CN110388208A - Plasma abatement thick and hard roof and the method for leaving the compound strong mine pressure of coal column - Google Patents
Plasma abatement thick and hard roof and the method for leaving the compound strong mine pressure of coal column Download PDFInfo
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- CN110388208A CN110388208A CN201910642129.5A CN201910642129A CN110388208A CN 110388208 A CN110388208 A CN 110388208A CN 201910642129 A CN201910642129 A CN 201910642129A CN 110388208 A CN110388208 A CN 110388208A
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- 239000003245 coal Substances 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 40
- 150000001875 compounds Chemical class 0.000 title claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 144
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 163
- 239000000523 sample Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 22
- 239000011435 rock Substances 0.000 claims description 13
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- 230000000694 effects Effects 0.000 claims description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
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- 239000011229 interlayer Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000013021 overheating Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 claims 1
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- 238000005065 mining Methods 0.000 description 6
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/18—Other methods or devices for dislodging with or without loading by electricity
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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Abstract
The invention discloses a kind of methods that plasma abatement thick and hard roof and residual exploiting field leave the compound strong mine pressure of coal column.Residual exploiting field leave the ground right above coal column drill through "Formula " drilling well, "Formula " drilling well be divided into "Formula " drilling well vertical section and "Formula " drilling well horizontal segment two parts, "Formula " drilling well vertical section pass through above cover coal seam thick and hard roof and on cover coal seam and reach residual exploiting field of underliing and leave in coal column, "Formula " drilling well horizontal segment covers parallel with advance of the face direction in the thick and hard roof of coal seam upper, then leaves coal column by plasma device fracturing thick and hard roof and residual exploiting field.The present invention makes full use of interionic strong movements moment to generate the characteristic of high temperature, high pressure, drill through on ground "Formula " drilling well, a well double-purpose, formation shock wave makes to cover coal seam thick and hard roof and residual exploiting field leaves coal column and generates crack and extend, and achievees the purpose that cutting down thick and hard roof and residual exploiting field leaves the compound strong mine pressure of coal column, to realize coal mine lasting exploit, keeps the safety in production.
Description
Technical field
The present invention relates to a kind of plasmasFormula abatement thick and hard roof and the method and dress for leaving the compound strong mine pressure of coal column
It sets, belongs to coal mining technology field.
Background technique
So-called Upward mining method first adopts to adopt after underliing coal seam and covers coal seam.When above covering seam mining, layer can be passed through
Between thick and hard roof and residual exploiting field of underliing leave coal column group, influenced coal work by compound strong mine pressure up and down.
Compound strong mine pressure is mainly derived from: (a) thick and hard roof: due to natural geological conditions, covering coal seam on many mining areas
The thick and hard roof that there are thickness is big, intensity is high, joint fissure agensis, integrality are good；(b) coal column is left in residual exploiting field: new China
The coal winning technology in initial stage of founding China falls behind relatively, for the safety in production of the stability, safeguard work face of guarantee country rock, can stay and set
Part pillar overlying rock；In the recovery process of modern high mechanization, by constructing and other mining conditions are limited,
Staying for part coal column is set unavoidably；When using barrier system coal-mining method, part coal column can leave and not adopt.This is resulted in coal seam
After exploitation, residual exploiting field, which has, largely leaves coal column.
When exploitation left by thick and hard roof and residual exploiting field of underliing that the compound strong mine pressure of coal column influences on cover coal seam when, can make
Strong at Face Ground Pressure Behavior, working face wall caving is serious, Floor Heave in Roadway, and goaf top plate is caving acutely and with loud noise, work
Make face poppet pressure to increase obviously, hydraulic support pushed down, the destruction of tunnel individual prop also happen occasionally, and stope thick and hard roof is first
Times/week phase water component also will increase, and gather a large amount of energy, when stope thick and hard roof suddenly across falling when, the energy of accumulation
Will abrupt release come out, to cause violent dynamic impact problem disaster, cause equipment damage, casualties seriously endangers mine
Well safety in production.
