CN102418549B - Technical method for extracting coal bed methane from constructed coal development area - Google Patents
Technical method for extracting coal bed methane from constructed coal development area Download PDFInfo
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- CN102418549B CN102418549B CN 201110231564 CN201110231564A CN102418549B CN 102418549 B CN102418549 B CN 102418549B CN 201110231564 CN201110231564 CN 201110231564 CN 201110231564 A CN201110231564 A CN 201110231564A CN 102418549 B CN102418549 B CN 102418549B
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Abstract
The invention discloses a technical method for extracting coalbed methane from a constructed coal development area. The method comprises the following steps: (1) drilling a vertical shaft from the ground to a rock stratum; (2) drilling at the rock stratum; (3) carrying out shock blasting on the rock stratum; (4) drilling the vertical shaft to reach the depth of a coal bed and drilling at the coalbed; (5) carrying out pressure kick on the coal bed; and (6) carrying out development production on the coal bed, wherein the rock stratum area is positioned above a coal bed roof, the drilling direction of the rock stratum is parallel to the coal bed roof, and a distance is reserved between the rock stratum and the coal bed roof. By utilizing the technical method for extracting coalbed methane from the constructed coal development area, the pressure difference between the coal bed and the outside can be increased, and the air permeability of the coal bed is increased, so that the methane extraction effect of the constructed coal development area is greatly improved.
Description
Technical field
The present invention relates to the coal-bed gas exploitation field, especially a kind of structure coal is grown district's extraction coal bed gas process.
Background technology
Coal-bed gas is a kind of clear energy sources, but for Coal Production a kind of disaster source especially.Take which kind of process means to come out the methane gas extraction in the coal seam, can mine safely and efficiently again is one of emphasis problem of coal production person and gas control worker research always.At present, to coal and the outstanding genesis mechanism of gas, everybody relatively more consistent view is to think by coal body structure, gas, the coefficient result of geostatic stress three.Wherein, the destructiveness of coal has determined the outstanding intensity of gas to a certain extent, simultaneously, the zone that the structure coal is grown mainly is subjected to the effect of tectonic stress, very easily forms stress and concentrates, simultaneously, the coal body structure is subjected to destruction to a certain degree, and the porous dehiscence slot sytem obtains changing, and gas is easier to be gathered; These have all increased the outstanding danger of coal and gas, not only affect coal production speed, the more important thing is and may endanger personal safety.How effectively extracting the structure coal grows the gas in district and can reduce the danger that coal and gas are given prominence to greatly.
The main means of gas control are extraction, and the difference of the gas permeability of coal bed gas and coal seam reservoirs pressure and external pressure is the important parameter that influences the extraction effect during extraction.Waterpower is extruded, hydraulic slotted liner technique, fracturing etc. are the important means of carrying out reservoir reconstruction.The structure coal is grown the district, and coal body is soft, is easy to the hole of collapsing during boring; Simultaneously, even pore-forming, when transforming in these coal seams, because of coal crack agensis own, present various process meanses are not satisfactory to the gas permeability change of structure coal, even local the change arranged, but the change scope is also very limited.How taking a kind of technology, can change the gas permeability that the structure coal is grown district's structure coal, can guarantee the pressure differential in coal seam reservoirs pressure and extraneous space again, is to improve the structure coal to grow the difficult problem that district's gas pumping effect needs to be resolved hurrily.
Summary of the invention
The purpose of this invention is to provide a kind of coal seam and extraneous pressure reduction of making increases, and increases the gas permeability in coal seam own, and the structure coal that structure coal growth district's gas drainage under suction effect is improved is greatly grown district's extraction coal bed gas process.
For achieving the above object, the present invention adopts following technical scheme: a kind of structure coal is grown district's extraction coal bed gas process, it is characterized in that: comprise the steps: that (1) open straight well from ground and get into the rock stratum, (2) creep into the rock stratum, (3) the coal seam degree of depth is crept into straight well in rock stratum loosening blasting, (4) again, carries out the coal seam and creeps into, (5) coal seam pressure excitement, (6) coal seam Development and Production; Described formation area is positioned on the roof, and the rock stratum drilling direction is parallel with roof and have at interval.
Described rock stratum is crept into and is on the roof in 5～20m scope, the thickness 〉=4.5m of rock stratum, and when seam inclination＜30 °, the rock stratum is crept into up or down and all can; When seam inclination 〉=30 °, upwards creep into the rock stratum, and it is consistent that trend is crept in rock stratum drilling direction and coal seam; At rock stratum section boring length 〉=700m, the rock stratum is crept into drilling direction with the institute working seam and is level or laterally creeps into and be parallel to each other.
