CN108843320A - Shift to an earlier date outburst elimination method in the tunnel of coal mine tight roof full face - Google Patents
Shift to an earlier date outburst elimination method in the tunnel of coal mine tight roof full face Download PDFInfo
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- CN108843320A CN108843320A CN201810600929.6A CN201810600929A CN108843320A CN 108843320 A CN108843320 A CN 108843320A CN 201810600929 A CN201810600929 A CN 201810600929A CN 108843320 A CN108843320 A CN 108843320A
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- tight roof
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- horizontal segment
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The present invention relates to outburst elimination method is shifted to an earlier date in a kind of tunnel of coal mine tight roof full face, include the following steps：According to the data of site operation early period acquisition and design data drilling parameter and fracturing parameter；In one or both sides tunnel, corresponding working face starting end arranges directional drilling machine, and several saliva horizontal wells are bored to the predeterminated position of top tight roof with certain blowing angle, horizontal segment ends at a certain distance from work surface edges or central axis, the equal barefoot completion of the horizontal segment of each horizontal well；Equipment required for appropriate area arrangement horizontal well fracturing in subsurface tunnel is constructed；Staged fracturing construction is carried out to the naked eye horizontal segment of horizontal well, the tight roof of entire working face is made to be covered with crack, to achieve the purpose that shift to an earlier date extinction in the tunnel of coal mine tight roof full face.This method can integrally manufacture many cracks in the same level of tight roof, destroy the structure of entire face roof, in advance extinction, and overall effect is significant.
Description
Technical field
The invention belongs to coal mining technology fields, and in particular in a kind of tunnel of coal mine tight roof full face in advance
Outburst elimination method.
Background technique
In coal mining, if meeting tight roof, that it will cause rock mass deformations is serious, advanced mine pressure acutely shows and
The disasters such as bump.After tight roof produces in coal seam, just it is caving suddenly when outstanding product of showing up is larger.The 1980s with
Before, some coal mines in China generally use tool pillar mining method management tight roof, after every back production certain distance, stay and set in goaf
The coal column top support plate of certain area.Top plate is not caving during substantially can guaranteeing working face extraction in this way, but
It is the continuous expansion with productive area, the stress of stayed coal column is gradually increased, and destruction is crushed at last, when mined out area reaches
When a certain range, will occurrence of large-area be caving, to cause violent dynamic phenomenon.
Since tight roof is difficult to spontaneous caving, it is promoted to be caving if do not taken appropriate measures, breaking down for the first time
Step pitch can be very big, once being caving, then inbreak area can be very big, will form huge storm, threatens greatly working face, therefore need
Taking appropriate measures is caving it.In face of this major disaster, all various theory and technology measures are actively being taken both at home and abroad
This problem is studied and solves, but the diversity of complexity and productive geological conditions in view of rock mechanics subject itself,
Existing research theory, control technology and engineering problem all need to be further increased and improved.
Currently, carrying out extinction in coal mine roadway is usually taken explosion control top technology and tunnel interior orientation hydraulic fracturing skill
Art, but all there are many defects in practice in both methods.
There are following defects for explosion control top technology：Larger using priming system amount, there are security risks for hauling operation process；Make
A large amount of toxic, pernicious gases are generated with rear, the life security of operating personnel is seriously threatened, increases operating personnel and suffer from the several of occupational disease
Rate；The vibration that overhead caving generates generates destruction to force piece and ground.
Although tunnel interior orientation hydraulic fracturing technology can shift to an earlier date extinction, there are still following defects：In tight roof
Predetermined position footage unpayable is long, needs the off-angle drilling in tunnel；Need the two sides dense well spacing in tunnel working face, drilling cost
It is high；When pressing crack construction, needs to increase orientation grooving process before each pressure break, construction period is caused to extend；Individual well drilling depth is short, can not solve
Certainly working face deep problem can not also solve the problems, such as the extinction of entire working face.
Therefore, it is badly in need of developing in the novel coal mine tight roof full face tunnel of one kind outburst elimination method in advance, this method
It can be carried out before tunnelling, to realize comprehensive Advance presplitting to coal mine tight roof.
Summary of the invention
To solve problems of the prior art, the present invention provides mentions in a kind of tunnel of coal mine tight roof full face
Preceding outburst elimination method, includes the following steps according to sequencing：
Step 1：According to the data of site operation early period acquisition and design data drilling parameter and fracturing parameter；
Step 2：In coal mine side tunnel, corresponding working face starting end arranges directional drilling machine, and uses the directional drilling machine
First horizontal well is bored to the predeterminated position of top tight roof with certain blowing angle, horizontal segment ends at apart from working face side
At a certain distance from edge, second mouthful of water horizontal well is then bored in the same way, until n-th mouthful of water horizontal well, the horizontal segment of each horizontal well
Equal barefoot completion；Or
In coal mine two sides tunnel, corresponding working face starting end arranges directional drilling machine, and using the directional drilling machine in two sides lane
Road respectively bores first horizontal well to the predeterminated position of top tight roof with certain blowing angle respectively, horizontal segment end at away from
At a certain distance from working face central axes, second mouthful of water horizontal well is then respectively bored in the same way, until n-th mouthful of water horizontal well, respectively
The equal barefoot completion of the horizontal segment of horizontal well；
Step 3：Equipment required for appropriate area arrangement horizontal well fracturing in subsurface tunnel is constructed；
Step 4：Staged fracturing construction is carried out to the naked eye horizontal segment of horizontal well, makes the tight roof cloth of entire working face
Full crack, to achieve the purpose that shift to an earlier date extinction in the tunnel of coal mine tight roof full face.
Full face of the invention, which refers to, is divided into several small working faces, each small work for entire coal mining coal seam
The size in face is usually 300 meters of width or so, 3000-5000 meters of length, makes entire small working face by means of the present invention
Tight roof is covered with crack, and coal mine tight roof full face extinction problem can be solved, other small working faces can be used
Same method processing.
In design level well drilling well, not only to consider the geologic feature of coal mine and the driving factor of working face, also to examine
Distribution situation of the tripping in and fracturing fracture of tool string in working face tight roof when considering later period staged fracturing, these factors are total
With structure and the track for determining horizontal well.
If the drilling duty of directional drilling machine is sufficient or working face is when only side tunnel can arrange drilling machine, in working face one
Working face drilling well is directly run through with certain blowing angle aperture in side tunnel；If working face two sides have tunnel that can arrange drilling machine,
Then, until running through working face drilling well, individual well can be effectively reduced so with certain blowing angle aperture in working face two sides tunnel
Drilling depth reduces the requirement to drill drilling ability.
