CN116378747A - Broken soft coal seam coal roadway strip gas control method without uncovering coal - Google Patents
Broken soft coal seam coal roadway strip gas control method without uncovering coal Download PDFInfo
- Publication number
- CN116378747A CN116378747A CN202310327073.0A CN202310327073A CN116378747A CN 116378747 A CN116378747 A CN 116378747A CN 202310327073 A CN202310327073 A CN 202310327073A CN 116378747 A CN116378747 A CN 116378747A
- Authority
- CN
- China
- Prior art keywords
- coal
- hole
- roadway
- drilling
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 253
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 112
- 238000000605 extraction Methods 0.000 claims abstract description 49
- 238000010276 construction Methods 0.000 claims abstract description 33
- 239000011435 rock Substances 0.000 claims abstract description 30
- 230000005641 tunneling Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 11
- 230000000149 penetrating effect Effects 0.000 abstract description 11
- 239000007789 gas Substances 0.000 description 64
- 239000011148 porous material Substances 0.000 description 7
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a method for controlling gas in a coal roadway of a broken soft coal seam without uncovering coal, which adopts an alternate hole forming technology of hydraulic rock penetrating and pneumatic coal penetrating to construct comb-shaped directional drilling holes of a bottom plate of the broken soft coal seam, main holes of the comb-shaped directional drilling holes are formed in a bottom plate rock layer and parallel to the coal seam, branch holes on the main holes enter the coal seam from the rock layer and extend along the direction of the coal roadway along the coal seam, and a screen pipe protecting hole is arranged for gas extraction after hole forming. The invention can realize the strip gas extraction control without uncovering coal, reduces the drilling construction amount, realizes the rapid, safe and low-cost coal roadway strip gas control, reduces the gas early warning or outburst risk and ensures the engineering safety.
Description
Technical Field
The invention belongs to the field of underground tunnel drilling of coal mines and coal and gas control engineering, and particularly relates to a method for controlling gas in a coal roadway strip of a crushed soft coal layer.
Background
Along with the requirements of efficient and safe production of coal mines, gas control problems and the like are increasingly prominent, and the underground directional long drilling holes of the coal mines have the advantages of being accurate and controllable in large hole depths and tracks, so that the method is widely applied and is an extremely effective gas control means. At present, the hydraulic screw motor is widely applied to the rock stratum and the hard coal seam in a directional drilling way, and the developed pneumatic screw drilling tool directional drilling technology and matched equipment gradually enter the engineering application stage aiming at the problem that the hydraulic directional drilling in the crushed soft coal seam cannot form holes. At present, the conventional method for advanced treatment of the coal roadway tunneling of the crushed soft coal seam is to tunnel a bottom plate roadway firstly, then construct a large number of layer-penetrating holes in the bottom plate roadway to pre-pump and eliminate the outburst of coal roadway strip gas, and the tunneling time of the bottom plate roadway is long, the difficulty is high and the cost is high; the factors of large work load of layer-penetrating drilling, low coal penetrating rate and the like greatly reduce the gas extraction efficiency and the coal mine production safety. The gas control technology for the coal seam directional long drilling coal roadway strips based on the pneumatic directional drilling technology needs to be constructed in a coal roadway after coal uncovering, and the hole forming depth often cannot meet the requirement when drilling meets a complex structural belt. Therefore, it is necessary to provide a coal roadway strip gas treatment method based on directional long drilling without uncovering coal, hydraulic directional drilling and pneumatic directional drilling are constructed on a coal seam bottom plate upwards along the coal roadway tunneling direction to alternately form comb-shaped branch holes, hydraulic directional drilling is adopted in a bottom plate rock stratum to form holes, pneumatic directional drilling is adopted in a coal seam after coal is put into the holes, and all the branch holes are overlapped in the coal seam, so that the coal roadway strip gas extraction treatment without uncovering coal and with complex structure is realized, the bottom plate roadway and the layer penetrating drilling are replaced, the strip gas treatment efficiency is greatly improved, the gas treatment cost is reduced, the actual requirements of broken soft coal layer gas treatment are met, and the safe and efficient production of coal mines is ensured.
