CN109736876A - Large-diameter directional long-drill-hole extraction method for gas roof gushed by mining body - Google Patents
Large-diameter directional long-drill-hole extraction method for gas roof gushed by mining body Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 22
- 238000005065 mining Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 53
- 239000011435 rock Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 14
- 239000004744 fabric Substances 0.000 claims description 16
- 241000222712 Kinetoplastida Species 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000009191 jumping Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
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- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
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- 239000004568 cement Substances 0.000 description 1
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Abstract
The invention relates to a method for extracting a large-diameter directional long borehole of a gas roof gushed from a mining body, and belongs to the technical field of coal mining. The method comprises the following steps: s1: calculating and determining basic parameters of the large-diameter directional long drill hole of the top plate; s2: before stoping of a working face, upward pitching the hole at a large inclination angle to drill into a coal seam roof rock stratum; s3: and gradually adjusting the drilling angle by adopting a directional technology, so that the horizontal section of the drilled hole is arranged along the advancing direction of the working surface, and then finishing gas extraction. The invention can improve the extraction success rate of the large-diameter directional long drill hole of the top plate, thereby reducing the gas concentration of the working face, improving the safety factor of the working environment and increasing the economic benefit.
Description
Technical field
The invention belongs to coal mining technology field, it is related to one kind and adopts kinetoplast gushing out gas top plate major diameter directional long borehole
Pumping method.
Background technique
Mining influence body (referred to as adopting kinetoplast) with the increase of working face mining intensity and coal seam depth, near working face
Gas amount of gushing out sharply increase, traditional underground gas extraction technology (such as pipe laying extraction, high drill holes extracting) project amount
Greatly, inefficiency seriously affects the release of high yield potential, and especially country implements after simplifying the regulation such as ventilation, the lane that truncates, the lance
Shield more highlights, and urgent need seeks more economical efficient minery and gushes out gas drainage technology.
Top plate High Position Drilling is one of the effective technology means for administering goaf gas, current coal mine underground directional drilling
The accurate control of long drilled holes track may be implemented in equipment, guarantees effective extension of the drilling track in default layer position, improves drilling
Effective extraction distance, to effectively improve drilling gas extraction amount and extraction rate.
Down-hole coal bed exploitation can form a large amount of mining induced fissures in face surrounding rock.Mining induced fissure is broadly divided into two classes: laterally
Bedseparated fissures and vertical fracture crack.Lateral bedseparated fissures refer to that original rock stratum is caused between layers by after destroying
Occur along layer crack, so that so that coal seam is generated dilatancy makes gas release；Vertical fracture crack is the shape that is broken with rock depression
At wear a layer crack, its presence enables gas in upper and lower coal (rock) interflow.
The region that extraction drilling is arranged in cranny development and can be kept for a long time, is conducive to the efficient pumping of gas pressure relief
It adopts.By directional drilling machine construction km drilling, mash gas extraction long drilled holes are arranged in and adopt kinetoplast overlying strata gap region, change release
The migration sum aggregate conflux field of gas, can effectively solve the problems, such as the gas exceeding limit in upper corner and return.
Therefore, the present invention realizes the efficient extraction for adopting gas in kinetoplast using top plate High Position Drilling technology.
Summary of the invention
In view of this, adopting kinetoplast the purpose of the present invention is to provide one kind gushes out gas top plate major diameter directional long borehole pumping
Mining method improves top plate major diameter directional long borehole extraction success rate, and then reduces face gas concentration, improves operating environment
Safety coefficient, increase economic benefit.
In order to achieve the above objectives, the invention provides the following technical scheme:
It adopts kinetoplast and gushes out gas top plate major diameter directional long borehole pumping method, specifically includes the following steps:
S1: the basic parameter for determining top plate major diameter directional long borehole is calculated；
S2: before working face extraction, Roof Rock Strata of Coal Seam is proceeded to high inclination-angle super hole cutter of facing upward；
S3: gradually adjusting dilling angle using directional technology, so that drilling horizontal section is arranged along advance of the face direction, so
After complete gas drainage.
Further, in step S1, the basic parameter of the top plate major diameter directional long borehole includes the longitudinal direction of cloth bore region
Highly, drilling hole amount, the layer position selection of horizontal segment drilling and space layout, drill site and drilling parameter.