Preferably, the angle between the long axis direction of the working face and the minimum principal stress direction of the tight roof
For β, 0 °≤β≤55 °.
In any of the above-described scheme preferably, the long axis direction of the working face is main along the minimum of the tight roof
Stress direction arrangement, i.e. β=0 °.
In any of the above-described scheme preferably, the folder between the naked eye horizontal segment and the long axis direction of the working face
Angle is θ, 0 °≤θ≤10 °.
In any of the above-described scheme preferably, the naked eye horizontal segment along the tight roof minimum principal stress side
To arrangement, i.e. θ=0 °.
Using technical solution of the present invention, usually requires that 0 °≤β≤55 ° and 0 °≤θ≤10 °, just can ensure that naked eye in this way
0 °≤γ≤45 ° of a low-angle are presented between horizontal segment and the minimum principal stress direction of tight roof.Preferred technical solution
It is β=0 °, θ=0 °, γ=0 °.The minimum principal stress direction of tight roof depend on rock layer mechanics situation, can by sampling and
Lab analysis obtains.
In any of the above-described scheme preferably, it is corresponded in coal mine side tunnel and arranges that the quantity of horizontal well is answered on working face
Meet following relationship：
In formula, the quantity of n --- horizontal well, n takes the integer more than or equal to 1；
The length of L --- working face, m；
L' --- spacing of the adjacent two mouthfuls of water horizontal wells along roadway direction, m.
In any of the above-described scheme preferably, the distance between adjacent two mouthfuls of water horizontal wells should meet following relationship：D=
2 λ=L'cos θ
In formula, d --- the distance between adjacent two mouthfuls of water horizontal wells, m；
The seam of λ --- pressing crack construction is long, m；
L' --- spacing of the adjacent two mouthfuls of water horizontal wells along roadway direction, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
In any of the above-described scheme preferably, the naked eye horizontal segment is located at the predeterminated position of tight roof, this is default
The determination of position should meet following relationship：
In formula, h1--- the distance between naked eye horizontal segment and coal seam top surface, m；
h2--- the thickness in coal seam, m；
The rock deposit coefficient of volumetric expansion of K --- tight roof, coefficient range 1.15-1.25；
According to the lithology difference of tight roof by h1It is divided into several substratums, i.e. h11、h12.......h1n, each substratum collapses
The corresponding rock deposit coefficient of volumetric expansion is K after collapsing1、K2........Kn。
In any of the above-described scheme preferably, the terminal of the naked eye horizontal segment should meet at a distance from work surface edges
Following relationship：
In formula, d' --- the terminal of naked eye horizontal segment is at a distance from work surface edges, m；
The seam of λ --- pressing crack construction is long, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
In any of the above-described scheme preferably, the seam length of the pressing crack construction should meet following relationship：
In formula, the seam of λ --- pressing crack construction is long, m；
The width of W --- working face, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
In any of the above-described scheme preferably, the maximum rate of over-all angle change of the horizontal well inclination section should meet with ShiShimonoseki
It is formula：
In formula, the maximum rate of over-all angle change of k --- inclination section, rad/m；
D --- the borehole diameter of naked eye horizontal segment, mm；
The maximum rigid body outer diameter of d --- fracturing tool string, mm；
L --- the length of fracturing tool string, mm；
Lc--- the deflection of fracturing tool string, mm；
δ --- safety coefficient.
In any of the above-described scheme preferably, should expire between the length and the blowing angle of the horizontal well inclination section
Sufficient following relationship：(naked eye horizontal segment and working face are not accounted for
Angle)
In formula, α --- blowing angle, °；
W1--- the length of inclination section, m；
D --- the borehole diameter of naked eye horizontal segment, mm；
The maximum rigid body outer diameter of d --- fracturing tool string, mm；
L --- the length of fracturing tool string, mm；
Lc--- the deflection of fracturing tool string, mm；
δ --- safety coefficient.
In any of the above-described scheme preferably, the length of the naked eye horizontal segment should meet following relationship：(angle for considering naked eye horizontal segment and working face)
In formula, W2--- the length of naked eye horizontal segment, m；
W1--- inclination section be parallel to working face projected length in the plane, m；
The width of W --- working face, m；
The seam of λ --- pressing crack construction is long, mm；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
In any of the above-described scheme preferably, the staged fracturing method of the naked eye horizontal segment is double envelope single deck tape-recorder segmentation pressures
It splits or water-jet staged fracturing or pitching sliding sleeve staged fracturing.
(1) double envelope single deck tape-recorder staged fracturings：What the fracturing process was implemented is mainly characterized in that " double envelope single deck tape-recorders ", i.e., two double packings
Device, card seal an independent fracturing section.Fracturing string：Oil pipe+safety joint+centralizer+hydraulic packer+opened by pressure sliding sleeve+
Hydraulic packer+centralizer+guide shoe, first pressure break horizontal segment bosom drag tubing string to opened by pressure after completing first segment pressure break
Sliding sleeve is directed at the second fracturing section, and pressure break second segment, so circulation complete N sections of pressure breaks.
(2) water-jet staged fracturing：What the fracturing process was implemented is mainly characterized in that " water-jet ", that is, uses water-jet
Head generates high-velocity fluid and penetrates rock formation eyelet, and subsequent annulus water injection fluid infusion, fluid is generated in eyelet bottom is higher than rupture pressure
The pressure of power extends hydraulic fracture.Fracturing string：Oil pipe+safety joint+hydraulic ejector+hydraulic packer+centralizer+draws
Shoes, first pressure break horizontal segment bosom, dragging tubing string to hydraulic ejector is directed at the second fracturing section, pressure break after completing first segment pressure break
Second segment, so circulation complete N sections of pressure breaks.
(3) pitching sliding sleeve staged fracturing：What the fracturing process was implemented is mainly characterized in that " pitching sliding sleeve ", " fixed tubular column ",
Merge into one-trip string tripping in together with completion tubular column and fracturing string, using hanging packer, expanding open hole packer,
The tools G.I.Hs such as pitching sliding sleeve, pressure difference sliding sleeve and setting ball seat.Fracturing string：Hanging packer+open hole packer N+
Pitching sliding sleeve N+ separating tube+open hole packer N-1+ pitching sliding sleeve N-1+ separating tube ...+II+pitching of open hole packer sliding sleeve II
+ separating tube+I+separating tube of open hole packer I+pressure difference sliding sleeve+ball seat+guide shoe insulates horizontal segment, pressure break using open hole packer
When pitching realize fracturing work well section laterally selective staged isolation, complete first segment to N sections of pressure breaks, to realize full well section
Complete fracturing work.
