CN100485163C - Coal bed gas drainage method and device - Google Patents

Coal bed gas drainage method and device Download PDF

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Publication number
CN100485163C
CN100485163C CNB2007100926734A CN200710092673A CN100485163C CN 100485163 C CN100485163 C CN 100485163C CN B2007100926734 A CNB2007100926734 A CN B2007100926734A CN 200710092673 A CN200710092673 A CN 200710092673A CN 100485163 C CN100485163 C CN 100485163C
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China
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valve
hole
nozzle
drill
diameter
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CNB2007100926734A
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Chinese (zh)
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CN101117893A (en
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李晓红
卢义玉
姜德义
赵瑜
康勇
夏彬伟
周东平
陈凌云
左伟芹
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重庆大学
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Abstract

The present invention relates to a gas pumping and exchanging method and devices in a coal mine and coal seam, and belongs to the coal mine security field; the present invention aims to prolong the service life of the drill and improve the drilling depth and the drilling speed, and to enhance the safety during pumping gas and to improve the validation of the coal seam. The present invention is characterized in that the method is performed by following steps: starting a high-voltage water pump, adjusting a valve, drill pushing, hole drilling, adjusting the valve drill rotating, grooving, and shutting down the high-voltage water pump. The devices involved in the method mainly comprises the high-voltage water pump, a mixing chamber, abrasive cans, a high-voltage sealed rotator, a drill, drill pipes and a multifunctional drill; the method uses the multiphase oscillation jet to cut off and break the coal seam and also to drill holes and cut grooves; the power effect leads to the evolution of the coal seam fractured field, thereby improving the validation of the coal seam. And the cinder produced is wee and can flow away with water, thereby avoiding the drill holding and the hole bursting; the method can be used to pump and exchange gas in different quality coal mines and to improve the pumping and exchanging capability of the gas.

Description

A kind of coal bed gas drainage method and device
Technical field
The present invention relates to a kind of colliery coal bed gas drainage method and device, belong to the safety of coal mines field, be specially adapted to the gas drainage under suction of colliery low air permeability coal seam.
Background technology
China is maximum in the world coal producer, simultaneously also be that the colliery the most serious country of disaster accident takes place, gas drainage under suction is the essential measure of control coal mine gas disaster accident, Yuan Liang " method of working seam top board gas drainage under suction (patent No.: CN1532374) ", Chai Zhaoxi " the independent gas drainage under suction mine of spoke-like coal hole layout (patent No.: CN2903390) ", mainly be by changing bore arrangement mode, improve the extraction amount of gas, but it is shallow to exist drilling depth, drill hole density is big, shortcomings such as the effective range of firedamp drainage is little, and cherry coal and projecting coal bed in drill and often cause the hole of collapsing, stick of tool, crown drill, spray orifice phenomenon and because drill bit, the rubbing action of drilling rod and coal petrography causes drill bit drilling rod temperature too high and quickened the rate of wear of drill bit.Because the gas permeability in coal seam is low, the extraction effect of existing drilling method is undesirable, with the coal mine gas hazard management requirement of gas drainage under suction is compared, and China's coal-mine gas drainage under suction effect has much room for improvement.
Summary of the invention:
The object of the invention is to provide a kind of coal bed gas drainage method and device at above-mentioned the deficiencies in the prior art.To avoid bit freezing and to prevent drill bit and coal petrography friction produces high temperature or spark and causes the gas combustion accident, prolongs bit life, improves drilling depth and speed and improve gas permeability of coal seam.
In order to realize the foregoing invention purpose, technical solution of the present invention is:
A kind of coal bed gas drainage method, comprise boring and two parts of grooving, it is characterized in that the polyphase oscillation jet that is produced by axial oscillation nozzle on the drill bit cuts earlier and broken coal, creep into pilot hole, cutting tool on the cut drill further grinds cinder and pilot hole is enlarged, begin rollback when holing to prescribed depth, switch by axle/radial jet, the polyphase oscillation jet that is produced by the radial oscillation nozzle carries out radially grooving again.Be a kind ofly collect boring, solid hole, grooving, dash bits, the hydrodynamic force fracturing is the gas drainage method of one.