Further, longitudinal height determination of the cloth bore region includes:
The longitudinal direction of the cloth bore region of long drilled holes highly needs to meet following formula condition:
HIt splits>H>HIt emits (1)
In formula, H is longitudinal height of long drilled holes cloth bore region；HIt emitsFor caving zone height, m；HIt splitsIt is fissure zone height (containing emitting
Fall band height), m；
When the caving zone and fissure zone height that do not survey, calculated using following methods:
1) caving zone height:
In formula, M is mining height, m；Δ M is inbreak front top plate deflection, m；K is the broken swollen coefficient of inbreak sillar；α inclines for coal seam
Angle；
2) fissure zone height:
1. caving zone and fissure zone experience height range is calculated using empirical equation；
2. sentencing knowledge method using key stratum is divided into n combination rock stratum for working seam roof strata；
3. amendment fissure zone is high if be in a combination rock stratum with the fissure zone altitude range that empirical equation calculates
Degree；
4. being combined if be not in the same combination rock stratum with the fissure zone altitude range that empirical equation calculates with top
The lower boundary of rock stratum is fissure zone height.
Further, the step 3. described in amendment slit band height principle are as follows:
A. when average crack band height is in combination rock stratum, top, using the coboundary of the combination rock stratum as crack
Band height；
B. high using the lower boundary of the combination rock stratum as fissure zone when average crack band height is in combination rock stratum lower part
Degree.
Further, the drilling hole amount calculation formula are as follows:
In formula, m is top plate jumping chisel hole number, m；QIt gushesGush out gas scale, m for working face3/min；QIt controlsFor other technologies pumping
The gas scale of row, m3/min；qIt is singleFor single hole mash gas extraction scale, if taking 3~4, m without measured value3/min。
Further, horizontal segment drilling layer position selection and space layout specifically include:
Transverse direction, the drilling of same group of drill site are evenly arranged in the region of 0~0.3L of air return lane side (face width)
It is interior, first hole horizontal section and 5~10m of air return lane horizontal distance；
Longitudinal direction selects in the medium ground (sandstone, argillaceous limestone, arenaceous shale etc.) for being located at fissure zone middle and upper part
Cloth hole, construction depth of stratum should be not less than 3m；The main aperture section of the same drilling is arranged in as far as possible in a rock stratum, not across rock drilling
Layer；2~3 drillings close to air return lane, which are arranged in low level rock stratum, gushes out gas to control face upper corner angle and goaf,
Remaining drilling, which is arranged in high-order rock stratum, gushes out gas with control adjacent layer and this coal seam.
The beneficial effects of the present invention are: the present invention lays particular emphasis on the ginseng of major diameter directional long borehole compared with other technologies
The selection of level course position, spatial position selection, fissure zone altitude range, drilling hole amount, drilling ginseng has been set forth in detail in number optimization design
Several calculation methods can calculate optimal hole location and layer position by the above technology and select, improve top plate major diameter directional drilling
Extraction success rate, be applicable to different coal mine conditions, effectively increase the scope of application of the invention.Top can be improved in the present invention
Plate major diameter directional long borehole extraction success rate, and then face gas concentration is reduced, substantially increase the safety of operating environment
Coefficient increases economic benefit.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 adopts kinetoplast structural schematic diagram to be of the present invention；
Fig. 2 is drilling hole transverse direction arrangement schematic diagram；
Fig. 3 is total longitudinal direction arrangement schematic diagram that drills.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As shown in Figure 1, kinetoplast of the present invention of adopting gushes out gas top plate major diameter directional long borehole pumping method, specifically
The following steps are included:
S1: calculating the basic parameter for determining top plate major diameter directional long borehole, longitudinal height including cloth bore region, drilling
Quantity, the layer position selection of horizontal segment drilling and space layout, drill site and drilling parameter；
(1) longitudinal height of cloth bore region determines
Effectively to control gas at upper corner, extraction long drilled holes should be arranged in the roof strata near tailentry road
It is interior.To guarantee extracting result, drilling horizontal section need to be arranged in top plate mining induced fissure band.
The longitudinal direction of the cloth bore region of long drilled holes highly needs to meet following formula condition:
HIt splits>H>HIt emits (1)
In formula, H is longitudinal height of long drilled holes cloth bore region；HIt emitsFor caving zone height, m；HIt splitsIt is fissure zone height (containing emitting
Fall band height), m；
When the caving zone and fissure zone height that do not survey, calculated using following methods:
1) caving zone height:
In formula, M is mining height, m；Δ M is inbreak front top plate deflection, m；K is the broken swollen coefficient of inbreak sillar；α inclines for coal seam
Angle；
2) fissure zone height:
1. caving zone and fissure zone experience height range is calculated using empirical equation；
2. sentencing knowledge method using key stratum is divided into n combination rock stratum for working seam roof strata；
3. being corrected if be in a combination rock stratum with the fissure zone altitude range that empirical equation calculates by following principle
Fissure zone height:
A. when average crack band height is in combination rock stratum, top, using the coboundary of the combination rock stratum as crack
Band height；
B. high using the lower boundary of the combination rock stratum as fissure zone when average crack band height is in combination rock stratum lower part
Degree.