In any of the above-described scheme preferably, the method using double envelope single deck tape-recorder staged fracturings divides naked eye horizontal segment
Section pressure break, includes the following steps according to sequencing：
Step 1.1：The naked of first horizontal well is pushed to using the fracturing string that drilling machine prepares group in coal mine roadway
In eye horizontal segment, until opened by pressure sliding sleeve is directed at the first fracturing section；
Step 1.2：Fracturing pump in tunnel is connected on oil pipe, fracturing pump is opened and is injected without sand fracturing fluid, oil is worked as
When pressure in pipe rises to 2-3MPa, two hydraulic packers are setting, when the pressure in oil pipe rises to 5-8MPa, sliding sleeve
It opens, fracturing pump continues to inject without sand fracturing fluid into fracturing string with the first fracturing section of pressure break；
Step 1.3：Pressure in oil pipe rises rapidly, and reaches pressure required for tight roof ruptures, then the row of maintenance
Pressure vee crack is measured, until pressure declines suddenly, when observing the pressure trend of fracturing pump and no longer changing, the first pressure can be completed
Split the pressure break of section；
Step 1.4：Slowly bleeding off pressure pressure to oil pipe is 0MPa, and drilling machine drag fracturing tubing string to the is used in tunnel
Two fracturing sections make opened by pressure sliding sleeve be directed at the second fracturing section；
Step 1.5：Step 1.2 is repeated to step 1.3, the pressure break of the second fracturing section can be completed；
Step 1.6：Repeat step 1.4 to step 1.5 several times after, the pressure break of N fracturing section can be completed；
Step 1.7：The pressure slowly bled off pressure to oil pipe is 0MPa, rises by fracturing string using drilling machine in tunnel,
The staged fracturing of first horizontal well can be completed；
Step 1.8：Repeat step 1.1 to step 1.7 several times after, can be completed entire working face double envelope single deck tape-recorders segmentation
Pressure break.
In any of the above-described scheme preferably, naked eye horizontal segment is divided using the method for water-jet staged fracturing
Section pressure break, includes the following steps according to sequencing：
Step 2.1：It is pushed in naked eye horizontal segment in coal mine roadway using the fracturing string that drilling machine prepares group, until
Hydraulic ejector is directed at the first fracturing section；
Step 2.2：Fracturing pump in tunnel is connected on oil pipe, fracturing pump is opened and injects fracturing fluid containing sand, works as oil
When pressure in pipe rises to 2-3MPa, hydraulic packer is setting, when the pressure in oil pipe rises to 5-8MPa, opens waterpower
Injector simultaneously sprays fracturing fluid containing sand, and when the pressure in oil pipe rises to 40-45MPa, hydraulic ejector starts perforation, simultaneously
Into annular space, injection is without sand fracturing fluid with the first fracturing section of pressure break；
Step 2.3：Pressure in oil pipe rises rapidly, and reaches pressure required for tight roof ruptures, then the row of maintenance
Pressure vee crack is measured, until pressure declines suddenly, when observing the pressure trend of fracturing pump and no longer changing, the first pressure can be completed
Split the pressure break of section；
Step 2.4：Slowly bleeding off pressure pressure to oil pipe is 0MPa, and drilling machine drag fracturing tubing string to the is used in tunnel
Two fracturing sections make hydraulic ejector be directed at the second fracturing section；
Step 2.5：Step 2.2 is repeated to step 2.3, the pressure break of the second fracturing section can be completed；
Step 2.6：Repeat step 2.4 to step 2.5 several times after, the pressure break of N fracturing section can be completed；
Step 2.7：The pressure slowly bled off pressure to oil pipe is 0MPa, rises by fracturing string using drilling machine in tunnel,
The staged fracturing of first horizontal well can be completed；
Step 2.8：Repeat step 2.1 to step 2.7 several times after, can be completed entire working face water-jet segmentation
Pressure break.
In any of the above-described scheme preferably, the method using pitching sliding sleeve staged fracturing divides naked eye horizontal segment
Section pressure break, includes the following steps according to sequencing：
Step 3.1：It is pushed in naked eye horizontal segment in tunnel using the fracturing string that drilling machine prepares group, until pressure difference
Sliding sleeve I is directed at the first fracturing section；
Step 3.2：Ball I is launched in fracturing string；Fracturing pump in tunnel is connected on fracturing string, pressure break is opened
No sand fracturing fluid is pumped and injected, is pushed in ball I to ball seat；Slowly boost to the pressure of open hole packer setting, steady pressure
5min, then setting all open hole packers；
Step 3.3：Continue pressure required for boosting to starting differential pressure sliding sleeve I, opens pressure difference sliding sleeve I；Fracturing pump continues
Into fracturing string, injection is without sand fracturing fluid with the first fracturing section of pressure break；
Step 3.4：Pressure in oil pipe rises rapidly, and reaches pressure required for tight roof ruptures, then the row of maintenance
Pressure vee crack is measured, until pressure declines suddenly, when observing the pressure trend of fracturing pump and no longer changing, the first pressure can be completed
Split the pressure break of section；
Step 3.5：Ball II is launched in fracturing string, it is sliding into pitching to push ball II without sand fracturing fluid for fracturing pump injection
In set II；
Step 3.6：Step 3.4 is repeated, the pressure break of the second fracturing section can be completed；
Step 3.7：Repeat step 3.5 to step 3.6 several times after, the pressure break of N fracturing section can be completed；
Step 3.8：The pressure slowly bled off pressure to oil pipe is 0MPa, rises by fracturing string using drilling machine in tunnel,
The staged fracturing of first horizontal well can be completed；
Step 3.9：Repeat step 3.1 to step 3.8 several times after, can be completed entire working face pitching sliding sleeve segmentation
Pressure break.
Horizontal well fracturing construction site needs reasonable Arrangement, and required fracturing unit is arranged in tunnel, construction
It include water pot, fracturing pump, accumulator, pressure sensor, flow sensor, pressure flow data acquisition dress in site layout project figure
It sets, high-pressure hose, hydraulic control high pressure gate, drilling machine, ESD control device, microseism data processing equipment, microseism inductor, pressure
Split tubing string, open-hole horizontal well.
