe tunneling of the coal roadway is a problem to be solved urgently.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problem of how to solve the problem that the permeability increasing effect of a high-depth and high-gas coal seam is not ideal.
The invention solves the technical problems through the following technical means:
the rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method comprises the following steps:
step S1: constructing an auxiliary roadway above the coal layer to be uncovered; constructing vertical drill holes downwards in the auxiliary roadway, wherein the end points of the vertical drill holes are positioned below the bottom plate of the coal uncovering layer;
step S2: sealing and fixing the vertical drill holes;
step S3: three drill holes are constructed at the head of the coal uncovering working face, one of the three drill holes is a slag discharge drill hole and penetrates through the vertical drill hole, the other two drill holes are respectively positioned at two sides of the vertical drill hole, and the three drill holes are subjected to grouting hole sealing;
step S4, communicating the pressing and punching system with the vertical drilling hole to supply water for pressing and punching; a first stage of water supply punching, punching by adopting static pressure water, and communicating a vertical drilling hole with a slag discharge drilling hole; water is supplied to punch the second stage, the deslagging drill holes are closed, high-pressure water injection is adopted for punching, and the vertical drill holes after fracturing are communicated with the other two drill holes;
step S5: and after hydraulic pressure punching operation is finished, constructing a plurality of outburst prevention measure holes.
According to the invention, the vertical drilling is adopted to construct the coal seam floor, and the pipe fixing and hole sealing are carried out, so that the service life of the punching and drilling hole can be effectively prolonged, and the flow rate of punching water flow, the punching pressure and the anti-reflection range are increased; punching by static pressure water, directly reaming and making holes on the communicated part, forming space potential energy for the second stage, and punching by adopting a high-pressure water process to realize the punching of the whole range of the coal uncovering area through the free surface effect at two ends; by adopting a hydraulic punching measure combining static water pressure punching and high pressure water pressure punching, the drainage effect of the coal seam with complex geological conditions, deep burial, high gas pressure and poor air permeability can be effectively improved, and the permeability-increasing benefit is realized; meanwhile, the implementation of the punching measure can change the property of the coal bed force, weaken the outburst danger of the coal bed and enhance the strength of the coal.
Preferably, the end position of the vertical drilling hole in the step S1 is at least 1 meter below the bottom plate of the coal to be uncovered.
Preferably, in the step S2, a petroleum casing pipe fixing process is used to perform hole sealing and pipe fixing on the vertical drilled hole. The diameter of the vertical drill hole is larger than 200mm, the pipe is fixed and the hole is sealed by the sleeve, the large-diameter vertical pressure punching drill hole is used for benefiting from large diameter, high flow and high pressure, so that the pressure relief space of the coal body is enlarged, coal and gas can be continuously and smoothly discharged along with punching water flow, the permeability increasing effect is improved, and the coal uncovering and extracting efficiency is improved.
Preferably, the three drilling operations in step S3 are performed at positions 7m before the coal uncovering face normal distance from the coal layer to be uncovered.
Preferably, the pressure flushing system in step S4 includes a water tank, a water injection pump, and a high-pressure hose, the downhole water supply pipe is connected to the water tank, the water tank is connected to the water injection pump, and the water injection pump is connected to the vertical drilling inner casing through the high-pressure hose.
Preferably, the water injection device further comprises a flow meter which is arranged on a pipeline between the water tank and the water injection pump.
Preferably, in the step S4, in the step S4, the pressure is maintained at 2 to 5Mpa when the punching is performed by using static pressure water, and the pressure is maintained at 30Mpa or less when the punching is performed after the high pressure water breakdown, and the punching time is 3 to 4 hours per day. Further preferably, the hydrostatic pressure of the water is maintained at 3.5 to 4MPa, and the high-pressure water pressure is maintained at 20MPa or less.
Preferably, in step S4, during the pressing process, the gas concentration is monitored.
Preferably, in step S4, after the press punching is finished, the head-on punching coal amount is cleaned and counted on site.
Preferably, in the step S5, the number of the protrusion prevention holes is at least 180.