4. being combined if be not in the same combination rock stratum with the fissure zone altitude range that empirical equation calculates with top
The lower boundary of rock stratum is fissure zone height.
(2) drilling hole amount determines
The calculation formula of drilling hole amount are as follows:
In formula, m is top plate jumping chisel hole number, m；QIt gushesGush out gas scale, m for working face3/min；QIt controlsFor other technologies pumping
The gas scale of row, m3/min；qIt is singleFor single hole mash gas extraction scale, if taking 3~4, m without measured value3/min。
(3) selection of horizontal segment drilling layer position and space cloth
Transverse direction, as shown in Fig. 2, the drilling of same group of drill site is evenly arranged in 0~0.3L of air return lane side, (working face is wide
Degree) region in, first hole horizontal section and 5~10m of air return lane horizontal distance；
Longitudinal direction, as shown in figure 3, selection is in medium ground (sandstone, argillaceous limestone, the sand for being located at fissure zone middle and upper part
Matter shale etc.) interior cloth hole, construction depth of stratum should be not less than 3m；The main aperture section of the same drilling is arranged in a rock stratum as far as possible
It is interior, not across rock drilling layer；It is arranged in low level rock stratum close to 2~3 of air return lane drillings to control face upper corner angle and mined out
Area gushes out gas, and remaining drilling, which is arranged in high-order rock stratum, gushes out gas with control adjacent layer and this coal seam.
(4) drill site and drilling parameter
During drilling construction, the size of drill site is at least width × depth=5m × 5m, the drilling overlap joint between adjacent drill site
Length should be no less than 30m.Using the secondary hole-sealing technology sealing of hole with pressure of high strength cement, sealing section depth is not less than 20m, and main aperture is straight
Diameter Φ 120mm~Φ 215mm, drilling horizontal section effective length range 400m~600m, drilling horizontal section answer low-angle it is single on
It faces upward or construction of underliing, fluctuating waveform is avoided to creep into.
S2: before working face extraction, Roof Rock Strata of Coal Seam is proceeded to high inclination-angle super hole cutter of facing upward；
S3: gradually adjusting dilling angle using directional technology, so that drilling horizontal section is arranged along advance of the face direction, so
After complete gas drainage.
The pumping method through the invention can be improved top plate major diameter directional long borehole extraction success rate, and then reduce
Face gas concentration substantially increases the safety coefficient of operating environment, increases economic benefit.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (6)
1. adopting kinetoplast gushes out gas top plate major diameter directional long borehole pumping method, which is characterized in that this method specifically include with
Lower step:
S1: the basic parameter for determining top plate major diameter directional long borehole is calculated；
S2: before working face extraction, Roof Rock Strata of Coal Seam is proceeded to high inclination-angle super hole cutter of facing upward；
S3: gradually adjusting dilling angle using directional technology, so that drilling horizontal section is arranged along advance of the face direction, it is then complete
At gas drainage.
2. kinetoplast according to claim 1 of adopting gushes out gas top plate major diameter directional long borehole pumping method, feature exists
In in step S1, the basic parameter of the top plate major diameter directional long borehole includes longitudinal height, the hole number of cloth bore region
Amount, the layer position selection of horizontal segment drilling and space layout, drill site and drilling parameter.
3. kinetoplast according to claim 2 of adopting gushes out gas top plate major diameter directional long borehole pumping method, feature exists
In longitudinal height determination of the cloth bore region includes:
The longitudinal direction of the cloth bore region of long drilled holes highly needs to meet following formula condition:
HIt splits>H>HIt emits (1)
In formula, H is longitudinal height of long drilled holes cloth bore region；HIt emitsFor caving zone height；HIt splitsFor fissure zone height；
When the caving zone and fissure zone height that do not survey, calculated using following methods:
1) caving zone height:
In formula, M is mining height；Δ M is inbreak front top plate deflection；K is the broken swollen coefficient of inbreak sillar；α is seam inclination；
2) fissure zone height:
1. caving zone and fissure zone experience height range is calculated using empirical equation；
2. sentencing knowledge method using key stratum is divided into n combination rock stratum for working seam roof strata；
3. correcting fissure zone height if be in a combination rock stratum with the fissure zone altitude range that empirical equation calculates；
4. combining rock stratum if be not in the same combination rock stratum with the fissure zone altitude range that empirical equation calculates with top
Lower boundary be fissure zone height.