Fracturing tool：In coal mine open-hole horizontal well, the outer diameter of oil pipe is not more than 60.3mm, and pressure-bearing is not less than 70MPa, is
It adapts to drilling machine in tunnel to use, the length of every oil pipe is not more than 3m.In place for convenience of drilling tool push, all steel pipes on tubing string
With chamfering is set in tool hoop, bottom cooperates semicircle guide shoe, and oil pipe adds centralizer every 20-30m, above and below open hole packer
Connector is machined with centralizer.
Pressure break is equipped：Drilling machine for the tripping in tunnel and acts fracturing string, and the push power and pulling force of drilling machine >=
10t；Fracturing pump uses driven high voltage water injecting pump, bicycle power >=50KW, operating pressure >=70MPa, discharge capacity >=1000L/
min；High-pressure hose, for connecting fracturing pump and oil pipe；105MPa high pressure hydraulic control needle valve, is mounted on the oil pipe of horizontal well well head
Place, is controlled by independent hydraulic station, energy emergency shutdown, safety equipment when being pressure break, be can avoid high-pressure hose explosion and is generated lane
Road and shaft safety problem.
Fracturing fluid is configured using coal mine water or clear water.Using water-jet staged fracturing method, when spraying every section of perforation,
It needs into fracturing fluid plus sand, sand feeding amount is executed according to the lower limit of design sand feeding amount, in the fracture extension stage without adding sand.Using
Double envelope single deck tape-recorder staged fracturings and pitching sliding sleeve staged fracturing method, in entire fracturing process, all without adding sand into fracturing fluid.
The determination principle of fracturing parameter is small displacement, high pressure, it is ensured that seam is long long as far as possible.Fracturing section is drawn
Point, it needs to determine number of fragments according to horizontal segment lithologic character and pressure break scale, to the greatest extent in the case where every section of pressure break scale is certain
Pressure break number of fragments can be can increase.Number of fragments：Pitching sliding sleeve staged fracturing usually divides a fracturing section every 100-150m；
Water-jet staged fracturing and double envelope single deck tape-recorder staged fracturings usually divide a fracturing section every 3-5m.
Optionally fracturing effect is monitored according to production needs.Using passive micro-seismic monitoring method, in coal
Layer arranges receiver, the three-dimensional trend in real-time monitoring crack in tunnel；High pressure water injection pump discharge installs pressure discharge capacity recorder, real
When monitoring frac pressure and discharge capacity.
In coal mine tight roof full face tunnel of the invention shift to an earlier date outburst elimination method, using directional drilling machine in tunnel to
The predeterminated position of coal seam tight roof bores several open-hole horizontal wells, carries out staged fracturing in open-hole horizontal well section, makes entirely to work
Face top plate is covered with crack, to solve the problems, such as the full face extinction of coal mine tight roof, avoids occurring in process of coal mining
Accident eliminates safe hidden trouble.
Technical solution of the present invention can be brought the following benefits：In tunnel, directional drilling machine is crept into upwards, individual well without
It is few to imitate drilling depth；Horizontal segment barefoot completion, it is cost-saved, improve working efficiency；Entire working face all covers；Staged fracturing energy
It is enough that tight roof extinction is completed before coal mining；It is constructed using directional drilling machine, borehole size is big, and fracturing string is easy push-in, tubing string
Design tubing string can be made to be sent into and pull out freely in horizontal well, the success rate of staged fracturing is high, while reducing artificial
Labor intensity；A time fracturing string can realize n times staged fracturing, greatly shortening pressure break period；It can solve working face deep top
Plate extinction problem；Many cracks can be integrally manufactured in top plate same level, destroy the structure of entire face roof, in advance
Extinction, overall effect are significant.
Technical solution of the present invention is suitable for the tight roofs such as coal mine siltstone, carbonate rock, is advanced, economical, reliable
The outstanding problem that ground solves coal mine tight roof provides drilling well and pressure break overall plan.
Detailed description of the invention
Fig. 1 is the preferred embodiment for shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof according to the invention full face
The arrangement schematic diagram of middle horizontal well group；
Fig. 2 is to implement shown in Fig. 1 of outburst elimination method in advance in the tunnel of coal mine tight roof according to the invention full face
The positional diagram of horizontal well group and tight roof in example；
Fig. 3 is to implement shown in Fig. 1 of outburst elimination method in advance in the tunnel of coal mine tight roof according to the invention full face
The well track schematic diagram of individual well in example；
Fig. 4 is to implement shown in Fig. 1 of outburst elimination method in advance in the tunnel of coal mine tight roof according to the invention full face
Horizontal well fracturing construction plan in example；
Fig. 5 is another preferred implementation of outburst elimination method in advance in the tunnel of coal mine tight roof according to the invention full face
The arrangement schematic diagram of horizontal well group in example.
Explanation is marked in figure：1- tight roof, the coal seam 2-, the tunnel 3-, 4- horizontal well, 5- naked eye horizontal segment, 6- water pot, 7-
Fracturing pump, 8- accumulator, 9- pressure sensor, 10- flow sensor, 11- pressure flow data acquisition device, 12- high pressure are soft
Pipe, 13- hydraulic control high pressure gate, 14- drilling machine, 15-ESD control device, 16- microseism data processing equipment, 17- microseism induction
Device, 18- fracturing string.
Specific embodiment
In order to be further understood that summary of the invention of the invention, the present invention is elaborated below in conjunction with specific embodiment.
Embodiment one：
The embodiment for shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof according to the invention full face, according to elder generation
Sequentially include the following steps afterwards：
Step 1：According to the data of site operation early period acquisition and design data drilling parameter and fracturing parameter；Step
Rapid two：In coal mine side tunnel, corresponding working face starting end arranges directional drilling machine, and using the directional drilling machine with certain aperture
Angle bores first horizontal well to the predeterminated position of top tight roof, and horizontal segment ends at apart from work surface edges certain distance
Then second mouthful of water horizontal well is bored at place in the same way, until n-th mouthful of water horizontal well, the equal barefoot completion of the horizontal segment of each horizontal well；
Step 3：Equipment required for appropriate area arrangement horizontal well fracturing in subsurface tunnel is constructed；Step
Rapid four：Staged fracturing construction is carried out to the naked eye horizontal segment of horizontal well, the tight roof of entire working face is made to be covered with crack, thus
Achieve the purpose that shift to an earlier date extinction in the tunnel of coal mine tight roof full face.
In design level well drilling well, not only to consider the geologic feature of coal mine and the driving factor of working face, also to examine
Distribution situation of the tripping in and fracturing fracture of tool string in working face tight roof when considering later period staged fracturing, these factors are total
With structure and the track for determining horizontal well.