This method step is in the following order carried out:
(1) prepares coal bed gas drainage device condition of work: check the firm and sealing of each connecting line in the polyphase oscillation jet coal bed gas drainage device, high-pressure hydraulic pump is executed apart from the coal seam bored point 3~10m;
(2) start high-pressure hydraulic pump 2: the working flow of high-pressure hydraulic pump 2 is 50~300L/min, and operating pressure is 5~40MPa;
(3) control valve: open first stop valve 8 earlier, open second stop valve 6 again, after open the 3rd stop valve 4, after making water under high pressure enter mixing chamber 5 and the abrasive material of abrasive can 7 mixes through high-pressure water pipe, through high-pressure sealed circulator 13, by drilling rod 9, form the ejection of polyphase oscillation jet again via axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2;
(4) rig advances, holes: cutting of polyphase oscillation jet elder generation and broken coal seam that axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 produce, and in the coal seam, creep into pilot hole, by the cutting tool 10-1 on the cut drill 10-2 will cut, coal grinding after the fragmentation, and pilot hole is expanded into gas extraction hole, grinding the back particle diameter is that 0.1~5mm coal particle is discharged fast with backwater; The quasi static pressure of 1~10Mpa that the polyphase oscillation jet of axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 ejection produces in boring supports the gas extraction hole hole wall; After creeping into per 1 drilling rod, close the 3rd stop valve 4, stop rig and advance, rotate, add drilling rod 9, whenever add a drilling rod 9, repeating step 3,4 successively;
(5) judge whether rig continues to creep into: when drilling depth does not reach 20~300m, then continue to creep into repeating step 3,4; When drilling depth reaches 20~300m, then stop to creep into, close the 3rd stop valve 4, stop rig and advance, rotate, spool 10-5 is switched in axle/radial jet insert in the valve body 10-6 hole, close axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2;
(6) control valve: after stopping to creep into, move back drilling rod 9, drilling rod 9 whenever moves back 0.5~10m, opens the 3rd stop valve 4;
(7) rig rotation, grooving: stop to move back drilling rod, water under high pressure is by drilling rod 9, form the ejection of polyphase oscillation jet through radial oscillation nozzle 10-6-1, rotary drill rod 9 allows the polyphase oscillation jet radially carry out the ring-type grooving in the coal seam along gas extraction hole, and the grooving time is 0.5~20min; After cutting a groove, close the 3rd stop valve 4, stop rig 12 rotations, continue grooving, whenever cut groove one time, repeating step 6,7 successively;
(8) judge whether rig continues grooving: when the number of grooving does not reach 2~600, then continue grooving, repeating step 6,7; When the number of grooving reaches 2~600, then stop grooving, close the 3rd stop valve 4, stop rig 12 rotations;
(9) whole hole: close high-pressure hydraulic pump.
