CN108756884A - Coal mine tight roof full face ground shifts to an earlier date outburst elimination method - Google Patents
Coal mine tight roof full face ground shifts to an earlier date outburst elimination method Download PDFInfo
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- CN108756884A CN108756884A CN201810601748.5A CN201810601748A CN108756884A CN 108756884 A CN108756884 A CN 108756884A CN 201810601748 A CN201810601748 A CN 201810601748A CN 108756884 A CN108756884 A CN 108756884A
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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 present invention relates to a kind of coal mine tight roof full face ground to shift to an earlier date outburst elimination method, includes the following steps：According to the data of site operation acquisition early period and design data drilling parameter and fracturing parameter；Directional drilling machine is arranged on the corresponding ground of a certain working face of coal mine, and uses predeterminated position horizontal well drilling of the directional drilling machine to tight roof, the horizontal segment barefoot completion of the horizontal well；In the required equipment of drilling well site arrangement horizontal well fracturing construction；Staged fracturing construction is carried out to the bore hole horizontal segment of horizontal well, so that the tight roof of entire working face is covered with crack, to achieve the purpose that coal mine tight roof full face ground shifts to an earlier date extinction.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 notable.
Description
Technical field
The invention belongs to coal mining technology fields, and in particular to a kind of coal mine tight roof full face ground disappears in advance
Burst method.
Background technology
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 mine generally use tool pillar mining methods of China manage tight roof, after 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 ensureing working face extraction in this way, but
It is the continuous expansion with productive area, the stress of stayed coal column gradually increases, and is crushed destruction 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 needs
Taking appropriate measures makes it be caving.In face of this major disaster, all various theory and technology measures are actively being taken both at home and abroad
Study and solve this problem, but the diversity of the 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, the prior art cannot achieve the purpose that coal mine tight roof carries out extinction in advance more than ground, Zhi Neng
Underground carries out extinction, i.e., extinction is carried out in coal mine roadway.Extinction is carried out in coal mine roadway, and explosion control top technology is usually taken
With tunnel interior orientation hydraulic fracturing technology, but all there are many defects in both methods in practice.
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 vibrations that overhead caving generates generate 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
Precalculated position footage unpayable is long, needs the off-angle drilling in tunnel；Need the both 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 a kind of novel coal mine tight roof full face ground of exploitation and shifts to an earlier date outburst elimination method, this method can
It is carried out before tunnelling, to realize comprehensive Advance presplitting to coal mine tight roof.
Invention content
To solve problems of the prior art, the present invention provides a kind of coal mine tight roof full face ground and shifts to an earlier date
Outburst elimination method includes the following steps according to sequencing：
Step 1：According to the data of site operation acquisition early period and design data drilling parameter and fracturing parameter；
Step 2：Directional drilling machine is arranged on the corresponding ground of a certain working face of coal mine, and uses the directional drilling machine to heavily fortified point
Resist the predeterminated position horizontal well drilling of plate, the horizontal segment barefoot completion of the horizontal well stubbornly；
Step 3：In the required equipment of drilling well site arrangement horizontal well fracturing construction；
Step 4：Staged fracturing construction is carried out to the bore hole horizontal segment of horizontal well, makes the tight roof cloth of entire working face
Full crack, to achieve the purpose that coal mine tight roof full face ground shifts to an earlier date extinction.
The full face of the present invention refers to that the coal seam of entire coal mining is divided into several small working faces, each unskilled labourer
The size for making face is usually 300 meters or so of width, 3000-5000 meters of length, and method through the invention makes entire small working face
Tight roof be covered with crack, you can solve the problems, such as the full face extinction of coal mine tight roof, other small working faces can be adopted
It is handled with same method.
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 stage staged fracturing, these factors are total
With structure and the track for determining horizontal well.
Technical solution using the present invention can be simutaneously arranged several saliva horizontal wells.It, can be in heavily fortified point when arranging a bite horizontal well
It resists the left or right side horizontal well drilling of plate working face stubbornly, also can bore a bite horizontal well in the intermediate of tight roof working face, then
In the bottom of its vertical section, bore hole horizontal segment is bored in both sides respectively to the left and right；It, can be respectively on hard top when arranging two mouthfuls of water horizontal wells
Each side brill a bite horizontal well of plate working face, also can be in the left or right side disposed at equal distance two of tight roof working face
Saliva horizontal well also can bore two mouthfuls of water horizontal wells in the intermediate of tight roof working face, then the bottom of Liang Koujing vertical sections to the left
Bore hole horizontal segment is bored in side respectively to the right；It, can be in the left or right side of tight roof working face when arranging three mouthfuls of water horizontal wells
Three mouthfuls of water horizontal wells of disposed at equal distance etc..According to actual conditions, there are the arrangement situations of several horizontal well.