Using the technical solution of the present embodiment, usually requires that 0 °≤β≤55 ° and 0 °≤θ≤10 °, just can ensure that so naked
0 °≤γ≤45 ° of a low-angle are presented between eye horizontal segment and the minimum principal stress direction of tight roof.Tight roof is most
Minor principal stress direction depends on rock layer mechanics situation, can be obtained by sampling and lab analysis.Wherein, β is working face long axis side
Angle between tight roof minimum principal stress direction, angle of the θ between naked eye horizontal segment and working face long axis direction,
Angle of the γ between naked eye horizontal segment and tight roof minimum principal stress direction.
In the present embodiment, drilling machine is arranged in the side tunnel of working face, with certain blowing angle aperture, directly runs through work
Make face drilling well.If the drilling duty of directional drilling machine is sufficient, can also be in the side tunnel of working face with certain blowing angle aperture.
It is corresponded in coal mine side tunnel and arranges that the quantity of horizontal well should meet following relationship on working face：
In formula, the quantity of n --- horizontal well, n takes the integer more than or equal to 1；
The length of L --- working face, m；
L' --- spacing of the adjacent two mouthfuls of water horizontal wells along roadway direction, m.
The distance between adjacent two mouthfuls of water horizontal wells should meet following relationship：D=2 λ=L'cos θ
In formula, d --- the distance between adjacent two mouthfuls of water horizontal wells, m；
The seam of λ --- pressing crack construction is long, m；
L' --- spacing of the adjacent two mouthfuls of water horizontal wells along roadway direction, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
The naked eye horizontal segment is located at the predeterminated position of tight roof, and the determination of the predeterminated position should meet following relationship
Formula：
In formula, h1--- the distance between naked eye horizontal segment and coal seam top surface, m；
h2--- the thickness in coal seam, m；
The rock deposit coefficient of volumetric expansion of K --- tight roof, coefficient range 1.15-1.25；
According to the lithology difference of tight roof by h1It is divided into several substratums, i.e. h11、h12.......h1n, each substratum collapses
The corresponding rock deposit coefficient of volumetric expansion is K after collapsing1、K2........Kn。
The terminal of the naked eye horizontal segment should meet following relationship at a distance from work surface edges：Formula
In, d' --- the terminal of naked eye horizontal segment is at a distance from work surface edges, m；
The seam of λ --- pressing crack construction is long, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
The seam length of the pressing crack construction should meet following relationship：
In formula, the seam of λ --- pressing crack construction is long, m；
The width of W --- working face, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
The maximum rate of over-all angle change of the horizontal well inclination section should meet following relationship：
In formula, the maximum rate of over-all angle change of k --- inclination section, rad/m；
D --- the borehole diameter of naked eye horizontal segment, mm；
The maximum rigid body outer diameter of d --- fracturing tool string, mm；
L --- the length of fracturing tool string, mm；
Lc--- the deflection of fracturing tool string, mm；
δ --- safety coefficient.
Following relationship should be met between the length and the blowing angle of the horizontal well inclination section：
(folder of naked eye horizontal segment and working face is not accounted for
Angle)
In formula, α --- blowing angle, °；
W1--- the length of inclination section, m；
D --- the borehole diameter of naked eye horizontal segment, mm；
The maximum rigid body outer diameter of d --- fracturing tool string, mm；
L --- the length of fracturing tool string, mm；
Lc--- the deflection of fracturing tool string, mm；
δ --- safety coefficient.
The length of the naked eye horizontal segment should meet following relationship：(consider naked eye level
The angle of section and working face)
In formula, W2--- the length of naked eye horizontal segment, m；
W1--- inclination section be parallel to working face projected length in the plane, m；
The width of W --- working face, m；
The seam of λ --- pressing crack construction is long, mm；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
In the present embodiment, coal mine working face coal seam buried depth is 300m, is collapsed in mining height 6m, tight roof 50m for difficulty
Siltstone, angle theta=10 ° between naked eye horizontal segment and working face long axis direction, face width 300m, length are
3500m。
As shown in Figure 1-3, tight roof 1 is located at 2 top of coal seam, it is upward with certain blowing angle in coal mine side tunnel 3
The predeterminated position of portion's tight roof 1 bores one group of horizontal well 4, bores 58 mouthfuls of water horizontal wells altogether, and horizontal segment ends at apart from work surface edges
At a certain distance from, the equal barefoot completion of the horizontal segment of each horizontal well.Milling shoe through wash well is used after being drilled, and keeps the borehole wall smooth.
Select big blowing angle as far as possible in tunnel and directional drilling machine ability tolerance band, A is on coal seam at tunnel
Tapping point, B are the starting point of naked eye horizontal segment, and C is the terminal of naked eye horizontal segment, W1It is put down where being parallel to working face for inclination section
Projected length on face, as far as possible diminution W1Length, W2For the length of naked eye horizontal segment.In the present embodiment, h1=30m, h2=
6m, α=20 °, d=60m, W1=160m, W2=200m, L '=25m.
As shown in figure 4, horizontal well fracturing construction site needs reasonable Arrangement, required fracturing unit is arranged in lane
It include water pot 6, fracturing pump 7, accumulator 8, pressure sensor 9, flow sensor 10, pressure in the layout drawing of construction site in road
Flow data collector device 11, high-pressure hose 12, hydraulic control high pressure gate 13, drilling machine 14, ESD control device 15, microseism data
Processing unit 16, microseism inductor 17, fracturing string 18, open-hole horizontal well 5.
Fracturing tool：In coal mine open-hole horizontal well, the outer diameter of oil pipe is not more than 60.3mm, and pressure-bearing is not less than 70MPa, is
It adapts to drilling machine in tunnel to use, the length of every oil pipe is not more than 3m.In place for convenience of drilling tool push, all steel pipes on tubing string
With chamfering is set in tool hoop, bottom cooperates semicircle guide shoe, and oil pipe adds centralizer every 20-30m, above and below open hole packer
Connector is machined with centralizer.
Pressure break is equipped：Drilling machine for the tripping in tunnel and acts fracturing string, and the push power and pulling force of drilling machine >=
10t；Fracturing pump uses driven high voltage water injecting pump, bicycle power >=50KW, operating pressure >=70MPa, discharge capacity >=1000L/
min；High-pressure hose, for connecting fracturing pump and oil pipe；105MPa high pressure hydraulic control needle valve, is mounted on the oil pipe of horizontal well well head
Place, is controlled by independent hydraulic station, energy emergency shutdown, safety equipment when being pressure break, be can avoid high-pressure hose explosion and is generated lane
Road and shaft safety problem.