The invention has the advantages that:
(1) according to the invention, the vertical drilling is adopted to construct the coal seam floor, and the pipe fixing and hole sealing are carried out, so that the service life of the punching and drilling hole can be effectively prolonged, and the flow rate of punching water flow, the punching pressure and the anti-reflection range are increased; punching by static pressure water, directly reaming and making holes on the communicated part, forming space potential energy for the second stage, and punching by adopting a high-pressure water process to realize the punching of the whole range of the coal uncovering area through the free surface effect at two ends; by adopting a hydraulic punching measure combining static water pressure punching and high pressure water pressure punching, the drainage effect of the coal seam with complex geological conditions, deep burial, high gas pressure and poor air permeability can be effectively improved, and the permeability-increasing benefit is realized; meanwhile, the implementation of the punching measure can change the property of the coal bed force, weaken the outburst risk of the coal bed and enhance the strength of the coal;
(2) the diameter of the vertical drill hole is large, the pipe is fixed and the hole is sealed by the sleeve, the large-diameter vertical pressure punching drill hole is used for benefiting from large diameter, high flow and high pressure, so that the pressure relief space of the coal body is enlarged, coal and gas can be continuously and smoothly discharged along with punching water flow, the permeability increasing effect is improved, and the coal uncovering extraction efficiency is improved.
(3) The hydraulic punching test is carried out by adopting a punching mode combining static pressure water and high pressure water, so that the safety and controllability of the pressed gas are realized, water and slag are stably discharged, an effective technical route is determined for coal uncovering permeability-increasing measures of a downhill tunnel, and the hydraulic punching test has good popularization and application values;
(4) the direction is pointed out for next optimization, the static water pressure punching and the high pressure water pressure punching are combined for permeability increase, the static water pressure punching effect and the high pressure water pressure punching radius of the large-diameter vertical pressure punching drill hole are indirectly inspected, and the arrangement mode of the large-diameter vertical pressure punching drill hole and the release hole is determined and used for guiding the implementation of the permeability increase measures of the hydraulic punching.
Drawings
FIG. 1 is a schematic cross-sectional view of a hydraulic ram borehole design according to an embodiment of the present invention;
FIG. 2 is a schematic view of vertical borehole sealing;
FIG. 3 is a schematic view of a press system installation;
fig. 4 is a schematic view of a bump guard hole.
Reference numbers in the figures: the system comprises an auxiliary roadway 1, a vertical drilling hole 2, a drilling hole 3, a dual-resistance pipe 31, a 4-branch slurry injection pipe 32, a 4-branch slurry return pipe 33, a pressure flushing system 4, a water tank 41, a water injection pump 42, a pressure gauge 421, a gate valve 422, a high-pressure hose 43 and a 5-2 coal seam A.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method is explained by adopting hydraulic punching comprehensive permeability increasing on a working face for uncovering 5-2 coal in a cross drift of-730 to-960 m, wherein a 5-2 coal bed A is a coal layer to be uncovered, and the method comprises the following steps of:
step S1: constructing an auxiliary roadway 1 above the 5-2 coal seam A, wherein the elevation of a roadway top plate is-814 m, and the vertical distance between the roadway top plate and 5-2 coal is 74 m; constructing a vertical drill hole 2 (with the hole number Z1#) with the diameter phi of 246mm downwards in the auxiliary roadway 1, wherein the end point of the vertical drill hole 2 is positioned below 1 m below the bottom plate of the 5-2 coal seam A; the process parameters are as follows in table 1:
step S2: hole sealing and pipe fixing are carried out on the vertical drilled hole by adopting a phi 177.8mm petroleum casing pipe fixing process;
according to the embodiment, the large-diameter vertical pressure punching drill hole is adopted, and benefits from large diameter, high flow and high pressure, so that the pressure relief space of the coal body is increased, coal and gas can be continuously and smoothly discharged along with the punching water flow, the permeability increasing effect is improved, and the coal uncovering extraction efficiency is improved.