At present, the gas extraction and outburst elimination of a crushed soft coal seam coal roadway strip area mainly adopts the technical scheme that a bottom plate roadway is pre-excavated, a layer penetrating drill hole is constructed upwards in the bottom plate roadway to pre-extract gas or a long directional drill hole along a coal seam is utilized to perform gas extraction and outburst elimination after coal uncovering, wherein the coal roadway to be excavated is required to be positioned in a pressure relief area of the pre-excavated bottom plate roadway. The prior art has the following defects:
(1) When the floor rock roadway is pre-excavated, the distance between the floor rock roadway and the coal roadway to be excavated can be changed due to the large fluctuation of the coal seam, so that the difficulty in controlling the distance between the coal roadway to be excavated and the pressure relief area of the floor roadway is high.
(2) The layer-penetrating drilling holes are required to be arranged in a fan-shaped mode in the full-section area of the coal roadway to be dug, the number of the construction drilling holes is large, single-hole control precision is poor, the whole pre-pumping period is long, and efficiency is low.
(3) And the tunneling speed of the bottom plate stone drift is low, the engineering quantity is large, and the treatment cost is high and the period is long.
(4) For the broken soft coal seam coal roadway which does not meet the coal uncovering condition, the directional long drilling holes along the coal seam cannot be directly constructed.
(5) Conventional hydraulic directional drilling techniques are not capable of constructing long directional boreholes in crushed soft coal seams.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a method for controlling the strip gas of a broken soft coal layer coal roadway without uncovering coal, which adopts a hydraulic rock penetrating and pneumatic coal penetrating alternate pore forming technology to construct comb-shaped directional branch holes of a bottom plate of the broken soft coal layer, the comb-shaped directional branch holes enter the coal layer from the bottom plate, the comb-shaped directional branch holes are constructed along the coal roadway strip along the coal layer, and the gas extraction is carried out in a coal hole Duan Shaiguan guard hole, so that the aim of controlling the strip gas extraction is realized without uncovering the coal.
In order to solve the technical problems, the invention adopts the following technical scheme:
a broken soft coal seam coal roadway strip gas control method without uncovering coal comprises the following steps:
pore-forming: drilling holes in an upward construction rock stratum section by utilizing hydraulic directional drilling in a bottom plate roadway drilling field, extending the construction coal stratum section along the direction of a coal roadway strip by utilizing ventilation dynamic directional drilling after entering a coal seam, and retracting the rock stratum section drilling holes and continuing to construct a rock stratum section main hole by utilizing hydraulic directional drilling when the construction along the coal seam cannot be continued and the length of the drilling holes along the coal seam is not longer than the length requirement of the coal roadway strip; repeating the hydraulic directional drilling to upwards construct the rock stratum section drilling and the pneumatic directional drilling to along the coal seam construction coal seam section drilling to obtain branch holes until the along-coal-seam drilling length reaches the requirement of being greater than the coal roadway strip length; finally obtaining a main hole of the stratum section and a plurality of branch holes extending upwards to the stratum section, wherein the main hole and the plurality of branch holes on the main hole form comb-shaped directional drilling holes;
a lower screen pipe: before the construction of each branch hole is finished and the construction of the next branch hole is finished, a branch Kong Shaiguan is needed to be put into the branch hole, and a branch Kong Shaiguan is put into the bottom of the branch hole in a hydraulic screen pipe mode in a drill rod and hung at the bottom of the hole so as to ensure the smoothness of a coal seam section drilling gas extraction channel; after the construction of the last branch hole is finished, the main hole is downwards inserted into the main Kong Shaiguan;
and (3) gas extraction: and after the main hole sieve tube is put into the main hole sieve tube, the main hole sieve tube is immediately sealed, and a negative pressure extraction pipeline is connected to carry out gas extraction treatment, so that the gas pressure and the gas content in the area of the coal roadway strip region are reduced to a safe range, thereby eliminating the gas disaster risk during the coal roadway tunneling of the outburst coal seam and realizing rapid and safe tunneling.
The invention also comprises the following technical characteristics:
specifically, the length of the coal seam along the drilling hole is required to be 30-50 m longer than the length of the coal roadway strip.