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 bore hole 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 bore hole horizontal segment along the tight roof minimum principal stress side
To arrangement, i.e. θ=0 °.
Technical solution using the present invention usually requires that 0 °≤β≤55 ° and 0 °≤θ≤10 °, just can ensure that bore hole 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, a bite horizontal well, the horizontal well are at least arranged on same working face
Quantity should meet following relationship：N=-56.25T+5067.5
In formula, the quantity of n --- horizontal well, n takes the integer more than or equal to 1；
The specified pulling force of T --- directional drilling machine, t.
In any of the above-described scheme preferably, arrange the quantity of horizontal well no more than five mouthfuls, i.e., 1 on same working face
≤n≤5。
In any of the above-described scheme preferably, the bore hole 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 bore hole 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 bore hole horizontal segment is located at the intermediate position of the working face, and flat
Row is in the working face spread.
In any of the above-described scheme preferably, the beginning and end of the bore hole horizontal segment and the work surface edges it
Between distance it is equal, and the seam for being equal to pressing crack construction is grown.
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 grown, m；
The width of W --- working face, m；
θ --- the angle of bore hole 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 bore hole 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, when working face buried depth is 100-500m, water is designed using two opening structures
Horizontal well casing programme, i.e., one opens tripping in surface pipe, and the unconsolidated formation for sealing earth's surface of cementing the well, and two open horizontal segment barefoot completion；
When working face buried depth is 500-1000m, using three opening structure design level well casing programmes, i.e., one opens tripping in surface pipe,
And the unconsolidated formation for sealing earth's surface of cementing the well, two open tripping in protective casing, and the bad ground of section is opened in sealing two of cementing the well, and three boiling water are flat
Section barefoot completion.
In any of the above-described scheme preferably, the directional drilling machine arranges ground well head on the ground, the ground well head
It projects in the plane where working face and forms subpoint, the subpoint is between bore hole horizontal segment and work surface edges intersection point
Distance should meet following relationship：In formula, l1--- ground well head exists
Working face subpoint in the plane to the distance between bore hole horizontal segment and work surface edges intersection point, m；
D --- the borehole diameter of bore hole 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；
The seam of λ --- pressing crack construction is grown, mm；
θ --- the angle of bore hole horizontal segment and working face long axis direction, °；
δ --- safety coefficient.
In any of the above-described scheme preferably, the kickoff point (KOP) of the horizontal well and the ground well head are where working face
The distance between subpoint in plane should meet following relationship：In formula, l2——
The kickoff point (KOP) of horizontal well and ground well head working face between subpoint in the plane at a distance from, m；
D --- the borehole diameter of bore hole 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 staged fracturing method of the bore hole horizontal segment is water-jet segmentation pressure
It splits or double envelope single deck tape-recorder staged fracturings or pitching sliding sleeve staged fracturing.
(1) 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, subsequent annulus water injection fluid infusion, and fluid is generated in eyelet bottom 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 cycle complete N sections of pressure breaks.
(2) 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 cycle 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 tubes+open hole packer N-1+ pitching sliding sleeve N-1+ separating tubes ...+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, bore hole horizontal segment is divided using the method for water-jet staged fracturing
Section pressure break, includes the following steps according to sequencing：
Step 1.1：The fracturing string that group prepares is pushed to using coild tubing unit or workover rig on the ground naked
In eye horizontal segment, until hydraulic ejector is directed at the first fracturing section；
Step 1.2：Fracturing pump on ground 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
It is injected into annular space without sand fracturing fluid with the first fracturing section of pressure break；
Step 1.3：Pressure in oil pipe rises rapidly, reaches tight roof and ruptures required pressure, 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, you can complete the first pressure
Split the pressure break of section；
Step 1.4：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Machine drag fracturing tubing string makes hydraulic ejector be directed at the second fracturing section to the second fracturing section；
Step 1.5：Step 1.2 is repeated to step 1.3, you can complete the pressure break of the second fracturing section；
Step 1.6：Repeat step 1.4 to step 1.5 several times after, you can complete N fracturing sections pressure break；
Step 1.7：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Fracturing string is risen by machine, you can completes the water-jet staged fracturing of entire working face.