The rock stratum is by behind the rod boring of rock stratum, explosive is delivered to the suitable position of rockhole by the rock stratum drilling rod, explosive is divided into an amount of many branches, repeatedly evenly place, adopt conventional striker to ignite at the straight well wellbore section, by igniting a small amount of explosive in the pit shaft, the lead-in wire of rock stratum section is ignited last ignition charge; Explosive type adopts emulsion.
The coal seam is crept into the pressure excitement in coal seam and is all crept into by structure coal growth district, anti-reflection integrated apparatus is realized, the structure coal is grown the district and is crept into, anti-reflection integrated apparatus comprises the drilling rod that the rear end is connected with rig, the drilling rod front end is provided with drill bit, drilling rod shaft outer ring is coated with air bag at interval, drilling rod shaft between adjacent two air bags is provided with gas pressure break hole, described air bag is connected with air pump by the gentle pressure pipe of air bag pipeline road respectively with gas pressure break hole, air pump is connected with gas tank, be connected with the cutting blade around the drilling rod shaft between the rear end of described drill bit and the drilling rod, cutting blade be obliquely installed and the tip backward, it is sagittal two-way drill bit that described cutting blade and drill bit constitute drilling direction, the rotation direction of cutting blade is opposite with the drill bit rotation direction, and bit diameter is greater than drill pipe diameter;
The structure coal is grown the district and is crept into, drilling rod rear end in the anti-reflection integrated apparatus is connected with the rotating disk of rig, the gentle pressure pipe of corresponding air bag pipeline road offers air bag pipeline hole respectively on the rotating disk, the pneumatic circuit hole, air bag pipeline hole, the pneumatic circuit hole is connected with tubulose air bag steel joint and pore steel joint respectively, the air bag pipeline is the high-pressure hose that is connected between air bag steel joint and the drilling rod shaft upper gasbag hole, pneumatic circuit is to be connected in the high-pressure hose between the gas pressure break hole on pore steel joint and the drilling rod shaft, the gentle pressure pipe of air bag pipeline road all is positioned at drilling rod, and the air bag steel joint is communicated with a middle high-pressure hose again respectively with the pore steel joint and is connected with air pump; High-pressure hose is provided with pressure meter and air valve in the middle of described, and gas tank is connected at least two and also finally is connected with air pump, and each gas tank all has air valve, and described gas tank is the nitrogen gas tank of interior dress nitrogen;
Also comprise the annular solid that is welded in the drilling rod shaft, and annular solid offers gas pressure break groove along the surface, border, gas pressure break groove is over against gas pressure break hole, and described pneumatic circuit is communicated with gas pressure break hole by gas pressure break groove; Two air bags are set on the drilling rod altogether at interval;
After the coal seam stops to creep into, carry out coal seam pressure when exciting, booster air pump, by the air bag pipeline to the pressurization of ventilating of two air bags, after reaching predetermined pressure, close air pump, connect pneumatic circuit, the starting pressure air pump, begin to carry out the pressure excitement, open the air valve valve then, energy is discharged, so repeatedly; Pass through the nitrogen pressure excitement when coal seam pressure is exciting.
Creep into length and be no more than 100 meters in the coal seam, the long 80-90 rice of described drilling rod shaft arranges two air bags on the drilling rod altogether at interval, and the spacing of two air bags is 50 meters, and the sealing of hole pressure of air bag is not less than 20Mpa.
Described structure coal grows that the district creeps into, anti-reflection integrated apparatus comprises that also an end interted rotating disk and enters in the drilling rod, the other end connects the cooling water pipe of air pump and water pump respectively by pipeline, the pump outlet place connects water valve, water pump is connected with the water source, drill bit is provided with cooling water hole, and the shaft of cutting blade downside also is provided with cooling water hole.
Rock drilling tool is the structure coal and grows that creep in the district, anti-reflection integrated apparatus.
It is poor to the present invention is directed to structure coal growth district structure coal gas permeability, reservoir pressure and extraneous pressure reduction are little, the difficult problem of extraction weak effect, by in the roof sand layers, beating lateral aperture, make cave technology by loosening blasting and air, the sand layers crack is improved greatly, and roof pressure obtains discharging; By in the coal seam, utilizing the self-control drill bit, the coal seam is cut, cut, the gas permeability in coal seam is increased, thereby realize the abundant release of structure coal growth district's roof, coal seam and extraneous pressure reduction increase, and the gas permeability in coal seam own increases, and make the structure coal grow the purpose that gas drainage under suction effect in district's is improved greatly.