Step S3: as shown in fig. 1, three drill holes 3 are constructed at the head of a coal uncovering working face, specifically, before a-730 to-960 m connection inclined roadway (lower segment) normal is 7m away from 5-2 coal, 3 drill holes 3 (with the hole numbers of C1#, C2#, and C3#) are constructed, wherein a Z1# drill hole is drilled through a C1# hole and is used as a hydraulic pressure water flushing and slag discharging hole, C2# C3# drill holes are respectively arranged at the left side and the right side of the Z1# drill hole, and the specific parameters are the technical parameters of each drill hole in the following table 2:
and grouting and sealing the three drill holes. As shown in fig. 2, for example, grouting and sealing a C1# drill hole, a 3-inch double-resistance pipe is used in the hole to be inserted into a C1# drill hole, a hole packer is arranged at the bottom between the 3-inch double-resistance pipe 31 and the C1# drill hole, the hole bottom and an orifice section are both plugged by cement slurry, and a 4-inch grouting pipe 32 and a 4-inch grout returning pipe 33 are arranged in the orifice section for grouting; the hole sealing length is not less than 20 meters, the length of the hole opening cement segment is not less than 1 meter, and the length of the hole bottom cement segment is not less than 1.5 meters.
Step S4, communicating the pressing and punching system 3 with the vertical drilling hole to supply water for pressing and punching; a first stage of water supply punching, punching by using static pressure water, wherein the vertical drilling hole is communicated with the slag discharge drilling hole, and the punching pressure is kept at 3.5-4 Mpa; a second stage of water supply punching is carried out, the deslagging drill holes are closed, high-pressure water injection punching is adopted, the pressure is controlled to be lower than 20Mpa, and the vertical drill holes are communicated with the other two drill holes after fracturing;
as shown in fig. 4, the pressure flushing system 4 includes a water tank 41, a water injection pump 42, a high pressure hose 43, a downhole water supply pipe is connected to the water tank 41, the water tank 41 is connected to the water injection pump 42, the water injection pump 42 is connected to the inner casing of the vertical borehole 1 through the high pressure hose 43, and the water injection pump 42 is provided with a pressure gauge 421, a gate valve 422, and a pressure release valve.
Specifically, a BZW-200/56 water injection pump and matched equipment thereof are used, the working pressure can reach 56Mpa, the water yield is 200L/min, and the power of a motor is 185 Kw. The water injection pump 42 is arranged in an inclined roadway of the gangue belt conveyor with the independent ventilation system roadway of-817-842 m and realizes gas electric locking with a monitoring probe in the water outlet roadway, the water injection pump further comprises a flow meter arranged on the water inlet side of the water injection pump 42, and after being pressurized by the water injection pump 42, the water injection pump is connected to a Z1# inner petroleum casing pipe by a double-phi 19mm high-pressure rubber pipe and a quick connector for pressure flushing.
Step S5: and after hydraulic pressure punching operation is finished, constructing a plurality of outburst prevention measure holes.
By adopting a hydraulic punching measure combining static water pressure punching and high pressure water pressure punching, the drainage effect of the coal seam with complex geological conditions, deep burial, high gas pressure and poor air permeability can be effectively improved, and the permeability-increasing benefit is realized; meanwhile, the implementation of the punching measure can change the property of the coal bed force, weaken the outburst danger of the coal bed and enhance the strength of the coal.
Example two:
in this embodiment, on the basis of the first embodiment, the specific operation process of step S4 is as follows:
first stage, hydrostatic pressure flushing
On days 1 to 16, punching with static water under 3.5-4Mpa for 3-4 hr per shift, observing with special person, flushing with static water to communicate the Z1 hole with the C1 hole, and spraying water and coal flow out of the C1 hole with water injection amount of 250m3And the coal yield is 20 tons.
Second stage, high pressure water pressure flushing
Closing the hole C1# from the 17 th to the 31 th day, and adopting a water injection pump to carry out high pressureThe water injection pressure is controlled to be below 20Mpa, after fracturing, the hole Z1# is communicated with the holes C2# and C3# and water and coal are sprayed from the holes C2# and C3# with the total water injection quantity of 268m3And the extruded coal amount is 26 tons.
Two stages, press time and coal quantity table 3 details as follows:
as can be seen from the above table, the total water pressure was 518m3The extruded coal amount is 46 tons, and the total volume of the extruded coal is 32.8m3。
And during the static pressure water pressure punching stage, a water pressure meter and a flow meter are arranged on the high-pressure water pipe to conduct punching parameter investigation. During high-pressure punching, a monitoring system of a BZW-200/56 water injection pump is used for carrying out examination on punching parameters.
A high-low concentrated gas sensor is arranged in a range of 10-15 m away from a first air gathering point at the head-on of a lower section of a communication inclined roadway of-730-960 m, a set of automatic gas extraction metering device is arranged on a gas extraction pipeline, and the change condition of the gas concentration in the roadway and the gas extraction pipeline in the pressing and flushing process is monitored.