In any of the above-described scheme preferably, the method using double envelope single deck tape-recorder staged fracturings divides bore hole horizontal segment
Section pressure break, includes the following steps according to sequencing：
Step 2.1：The fracturing string that group prepares is pushed to using coild tubing unit or workover rig on the ground naked
In eye horizontal segment, until opened by pressure sliding sleeve is directed at the first fracturing section；
Step 2.2：Fracturing pump on ground 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 with the first fracturing section of pressure break into fracturing string；
Step 2.3：Pressure in oil pipe rises rapidly, reaches tight roof and ruptures required pressure, 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, you can complete the first pressure
Split the pressure break of section；
Step 2.4：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Machine drag fracturing tubing string makes opened by pressure sliding sleeve be directed at the second fracturing section to the second fracturing section；
Step 2.5：Step 2.2 is repeated to step 2.3, you can complete the pressure break of the second fracturing section；
Step 2.6：Repeat step 2.4 to step 2.5 several times after, you can complete N fracturing sections pressure break；
Step 2.7：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Fracturing string is risen by machine, you can completes double envelope single deck tape-recorder staged fracturings of entire working face.
In any of the above-described scheme preferably, the method using pitching sliding sleeve staged fracturing divides bore hole horizontal segment
Section pressure break, includes the following steps according to sequencing：
Step 3.1：The fracturing string that group prepares is pushed to using coild tubing unit or workover rig on the ground naked
In eye horizontal segment, 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 on ground 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 to boost to I required pressure of starting differential pressure sliding sleeve, opens pressure difference sliding sleeve I；Fracturing pump continues
It is injected into fracturing string without sand fracturing fluid with the first fracturing section of pressure break；
Step 3.4：Pressure in oil pipe rises rapidly, reaches tight roof and ruptures required pressure, 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, you can complete the first pressure
Split the pressure break of section；
Step 3.5：Ball II is launched in fracturing string, without sand fracturing fluid, push ball II enters pitching and slides for fracturing pump injection
In set II；
Step 3.6：Repeat step 3.4, you can complete the pressure break of the second fracturing section；
Step 3.7：Repeat step 3.5 to step 3.6 several times after, you can complete N fracturing sections pressure break；
Step 3.8：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Fracturing string is risen by machine, you can completes the pitching sliding sleeve staged fracturing of entire working face.
Horizontal well fracturing construction site needs reasonable Arrangement, and construction site layout drawing includes ground well head, micro-
Shake monitoring results area, pressure break pump truck, high pressure pipe joint, fracturing blender truck, liquid supply vehicle, silo area, silo vehicle, is hung coild tubing unit
Vehicle, flow container area, low-pressure manifold, measuring truck, power generation room, room on duty, oil truck, mud pit.In double envelope single deck tape-recorder staged fracturings and throwing
In ball sliding sleeve staged fracturing, without arranging silo area and silo vehicle in the layout drawing of construction site.
Pressure break is equipped：Coild tubing unit or workover rig, for pushing and rising out fracturing string；Fracturing pump,
Bicycle power >=2000KW, operating pressure >=100MPa, discharge capacity >=10m3/min；105MPa high pressure hard tubes, for connecting pressure break
Pump and well head；105MPa high pressure hydraulic control flap types are mounted at horizontal well well head, by independent hydraulic pressure stand control, can promptly close
It is disconnected, safety equipment when being pressure break.
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 are all not necessarily to add sand into fracturing fluid in entire fracturing process.
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 may be increased.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.
It needs optionally to be monitored fracturing effect according to production.Using passive micro-seismic monitoring method, in well
Receiver is arranged on field and periphery, monitors the three-dimensional trend in crack in real time；Frac pressure and discharge capacity etc. are monitored in real time using measuring truck
Construction parameter.
The coal mine tight roof full face ground of the present invention shifts to an earlier date outburst elimination method, using directional drilling machine on ground to coal seam
The predeterminated position of tight roof bores several open-hole horizontal wells, carries out staged fracturing in open-hole horizontal well section, makes entire working face top
Plate is covered with crack, to solve the problems, such as the full face extinction of coal mine tight roof, avoids that accident occurs in process of coal mining,
It eliminates safe hidden trouble.