The prediction and preventing and controlling that compound strong mine pressure caused by coal column is left in thick and hard roof and residual exploiting field are more difficult, currently
For thick and hard roof and residual exploiting field leave coal column influence on cover the compound strong mine pressure of working face of coal seam control method have: it is a, passive
Control methods: (1) direction of extraction, the arrangement orientation of working face of coal seam adjustment in are covered, so that coal column is left in residual exploiting field of avoiding underliing
The concentrated stress zone of influence, but working face is still influenced by thick and hard roof pressure, is not tackled the problem at its root；(2) in reinforcement
The supporting of working face of coal seam is covered, but when Face Ground Pressure Behavior is strong, is difficult to by the technical measures of simple strengthening supporting
Guarantee safety in production, and support cost is high；(3) coal seam is covered on being left that coal column influenced by thick and hard roof and residual exploiting field to work
Face is also stayed and sets bigger coal column, but causes the significant wastage of coal resources；B, active control: (1) in thick and hard roof and residual
Exploiting field is left and carries out explosion in coal column, but construction work amount is big, poor controllability, is easy to cause gas particularly with highly gassy mine
Explosion, there are security risks；(2) coal column is left using hydrofracturing thick and hard roof and residual exploiting field, but consumes a large amount of water money
Source, and the chemical reagent during fracturing in high pressure fracture liquid is easy pollution subsurface environment.By the control of the above compound strong mine pressure
It is bad that method can be seen that passive control methods effect, does not solve the problems, such as really；Active control job location is mostly in working face
Or in tunnel, coal work is influenced, and fracturing thick and hard roof respectively and residual exploiting field is needed to leave coal column, complex steps.Cause
This, needs to find a kind of high-efficient, easy to control, good abatement thick and hard roof of effect and the compound strong mine pressure of coal column is left in residual exploiting field
Method carrys out the safety in production in safeguard work face.
Plasma state is that one kind is different from solid-state, liquid and gaseous state of aggregation, when certain liquid are excited by outside energy
Liquid phase plasma is generated, the characteristic of high temperature, high pressure is generated using interionic strong movements moment, forming shock wave produces rock mass
Raw crack simultaneously extends.It has been widely used in oil/gas drilling, exploitation at present, and the cutting of metal orients broken sillar.However
The technology of the compound strong mine pressure of plasma abatement technical field of coal exploitation (especially plasma ground "Formula " abatement is thick
Resist plate stubbornly and the compound strong mine pressure aspect of coal column left in residual exploiting field) application it is seldom.
Summary of the invention
The present invention is intended to provide a kind of plasmaFormula abatement thick and hard roof and leave the compound strong mine pressure of coal column method and
Device, it is not only high-efficient, easy to control, effect is good, strong flexibility, it is dustless, without making an uproar, can be to avoid the disadvantage and not of preceding method
Foot, and interionic strong movements moment is made full use of to generate the characteristic of high temperature, high pressure, drill through on ground "Formula " drilling well, one
Well double-purpose, formation shock wave makes to cover coal seam thick and hard roof and residual exploiting field leaves coal column and generates crack and extend, and it is thick to reach abatement
It resists plate stubbornly and the purpose of the compound strong mine pressure of coal column is left in residual exploiting field, to realize coal mine lasting exploit, keep the safety in production.
The process object that the present invention is directed to is: if working seam leaves coal column group by residual exploiting field of underliing and interlayer thickness is resisted stubbornly
Plate, and the coal column that residual exploiting field is left in coal column group is intricate, can select "It is thick to reach abatement from Ground Operation for formula " drilling well
It resists plate stubbornly and leaves the purpose of the compound strong mine pressure of coal column.