A kind of coal bed gas drainage device of realizing said method, this device comprise the cutting tool 10-1 and the connecting line of water tank 1, high-pressure hydraulic pump 2, overflow valve 3, the 3rd stop valve 4, mixing chamber 5, second stop valve 6, abrasive can 7, first stop valve 8, high-pressure sealed circulator 13, rig 12, drilling rod 9, drill bit 10; It is characterized in that drill bit 10 is multi-functional drill bit, the front end of the rear end of this drill bit and drilling rod 9 removably connects, multi-functional drill bit comprises cutting tool 10-1, cut drill 10-2, dividing plate 10-3, pressurize nonreturn valve core 10-4, spool 10-5 and valve body 10-6 are switched in axle/radial jet, and cutting tool is fixedlyed connected with the cut drill front end wing; Cut drill 10-2 profile is a cylinder, on from the wing root end face of cut drill 10-2 to the longitudinal axis the end face thereafter, have successively axial oscillation nozzle 10-2-1 and with the longitudinal axis angle of this axial oscillation nozzle be 1~6 auxiliary vibration nozzle 10-2-2 that is evenly distributed on the same circumference of 0~30 °, cylindrical hole and cut drill connecting hole, axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 communicate with cylindrical hole, and cylindrical hole communicates with the cut drill connecting hole; The circular port that diameter 0.5~8mm, high 0.5~60mm are arranged at the bottom of from the end face of axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 to the hole of cylindrical hole successively, the self-oscillation chamber of diameter 1~24mm, high 0.35~48mm, the circular port of diameter 0.25~6mm, high 5~48mm, the truncated cone-shaped hole of 0~30 ° of tapering, high 0.5~48mm and diameter 0.5~8mm, the manhole of high 0.5~48mm; Valve body 10-6 profile is a cylinder, valve body 10-6 front end and cut drill connecting hole removably connect, on from the front end face of valve body 10-6 to the longitudinal axis the end face thereafter, diameter 10~16mm is arranged successively, the unidirectional valve pocket 10-6-3 of the pressurize of high 10~16mm, diameter 2~11mm, the cylindrical hole of high 10~50mm, diameter 10~30mm, valve pocket, the first seal groove 10-6-2 and valve body connecting hole are switched in the axle of high 20~100mm/radial jet; Valve pocket is switched in the unidirectional valve pocket of pressurize, cylindrical hole, axle/radial jet and the valve body connecting hole communicates; On the axle/radial jet transfer valve cavity wall of valve body 10-6 perpendicular to valve body 10-6 longitudinal axis, have 1~4 radial oscillation nozzle 10-6-1, this nozzle-axis switches at the bottom of the hole of valve pocket 10~16mm and switches valve pocket with axle/radial jet and communicates apart from axle/radial jet, to axle/radial jet transfer valve cavity wall diameter 0.5~8mm is arranged successively from the outer end of radial oscillation nozzle 10-6-1, the circular port of high 0.5~60mm, diameter 1~24mm, high 0.35~48mm self-oscillation chamber, diameter 0.25~6mm, the circular port of high 5~48mm, 0~30 ° of tapering, the truncated cone-shaped hole of high 0.5~48mm and diameter 0.5~8mm, the manhole of high 0.5~48mm; Dividing plate 10-3 is the cylinder of high 2~10mm, is evenly distributed with the through hole of 5~21 diameter 5~10mm in it, and fixedlys connected with valve body 10-6 front end; Pressurize nonreturn valve core 10-4 is the smooth surface spheroid of a diameter 6~12mm, and activity is positioned at the unidirectional valve pocket of pressurize, and when 10 work of this drill bit, pressurize nonreturn valve core 10-4 is because pressure reduction is pushed to the valve position of opening of dividing plate 10-3, and the high pressure heterogeneous fluid passes through; When the high pressure heterogeneous fluid release in the drilling rod, pressurize nonreturn valve core 10-4 is because the reverse locking of pressure reduction makes this drill bit top be in high pressure conditions all the time; It is the spheroid that there are two cannelures that intersect vertically mutually on a diameter 6~12mm and surface that spool 10-5 is switched in axle/radial jet, this annular groove depth 0.5~4mm, wide 0.5~4mm, when drill bit carries out radially grooving, this spool is inserted axle/radial jet switch valve pocket, during work, spool 10-5 both sides pressure reduction is switched in axle/radial jet makes its locking, and two cannelures that intersect vertically mutually of axle/radial jet switching spool 10-5 guarantee that drill bit radial oscillation nozzle 10-6-1 and axial oscillation nozzle 10-2-1 have High-Pressure Water simultaneously; At the bottom of drilling rod 9 connecting holes, processed the second seal groove 9-1 and in the sealing groove, seal washer has been installed.