By carry out the problem that the coal bed gas extraction efficiently solves tectonic province pore-forming difficulty in the rock stratum.
Efficiently solve the difficult problem that the tectonic province coal body is difficult to strengthen, the tectonic province coal body also can effectively be strengthened.
By loosening blasting and the exciting effectively combination of pressure, can make the good perforation of realization between petrosal foramen and the coal body.
Description of drawings
Fig. 1 is principle process block diagram of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is that creep in structure coal growth district, the structural representation of anti-reflection integrated apparatus.
The specific embodiment
Grow district's extraction coal bed gas process by Fig. 1-a kind of structure coal shown in Figure 3, comprise the steps:
(1) opening straight well from ground gets into the rock stratum and creeps into, straight well will arrive roof strata 33 from ground through overlying rock 34 earlier again, roof strata 33 is the described formation area that will creep into, this zone is positioned on the roof, the rock stratum is crept into and is on institute's working seam top board in 5～20m scope, the rock stratum of creeping into is harder rock stratum, the thickness 〉=4.5m of rock stratum; (rock stratum is crept into and is on institute's working seam top board in 5～20m scope, thickness 〉=the 4.5m of rock stratum, grow the optimum condition of distinguishing extraction coal bed gas process for structure coal of the present invention, if do not reach this condition, the staff also can according to circumstances adopt additive method extraction coal bed gas.）
(2) creep into the rock stratum: when seam inclination＜30 °, the rock stratum is crept into up or down and all can; When seam inclination 〉=30 °, upwards creep into the rock stratum, and it is consistent that trend is crept in rock stratum drilling direction and coal seam; At rock stratum section boring length 〉=700m; Rock stratum drilling direction and roof parallel interval arrange, and the rock stratum is crept into drilling direction with the institute working seam and is level or laterally creeps into and be parallel to each other;
(3) rock stratum loosening blasting: after creep into by rock drilling tool the rock stratum, explosive is delivered to the suitable position of rockhole by the rock stratum drilling rod, explosive is divided into an amount of many parts, repeatedly evenly place, adopt conventional striker to ignite at the straight well wellbore section, by igniting a small amount of explosive in the pit shaft, the lead-in wire of rock stratum section is ignited last ignition charge; Explosive type adopts emulsion;
(4) again straight well is crept into the degree of depth in coal seam 32, carry out the coal seam and creep into;
(5) coal seam pressure excitement;
(6) coal seam Development and Production.
Described coal seam is crept into and is grown by the structure coal all with the pressure excitement in coal seam that creep in the district, anti-reflection integrated apparatus 31 is realized, the structure coal grows that creep in the district, anti-reflection integrated apparatus 31 structures are as follows:
Grown by structure coal shown in Figure 3 that creep in the district, anti-reflection integrated apparatus 31 comprises the drilling rod 10 that the rear end is connected with the rotating disk 8 of rig, rotating disk 8 is by the transmission device drive of rig.(rig and rotating disk 8 thereof, transmission device and rotating disk 8 are prior art with the connected mode of drilling rod 10 ends, so be not described in detail.）
Drilling rod 10 front ends are provided with drill bit 19, are connected with several between the rear end of described drill bit 19 and the drilling rod 10 around the cutting blade 18 of drilling rod 10 shafts, cutting blade 18 be obliquely installed and the tip backward, the rotation direction of cutting blade 18 is opposite with drill bit 19 rotation directions.The tip of drill bit 19 forward, it is sagittal two-way drill bit that cutting blade 18 constitutes drilling directions with drill bit 19.Described drill bit 19 is provided with cooling water hole 21, and drilling rod 10 shafts of cutting blade 18 downsides also are provided with cooling water hole 22.