The present invention provides a kind of plasmasMethod formula abatement thick and hard roof and leave the compound strong mine pressure of coal column is used
Coal column group and interlayer thick and hard roof and the intricate situation of coal column are left by residual exploiting field of underliing in working seam, including following
Step:
Step 1: by high-tension cable by plasma pulse controller, plasma generator, electrode securing device,
The connection of discharge in water plasma electrode；Plasma pulse controller is connect by conducting wire with data collecting instrument；Pass through signal
Transmission line connects data collecting instrument, signal amplifier, demodulation probe；By dual-purpose water pipe by water tank, high-pressure pump, cooling
Device, plasma generator connect to form complete loops, the cooling control valve control switch of plasma generator；Pass through dual-purpose water
Pipe connects high-pressure pump, pressure gauge, high-pressure water nozzle, high-pressure water nozzle control valve control switch；And with ground power supply system phase
Connection；
Step 2: determining ground and above covering coal seam thick and hard roof, position and the distance relation of coal column are left in residual exploiting field of underliing,
Residual exploiting field leave the ground right above coal column drill through "Formula " drilling well, "Formula " drilling well number is L/d, and L is above to cover coal seam work
Make face length, d is wells spacing；"Formula " drilling well be divided into "Formula " drilling well vertical section and "Formula " drilling well horizontal segment two parts, "
Formula " drilling well vertical section pass through above cover coal seam thick and hard roof and on cover coal seam and reach residual exploiting field of underliing and leave in coal column, "Formula " drilling well
Horizontal segment it is upper cover it is parallel with advance of the face direction in the thick and hard roof of coal seam, and the intersection of vertical section and horizontal segment pacify
Equipped with directive wheel, first "Formula " drilling well be known as "Formula " plasma fracturing drilling well, second "Formula " drilling well be known as "
Formula " detection drilling well；
Step 3: by dual-purpose water pipe, high-pressure water nozzle, high-tension cable, electrode securing device, discharge in water plasma electricity
Pole passes through residual exploiting field and leaves the drilling well packer of top plate above coal column, and be arranged in that second step drills through "Formula " plasma-induced
The depths of drilling well vertical section is split, and make "The drilling well packer inflation of formula " plasma fracturing drilling well vertical section is shunt in a well, and is believed simultaneously
Number transmission line, demodulation probe be arranged in that second step drills through "The bosom of formula " detection drilling well vertical section；
Step 4: opening high-pressure water nozzle control valve, the water in water tank is by dual-purpose water pipe through high-pressure pump, high pressure water jets
Head injection "In formula " plasma fracturing drilling well vertical section, observed by pressure gauge, when water full of "Formula " plasma fracturing
When inside drilling well vertical section, high-pressure water nozzle control valve is closed；
Step 5: opening plasma generator, alternating current is firm by plasma generator, high-tension cable, electrode
After device, the electric discharge of discharge in water plasma electrode, electric energy is rapidly converted into impact energy, water-filled "Formula " plasma-induced
The pressure split in drilling well vertical section increases sharply, and the original crack for making residual exploiting field leave coal column starts to extend and generate new split
Gap；Demodulation probe receives the signal of discharge in water plasma electrode sending simultaneously, is amplified by signal transmssion line and signal
Device passes to data collecting instrument, and analyzes the reflection configuration delay time spread spectrum scenarios received, leaves coal column to residual exploiting field and splits
Gap developmental state is analyzed, and operates plasma pulse controller so as to adjust discharge frequency, until "Formula " plasma-induced
The coal column of leaving split around drilling well vertical section realizes fracturing；Close plasma generator；
Step 6: by high-tension cable, electrode securing device, discharge in water plasma electrode and dual-purpose water pipe, high pressure spray
Head be arranged in through directive wheel "In front of the drilling well packer of the flat section initial position of formula " plasma fracturing Drilling Water, and make "
The drilling well packer inflation of the flat section of formula " plasma fracturing Drilling Water is shunt in a well, synchronous signal transmission line, demodulation probe pass through "
Formula " detection drilling well vertical section be arranged in through directive wheel "The initial position of formula " detection drilling well horizontal segment repeats the 4th step and the 5th
Step, until "Thick and hard roof around the flat section of formula " plasma fracturing Drilling Water realizes fracturing；Close plasma generator；
Step 7: recycling high-tension cable, electrode securing device, discharge in water plasma electrode and dual-purpose water pipe, high pressure
Fountain head and demodulation probe, then the cooling control valve of open plasma generator, the water of water tank are passed through by dual-purpose water pipe
High-pressure pump, cooler, plasma generator return to water tank, after plasma generator cools down, close etc.
Plasma generator cools down control valve, finally block "Formula " plasma fracturing drilling well；
Step 8: will "Formula " detection drilling well as it is next "Formula " plasma fracturing drilling well, adjacent non-presplitting "
Formula " drilling well as it is next "Formula " detection drilling well repeats third step to the 7th step, until second step drill through it is all "Formula "
Thick and hard roof and residual exploiting field near drilling well leave the completion of coal column whole fracturing.
In above method second step, "The spacing d of formula " drilling well is 6~10 meters；"The diameter d of formula " drilling welloFor 155mm~
335mm。
In above method second step, "The vertical section of formula " drilling well and the angle a range on ground are at 75 °~90 °.
In above method second step, "Formula " drilling well level section is located at the intersection of thick and hard roof and overlying rock.
In above method third step, the operating pressure of drilling well packer is 30MPa~55MPa.
In above method third step, drilling well packer is one of self-sealing, compression or combination type well drilling packer.
In the 4th step of the above method, water-filling "Electrolyte solution is added in formula " plasma fracturing drilling well vertical section, institute
Stating electrolyte solution includes NaOH solution.
In the 5th step of the above method, discharge in water plasma electrode discharge voltage is 100kV~220kV, discharge frequency
For 100Hz~600Hz.