The present invention realizes goal of the invention like this: in the boring procedure, the polyphase oscillation jet crushing coal petrography that axial oscillation nozzle on the drill bit produces, creep into pilot hole, cutting tool on the cut drill further grinds cinder and pilot hole is enlarged, compare with former technology, weakened the stressed of cut drill, improved the life-span of cut drill, water itself has cooling effect in addition, fundamentally solved the too high and accident that causes of temperature of diamond bit, needed moment of torsion of drilling process and thrust reduce significantly, the load of drilling equipment reduces greatly, helps being drilled to more deep hole, makes boring keep straight, cause the big problem of drill hole density owing to drilling depth is shallow in the time of can effectively solving the boring of employing air drill, improved the work efficiency of boring.Begin rollback when holing to prescribed depth, switch by axle/radial jet, the polyphase oscillation jet that is produced by the radial oscillation nozzle carries out radially grooving again.Because in boring, grooving process, cinder is to get rid of boring with the form of tiny coal grain and water, this has just improved the smoothness of deslagging, and has played the effect of depositing dust, has improved the operating environment of job site simultaneously.The accurate hydrostatic pressure that the polyphase oscillation jet produces in boring supports hole wall, realize the effect of solid hole, dynamic effects such as the impact of polyphase oscillation jet, vibration, cavitation erosion bring out the stress in coal bed field and the field, crack dynamically develops, make coal body crack rate increase, gas permeability of coal seam increases, promote the adsorption gas fast resolving to be free gas simultaneously, thereby improved the gas drainage under suction amount.
The following technique effect that the present invention has:
1, compared with prior art, the present invention adopts high-pressure hydraulic pump to high-pressure sealed drilling rod and multi-functional drill bit feed flow, water under high pressure forms the polyphase oscillation jet through the self-oscillation abrasive jet of high-pressure sealed drilling rod and multi-functional drill bit, the impact grinding coal petrography, in the hole, be ground into tiny coal grain subsequently under the effect of water and rotary drilling-head by the coal petrography of polyphase oscillation jet crushing and discharge boring with water in the hole, after boring is finished, switch by radial oscillation nozzle and axle/radial jet, the polyphase oscillation jet that is produced by the radial oscillation nozzle carries out radially grooving again.Prolonged the cut drill life-span, improved drilling depth and speed, improved gas permeability of coal seam, avoided bit freezing and prevented drill bit and coal petrography friction has produced high temperature or spark and caused the gas combustion accident.
2, the present invention's test situation of getting through an ore deposit in loose algae mining area shows that compared with prior art, the present invention creeps into mean depth and is: 144m is 2~3 times of existing solid jet technology; Creeping into average speed is: 0.21m/min is 1.5~2 times of existing solid jet technology; The average extraction flow of single hole gas is: 2.1384L/min is 3~5 times of existing solid jet technology, and gas permeability of coal seam is greatly improved.
3, the present invention is applicable to the boring and the grooving of gas discharge in mine, the particularly gas drainage under suction of colliery low air permeability coal seam.
Description of drawings:
Fig. 1 is a method flow diagram of the present invention, and Fig. 2 is apparatus of the present invention schematic diagram,
Fig. 3 is the top plan of Fig. 4, and Fig. 4 is the sectional drawing of the A-A of multi-functional drill bit among Fig. 3
Fig. 5 is the drilling rod axial section, and Fig. 6 is the vertical view of Fig. 7
Fig. 7 is the B-B sectional drawing of cut drill among Fig. 6, and Fig. 8 is the valve body axial section,
Fig. 9 is the enlarged drawing of the vertical view of dividing plate, and Figure 10 is the axial section of Fig. 9 median septum,
Figure 11 is the amplification plan view of pressurize nonreturn valve core, and Figure 12 is the amplification plan view that spool is switched in axle/radial jet.