Technical scheme of the present invention can bring following advantageous effect：It is crept into using surface orientation, securely and reliably；Horizontal segment
Barefoot completion, it is cost-saved, improve working efficiency；Entire working face all covers；Staged fracturing can be completed before coal mining
Tight roof extinction；It is constructed using directional drilling machine, borehole size is big, and fracturing string is easy tripping in, and the design of tubing string can make pipe
Column is sent into and is pulled out freely in horizontal well, and the success rate of staged fracturing is high；A time fracturing string can realize n times segmentation pressure
It splits, greatly shortens the pressure break period；It can solve the problems, such as the top plate extinction of working face deep；It can integrally be made in top plate same level
Many cracks are made, destroy the structure of entire working face tight roof, extinction in advance, overall effect is notable.
Technical scheme 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.
Description of the drawings
Fig. 1 is in the preferred embodiment that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
Horizontal well arrangement schematic diagram；
Fig. 2 is the embodiment illustrated in fig. 1 that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
The sectional view of middle bore hole horizontal segment and tight roof position relationship；
Fig. 3 is the embodiment illustrated in fig. 1 that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
The vertical view of middle bore hole horizontal segment and tight roof position relationship；
Fig. 4 is the embodiment illustrated in fig. 1 that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
The schematic diagram of middle Horizontal Well body structure；
Fig. 5 is the embodiment illustrated in fig. 1 that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
Middle horizontal well fracturing construction plan；
Fig. 6 is another preferred embodiment that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
Middle horizontal well arrangement schematic diagram；
Fig. 7 is another preferred embodiment that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
Middle horizontal well arrangement schematic diagram；
Fig. 8 is another preferred embodiment that coal mine tight roof according to the invention full face ground shifts to an earlier date outburst elimination method
Middle horizontal well arrangement schematic diagram.
Explanation is marked in figure：1- tight roofs, 2- horizontal wells, 3- bore hole horizontal segments, the coal seams 4-, 5- surface pipes, 6- skills
Art casing, the ground 7- well head, 8- micro-seismic monitorings operation area, 9- coild tubing units or workover rig, 10- pressure break pump trucks, 11-
High pressure pipe joint, 12- fracturing blender trucks, 13- liquid supply vehicles, 14- silos area, 15- silo vehicles, 16- cranes, 17- flow containers area, 18- low-voltage tubes
It converges, 19- measuring trucks, 20- power generation rooms, the rooms on duty 21-, 22- oil trucks, 23- mud pits.
Specific implementation mode
In order to be further understood that the invention content of the present invention, the present invention is elaborated below in conjunction with specific embodiment.
Embodiment one：
Coal mine tight roof according to the invention full face ground shifts to an earlier date an embodiment of outburst elimination method, according to successively
Sequence includes the following steps：
Step 1：According to the data of site operation acquisition early period and design data drilling parameter and fracturing parameter；
Step 2：Directional drilling machine is arranged on the corresponding ground of a certain working face of coal mine, and uses the directional drilling machine to heavily fortified point
Resist the predeterminated position horizontal well drilling of plate, the horizontal segment barefoot completion of the horizontal well stubbornly；
Step 3：In the required equipment of drilling well site arrangement horizontal well fracturing construction；
Step 4：Staged fracturing construction is carried out to the bore hole horizontal segment of horizontal well, makes the tight roof cloth of entire working face
Full crack, to achieve the purpose that coal mine tight roof full face ground shifts to an earlier date extinction.
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 stage 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, angles of the θ between bore hole horizontal segment and working face long axis direction,
Angles of the γ between bore hole horizontal segment and tight roof minimum principal stress direction.
The quantity of the horizontal well should meet following relationship：N=-56.25T+5067.5
In formula, the quantity of n --- horizontal well, n takes the integer more than or equal to 1；
The specified pulling force of T --- directional drilling machine, t.
The bore hole 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 bore hole 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 bore hole horizontal segment is located at the intermediate position of the working face, and is parallel to the working face spread.It is described naked
The beginning and end of eye horizontal segment is equal with the distance between the work surface edges, and the seam for being equal to pressing crack construction is grown.
The seam length of the pressing crack construction should meet following relationship：
In formula, the seam of λ --- pressing crack construction is grown, m；
The width of W --- working face, m；
θ --- the angle of bore hole 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 bore hole 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.