Specifically, the main holes are positioned in the floor strata 3-6 m away from the coal seam.
Specifically, no extraction dead zone exists between adjacent branch holes on the same main hole, namely, the difference value between the coal depth of the next branch hole and the final hole depth of the last branch hole is smaller than the extraction range.
Specifically, the comb-shaped directional drilling areas are 15m on two sides of a coal roadway to be dug, and the distance between two adjacent groups of comb-shaped directional drilling holes is 5-6 m.
Specifically, the aperture of the comb-shaped directional drilling hole is not smaller than 90mm, and the rock stratum section drill bit is larger than the coal stratum section drilling hole size.
Specifically, the vertical distance between the floor roadway drilling site and the coal seam is within 20 m.
Specifically, the length of the branch hole sieve tube section is 2-3 m greater than the depth of the branch hole coal hole section where the branch hole sieve tube section is positioned.
Specifically, the whole process of drilling gas extraction is required to be monitored, the mixed flow, the pure flow and the total extraction amount are monitored, after extraction, the drilling is checked for the construction of the coal roadway strip area, and the gas extraction effect is checked.
Compared with the prior art, the invention has the following technical effects:
(1) The invention realizes the gas treatment of the coal roadway strips by hole instead of roadway along the coal seam lapping and pore forming of the comb-shaped branch holes of the bottom plate of the crushed soft protruding coal seam.
(2) The invention adopts the hydraulic rock penetrating and pneumatic coal penetrating alternate pore forming technology to construct comb-shaped directional branch pores of the bottom plate of the crushed soft coal layer, enters the coal bed from the bottom plate, is constructed along the coal roadway strips along the coal bed, and carries out gas extraction in the coal pore Duan Shaiguan guard hole, thereby realizing the directional long-drilling coal roadway strip gas treatment method under the condition that the crushed soft protruding coal bed is not uncovered, and guaranteeing the disaster prevention safety.
(3) Compared with the traditional floor roadway and layer-penetrating drilling strip gas control method, the invention saves the floor roadway, reduces the drilling construction amount, and realizes quick, safe and low-cost coal roadway strip gas control. Compared with the method for controlling the gas along the coal seam after uncovering the coal, the method reduces the gas early warning or outburst risk and ensures the engineering safety.
Drawings
FIG. 1 is a schematic cross-sectional view of a coal roadway strip area floor comb hole arrangement;
FIG. 2 is a plan view of a coal roadway strip zone floor comb hole arrangement;
FIG. 3 is a schematic diagram of the distribution of the branch hole and main hole gas drainage sieve tube.
Reference numerals meaning: 1. coal seam, branch hole, main hole, bottom plate drill site, coal roadway to be excavated, untreated area, branch Kong Shaiguan, main Kong Shaiguan, B1, first branch point, B2, second branch point, B3, third branch point; l, the length of the coal hole section of the branch hole, h, the distance from the main hole to the bottom of the coal bed.
Detailed Description
The invention provides a method for realizing the control of broken soft coal layer coal roadway strip gas by utilizing the lap joint of a bottom plate comb-shaped directional branch hole along a coal seam based on the combination of a coal mine underground hydraulic directional drilling technology and a pneumatic directional drilling technology. When the coal uncovering condition is not met or the coal seam is extremely broken and soft, multi-structure and the like, the comb-shaped holes of the bottom plate are constructed in the direction of the strip of the coal roadway in the bottom plate drilling site, and gas pre-extraction is carried out in the strip area, so that the gas pressure and the gas content in the area are reduced to a safe range, and safe and efficient tunneling is realized. According to the invention, the coal seam bottom plate in the strip area is subjected to the extraction treatment of the strip gas of the coal roadway by using a group of bottom plate comb-shaped directional long drilling holes, and the coal uncovering is not needed. The crushed soft coal layer generally cannot be subjected to construction of directional long drilling holes by utilizing a hydraulic directional drilling technology or the depth of holes is smaller than 100m, and the pneumatic directional drilling technology under the coal mine is required to be adopted to construct gas extraction directional long drilling holes in the coal layer.