In the 6th step of the above method, drilling well packer is located at 5~10 meters in front of directive wheel of plasma fracturing Drilling Water
In flat section.
The present invention provides a kind of plasmasFormula abatement thick and hard roof and the device for leaving the compound strong mine pressure of coal column, are used
In the implementation above method, including plasma generator, plasma pulse controller, high-tension cable, electrode securing device, liquid
Phase discharge plasma electrode, data collecting instrument, signal amplifier, signal transmssion line, demodulation probe, water tank, high-pressure pump are cold
But device, pressure gauge, dual-purpose water pipe, high-pressure water nozzle, the cooling control valve of plasma generator, high-pressure water nozzle control valve；
Plasma pulse controller, plasma generator, electrode securing device, discharge in water plasma electrode are logical
Cross high-tension cable connection；Electric energy is passed through high-tension cable, electrode securing device, discharge in water plasma by plasma generator
Electrode is discharged, and medium and high voltage cable is responsible for transmitting electric energy, and electrode securing device guarantees discharge in water plasma
The normal work of electrode；
Plasma pulse controller, data collecting instrument, signal amplifier, demodulation probe pass sequentially through signal transmssion line company
It connects；Demodulation probe is responsible for receiving across coal/rock mass waveform signal, and Wave data is transferred to signal by signal transmssion line
Amplifier after Wave data is amplified processing by signal amplifier, is finally transferred to data collecting instrument, and data collecting instrument is incited somebody to action
To Wave data analyzed, judge coal/rock mass fracturing effect；
Water tank, high-pressure pump, cooler, plasma generator connect to form complete loops by dual-purpose water pipe, pass through
Plasma generator cools down control valve T1Control switch；High-pressure pump is cold through cooler again by dual-purpose water pipe by the water of water tank
But after, it is transported to plasma generator, plasma generator cools down, and avoid plasma generator from overheating, and
It is not available；High-pressure pump, pressure gauge, high-pressure water nozzle are connected by dual-purpose water pipe, pass through high-pressure water nozzle control valve T2Control
Switch；The water of water tank is transported to high-pressure water nozzle by dual-purpose water pipe by high-pressure pump, is sprayed finally by high-pressure water nozzle.
Beneficial effects of the present invention:
The present invention makes full use of interionic strong movements moment to generate the characteristic of high temperature, high pressure, and forming shock wave makes rock
Body generates crack and simultaneously extends, drill through on ground "Formula " drilling well, a well double-purpose, to underliing coal seam thick and hard roof and residual exploiting field is left
Coal column carries out presplitting, is not limited by a space, not under the influence of coal seam coal work, it is easy to operate, method is simple, it is dustless, without making an uproar.And
And plasma ground "The method that the compound strong mine pressure of coal column is left in formula " abatement thick and hard roof and residual exploiting field is high-efficient, easily-controllable
System, effect is good, strong flexibility, reduces thick and hard roof and leaves the integrality of coal column, reaches abatement thick and hard roof and residual exploiting field
The purpose for leaving the compound strong mine pressure of coal column leaves the method phase of the compound strong mine pressure of coal column with existing abatement thick and hard roof and residual exploiting field
Than being the transformation of a kind of " extensive style " to " fine formula ", coal mine lasting exploit is realized, is kept the safety in production.
Detailed description of the invention
Fig. 1 be plasma ground "The device that the compound strong mine pressure of coal column is left in formula " abatement thick and hard roof and residual exploiting field shows
It is intended to；
Fig. 2 be plasma ground "Formula " abatement thick and hard roof and residual exploiting field leave the compound strong mine pressure of coal column "Formula "
Plasma fracturing spudder makees state section schematic diagram；
Fig. 3 be plasma ground "Formula " abatement thick and hard roof and residual exploiting field leave the compound strong mine pressure of coal column "Formula "
Detection drilling well working condition section schematic diagram；
Fig. 4 plasma ground "Formula " abatement thick and hard roof and residual exploiting field leave the compound strong mine pressure of coal column "Formula " is bored
Well arranges stereoscopic schematic diagram.
In figure: 1-plasma generator；2-plasma pulse controllers；3-high-tension cables；4-electrodes are firm
Device；5-discharge in water plasma electrodes；6-data collecting instruments；7-signal amplifiers；8-signal transmssion lines；9-inspections
Wave probe；10-water tanks；11-high-pressure pumps；12-coolers；13-pressure gauges；14-dual-purpose water pipes；15-high pressure water jets
Head；16-conducting wires；17-drilling well packers；18-directive wheels；19—"Formula " plasma fracturing drilling well；191—"Formula " etc.