In Fig. 1 to Figure 12:
1-water tank, 2-high-pressure hydraulic pump, 3-overflow valve
4-stop valve, 5-mixing chamber, 6-stop valve
7-abrasive can, 8-stop valve, 9-drilling rod
10-drill bit, 11-coal seam, 12-rig
13-high-pressure sealed circulator 9-1-seal groove 10-1-cutting tool
10-2-cut drill 10-3-dividing plate 10-4-pressurize nonreturn valve core
Spool 10-6-valve body 10-2-1-axial oscillation nozzle is switched in 10-5-axle/radial jet
10-2-2-auxiliary vibration nozzle 10-6-1-radial oscillation nozzle 10-6-2-seal groove
The unidirectional valve pocket of 10-6-3-pressurize
The specific embodiment:
The present invention gets through in the application in an ore deposit in loose algae mining area, and the method detailed process is as follows:
(1) prepares coal bed gas drainage device condition of work: check the firm and sealing of each connecting line in the polyphase oscillation jet coal bed gas drainage device, high-pressure hydraulic pump is executed apart from the coal seam bored some 3m;
(2) start high-pressure hydraulic pump 2: the working flow of high-pressure hydraulic pump 2 is 50L/min, and operating pressure is 10MPa;
(3) control valve: open stop valve 8 earlier, open stop valve 6 again, after open stop valve 4, after the abrasive material that makes water under high pressure enter mixing chamber 5 and abrasive can through high-pressure water pipe mixes, through high-pressure sealed circulator 13, by drilling rod 9, form the ejection of polyphase oscillation jet again via axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2;
(4) rig advances, holes: cutting of polyphase oscillation jet elder generation and broken coal seam that axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 produce, and in the coal seam, creep into pilot hole, by the cutting tool 10-1 on the cut drill 10-2 will cut, coal grinding after the fragmentation, and pilot hole is expanded into gas extraction hole, grinding the back particle diameter is that 0.1~2mm coal particle is discharged fast with backwater; The quasi static pressure of 1~10Mpa that the polyphase oscillation jet of axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 ejection produces in boring supports the gas extraction hole hole wall; After creeping into 1 drilling rod, close stop valve 4, stop rig and advance, rotate, add drilling rod 9, whenever add a drilling rod 9, repeating step 3,4 successively;
(5) judge whether rig continues to creep into: projected depth then continues to creep into repeating step 3,4 when drilling depth does not reach 144m in advance; When drilling depth reaches 144m, then stop to creep into, close stop valve 4, stop rig and advance, rotate, spool 10-5 is switched in axle/radial jet insert in the valve body 10-6 hole, close axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2;
(6) control valve: when drilling rod whenever moves back 3m, open stop valve 4;
(7) rig rotation, grooving: stop to move back drilling rod, water under high pressure forms the ejection of polyphase oscillation jet by drilling rod 9 through radial oscillation nozzle 10-6-1, and rotary drill rod 9 allows the polyphase oscillation jet radially carry out the ring-type grooving at gas extraction hole, and the grooving time is 20min; After cutting a groove, close stop valve 4, stop rig 12 rotations, continue grooving, whenever cut groove one time, repeating step 6,7 successively;
(8) judge whether rig continues grooving: when the number of grooving does not reach 40, then continue grooving, repeating step 6,7; When the number of grooving reaches 40, then stop grooving, close stop valve 4, stop rig 12 rotations;
(9) whole hole: close high-pressure hydraulic pump;
A kind of coal bed gas drainage device of realizing said method, this device comprises the cutting tool 10-1 and the connecting line of water tank 1, high-pressure hydraulic pump 2, overflow valve 3, stop valve 4, mixing chamber 5, stop valve 6, abrasive can 7, stop valve 8, high-pressure sealed circulator 13, rig 12, drilling rod 9, drill bit 10; It is characterized in that drill bit 10 is multi-functional drill bit, the rear end of this drill bit is threaded with the front end of drilling rod 9, multi-functional drill bit comprises cutting tool 10-1, cut drill 10-2, dividing plate 10-3, pressurize nonreturn valve core 10-4, spool 10-5 and valve