The following specific embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solutions of the present application fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1 to 3, the present embodiment provides a method for controlling gas in a coal roadway of a crushed soft coal seam without uncovering the coal, fig. 1 is a schematic cross-sectional view of a coal roadway along which the present invention is arranged, fig. 2 is a plan view of a coal roadway area, and fig. 3 is a distribution schematic of a screen. As shown in the figure, the method for controlling the gas extraction of the bottom plate comb-shaped directional Kong Sui soft coal seam coal roadway strips adopts a hydraulic rock penetrating and pneumatic coal penetrating alternate pore forming technology to construct bottom plate comb-shaped directional holes, and realizes the gas pre-extraction control function of the coal roadway to be excavated through the main holes and the branch holes at one time. The branch holes enter a coal roadway to perform gas extraction and pressure relief, and all the coal seam sections of the branch holes in the main hole are overlapped front and back, namely, the distance between the depth of coal seen by the next branch hole and the depth of the final hole of the last branch hole is smaller than or equal to the drilling extraction radius, so that no blind area is ensured in gas extraction. The main holes provide gas extraction main channels for the branch holes, and after gas extraction is carried out through the main holes and the branch holes with enough quantity in the coal roadway strip area, the gas pressure and the gas content in the coal roadway strip area range are reduced to a safe range, so that the gas disaster risk during coal roadway tunneling of the outburst coal seam is eliminated, and quick and safe tunneling is realized.
In the embodiment, holes are formed upwards in a floor rock stratum drilling field, a certain distance is extended to enter a coal seam to be dug, then the coal seam is drilled along the coal roadway direction, when the broken soft degree or other structures of the coal seam cannot extend along the coal seam continuously, the coal seam is retracted to a main hole of the rock stratum to open branch holes to continue to enter the coal seam for drilling, and the coal seam is reciprocated circularly until the designed coal roadway strip length is covered. After the branch holes are formed, before the next branch hole is formed, the branch coal hole section L needs to be covered with a screen pipe to protect holes, so that the holes are prevented from being blocked after the coal holes collapse, and the smoothness of the gas channels of the coal hole section is ensured.
According to directional drilling deflecting characteristics, the vertical distance between a roadway where the hole opening position is positioned and a coal seam to be dug is not more than 20m, and meanwhile, the construction position is ensured to be outside an allowable safety distance, and the depth of a first coal inlet hole is ensured to be not more than 100m, namely, the invalid hole section area is ensured to be not more than 100m.
As shown in FIG. 2, the hole distribution range is generally the strip width of 15m at two sides of a coal roadway to be dug, the number of the drilled holes is determined according to the drilling extraction radius, and the number of the drilled holes is generally 7 holes, and the hole spacing is 5-6 m. Wherein, a drilling hole is arranged on the center line of the coal roadway to be excavated. The covering length of the primary hole distribution is generally not less than 300m so as to meet the requirements of the related area outburst elimination safety regulations.
Adjacent branch holes of each main hole are required to be lapped in the coal seam so as not to leave a drainage blind area, namely, the difference value between the coal depth of the next branch hole and the final hole depth of the last branch hole is smaller than the drainage range, and the coverage of the area without the blind area is ensured.
The branch hole coal Kong Duanxu is used for screen pipe protection, the screen pipe is immediately arranged after the end hole of the branch hole, the length of the screen pipe section is not less than L+2m, namely the length delta L of the exposed coal hole section is not less than 2m, the open end of the screen pipe is ensured to be positioned in a stable rock hole and not blocked by coal, and meanwhile, the construction of the main hole and the next branch hole is not influenced.
The bottom plate comb Kong Zhukong is generally positioned at the position of the coal seam bottom plate with the height h=3-6 m from the coal seam, so that the drilling holes can be positioned in stable rock strata, and the requirements of branch construction can be met.
In this embodiment, the regional gas control effect is required to be checked before the coal roadway is driven, and the coal roadway is driven after the regional effect check shows no prominent danger. The effect test needs to be performed in-situ sampling, so that the accuracy of test parameters is ensured.