Described drilling rod 10 shafts are provided with for the external screw thread 9 of discharging ickings.Shaft outer ring, drilling rod 10 middle part between drilling rod 10 rear ends and drill bit 19 is coated with two annular air-pockets 12 at interval, the long 80-90 rice of described drilling rod 10 shafts, the spacing of two air bags 12 is 50 meters, drilling rod 10 shafts between two air bags 12 are provided with gas pressure break hole 15, described air bag 12 is connected with air pump 25 with pneumatic circuit 13 by air bag pipeline 11 respectively with gas pressure break hole 15, be that corresponding air bag pipeline 11 and pneumatic circuit 13 offer air bag pipeline hole respectively on the rotating disk 8, the pneumatic circuit hole, air bag pipeline hole, the pneumatic circuit hole is connected with tubulose air bag steel joint 7 and pore steel joint 26 respectively, air bag pipeline 11 is for being connected in the high-pressure hose between air bag steel joint 7 and the drilling rod 10 shaft upper gasbag holes, pneumatopyle is the hole of communicated air bags 12 on drilling rod 10 shafts, because air bag 12 is two, so air bag pipeline 11 also is two, corresponding two air bag pipelines 11 arrange two air bag steel joints 7 in two air bag pipeline holes on the rotating disk 8; Be welded with annular solid 14 in drilling rod 10 shafts, be that edge, annular solid 14 border is welded in drilling rod 10 shafts, (drilling rod 10 connects for multistage, for the ease of making, annular solid 14 can be welded on earlier in that section drilling rod 10 that gas pressure break hole 15 is set, and merges with other drilling rods 10 to be connected again.) and annular solid 14 offer gas pressure break groove 16 along the surface, border, gas pressure break groove 16 openings are over against gas pressure break hole 15, annular solid 14 is provided with the connecting hole 17 that is communicated with gas pressure break groove 16, described pneumatic circuit 13 is for being connected in the high-pressure hose between the gas pressure break hole 15 on pore steel joint 26 and drilling rod 10 shafts, and namely described pneumatic circuit 13 access connecting holes 17 are communicated with gas pressure break hole 15 by gas pressure break groove 16.Described air bag pipeline 11 and pneumatic circuit 13 all are positioned at drilling rod 10, and the air bag pipeline 11 of annular solid 14 rear sides can intert in the past by the inner diameter hole of annular solid 14.
Described each air bag steel joint 7 is communicated with a middle high-pressure hose 4 again respectively with pore steel joint 26 to be realized being connected with air pump 25, and high-pressure hose 4 is equipped with pressure meter 5, air valve valve 6, flow meter and pressure gauge in the middle of each.Air pump 25 is connected with gas tank 1, and gas tank 1 is connected two and finally be connected with air pump 25 at least, and by high-pressure hose 3 four gas tanks 1 of connecting altogether, each gas tank 1 all has air valve 2 in the present embodiment.
Comprise that also an end interted rotating disk 8 and enters in the drilling rod 10, the other end connects the high-pressure cooling water pipe 27 of air pump 25 and water pump 28 respectively by pipeline, and the delivery port place of water pump 28 connects water valve, and water pump 28 is connected with water source 29.Water source 29 can be pond or water pot.
Creep in structure coal growth of the present invention district, anti-reflection integrated apparatus 31, has constituted three systems altogether, i.e. pressure system 24, sealing system 23, drilling system 20.
One. drilling system 20
Drilling system 20 comprises Rotary table for drilling machine 8, drilling rod 10, two-way drill bit, cooling water hole 21,22 etc., and this system carries out creeping into and playing booster action for extracting of drilling tool of coal seam.
Two-way drill bit is installed at drill bit 19 places by this system.For the technology that simplifies the operation, both rotate with drilling rod 10 simultaneously in drilling process, but direction of rotation is opposite, and both all are welded on the drilling rod 10.When creeping into forward, got out bigger space owing to preceding drill bit 19, so the back drill body is inoperative substantially.When outwards extracting drilling tool, the main cause that drilling tool is difficult to extract is blocked at drill bit 19 places exactly, at this moment can start the rig rotation, utilizes cutting blade 18 to cut coal body, owing to be that therefore secondary creeps into and can extract easily.If can't extract, then can become flexible by the exciting device of starting pressure.
The ickings that gets out is discharged by the screw thread on the drilling rod 10.Discharge power just by the machinery rotation, again by containing the blast effect of low amounts of water.Because broken coal is difficult for contacting with water, mainly discharges ickings by wind-force at this, a spot of water both can improve the carrying capacity of wind, simultaneously can cold drill bit 19.Discharge by cooling water hole 21,22 after the cooling.The water hole of logical cooling water can be set in the center on the Rotary table for drilling machine 8.The gas that wherein is mixed with low amounts of water is pumped into high pressure high-pressure cooling water pipe 27 by water pump 28 and high-pressure pump 25, enters drilling rod 10 then.