body 10-6 are switched in axle/radial jet, cutting tool and the welding of the cut drill front end wing; Cut drill 10-2 profile is a cylinder, on from the wing root end face of cut drill 10-2 to the longitudinal axis the end face thereafter, have successively axial oscillation nozzle 10-2-1 and with this axial oscillation nozzle angle be 3 auxiliary vibration nozzle 10-2-2 that are evenly distributed on the same circumference of 5 °, cylindrical hole and cut drill connecting hole, axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 communicate with cylindrical hole, and cylindrical hole communicates with the cut drill connecting hole; The circular port that diameter 2mm, high 4mm are arranged at the bottom of from the end face of axial oscillation nozzle 10-2-1 and auxiliary vibration nozzle 10-2-2 to the hole of cylindrical hole successively, diameter 4mm, high 3mm self-oscillation chamber, the circular port of diameter 1mm, high 2mm, the truncated cone-shaped hole of 15 ° of taperings, high 2mm and diameter 2mm, the manhole of high 5mm; Valve body 10-6 profile is a cylinder, valve body 10-6 front end is threaded with the cut drill connecting hole, on from the front end face of valve body 10-6 to the longitudinal axis the end face thereafter, diameter 10mm is arranged successively, the unidirectional valve pocket 10-6-3 of the pressurize of high 10mm, diameter 3mm, the cylindrical hole of high 10mm, diameter 10mm, valve pocket, seal groove 10-6-2 and valve body connecting hole are switched in the axle of high 20mm/radial jet; The unidirectional valve pocket of pressurize communicates with cylindrical hole, and cylindrical hole switches valve pocket with axle/radial jet and communicates; On the axle/radial jet transfer valve cavity wall of valve body 10-6 perpendicular to valve body 10-6 longitudinal axis, have 1 radial oscillation nozzle 10-6-1, this nozzle-axis switches at the bottom of the hole of valve pocket 10mm and switches valve pocket with axle/radial jet and communicates apart from axle/radial jet, to axle/radial jet transfer valve cavity wall the circular port of diameter 2mm, high 4mm is arranged successively from the outer end of radial oscillation nozzle 10-6-1, diameter 4mm, high 3mm self-oscillation chamber, the circular port of diameter 1mm, high 2mm, the truncated cone-shaped hole of 15 ° of taperings, high 2mm and diameter 2mm, the manhole of high 5mm; Dividing plate 10-3 is the cylinder of high 2mm, is evenly distributed with the through hole of 19 diameter 5mm in it, and fixedlys connected with valve body 10-6 front end; Pressurize nonreturn valve core 10-4 is the smooth surface spheroid of a diameter 6mm, and activity is positioned at the unidirectional valve pocket of pressurize, and when this drill bit was worked, pressurize nonreturn valve core 10-4 was because pressure reduction is pushed to the valve position of opening of dividing plate 10-3, and the high pressure heterogeneous fluid passes through; When the high pressure heterogeneous fluid release in the drilling rod, pressurize nonreturn valve core 10-4 is because the reverse locking of pressure reduction makes this drill bit top be in high pressure conditions all the time; It is the spheroid that there are two cannelures that intersect vertically mutually on a diameter 6mm and surface that spool 10-5 is switched in axle/radial jet, this annular groove depth 1mm, wide 1mm, when drill bit carries out radially grooving, this spool is inserted axle/radial jet switch valve pocket, spool both sides pressure reduction makes the spool locking during work, and two of the spools cannelure that intersects vertically mutually guarantees that drill bit radial oscillation nozzle and axial oscillation nozzle have High-Pressure Water simultaneously; Processed seal groove 9-1 and in the sealing groove, seal washer has been installed in drilling rod 9 connecting hole bottoms.
The applicable cases that the present invention gets through an ore deposit in loose algae mining area shows, creeps into mean depth to be: 144m is 2~3 times of solid jet technology; Creeping into average speed is: 0.21m/min is 1.5~2 times of solid jet technology; The average extraction flow of single hole gas is: 2.1384L/min is 3~5 times of solid jet technology; Gas permeability of coal seam also is greatly improved.