When working face buried depth is 100-500m, using two opening structure design level well casing programmes, i.e., one opens tripping in table
Layer casing, and the unconsolidated formation for sealing earth's surface of cementing the well, two open horizontal segment barefoot completion；When working face buried depth is 500-1000m,
Using three opening structure design level well casing programmes, i.e., one opens tripping in surface pipe, and the unconsolidated formation for sealing earth's surface of cementing the well, and two
Tripping in protective casing is opened, and the bad ground of section is opened in sealing two of cementing the well, three open horizontal segment barefoot completion.
The directional drilling machine arranges ground well head on the ground, which projects to shape in the plane where working face
At subpoint, which should meet following relationship to the distance between bore hole horizontal segment and work surface edges intersection point：
In formula, l1--- ground well head working face subpoint in the plane to bore hole horizontal segment and work surface edges
The distance between intersection point, m；
D --- the borehole diameter of bore hole 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；
The seam of λ --- pressing crack construction is grown, mm；
θ --- the angle of bore hole horizontal segment and working face long axis direction, °；
δ --- safety coefficient.
The kickoff point (KOP) of the horizontal well and the ground well head working face between subpoint in the plane at a distance from
Following relationship should be met：
In formula, l2--- the kickoff point (KOP) and ground well head of horizontal well working face between subpoint in the plane away from
From m；
D --- the borehole diameter of bore hole 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 the present embodiment, coal mine working face coal seam buried depth is 700m, difficult in mining height 6m, tight roof 50m to collapse
Siltstone, angle theta=10 ° between bore hole horizontal segment and working face long axis direction, face width 300m, length are
5000m。
As shown in Figs. 1-3, tight roof 1 is located at 4 top of coal seam, and the bore hole of arrangement a bite horizontal well 2, horizontal well 2 is horizontal
Section 3 is arranged in the predeterminated position of tight roof 1.In Fig. 3, A is the starting point of bore hole horizontal segment, and B is the terminal of bore hole horizontal segment, O
For ground well head working face subpoint in the plane, C be the intersection point of bore hole horizontal segment and work surface edges, D is level
Well kickoff point (KOP), E for center of working face point tight roof subpoint in the plane.In Fig. 3, D1=D2, D1With D2The sum of etc.
In the width of working face；d1=d2, the seam for being equal to pressing crack construction grows；OC=l1, OD=l2.In the present embodiment, D1=D2=
150m, d1=d2=150m, h1=30m, h2=6m, bore hole horizontal segment AB=4700m, total pressure break 235 primary every 20m pressure breaks
Section.
As shown in figure 4, arranging directional drilling machine on the ground right over coal mine working face right end, use 311.2mm's
Drill bit one opens 150m, the surface pipe 5 of tripping in 244.5mm, and cements the well；850m is opened using the drill bit two of 215.9mm, at 450m
Start deflecting, the protective casing 6 of tripping in 177.8mm, and cements the well；It is opened using the drill bit three of 152mm, horizontal segment originates in 850m's
A points end at the B points of 5550m, horizontal segment barefoot completion.Milling shoe through wash well is used after being drilled, and keeps the borehole wall smooth.
As shown in figure 5, it includes ground that horizontal well fracturing construction site, which needs reasonable Arrangement, construction site layout drawing,
Well head 7, micro-seismic monitoring operation area 8, coild tubing unit or workover rig 9, pressure break pump truck 10, high pressure pipe joint 11, fracturing blender truck
12, liquid supply vehicle 13, silo area 14, silo vehicle 15, crane 16, flow container area 17, low-pressure manifold 18, measuring truck 19, power generation room 20, value
Jail 21, oil truck 22, mud pit 23.
Pressure break is equipped：Coild tubing unit or workover rig, for pushing and rising out fracturing string；Fracturing pump,
Bicycle power >=2000KW, operating pressure >=100MPa, discharge capacity >=10m3/min；105MPa high pressure hard tubes, for connecting pressure break
Pump and well head；105MPa high pressure hydraulic control flap types are mounted at horizontal well well head, by independent hydraulic pressure stand control, can promptly close
It is disconnected, safety equipment when being pressure break.
Fracturing fluid is configured using clear water, when spraying every section of perforation, needs to add sand into fracturing fluid, sand feeding amount is according to design
The lower limit of sand feeding amount executes, in the fracture extension stage without adding sand.
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 may be increased.