Fracturing fluid is configured using clear water.In entire fracturing process, without adding sand into fracturing fluid.
The determination principle of fracturing parameter is small displacement, high pressure, it is ensured that seam is long long as far as possible.Fracturing section is drawn
Point, it needs to determine number of fragments according to horizontal segment lithologic character and pressure break scale, to the greatest extent in the case where every section of pressure break scale is certain
Pressure break number of fragments can be can increase.
Optionally fracturing effect is monitored according to production needs.Using passive micro-seismic monitoring method, in coal
Layer arranges receiver, the three-dimensional trend in real-time monitoring crack in tunnel；High pressure water injection pump discharge installs pressure discharge capacity recorder, real
When monitoring frac pressure and discharge capacity.
The staged fracturing method of the naked eye horizontal segment is double envelope single deck tape-recorder staged fracturings, the main spy which implements
Point is " double envelope single deck tape-recorders ", i.e. two twin packers, card seal an independent fracturing section.Fracturing string：Oil pipe+safety joint+righting
Device+hydraulic packer+opened by pressure sliding sleeve+hydraulic packer+centralizer+guide shoe, first pressure break horizontal segment bosom complete first
Dragging tubing string to opened by pressure sliding sleeve is directed at the second fracturing section after section pressure break, and pressure break second segment, so circulation complete N sections of pressures
It splits.
Staged fracturing is carried out to naked eye horizontal segment using the method for double envelope single deck tape-recorder staged fracturings, includes according to sequencing
Following steps：
Step 1.1：The naked of first horizontal well is pushed to using the fracturing string that drilling machine prepares group in coal mine roadway
In eye horizontal segment, until opened by pressure sliding sleeve is directed at the first fracturing section；
Step 1.2：Fracturing pump in tunnel is connected on oil pipe, fracturing pump is opened and is injected without sand fracturing fluid, oil is worked as
When pressure in pipe rises to 2-3MPa, two hydraulic packers are setting, when the pressure in oil pipe rises to 5-8MPa, sliding sleeve
It opens, fracturing pump continues to inject without sand fracturing fluid into fracturing string with the first fracturing section of pressure break；
Step 1.3：Pressure in oil pipe rises rapidly, and reaches pressure required for tight roof ruptures, then the row of maintenance
Pressure vee crack is measured, until pressure declines suddenly, when observing the pressure trend of fracturing pump and no longer changing, the first pressure can be completed
Split the pressure break of section；
Step 1.4：Slowly bleeding off pressure pressure to oil pipe is 0MPa, and drilling machine drag fracturing tubing string to the is used in tunnel
Two fracturing sections make opened by pressure sliding sleeve be directed at the second fracturing section；
Step 1.5：Step 1.2 is repeated to step 1.3, the pressure break of the second fracturing section can be completed；
Step 1.6：Repeat step 1.4 to step 1.5 several times after, the pressure break of N fracturing section can be completed；
Step 1.7：The pressure slowly bled off pressure to oil pipe is 0MPa, rises by fracturing string using drilling machine in tunnel,
The staged fracturing of first horizontal well can be completed；
Step 1.8：Repeat step 1.1 to step 1.7 several times after, can be completed entire working face double envelope single deck tape-recorders segmentation
Pressure break.
The technical solution of the present embodiment can be brought the following benefits：In tunnel, directional drilling machine is crept into upwards, individual well
Footage unpayable is few；Horizontal segment barefoot completion, it is cost-saved, improve working efficiency；Entire working face all covers；Staged fracturing
Tight roof extinction can be completed before coal mining；It is constructed using directional drilling machine, borehole size is big, and fracturing string is easy push-in, pipe
The design of column can make tubing string be sent into and pull out freely in horizontal well, and the success rate of staged fracturing is high, while reducing people
Work labor intensity；A time fracturing string can realize n times staged fracturing, greatly shortening pressure break period；It can solve working face deep
Top plate extinction problem；Many cracks can be integrally manufactured in top plate same level, destroy the structure of entire face roof, mention
Preceding extinction, overall effect are significant.The present embodiment is suitable for the tight roofs such as coal mine siltstone, carbonate rock, for it is advanced, economical,
The outstanding problem for reliably solving coal mine tight roof provides drilling well and pressure break overall plan.
Embodiment two：
Shift to an earlier date another embodiment of outburst elimination method, technique in the tunnel of coal mine tight roof according to the invention full face
Step, the design formula of drilling well and construction parameter, principle, used construction equipment, beneficial effect etc. with one phase of embodiment
Together, unlike：
The staged fracturing method of the naked eye horizontal segment is water-jet staged fracturing, the main spy which implements
Point is " water-jet ", i.e., generates high-velocity fluid with water-jet head and penetrate rock formation eyelet, subsequent annulus water injection fluid infusion, stream
Body generates the pressure for being higher than fracture pressure in eyelet bottom, extends hydraulic fracture.Fracturing string：Oil pipe+safety joint+waterpower spray
Emitter+hydraulic packer+centralizer+guide shoe, first pressure break horizontal segment bosom drag tubing string to waterpower after completing first segment pressure break
Injector is directed at the second fracturing section, and pressure break second segment, so circulation complete N sections of pressure breaks.
Staged fracturing is carried out to naked eye horizontal segment using the method for water-jet staged fracturing, includes according to sequencing
Following steps：
Step 2.1：It is pushed in naked eye horizontal segment in coal mine roadway using the fracturing string that drilling machine prepares group, until
Hydraulic ejector is directed at the first fracturing section；
Step 2.2：Fracturing pump in tunnel is connected on oil pipe, fracturing pump is opened and injects fracturing fluid containing sand, works as oil
When pressure in pipe rises to 2-3MPa, hydraulic packer is setting, when the pressure in oil pipe rises to 5-8MPa, opens waterpower
Injector simultaneously sprays fracturing fluid containing sand, and when the pressure in oil pipe rises to 40-45MPa, hydraulic ejector starts perforation, simultaneously
Into annular space, injection is without sand fracturing fluid with the first fracturing section of pressure break；
Step 2.3：Pressure in oil pipe rises rapidly, and reaches pressure required for tight roof ruptures, then the row of maintenance
Pressure vee crack is measured, until pressure declines suddenly, when observing the pressure trend of fracturing pump and no longer changing, the first pressure can be completed
Split the pressure break of section；
Step 2.4：Slowly bleeding off pressure pressure to oil pipe is 0MPa, and drilling machine drag fracturing tubing string to the is used in tunnel
Two fracturing sections make hydraulic ejector be directed at the second fracturing section；
Step 2.5：Step 2.2 is repeated to step 2.3, the pressure break of the second fracturing section can be completed；
Step 2.6：Repeat step 2.4 to step 2.5 several times after, the pressure break of N fracturing section can be completed；
Step 2.7：The pressure slowly bled off pressure to oil pipe is 0MPa, rises by fracturing string using drilling machine in tunnel,
The staged fracturing of first horizontal well can be completed；
Step 2.8：Repeat step 2.1 to step 2.7 several times after, can be completed entire working face water-jet segmentation
Pressure break.