Claims (2)

1, a kind of coal bed gas drainage method, it is characterized in that this method in the following order step carry out:
(1) start high-pressure hydraulic pump (2): the working flow of high-pressure hydraulic pump (2) is 50~300L/min, and operating pressure is 5~40MPa;
(2) control valve: open first stop valve (8) earlier, open second stop valve (6) again, after open the 3rd stop valve (4), after the abrasive material that makes water under high pressure enter mixing chamber (5) and abrasive can (7) through high-pressure water pipe mixes, through high-pressure sealed circulator (13), by drilling rod (9), form the ejection of polyphase oscillation jet again via axial oscillation nozzle (10-2-1) and auxiliary vibration nozzle (10-2-2);
(3) rig advances, holes: the polyphase oscillation jet that axial oscillation nozzle (10-2-1) and auxiliary vibration nozzle (10-2-2) produce cuts earlier and broken coal seam, and in the coal seam, creep into pilot hole, by the cutting tool (10-1) on the cut drill (10-2) will cut, coal grinding after the fragmentation, and pilot hole is expanded into gas extraction hole, grinding the back particle diameter is that 0.1~5mm coal particle is discharged fast with backwater; The quasi static pressure of 1~10Mpa that the polyphase oscillation jet of axial oscillation nozzle (10-2-1) and auxiliary vibration nozzle (10-2-2) ejection produces in boring supports the gas extraction hole hole wall; After creeping into per 1 drilling rod, close the 3rd stop valve (4), stop that rig advances, rotation, add drilling rod (9), whenever add a drilling rod (9), repeating step (2) successively, (3);
(4) judge whether rig continues to creep into: when drilling depth does not reach 20~300m, then continue to creep into repeating step (2), (3); When drilling depth reaches 20~300m, then stop to creep into, close the 3rd stop valve (4), stop rig and advance, rotate, spool (10-5) is switched in axle/radial jet insert in valve body (10-6) hole, close axial oscillation nozzle (10-2-1) and auxiliary vibration nozzle (10-2-2);
(5) control valve: after stopping to creep into, move back drilling rod (9), drilling rod (9) whenever moves back 0.5~10m, opens the 3rd stop valve (4);
(6) rig rotation, grooving: stop to move back drilling rod, water under high pressure is by drilling rod (9), form the ejection of polyphase oscillation jet through radial oscillation nozzle (10-6-1), rotary drill rod (9) allows the polyphase oscillation jet radially carry out the ring-type grooving in the coal seam along gas extraction hole, and the grooving time is 0.5~20min; After cutting a groove, close the 3rd stop valve (4), stop rig (12) rotation, continue grooving, whenever cut groove one time, repeating step (5) successively, (6);
(7) judge whether rig continues grooving: when the number of grooving does not reach 2~600, then continue grooving, repeating step (5), (6); When the number of grooving reaches 2~600, then stop grooving, close the 3rd stop valve (4), stop rig (12) rotation;
(8) whole hole: close high-pressure hydraulic pump.