Gas ions fracturing drilling well vertical section；192—"The flat section of formula " plasma fracturing Drilling Water；20—"Formula " detection drilling well；
201—“Formula " detection drilling well vertical section；202—"Formula " detection drilling well horizontal segment；21-above cover coal seam；It loses in 22-residual exploiting fields
Stay coal column；23-above cover coal seam thick and hard roof；24-ground；25—"Formula " drilling well；25a—"Formula " drilling well vertical section；
25b—“Formula " drilling well horizontal segment；D-wells spacing；Do-drilling well diameter；L-above covers working face of coal seam length；T1-wait from
Daughter generator cools down control valve；T2-high-pressure water nozzle control valve.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
Embodiment 1:
As shown in Figure 1, a kind of plasmaFormula abatement thick and hard roof and the device for leaving the compound strong mine pressure of coal column, specifically
Include:
Plasma generator 1, plasma pulse controller 2, high-tension cable 3, electrode securing device 4, discharge in water
Plasma electrode 5, data collecting instrument 6, signal amplifier 7, signal transmssion line 8, demodulation probe 9, water tank 10, high-pressure pump
11, cooler 12, pressure gauge 13, dual-purpose water pipe 14, high-pressure water nozzle 15, the cooling control valve T1 of plasma generator, high pressure
Sprinkler head control valve T2.
Plasma pulse controller, plasma generator, electrode securing device, discharge in water plasma electrode are logical
Cross high-tension cable connection；Electric energy is passed through high-tension cable, electrode securing device, discharge in water plasma by plasma generator
Electrode is discharged, and medium and high voltage cable is responsible for transmitting electric energy, and electrode securing device guarantees discharge in water plasma
The normal work of electrode；
Plasma pulse controller, data collecting instrument, signal amplifier, demodulation probe pass sequentially through signal transmssion line company
It connects；Demodulation probe is responsible for receiving across coal/rock mass waveform signal, and Wave data is transferred to signal by signal transmssion line
Amplifier after Wave data is amplified processing by signal amplifier, is finally transferred to data collecting instrument, and data collecting instrument is incited somebody to action
To Wave data analyzed, judge coal/rock mass fracturing effect；
Water tank, high-pressure pump, cooler, plasma generator connect to form complete loops by dual-purpose water pipe, pass through
Plasma generator cools down control valve T1Control switch；High-pressure pump is cold through cooler again by dual-purpose water pipe by the water of water tank
But after, it is transported to plasma generator, plasma generator cools down, and avoid plasma generator from overheating, and
It is not available；High-pressure pump, pressure gauge, high-pressure water nozzle are connected by dual-purpose water pipe, pass through high-pressure water nozzle control valve T2Control
Switch；The water of water tank is transported to high-pressure water nozzle by dual-purpose water pipe by high-pressure pump, is sprayed finally by high-pressure water nozzle.Institute
The dual-purpose water pipe stated can both play the role of cooling plasma generator；It can also play in the drilling of plasma fracturing
The effect of water filling.