Using water-jet staged fracturing method, when spraying every section of perforation, needs into fracturing fluid plus sand, sand feeding amount are pressed
Design sand feeding amount lower limit execute, the fracture extension stage without plus sand.
Embodiment three：
Shift to an earlier date another embodiment of outburst elimination method, technique in the tunnel of coal mine tight roof according to the invention full face
Step, the design formula of drilling well and construction parameter, principle, used construction equipment, beneficial effect etc. with one phase of embodiment
Together, unlike：
The staged fracturing method of the naked eye horizontal segment is pitching sliding sleeve staged fracturing, the main spy which implements
Point is " pitching sliding sleeve ", " fixed tubular column ", i.e., merges into one-trip string tripping in together with completion tubular column and fracturing string, using outstanding
Hang the tools G.I.Hs such as packer, expanding open hole packer, pitching sliding sleeve, pressure difference sliding sleeve and setting ball seat.Pressure break pipe
Column：Hanging packer+open hole packer N+ pitching sliding sleeve N+ separating tube+open hole packer N-1+ pitching sliding sleeve N-1+ separates
Pipe ... II+separating tube of+open hole packer II+pitching sliding sleeve+I+separating tube of open hole packer I+pressure difference sliding sleeve+ball seat+guide shoe,
Horizontal segment is insulated using open hole packer, fracturing work well section laterally selective staged isolation is realized in pitching when pressure break, completes the
One section to N sections pressure breaks, to realize the complete fracturing work of full well section.
Staged fracturing is carried out to naked eye horizontal segment using the method for pitching sliding sleeve staged fracturing, includes according to sequencing
Following steps：
Step 3.1：It is pushed in naked eye horizontal segment in tunnel using the fracturing string that drilling machine prepares group, until pressure difference
Sliding sleeve I is directed at the first fracturing section；
Step 3.2：Ball I is launched in fracturing string；Fracturing pump in tunnel is connected on fracturing string, pressure break is opened
No sand fracturing fluid is pumped and injected, is pushed in ball I to ball seat；Slowly boost to the pressure of open hole packer setting, steady pressure
5min, then setting all open hole packers；
Step 3.3：Continue pressure required for boosting to starting differential pressure sliding sleeve I, opens pressure difference sliding sleeve I；Fracturing pump continues
Into fracturing string, injection is without sand fracturing fluid with the first fracturing section of pressure break；
Step 3.4：Pressure in oil pipe rises rapidly, and reaches pressure required for tight roof ruptures, then the row of maintenance
Pressure vee crack is measured, until pressure declines suddenly, when observing the pressure trend of fracturing pump and no longer changing, the first pressure can be completed
Split the pressure break of section；
Step 3.5：Ball II is launched in fracturing string, it is sliding into pitching to push ball II without sand fracturing fluid for fracturing pump injection
In set II；
Step 3.6：Step 3.4 is repeated, the pressure break of the second fracturing section can be completed；
Step 3.7：Repeat step 3.5 to step 3.6 several times after, the pressure break of N fracturing section can be completed；
Step 3.8：The pressure slowly bled off pressure to oil pipe is 0MPa, rises by fracturing string using drilling machine in tunnel,
The staged fracturing of first horizontal well can be completed；
Step 3.9：Repeat step 3.1 to step 3.8 several times after, can be completed entire working face pitching sliding sleeve segmentation
Pressure break.
Example IV：
Shift to an earlier date another embodiment of outburst elimination method, technique in the tunnel of coal mine tight roof according to the invention full face
Step, the design formula of drilling well and construction parameter, principle, used construction equipment, beneficial effect etc. with one phase of embodiment
Together, unlike：Angle theta=5 ° between naked eye horizontal segment and working face long axis direction.
Embodiment five：
Shift to an earlier date another embodiment of outburst elimination method, technique in the tunnel of coal mine tight roof according to the invention full face
Step, the design formula of drilling well and construction parameter, principle, used construction equipment, beneficial effect etc. with one phase of embodiment
Together, unlike：Angle theta=0 ° between naked eye horizontal segment and working face long axis direction.
Embodiment six：
Shift to an earlier date another embodiment of outburst elimination method, technique in the tunnel of coal mine tight roof according to the invention full face
Step, the design formula of drilling well and construction parameter, principle, used construction equipment, beneficial effect etc. with one phase of embodiment
Together, unlike：Angle β=0 ° between working face long axis direction and tight roof minimum principal stress direction, naked eye horizontal segment
Angle with angle theta=0 ° between working face long axis direction, between naked eye horizontal segment and tight roof minimum principal stress direction
γ=0 °.
Embodiment seven：
As shown in figure 5, shifting to an earlier date another reality of outburst elimination method in the tunnel of coal mine tight roof according to the invention full face
Apply example, processing step, the design formula of drilling well and construction parameter, principle, used construction equipment, beneficial effect etc. with
Embodiment one is identical, unlike：In step 2, directional drilling machine is arranged in the corresponding working face starting end in coal mine two sides tunnel 3,
And is respectively bored to the predeterminated position of top tight roof 1 with certain blowing angle respectively in two sides tunnel 3 using the directional drilling machine
A bite horizontal well 4, horizontal segment end at a certain distance from working face central axes, then each in the same way to bore second
Saliva horizontal well 4, until n-th mouthful of water horizontal well 4, the equal barefoot completion of horizontal segment of each horizontal well 4.
In the present embodiment, there is roadway layout drilling machine in working face two sides, is opened in two sides tunnel with certain blowing angle
Individual well drilling depth can be effectively reduced until running through working face drilling well in hole in this way, reduce the requirement to drill drilling ability.
It will be apparent to those skilled in the art that shifting to an earlier date outburst elimination method in coal mine tight roof full face tunnel of the invention
Each section shown by summary of the invention and specific embodiment part and attached drawing including aforementioned present invention specification it is any
Combination describes one by one as space is limited and for each scheme for keeping specification concise without constituting these combinations.It is all in the present invention
Spirit and principle within, any modification, equivalent substitution, improvement and etc. done, should be included in protection scope of the present invention it
It is interior.