It needs optionally to be monitored fracturing effect according to production.Using passive micro-seismic monitoring method, in well
Receiver is arranged on field and periphery, monitors the three-dimensional trend in crack in real time；Frac pressure and discharge capacity etc. are monitored in real time using measuring truck
Construction parameter.
The staged fracturing method of the bore hole horizontal segment is water-jet staged fracturing, the main spy which implements
Point is " water-jet ", i.e., generating high-velocity fluid with water-jet head penetrates rock formation eyelet, subsequent annulus water injection fluid infusion, stream
Body generates the pressure 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 cycle complete N sections of pressure breaks.
Staged fracturing is carried out to bore hole horizontal segment using the method for water-jet staged fracturing, includes according to sequencing
Following steps：
Step 1.1：The fracturing string that group prepares is pushed to using coild tubing unit or workover rig on the ground naked
In eye horizontal segment, until hydraulic ejector is directed at the first fracturing section；
Step 1.2：Fracturing pump on ground 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
It is injected into annular space without sand fracturing fluid with the first fracturing section of pressure break；
Step 1.3：Pressure in oil pipe rises rapidly, reaches tight roof and ruptures required pressure, 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, you can complete the first pressure
Split the pressure break of section；
Step 1.4：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Machine drag fracturing tubing string makes hydraulic ejector be directed at the second fracturing section to the second fracturing section；
Step 1.5：Step 1.2 is repeated to step 1.3, you can complete the pressure break of the second fracturing section；
Step 1.6：Repeat step 1.4 to step 1.5 several times after, you can complete N fracturing sections pressure break；
Step 1.7：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Fracturing string is risen by machine, you can completes the water-jet staged fracturing of entire working face.
The technical solution of the present embodiment can bring following advantageous effect：It is crept into using surface orientation, securely and reliably；It is horizontal
Section barefoot completion, it is cost-saved, improve working efficiency；Entire working face all covers；Staged fracturing can be complete before coal mining
At tight roof extinction；It is constructed using directional drilling machine, borehole size is big, and fracturing string is easy tripping in, and the design of tubing string can make
Tubing string is sent into and is pulled out freely in horizontal well, and the success rate of staged fracturing is high；A time fracturing string can realize n times segmentation pressure
It splits, greatly shortens the pressure break period；It can solve the problems, such as the top plate extinction of working face deep；It can integrally be made in top plate same level
Many cracks are made, destroy the structure of entire working face tight roof, extinction in advance, overall effect is notable.The present embodiment is suitable for
The tight roofs such as coal mine siltstone, carbonate rock carry for outstanding problem that is advanced, economic, reliably solving coal mine tight roof
Drilling well and pressure break overall plan are supplied.
Embodiment two：
Coal mine tight roof according to the invention full face ground shifts to an earlier date another embodiment of outburst elimination method, technique step
Suddenly, the design formula of drilling well and construction parameter, principle, used construction equipment, advantageous effect etc. are identical as embodiment one,
Unlike：
The staged fracturing method of the bore hole 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 cycle complete N sections of pressures
It splits.
Staged fracturing is carried out to bore hole horizontal segment using the method for double envelope single deck tape-recorder staged fracturings, includes according to sequencing
Following steps：
Step 2.1：The fracturing string that group prepares is pushed to using coild tubing unit or workover rig on the ground naked
In eye horizontal segment, until opened by pressure sliding sleeve is directed at the first fracturing section；
Step 2.2：Fracturing pump on ground 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 with the first fracturing section of pressure break into fracturing string；
Step 2.3：Pressure in oil pipe rises rapidly, reaches tight roof and ruptures required pressure, 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, you can complete the first pressure
Split the pressure break of section；
Step 2.4：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Machine drag fracturing tubing string makes opened by pressure sliding sleeve be directed at the second fracturing section to the second fracturing section；
Step 2.5：Step 2.2 is repeated to step 2.3, you can complete the pressure break of the second fracturing section；
Step 2.6：Repeat step 2.4 to step 2.5 several times after, you can complete N fracturing sections pressure break；
Step 2.7：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Fracturing string is risen by machine, you can completes double envelope single deck tape-recorder staged fracturings of entire working face.
In double envelope single deck tape-recorder staged fracturings, without arranging silo area and silo vehicle in the layout drawing of construction site.Entirely pressing
During splitting, without adding sand into fracturing fluid.