Using above-mentioned apparatus carry out plasma ground "The compound strong mine of coal column is left in formula " abatement thick and hard roof and residual exploiting field
The method of pressure, specifically includes the following steps:
Step 1: plasma generator 1, electrode is firm to be filled by high-tension cable 3 by plasma pulse controller 2
4 are set, discharge in water plasma electrode 5 connects；Plasma pulse controller 2 is connect by conducting wire 16 with data collecting instrument 6；
By signal transmssion line 8 by data collecting instrument 6, signal amplifier 7, demodulation probe 9 is connected；By dual-purpose water pipe 14 by water tank
10, high-pressure pump 11, cooler 12, plasma generator 1, which connects, forms complete loops, the cooling control valve of plasma generator
Control switch；By dual-purpose water pipe 14 by high-pressure pump 11, pressure gauge 13, high-pressure water nozzle 15 is connected, high-pressure water nozzle control valve
Control switch；And it is connected with ground power supply system；
Step 2: determine ground 24 and above cover coal seam thick and hard roof 23, residual exploiting field of underliing leave coal column 22 position and away from
From relationship, residual exploiting field leave the ground 24 right above coal column 22 drill through "Formula " drilling well 25, "25 numbers of formula " drilling well are L/d
A (L is above to cover working face of coal seam length, and d is wells spacing), "The spacing d of formula " drilling well 25 is 8 meters；"Formula " drilling well 25
It is 285mm that diameter, which is do, "Formula " drilling well 25 divide for "Formula " drilling well vertical section 25a and "Formula " drilling well horizontal segment 25b two parts,
“Formula " the drilling well vertical section 25a and angle a on ground is 90 °, "Formula " drilling well vertical section 25a, which is passed through, above covers coal seam thick and hard roof
23 and on cover coal seam 21 and reach residual exploiting field of underliing and leave in coal column 22, "Formula " drilling well horizontal segment 25b, which is located at, above to be covered coal seam thickness and resists stubbornly
The intersection of plate 23 and overlying rock, it is parallel with 21 advance of the face direction of coal seam is above covered, and "Formula " drilling well vertical section
25a and "The intersection of formula " drilling well horizontal segment 25b is equipped with directive wheel 18, first "Formula " drilling well 25 be known as "Formula " etc. from
Daughter fracturing drilling well 19, second "Formula " drilling well 25 be known as "Formula " detection drilling well 20；
Step 3: by dual-purpose water pipe 14, high-pressure water nozzle 15, high-tension cable 3, electrode securing device 4, discharge in water etc. from
Daughter electrode 5 passes through residual exploiting field and leaves the drilling well packer 17 of 23 top top plate of coal column, and be arranged in that second step drills through "Formula "
The depths of plasma fracturing drilling well vertical section 191, and make "The drilling well of formula " plasma fracturing drilling well vertical section 191 insulates
The expansion shut-in well of device 17 (operating pressure 40Mpa~50Mpa), synchronous signal transmission line 8, demodulation probe 9 are arranged in second step and drill through
"The bosom of formula " detection drilling well vertical section 201；
Step 4: opening high-pressure water nozzle control valve, the water in water tank 10 is by dual-purpose water pipe 14 through high-pressure pump 11, height
The injection of pressure sprinkler head 15 "In formula " plasma fracturing drilling well vertical section 191, observed by pressure gauge 13, when water full of "Formula "
When plasma fracturing drilling well 191 inside of vertical section, high-pressure water nozzle control valve is closed；
Step 5: open plasma generator 1,180KV/320Hz pass through plasma generator 1, high-tension cable 3,
After electrode 4-discharge in water of securing device plasma electrode 5 discharges, electric energy is rapidly converted into impact energy, water-filled "Formula "
Pressure in plasma fracturing drilling well vertical section 191 increases sharply, and the original crack for making residual exploiting field leave coal column 22 starts to expand
It opens up and generates new crack；Demodulation probe 9 receives the signal of the sending of discharge in water plasma electrode 5 simultaneously, passes through signal
Transmission line 8, signal amplifier 7 passes to data collecting instrument 6, and analyzes the reflection configuration delay time spread spectrum scenarios received, right
The fractured situation that coal column 22 is left in residual exploiting field is analyzed, and operates plasma pulse controller 2 so as to adjust electric discharge frequency
Rate (100Hz~600Hz), until "Leave the realization of coal column 22 in residual exploiting field around formula " plasma fracturing drilling well vertical section 191
Fracturing；
Step 6: plasma generator 1 is closed, by high-tension cable 3-electrode securing device 4-discharge in water plasma
Body electrode 5 and dual-purpose 14-high pressure spray of water pipe head 15 be arranged in through directive wheel 18 "The flat section of formula " plasma fracturing Drilling Water
17 5 meters of the front of drilling well packer of 192 initial positions, and make "The drilling well packer of the flat section of formula " plasma fracturing Drilling Water
17 expansion shut-in wells, while signal transmssion line 8, demodulation probe 9 being arranged in through directive wheel 18 "Formula " detection drilling well horizontal segment 202
Initial position, repeat the 4th step, the 5th step, until "Coal seam is covered on around the flat section 201 of formula " plasma fracturing Drilling Water
Thick and hard roof 23 realizes fracturing；
Step 7: closing plasma generator 1, high-tension cable 3, electrode securing device 4, discharge in water plasma are recycled
Body electrode 4 and dual-purpose water pipe 14, high pressure spray head 15 and demodulation probe 9, the then cooling control of open plasma generator
Valve, by dual-purpose water pipe 14 through high-pressure pump 11, cooler 12, plasma generator 1 returns to water tank 10 for the water of water tank 10,
After plasma generator 1 cools down, the cooling control valve of plasma generator is closed, finally block "Formula " etc.