Two. sealing system 23
Finish creep into after, there is no need to carry out again the pressure excitement for the very broken coal body that is difficult to pore-forming.For can pore-forming, coal body be very broken boring relatively.Drilling tool is moved to suitable position.Start 25 pairs of closed airbags 12 of high-pressure pump then and begin inflation, up to reaching predetermined pressure, wherein predetermined pressure is greater than maximum surge pressure.Valve-off after air bag 12 complete closed is avoided gas leakage.
Closed airbag 12 is fixed on the drilling rod 10, and in order to reach better strengthening effect, the distance between two closed airbags 12 is advisable with 50m, and concrete condition is decided on on-site actual situations.In drilling process, air bag 12 tightly is attached on the drilling rod 10 by elasticity, can not influence ickings and flow out on the limit from it.Air bag 12 is annular, is looped around on the drilling rod 10.
Three. pressure system 24
An annular solid 14 is installed at the exciting place of pressure, is welded on the drilling rod 10, is communicated with by gas pressure break hole 15 between the gas pressure break groove 16 of annular solid 14 and the coal body.When carrying out the pressure excitement, gases at high pressure flow to the exciting place of pressure by pneumatic circuit 13, interact then and between the coal body.Gases at high pressure are by high-pressure pump 25 acquisition of pressurizeing.Maximum pressure is the bigger the better, and minimum is not less than 15Mpa.Concrete surge pressure and exciting number of times are decided according to performance.
Creep in structure coal growth of the present invention district, anti-reflection integrated apparatus 31 concrete steps in use are as follows:
1. pressure system 24 is placed straight well well head place, the face of land, the place arranges wellhead assembly at well head, creep in structure coal growth district, high-pressure hose and other pipelines of anti-reflection integrated apparatus 31 all pierce into by wellhead assembly, wellhead assembly is prior art, play the effect of stationary positioned, so be not described in detail.
2. get the device of gas tank 1 ready, the testing fixture tightness.
3. drill bit 19 is installed, is carried out the coal seam section and creep into.
4. creep into after the end, determine whether to carry out the pressure excitement according to the coal body situation.
5. when pressure is exciting, start high-pressure pump 25, pressurize by 11 pairs of two air bags 12 of air bag pipeline, reach predetermined pressure after, close air pump 25.
6. connect pneumatic circuit 13, starting pressure air pump 25 begins to carry out the pressure excitement, opens air valve valve 6 then suddenly, energy is discharged, so repeatedly several times.After two air bags 12 fill and rise, but the ickings between shutoff two air bags 12 is more conducive to the gas pressure break, improves the gas permeability of coal.
7. all carried out reservoir reconstruction up to every section.Open rig, drilling equipment is extracted from the coal hole.
8. boring is sealed, insert extraction pipeline and carry out extraction.
9. collating unit.
Be the structure coal at rock drilling tool described in the step (3) and grow that creep in the district, anti-reflection integrated apparatus 31, concrete use is the same, does not need the pressure excitement when creep into the rock stratum, so this drilling rod only uses in creeping into and creeps into function and get final product.From the straight well to the level or creep into horizontal rock stratum and straight well creeps into all and can realize by whipstock to level or horizontal coal seam, whipstock and using method thereof are prior art commonly used, so be not described in detail.
Claims (7)
1. a structure coal is grown district's extraction coal bed gas process, it is characterized in that: comprise the steps: that (1) open straight well from ground and get into the rock stratum, (2) creep into the rock stratum, (3) rock stratum loosening blasting, (4) again straight well is crept into the coal seam degree of depth, carry out the coal seam and creep into, the pressure excitement of (5) coal seam, (6) coal seam Development and Production; Described formation area is positioned on the roof, and the rock stratum drilling direction is parallel with roof and have at interval.
2. structure coal as claimed in claim 1 is grown district's extraction coal bed gas process, it is characterized in that: described rock stratum is crept into and is on the roof in 5～20m scope, thickness 〉=the 4.5m of rock stratum, when seam inclination＜30 °, the rock stratum is crept into up or down and all can; When seam inclination 〉=30 °, upwards creep into the rock stratum, and it is consistent that trend is crept in rock stratum drilling direction and coal seam; At rock stratum section boring length 〉=700m, the rock stratum is crept into drilling direction with the institute working seam and is level or laterally creeps into and be parallel to each other.