Embodiment three：
Coal mine tight roof according to the invention full face ground shifts to an earlier date another embodiment of outburst elimination method, technique step
Suddenly, the design formula of drilling well and construction parameter, principle, used construction equipment, advantageous effect etc. are identical as embodiment one,
Unlike：
The staged fracturing method of the bore hole 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 tubes+open hole packer N-1+ pitching sliding sleeves 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,
Insulate horizontal segment using open hole packer, when pressure break pitching realize fracturing work well section laterally selective staged isolation, complete the
One section to N sections pressure breaks, to realize the complete fracturing work of full well section.
Staged fracturing is carried out to bore hole horizontal segment using the method for pitching sliding sleeve staged fracturing, includes according to sequencing
Following steps：
Step 3.1：It is using continuous oil pipe operation or workover rig that prepare be pushed to fracturing string of group is naked on the ground
In eye horizontal segment, 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 on ground 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 to boost to I required pressure of starting differential pressure sliding sleeve, opens pressure difference sliding sleeve I；Fracturing pump continues
It is injected into fracturing string without sand fracturing fluid with the first fracturing section of pressure break；
Step 3.4：Pressure in oil pipe rises rapidly, reaches tight roof and ruptures required pressure, 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, you can complete the first pressure
Split the pressure break of section；
Step 3.5：Ball II is launched in fracturing string, without sand fracturing fluid, push ball II enters pitching and slides for fracturing pump injection
In set II；
Step 3.6：Repeat step 3.4, you can complete the pressure break of the second fracturing section；
Step 3.7：Repeat step 3.5 to step 3.6 several times after, you can complete N fracturing sections pressure break；
Step 3.8：The pressure slowly bled off pressure to oil pipe is 0MPa, uses coild tubing unit or well workover on the ground
Fracturing string is risen by machine, you can completes the pitching sliding sleeve staged fracturing of entire working face.
In pitching sliding sleeve staged fracturing, without arranging silo area and silo vehicle in the layout drawing of construction site.Entirely pressing
During splitting, without adding sand into fracturing fluid.
Example IV：
As shown in fig. 6, coal mine tight roof according to the invention full face ground shifts to an earlier date another implementation of outburst elimination method
Example, processing step, the design formula of drilling well and construction parameter, principle, used construction equipment, advantageous effect etc. with reality
It is identical to apply example one, unlike：Two mouthfuls of water horizontal wells 2 are arranged, respectively in each side brill water of 1 working face of tight roof
Horizontal well 2, the bore hole horizontal segment 3 of horizontal well 2 are arranged in the predeterminated position of tight roof 1.Bore hole horizontal segment and working face long axis side
Angle theta=5 ° between.
Embodiment five：
As shown in fig. 7, coal mine tight roof according to the invention full face ground shifts to an earlier date another implementation of outburst elimination method
Example, processing step, the design formula of drilling well and construction parameter, principle, used construction equipment, advantageous effect etc. with reality
It is identical to apply example one, unlike：It arranges two mouthfuls of water horizontal wells 2, two mouthfuls of water horizontal wells 2 is bored in the centre position of 1 working face of tight roof,
The bore hole horizontal segment 3 of two mouthfuls of water horizontal wells 2 respectively arrange to the left and right by both sides.Folder between bore hole horizontal segment and working face long axis direction
Angle θ=0 °.
Embodiment six：
As shown in figure 8, coal mine tight roof according to the invention full face ground shifts to an earlier date another implementation of outburst elimination method
Example, processing step, the design formula of drilling well and construction parameter, principle, used construction equipment, advantageous effect etc. with reality
It is identical to apply example one, unlike：Arrange five mouthfuls of water horizontal wells 2, five mouthfuls of the disposed at equal distance since the left side of 1 working face of tight roof
Horizontal well 2, the bore hole horizontal segment 3 of horizontal well are arranged in the predeterminated position of tight roof 1.Working face long axis direction and tight roof
Angle β=0 ° between minimum principal stress direction, angle theta=0 ° between bore hole horizontal segment and working face long axis direction, bore hole
Angle γ=0 ° between horizontal segment and tight roof minimum principal stress direction.