Gas ions fracturing drilling well 19；
Step 8: will "Formula " detection drilling well 20 as it is next "Formula " plasma fracturing drilling well 19, adjacent is not pre-
Split "Formula " drilling well as it is next "Formula " detection drilling well 20 repeats third step to the 7th step, until second step drill through it is all "Thick and hard roof 23 and residual exploiting field near formula " drilling well 25 are left the whole fracturings of coal column 22 and are completed；
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in skill of the invention
Within art essence and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of plasma abatement thick and hard roof and the method for leaving the compound strong mine pressure of coal column, it is characterised in that: be used for: exploitation
Coal column group and interlayer thick and hard roof and the intricate situation of coal column are left by residual exploiting field of underliing in coal seam, comprising the following steps:
Step 1: passing through high-tension cable for plasma pulse controller, plasma generator, electrode securing device, liquid phase
The connection of discharge plasma electrode；Plasma pulse controller is connect by conducting wire with data collecting instrument；It is transmitted by signal
Line connects data collecting instrument, signal amplifier, demodulation probe；By dual-purpose water pipe by water tank, high-pressure pump, cooler, etc.
Plasma generator connects to form complete loops, the cooling control valve control switch of plasma generator；It will by dual-purpose water pipe
High-pressure pump, pressure gauge, high-pressure water nozzle connection, high-pressure water nozzle control valve control switch；And it is connected with ground power supply system；
Step 2: determining ground and above covering coal seam thick and hard roof, position and the distance relation of coal column are left in residual exploiting field of underliing, residual
Exploiting field leave the ground right above coal column drill through "Formula " drilling well, "Formula " drilling well number is L/d, and L is above to cover working face of coal seam
Length, d are wells spacing；"Formula " drilling well be divided into "Formula " drilling well vertical section and "Formula " drilling well horizontal segment two parts, "Formula " is bored
Well vertical section pass through above cover coal seam thick and hard roof and on cover coal seam and reach residual exploiting field of underliing and leave in coal column, "Formula " drilling well is horizontal
Section is covered parallel with advance of the face direction in the thick and hard roof of coal seam upper, and is equipped in the intersection of vertical section and horizontal segment
Directive wheel, first "Formula " drilling well be known as "Formula " plasma fracturing drilling well, second "Formula " drilling well be known as "Formula " detection
Drilling well；
Step 3: high-tension cable, electrode securing device, discharge in water plasma electrode are worn by dual-purpose water pipe, high-pressure water nozzle
It crosses residual exploiting field and leaves the drilling well packer of top plate above coal column, and be arranged in that second step drills through "Formula " plasma fracturing is bored
The depths of well vertical section, and make "The drilling well packer inflation of formula " plasma fracturing drilling well vertical section is shunt in a well, and synchronous signal passes
Defeated line, demodulation probe be arranged in that second step drills through "The bosom of formula " detection drilling well vertical section；
Step 4: opening high-pressure water nozzle control valve, the water in water tank by dual-purpose water pipe through high-pressure pump, penetrate by high-pressure water nozzle
Enter "In formula " plasma fracturing drilling well vertical section, observed by pressure gauge, when water full of "Formula " plasma fracturing drilling well
When inside vertical section, high-pressure water nozzle control valve is closed；
Step 5: open plasma generator, alternating current by plasma generator, high-tension cable, electrode securing device,
After the electric discharge of discharge in water plasma electrode, electric energy is rapidly converted into impact energy, water-filled "Formula " plasma fracturing drilling well
Pressure in vertical section increases sharply, and the original crack for making residual exploiting field leave coal column starts to extend and generate new crack；Simultaneously
Demodulation probe receives the signal of discharge in water plasma electrode sending, passes to number by signal transmssion line and signal amplifier
According to Acquisition Instrument, and the reflection configuration delay time spread spectrum scenarios received are analyzed, the cranny development feelings of coal column are left to residual exploiting field
Condition is analyzed, and operates plasma pulse controller so as to adjust discharge frequency, until "Formula " plasma fracturing drilling well is hung down
Coal column of leaving around straight section realizes fracturing；Close plasma generator；
Step 6: by high-tension cable, electrode securing device, discharge in water plasma electrode and dual-purpose water pipe, high pressure spray head
Be arranged in through directive wheel "In front of the drilling well packer of the flat section initial position of formula " plasma fracturing Drilling Water, and make "Formula " etc.