3. structure coal as claimed in claim 1 or 2 is grown district's extraction coal bed gas process, it is characterized in that: after creep into by rock drilling tool the rock stratum, explosive is delivered to the suitable position of rockhole by the rock stratum drilling rod, explosive is divided into an amount of many parts, repeatedly evenly place, adopt conventional striker to ignite at the straight well wellbore section, by igniting a small amount of explosive in the pit shaft, lead-in wire to the rock stratum section is ignited, last ignition charge; Explosive type adopts emulsion.
4. structure coal as claimed in claim 3 is grown district's extraction coal bed gas process, it is characterized in that: the coal seam is crept into the pressure excitement in coal seam and is all crept into by structure coal growth district, anti-reflection integrated apparatus is realized, the structure coal is grown the district and is crept into, anti-reflection integrated apparatus comprises the drilling rod that the rear end is connected with rig, the drilling rod front end is provided with drill bit, drilling rod shaft outer ring is coated with air bag at interval, drilling rod shaft between adjacent two air bags is provided with gas pressure break hole, described air bag is connected with air pump by the gentle pressure pipe of air bag pipeline road respectively with gas pressure break hole, air pump is connected with gas tank, be connected with the cutting blade around the drilling rod shaft between the rear end of described drill bit and the drilling rod, cutting blade be obliquely installed and the tip backward, it is sagittal two-way drill bit that described cutting blade and drill bit constitute drilling direction, the rotation direction of cutting blade is opposite with the drill bit rotation direction, and bit diameter is greater than drill pipe diameter;
The structure coal is grown the district and is crept into, drilling rod rear end in the anti-reflection integrated apparatus is connected with the rotating disk of rig, the gentle pressure pipe of corresponding air bag pipeline road offers air bag pipeline hole respectively on the rotating disk, the pneumatic circuit hole, air bag pipeline hole, the pneumatic circuit hole is connected with tubulose air bag steel joint and pore steel joint respectively, the air bag pipeline is the high-pressure hose that is connected between air bag steel joint and the drilling rod shaft upper gasbag hole, pneumatic circuit is to be connected in the high-pressure hose between the gas pressure break hole on pore steel joint and the drilling rod shaft, the gentle pressure pipe of air bag pipeline road all is positioned at drilling rod, and the air bag steel joint is communicated with a middle high-pressure hose again respectively with the pore steel joint and is connected with air pump; High-pressure hose is provided with pressure meter and air valve in the middle of described, and gas tank is connected at least two and also finally is connected with air pump, and each gas tank all has air valve, and described gas tank is the nitrogen gas tank of interior dress nitrogen;
Also comprise the annular solid that is welded in the drilling rod shaft, and annular solid offers gas pressure break groove along the surface, border, gas pressure break groove is over against gas pressure break hole, and described pneumatic circuit is communicated with gas pressure break hole by gas pressure break groove; Two air bags are set on the drilling rod altogether at interval;
After the coal seam stops to creep into, carry out coal seam pressure when exciting, booster air pump, by the air bag pipeline to the pressurization of ventilating of two air bags, after reaching predetermined pressure, close air pump, connect pneumatic circuit, the starting pressure air pump, begin to carry out the pressure excitement, open the air valve valve then, energy is discharged, so repeatedly; Pass through the nitrogen pressure excitement when coal seam pressure is exciting.
5. structure coal as claimed in claim 4 is grown district's extraction coal bed gas process, it is characterized in that: in the coal seam, creep into length and be no more than 100 meters, the long 80-90 rice of described drilling rod shaft, the spacing of two air bags that arrange at interval on the drilling rod is 50 meters, the sealing of hole pressure of air bag is not less than 20Mpa.
6. structure coal as claimed in claim 5 is grown district's extraction coal bed gas process, it is characterized in that: described structure coal grows that the district creeps into, anti-reflection integrated apparatus comprises that also an end interted rotating disk and enters in the drilling rod, the other end connects the cooling water pipe of air pump and water pump respectively by pipeline, the pump outlet place connects water valve, water pump is connected with the water source, drill bit is provided with cooling water hole, and the shaft of cutting blade downside also is provided with cooling water hole.
7. structure coal as claimed in claim 6 is grown district's extraction coal bed gas process, it is characterized in that: described rock drilling tool is the structure coal and grows that creep in the district, anti-reflection integrated apparatus.
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| CN108590653B (en) * | 2018-03-02 | 2019-09-03 | 煤炭科学技术研究院有限公司 | Coal and gas prominent release energy dissipating cooperates with preventing control method with media property transformation |
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