Claims (10)
1. shifting to an earlier date outburst elimination method in a kind of tunnel of coal mine tight roof full face, include the following steps according to sequencing：
Step 1：According to the data of site operation early period acquisition and design data drilling parameter and fracturing parameter；
Step 2：In coal mine side tunnel, corresponding working face starting end arranges directional drilling machine, and using the directional drilling machine with one
Determine blowing angle and bore first horizontal well to the predeterminated position of top tight roof, horizontal segment ends at apart from work surface edges one
At set a distance, second mouthful of water horizontal well is then bored in the same way, until n-th mouthful of water horizontal well, the horizontal segment of each horizontal well are naked
The complete well of eye；Or
In coal mine two sides tunnel, corresponding working face starting end arranges directional drilling machine, and using the directional drilling machine in two sides tunnel point
First horizontal well is not bored respectively to the predeterminated position of top tight roof with certain blowing angle, horizontal segment ends at apart from work
At a certain distance from making face central axes, second mouthful of water horizontal well is then respectively bored in the same way, until n-th mouthful of water horizontal well, each level
The equal barefoot completion of the horizontal segment of well；
Step 3：Equipment required for appropriate area arrangement horizontal well fracturing in subsurface tunnel is constructed；
Step 4：Staged fracturing construction is carried out to the naked eye horizontal segment of horizontal well, is covered with the tight roof of entire working face and splits
Seam, to achieve the purpose that shift to an earlier date extinction in the tunnel of coal mine tight roof full face.
2. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as described in claim 1 full face, it is characterised in that：It is described
Angle between the long axis direction of working face and the minimum principal stress direction of the tight roof is β, 0 °≤β≤55 °.
3. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as claimed in claim 2 full face, it is characterised in that：It is described
The long axis direction of working face is along the minimum principal stress direction arrangement of the tight roof, i.e. β=0 °.
4. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as claimed in claim 2 full face, it is characterised in that：It is described
Angle between naked eye horizontal segment and the long axis direction of the working face is θ, 0 °≤θ≤10 °.
5. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as claimed in claim 4 full face, it is characterised in that：It is described
Naked eye horizontal segment is along the minimum principal stress direction arrangement of the tight roof, i.e. θ=0 °.
6. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as described in claim 1 full face, it is characterised in that：In coal
Mine side tunnel, which corresponds to, arranges that the quantity of horizontal well should meet following relationship on working face
In formula, the quantity of n --- horizontal well, n takes the integer more than or equal to 1；
The length of L --- working face, m；
L' --- spacing of the adjacent two mouthfuls of water horizontal wells along roadway direction, m.
7. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as claimed in claim 6 full face, it is characterised in that：It is adjacent
The distance between two mouthfuls of water horizontal wells should meet following relationship
D=2 λ=L'cos θ
In formula, d --- the distance between adjacent two mouthfuls of water horizontal wells, m；
The seam of λ --- pressing crack construction is long, m；
L' --- spacing of the adjacent two mouthfuls of water horizontal wells along roadway direction, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
8. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as described in claim 1 full face, it is characterised in that：It is described
Naked eye horizontal segment is located at the predeterminated position of tight roof, and the determination of the predeterminated position should meet following relationship
In formula, h1--- the distance between naked eye horizontal segment and coal seam top surface, m；
h2--- the thickness in coal seam, m；
The rock deposit coefficient of volumetric expansion of K --- tight roof, coefficient range 1.15-1.25；
According to the lithology difference of tight roof by h1It is divided into several substratums, i.e. h11、h12.......h1n, after each substratum collapses
The corresponding rock deposit coefficient of volumetric expansion is K1、K2........Kn。
9. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as claimed in claim 8 full face, it is characterised in that：It is described
The terminal of naked eye horizontal segment should meet following relationship at a distance from work surface edges
In formula, d' --- the terminal of naked eye horizontal segment is at a distance from work surface edges, m；
The seam of λ --- pressing crack construction is long, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
10. shifting to an earlier date outburst elimination method in the tunnel of coal mine tight roof as claimed in claim 9 full face, it is characterised in that：Institute
The seam length for stating pressing crack construction should meet following relationship
In formula, the seam of λ --- pressing crack construction is long, m；
The width of W --- working face, m；
θ --- the angle of naked eye horizontal segment and working face long axis direction, °.
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| CN110056354A (en) * | 2019-04-22 | 2019-07-26 | 中国神华能源股份有限公司 | The method of horizontal well pitching sliding sleeve staged fracturing in coal mine tight roof tunnel |
| CN110056353A (en) * | 2019-04-22 | 2019-07-26 | 中国神华能源股份有限公司 | The method of tight roof horizontal well water-jet staged fracturing in coal mine roadway |
| CN110081786A (en) * | 2019-03-25 | 2019-08-02 | 大同煤矿集团有限责任公司 | Coal mine tight roof directional fracturing control method |
| CN110939442A (en) * | 2018-12-12 | 2020-03-31 | 天地科技股份有限公司 | Method for treating rock burst by pressure relief source in ground fracturing area |
| CN111810164A (en) * | 2020-07-13 | 2020-10-23 | 大同煤矿集团有限责任公司 | Hard roof cutting method based on perforation and hydraulic fracturing |
| CN112253114A (en) * | 2020-09-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for weakening hard gangue layer in coal seam by underground coal mine deep hole hydraulic presplitting |
| CN111119968B (en) * | 2019-11-18 | 2021-05-11 | 太原理工大学 | Method for eliminating large-area coming-pressure storm wind hazard of coal mine roof based on energy consumption and speed reduction |
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| CN111119968B (en) * | 2019-11-18 | 2021-05-11 | 太原理工大学 | Method for eliminating large-area coming-pressure storm wind hazard of coal mine roof based on energy consumption and speed reduction |
| CN111810164A (en) * | 2020-07-13 | 2020-10-23 | 大同煤矿集团有限责任公司 | Hard roof cutting method based on perforation and hydraulic fracturing |
| CN111810164B (en) * | 2020-07-13 | 2022-05-31 | 晋能控股煤业集团有限公司 | Hard roof cutting method based on perforation and hydraulic fracturing |
| CN112253114A (en) * | 2020-09-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for weakening hard gangue layer in coal seam by underground coal mine deep hole hydraulic presplitting |
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Application publication date: 20181120 |