The drilling well packer inflation of gas ions fracturing drilling well horizontal segment is shunt in a well, synchronous signal transmission line, demodulation probe pass through "Formula " detection
Drilling well vertical section be arranged in through directive wheel "The initial position of formula " detection drilling well horizontal segment repeats the 4th step and the 5th step, until
“Thick and hard roof around the flat section of formula " plasma fracturing Drilling Water realizes fracturing；Close plasma generator；
Step 7: recycling high-tension cable, electrode securing device, discharge in water plasma electrode and dual-purpose water pipe, spraying water with high pressure
Head and demodulation probe, then open plasma generator cools down control valve, and the water of water tank is by dual-purpose water pipe through high pressure
Pump, cooler, plasma generator return to water tank, after plasma generator cools down, close plasma
Body generator cools down control valve, finally block "Formula " plasma fracturing drilling well；
Step 8: will "Formula " detection drilling well as it is next "Formula " plasma fracturing drilling well, adjacent non-presplitting "Formula " is bored
Well as it is next "Formula " detection drilling well repeats third step to the 7th step, until second step drill through it is all "Formula " drilling well is attached
The completion of coal column whole fracturing is left in close thick and hard roof and residual exploiting field.
2. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in second step, "The spacing d of formula " drilling well is 6~10 meters；"The diameter d of formula " drilling welloFor 155mm~335mm.
3. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in second step, "The vertical section of formula " drilling well and the angle a range on ground are at 75 °~90 °.
4. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in second step, "Formula " drilling well level section is located at the intersection of thick and hard roof and overlying rock.
5. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in third step, the operating pressure of drilling well packer is 30MPa~55MPa.
6. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in third step, drilling well packer is one of self-sealing, compression or combination type well drilling packer.
7. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in the 4th step, water-filling "Electrolyte solution, the electrolyte is added in formula " plasma fracturing drilling well vertical section
Solution includes NaOH solution.
8. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in the 5th step, discharge in water plasma electrode discharge voltage be 100kV~220kV, discharge frequency be 100Hz~
600Hz。
9. plasma abatement thick and hard roof according to claim 1 and the method for leaving the compound strong mine pressure of coal column, special
Sign is: in the 6th step, drilling well packer is located in front of directive wheel in 5~10 meters of the flat section of plasma fracturing Drilling Water.
10. a kind of plasma abatement thick and hard roof and the device for leaving the compound strong mine pressure of coal column, are wanted for implementing aforesaid right
Seek 1~9 described in any item methods, it is characterised in that: including plasma generator, plasma pulse controller, high pressure
Cable, electrode securing device, discharge in water plasma electrode, data collecting instrument, signal amplifier, signal transmssion line, detection
Probe, water tank, high-pressure pump, cooler, pressure gauge, dual-purpose water pipe, high-pressure water nozzle, the cooling control of plasma generator
Valve, high-pressure water nozzle control valve；
Plasma pulse controller, plasma generator, electrode securing device, discharge in water plasma electrode pass through height
Voltage cable connection；Electric energy is passed through high-tension cable, electrode securing device, discharge in water plasma electrode by plasma generator
It is discharged, medium and high voltage cable is responsible for transmitting electric energy, and electrode securing device guarantees discharge in water plasma electrode
Normal work；
Plasma pulse controller, data collecting instrument, signal amplifier, demodulation probe pass sequentially through signal transmssion line connection；
Demodulation probe is responsible for receiving across coal/rock mass waveform signal, and Wave data is transferred to signal by signal transmssion line and is put
Big device after Wave data is amplified processing by signal amplifier, is finally transferred to data collecting instrument, and data collecting instrument will obtain
Wave data analyzed, judge coal/rock mass fracturing effect；
Water tank, high-pressure pump, cooler, plasma generator connect to form complete loops by dual-purpose water pipe, by it is equal from
Daughter generator cools down control valve T1Control switch；High-pressure pump is cooling through cooler again by dual-purpose water pipe by the water of water tank
Afterwards, it is transported to plasma generator, plasma generator cools down, and avoid plasma generator from overheating, and nothing
Method uses；High-pressure pump, pressure gauge, high-pressure water nozzle are connected by dual-purpose water pipe, pass through high-pressure water nozzle control valve T2Control is opened
It closes；The water of water tank is transported to high-pressure water nozzle by dual-purpose water pipe by high-pressure pump, is sprayed finally by high-pressure water nozzle.
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Cited By (1)
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| CN114320295A (en) * | 2022-01-12 | 2022-04-12 | 辽宁工程技术大学 | Method for preventing rock burst during mining of thick coal seam containing gangue based on electric pulse technology |
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