The coal quantity rushing out from the head is cleaned every day and is counted on site.
Example three:
as shown in fig. 4, on the basis of the second embodiment, 180 outburst prevention measure holes are constructed on the working face at present; constructing according to actual needs;
the gas main pipe extraction amount is examined as the following table 4:
after 34 days (the pressing is finished), the average single-hole extraction purity reaches 0.0148m3Min, the pure quantity of the extraction in one hundred holes is 1.48m3/min。
Taking the uncovered coal bed B as an example, when the working face uncovers the coal bed B, the actually measured gas pressure of the coal bed B is 1.5MPa, the gas content is 6.7m3/t, the conditions are basically similar, no anti-reflection measures are taken, the average single-hole extraction purity of the working face is 0.0047m3/min, and the hundred-hole extraction purity is 0.47m 3/min.
Through comparative analysis, after a high-pressure hydraulic punching permeability-increasing measure is adopted, the extraction pure quantity of the hundred holes of the rock cross-cut coal uncovering working face is increased from 0.47m3/min to 1.48m3/min, and is increased by 314.9%. Effectively reduces the original gas content of the coal bed and achieves the purpose of permeability increase. After the coal body is wet, the analysis speed of residual gas can be reduced, and the gas expansion energy can be reduced.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method is characterized by comprising the following steps of:
step S1: constructing an auxiliary roadway above the coal layer to be uncovered; constructing vertical drill holes downwards in the auxiliary roadway, wherein the end points of the vertical drill holes are positioned below the bottom plate of the coal uncovering layer; the diameter of the vertical drilling hole is larger than 200 mm;
step S2: sealing and fixing the vertical drill holes;
step S3: three drill holes are constructed at the head of the coal uncovering working face, one of the three drill holes is a slag discharge drill hole and penetrates through the vertical drill hole, the other two drill holes are respectively positioned at two sides of the vertical drill hole, and the three drill holes are subjected to grouting hole sealing;
step S4, communicating the pressing system with the vertical drilling hole to perform water supply pressing; a first stage of water supply punching, punching by adopting static pressure water, and communicating a vertical drilling hole with a slag discharge drilling hole; water is supplied to punch the second stage, the deslagging drill holes are closed, high-pressure water injection is adopted for punching, and the vertical drill holes after fracturing are communicated with the other two drill holes; when static pressure water is used for punching, the pressure is kept at 3.5-4Mpa, when high pressure water is used for punching, the pressure is kept below 20Mpa, and the static pressure water punching time is 3-4 hours per day for punching; monitoring the change condition of the gas concentration in the pressing process; a gas sensor is arranged in a range of 10-15 m away from a first air gathering point on a working face to be uncovered, a set of automatic gas extraction metering device is arranged on a gas extraction pipeline, and the gas concentration change condition in a roadway and the gas extraction pipeline in the pressing and punching process is monitored;
step S5: and after hydraulic pressure punching operation is finished, constructing a plurality of outburst prevention measure holes.
2. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method according to claim 1, wherein the end position of the vertical drilling hole in the step S1 is located at least 1 meter below a bottom plate to be uncovered.
3. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method according to claim 1, wherein in the step S2, a petroleum casing pipe fixing process is adopted to carry out hole sealing and pipe fixing on the vertical drilled hole.
4. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method according to claim 1, wherein the three drilling construction positions in the step S3 are 7m from the coal uncovering working face normal to the coal layer to be uncovered.
5. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method is characterized in that in the step S4, the pressure punching system comprises a water tank, a water injection pump and a high-pressure hose, a downhole water supply pipe is connected with the water tank, the water tank is connected with the water injection pump, and the water injection pump is connected with a vertical drilling inner sleeve through the high-pressure hose.
6. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method is characterized by further comprising a flow meter, wherein the flow meter is installed on a pipeline between the water tank and the water injection pump.
7. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method is characterized in that in the step S4, after the punching is finished, the head-on punching coal amount is cleaned and counted on site.
8. The rock cross-cut coal uncovering high-pressure hydraulic punching comprehensive permeability increasing method according to claim 1, wherein in the step S5, the number of the outburst prevention measure holes is at least 180.
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