4. kinetoplast according to claim 3 of adopting gushes out gas top plate major diameter directional long borehole pumping method, feature exists
In, the step 3. described in amendment slit band height principle are as follows:
A. high using the coboundary of the combination rock stratum as fissure zone when average crack band height is in combination rock stratum, top
Degree；
B. when average crack band height is in combination rock stratum lower part, using the lower boundary of the combination rock stratum as fissure zone height.
5. kinetoplast according to claim 2 of adopting gushes out gas top plate major diameter directional long borehole pumping method, feature exists
In the drilling hole amount calculation formula are as follows:
In formula, m is top plate jumping chisel hole number；QIt gushesGush out gas scale, m for working face3/min；QIt controlsFor watt of other technologies pump drainage
This scale, m3/min；qIt is singleFor single hole mash gas extraction scale, m3/min。
6. kinetoplast according to claim 2 of adopting gushes out gas top plate major diameter directional long borehole pumping method, feature exists
In horizontal segment drilling layer position selection and space layout specifically include:
The drilling of transverse direction, same group of drill site is evenly arranged in the region of 0~0.3L of air return lane side, first hole horizontal section
With 5~10m of air return lane horizontal distance；
Longitudinal direction, selects the cloth hole in the medium ground for being located at fissure zone middle and upper part, and construction depth of stratum should be not less than 3m；Together
The main aperture section of one drilling is arranged in as far as possible in a rock stratum, not across rock drilling layer；2~3 drillings close to air return lane are arranged in
Gush out gas in low level rock stratum to control face upper corner angle and goaf, remaining drilling is arranged in high-order rock stratum to control
Adjacent layer and this coal seam gush out gas.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110991081A (en) * | 2019-12-19 | 2020-04-10 | 中国矿业大学 | Method for determining extracted gas quantity of adjacent layer based on ground drilling extracted gas |
| CN113323715A (en) * | 2021-06-11 | 2021-08-31 | 中煤科工集团西安研究院有限公司 | Hard roof strong mine pressure and goaf gas disaster cooperative treatment method |
| CN114961689A (en) * | 2022-06-15 | 2022-08-30 | 淮北工业建筑设计院有限责任公司 | Method for designing well position of ground drilling for extracting coal bed gas in annular fracture ring of goaf |
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| CN107120137A (en) * | 2017-07-12 | 2017-09-01 | 安徽理工大学 | A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method |
| CN105804786B (en) * | 2016-03-15 | 2017-12-01 | 安徽理工大学 | A kind of weak seam bottom plate layer-through drilling pressure rushes anti-reflection method |
| CN107740677A (en) * | 2017-09-22 | 2018-02-27 | 中煤科工集团西安研究院有限公司 | A kind of broken soft seam concordant directional long borehole gas pumping method for crossing working face |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468177A (en) * | 2015-08-14 | 2017-03-01 | 六盘水师范学院 | A kind of coal and gas harmonic extraction method |
| CN105804786B (en) * | 2016-03-15 | 2017-12-01 | 安徽理工大学 | A kind of weak seam bottom plate layer-through drilling pressure rushes anti-reflection method |
| CN107083988A (en) * | 2017-06-27 | 2017-08-22 | 中国矿业大学(北京) | Mining induced fissure band gas pumping technical method based on km directional drilling |
| CN107120137A (en) * | 2017-07-12 | 2017-09-01 | 安徽理工大学 | A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110991081A (en) * | 2019-12-19 | 2020-04-10 | 中国矿业大学 | Method for determining extracted gas quantity of adjacent layer based on ground drilling extracted gas |
| CN110991081B (en) * | 2019-12-19 | 2023-06-16 | 中国矿业大学 | Method for determining gas extraction amount of adjacent layer based on gas extraction of ground drilling |
| CN113323715A (en) * | 2021-06-11 | 2021-08-31 | 中煤科工集团西安研究院有限公司 | Hard roof strong mine pressure and goaf gas disaster cooperative treatment method |
| CN114961689A (en) * | 2022-06-15 | 2022-08-30 | 淮北工业建筑设计院有限责任公司 | Method for designing well position of ground drilling for extracting coal bed gas in annular fracture ring of goaf |
| CN114961689B (en) * | 2022-06-15 | 2024-05-03 | 淮北工业建筑设计院有限责任公司 | Design method for ground drilling well position for coal bed gas extraction of annular fracture ring of goaf |
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