2, a kind of coal bed gas drainage device of realizing the described method of claim 1, this device comprises the cutting tool (10-1) and the connecting line of water tank (1), high-pressure hydraulic pump (2), overflow valve (3), the 3rd stop valve (4), mixing chamber (5), second stop valve (6), abrasive can (7), first stop valve (8), high-pressure sealed circulator (13), rig (12), drilling rod (9), drill bit (10); It is characterized in that drill bit (10) is multi-functional drill bit, the front end of the rear end of this drill bit and drilling rod (9) removably connects, multi-functional drill bit comprises cutting tool (10-1), cut drill (10-2), dividing plate (10-3), pressurize nonreturn valve core (10-4), spool (10-5) and valve body (10-6) are switched in axle/radial jet, and cutting tool is fixedlyed connected with the cut drill front end wing; Cut drill (10-2) profile is a cylinder, on from the wing root end face of cut drill (10-2) to the longitudinal axis the end face thereafter, have successively axial oscillation nozzle (10-2-1) and with the longitudinal axis angle of this axial oscillation nozzle be 1~6 auxiliary vibration nozzle (10-2-2) that is evenly distributed on the same circumference of 0~30 °, cylindrical hole and cut drill connecting hole, axial oscillation nozzle (10-2-1) and auxiliary vibration nozzle (10-2-2) communicate with cylindrical hole, and cylindrical hole communicates with the cut drill connecting hole; The circular port that diameter 0.5~8mm, high 0.5~60mm are arranged at the bottom of from the end face of axial oscillation nozzle (10-2-1) and auxiliary vibration nozzle (10-2-2) to the hole of cylindrical hole successively, the self-oscillation chamber of diameter 1~24mm, high 0.35~48mm, the circular port of diameter 0.25~6mm, high 5~48mm, the truncated cone-shaped hole of 0~30 ° of tapering, high 0.5~48mm and diameter 0.5~8mm, the manhole of high 0.5~48mm; Valve body (10-6) profile is a cylinder, valve body (10-6) front end and cut drill connecting hole removably connect, on from the front end face of valve body (10-6) to the longitudinal axis the end face thereafter, diameter 10~16mm is arranged successively, the unidirectional valve pocket of the pressurize of high 10~16mm (10-6-3), diameter 2~11mm, the cylindrical hole of high 10~50mm, diameter 10~30mm, valve pocket, first seal groove (10-6-2) and valve body connecting hole are switched in the axle of high 20~100mm/radial jet; Valve pocket is switched in the unidirectional valve pocket of pressurize, cylindrical hole, axle/radial jet and the valve body connecting hole communicates; On the axle/radial jet transfer valve cavity wall of valve body (10-6) perpendicular to valve body (10-6) longitudinal axis, have 1~4 radial oscillation nozzle (10-6-1), this nozzle-axis switches at the bottom of the hole of valve pocket 10~16mm and switches valve pocket with axle/radial jet and communicates apart from axle/radial jet, to axle/radial jet transfer valve cavity wall diameter 0.5~8mm is arranged successively from the outer end of radial oscillation nozzle (10-6-1), the circular port of high 0.5~60mm, diameter 1~24mm, high 0.35~48mm self-oscillation chamber, diameter 0.25~6mm, the circular port of high 5~48mm, 0~30 ° of tapering, the truncated cone-shaped hole of high 0.5~48mm and diameter 0.5~8mm, the manhole of high 0.5~48mm; Dividing plate (10-3) is the cylinder of high 2~10mm, is evenly distributed with the through hole of 5~21 diameter 5~10mm in it, and fixedlys connected with valve body (10-6) front end; Pressurize nonreturn valve core (10-4) is the smooth surface spheroid of a diameter 6~12mm, activity is positioned at the unidirectional valve pocket of pressurize, when this drill bit (10) was worked, pressurize nonreturn valve core (10-4) was because pressure reduction is pushed to the valve position of opening of dividing plate (10-3), and the high pressure heterogeneous fluid passes through; When the high pressure heterogeneous fluid release in the drilling rod, pressurize nonreturn valve core (10-4) is because the reverse locking of pressure reduction makes this drill bit top be in high pressure conditions all the time; It is the spheroid that there are two cannelures that intersect vertically mutually on a diameter 6~12mm and surface that spool (10-5) is switched in axle/radial jet, this annular groove depth 0.5~4mm, wide 0.5~4mm, when drill bit carries out radially grooving, this spool is inserted axle/radial jet switch valve pocket, during work, spool (10-5) both sides pressure reduction is switched in axle/radial jet makes its locking, and the cannelure that axle/radial jet switching spool (10-5) two intersects vertically mutually guarantees that drill bit radial oscillation nozzle (10-6-1) and axial oscillation nozzle (10-2-1) have High-Pressure Water simultaneously; At the bottom of drilling rod (9) connecting hole, processed second seal groove (9-1) and in the sealing groove, seal washer has been installed.
CNB2007100926734A 2007-09-07 2007-09-07 Coal bed gas drainage method and device CN100485163C (en)

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