It will be apparent to those skilled in the art that the coal mine tight roof full face ground of the present invention shifts to an earlier date outburst elimination method packet
Include aforementioned present invention specification invention content and arbitrary group of each section shown by specific embodiment part and attached drawing
It closes, describes one by one as space is limited and for each scheme for keeping specification concise without constituting these combinations.It is all the present invention
Within spirit and principle, any modification, equivalent substitution, improvement and etc. done should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of coal mine tight roof full face ground shifts to an earlier date outburst elimination method, include the following steps according to sequencing：
Step 1：According to the data of site operation acquisition early period and design data drilling parameter and fracturing parameter；
Step 2：Directional drilling machine is arranged on the corresponding ground of a certain working face of coal mine, and uses the directional drilling machine to hard top
The predeterminated position horizontal well drilling of plate, the horizontal segment barefoot completion of the horizontal well；
Step 3：In the required equipment of drilling well site arrangement horizontal well fracturing construction；
Step 4：Staged fracturing construction is carried out to the bore hole horizontal segment of horizontal well, so that the tight roof of entire working face is covered with and splits
Seam, to achieve the purpose that coal mine tight roof full face ground shifts to an earlier date extinction.
2. coal mine tight roof as described in claim 1 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：The work
It is β to make the angle between the long axis direction in face and the minimum principal stress direction of the tight roof, 0 °≤β≤55 °.
3. coal mine tight roof as claimed in claim 2 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：The work
Make the long axis direction in face along the minimum principal stress direction arrangement of the tight roof, i.e. β=0 °.
4. coal mine tight roof as claimed in claim 2 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：It is described naked
Angle between eye horizontal segment and the long axis direction of the working face is θ, 0 °≤θ≤10 °.
5. coal mine tight roof as claimed in claim 4 full face ground shifts to an earlier date outburst elimination method, 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. coal mine tight roof as described in claim 1 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：Same
At least arrange that a bite horizontal well, the quantity of the horizontal well should meet following relationship n=-56.25T+5067.5 on working face
In formula, the quantity of n --- horizontal well, n takes the integer more than or equal to 1；
The specified pulling force of T --- directional drilling machine, t.
7. coal mine tight roof as claimed in claim 6 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：Same
Arrange that the quantity of horizontal well is no more than five mouthfuls, i.e. 1≤n≤5 on working face.
8. coal mine tight roof as described in claim 1 full face ground shifts to an earlier date outburst elimination method, 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 bore hole 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. coal mine tight roof as described in claim 1 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：It is described naked
Eye horizontal segment is located at the intermediate position of the working face, and is parallel to the working face spread.
10. coal mine tight roof as claimed in claim 9 full face ground shifts to an earlier date outburst elimination method, it is characterised in that：It is described
The beginning and end of bore hole horizontal segment is equal with the distance between the work surface edges, and the seam for being equal to pressing crack construction is grown.
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| CN109539920A (en) * | 2018-12-27 | 2019-03-29 | 西安通源石油科技股份有限公司 | A kind of top plate fracturing method and device of coal mining |
| CN109886550A (en) * | 2019-01-23 | 2019-06-14 | 太原理工大学 | A comprehensive evaluation method for the effect of ground fracturing hard roof to control strong mine pressure in coal mines |
| CN109931062A (en) * | 2019-04-22 | 2019-06-25 | 中国神华能源股份有限公司 | The method of the double envelope single deck tape-recorder staged fracturings of tight roof horizontal well in coal mine roadway |
| 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 |
| CN110080769A (en) * | 2019-05-09 | 2019-08-02 | 大同煤矿集团有限责任公司 | A kind of coal mine faces sky stope drift active workings tight roof ground and precisely cuts top pressure relief 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 |
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| CN110939442B (en) * | 2018-12-12 | 2021-07-27 | 天地科技股份有限公司 | Method for treating rock burst by pressure relief source in ground fracturing area |
| 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 |
| CN111005723A (en) * | 2018-12-12 | 2020-04-14 | 天地科技股份有限公司 | Ground large-range rock stratum pre-splitting area anti-impact method based on up-down combined arrangement |
| CN111005722A (en) * | 2018-12-12 | 2020-04-14 | 天地科技股份有限公司 | Well arrangement method for governing rock burst at pressure relief source of ground fracturing area |
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| CN109931062A (en) * | 2019-04-22 | 2019-06-25 | 中国神华能源股份有限公司 | The method of the double envelope single deck tape-recorder staged fracturings of tight roof horizontal well in coal mine roadway |
| 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 |
| CN110080769A (en) * | 2019-05-09 | 2019-08-02 | 大同煤矿集团有限责任公司 | A kind of coal mine faces sky stope drift active workings tight roof ground and precisely cuts top pressure relief method |
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Application publication date: 20181106 |