The invention discloses a method for controlling gas in a broken soft coal seam coal roadway without uncovering coal, which specifically comprises the following steps:
step one, pore forming: drilling holes in an upward construction rock stratum section by utilizing hydraulic directional drilling in a bottom plate roadway drilling field, extending the construction coal seam section along the direction of a coal roadway strip by utilizing ventilation dynamic directional drilling after entering a coal seam, and when the construction along the coal seam cannot be continued and the length of the drilling holes along the coal seam is not greater than the length requirement of the coal roadway strip, returning to a proper branching point of the drilling holes in the rock stratum section and constructing a main hole of the rock stratum section forward by utilizing hydraulic directional drilling; repeating the hydraulic directional drilling to upwards construct the rock stratum section drilling and the pneumatic directional drilling to along the coal seam construction coal seam section drilling to obtain branch holes until the along-coal-seam drilling length reaches the requirement of being greater than the coal roadway strip length; finally obtaining a main hole of the coal seam section and a plurality of branch holes extending upwards to the coal seam section, wherein the track of the main hole is parallel to the coal seam, and the main hole and the plurality of branch holes on the main hole form comb-shaped directional drilling holes; specifically, due to the drilling characteristics of the crushed soft coal seam, sectional construction is needed in comb-shaped directional drilling construction, namely, water is used as a medium in a stratum section, and a hydraulic screw motor is used for directional drilling and hole forming; after entering the coal seam, the coal seam section adopts air or nitrogen as a medium, and a pneumatic screw motor is used for directional drilling and hole forming; when the hole is drilled by pneumatic drilling, wind blowing is firstly carried out on the water construction section, so that drying in the hole is ensured, and air deslagging is ensured.
Specifically, the length of the coal seam along the drilling hole is required to be 30-50 m longer than the length of the coal roadway strip. The main hole is positioned in the bottom plate rock stratum 3-6 m away from the coal seam so as to ensure enough climbing distance of the drill hole, and the main hole is a main channel for extracting Kong Zuowei gas. The branching points of the plurality of branch holes on each main hole are determined according to the broken soft condition, the structure and the like of the coal seam, and each branch hole extends along the coal seam as far as possible. The adjacent branch holes on the same main hole are in seamless lap joint to ensure that no blind area is left, and the depth of the coal seam reached by the previous branch hole can reach the depth of the coal seen by the next branch hole. The area of comb-shaped directional drilling arrangement is 15m respectively at two sides of a coal roadway to be dug, the plane hole arrangement distance is determined according to the extraction radius of the target coal seam drilling, and the distance between two adjacent groups of comb-shaped directional drilling is 5-6 m; the aperture of the comb-shaped directional drilling hole is not smaller than 90mm, and is generally 96mm or 108mm; and the rock stratum section drill bit is larger than the drilling size of the coal stratum section so as to ensure enough slag discharging channels. The vertical distance between the bottom plate roadway drilling site and the coal seam is within 20m, so that the ineffective depth of the drilling climbing section is reduced as much as possible.
Second step, lower screen pipe: before the construction of each branch hole is finished and the construction of the next branch hole, the branch hole is needed to be put in
The branch Kong Shaiguan and the branch Kong Shaiguan are put into the bottom of a branch hole in a hydraulic screen pipe-discharging mode in a drill pipe and are hung at the bottom of the hole, so that the smoothness of a gas extraction channel drilled in a coal seam section is ensured; after the construction of the last branch hole is finished, the main hole is also put into the main Kong Shaiguan; specifically, the length of the branch hole sieve tube is 2-3 m greater than the depth of the coal hole section of the branch hole where the branch hole sieve tube is positioned, so that the outer opening of the branch hole sieve tube is ensured to be positioned in a rock hole.
Thirdly, gas extraction: after the main hole sieve tube is put into the hole, hole sealing is carried out on the hole opening, the joint stubble is connected with a negative pressure extraction pipeline for gas extraction treatment, so that the gas pressure and the gas content in the area of the coal roadway strip are reduced to a safe range, the gas disaster risk during the coal roadway tunneling of the outburst coal seam is eliminated, and the rapid and safe tunneling is realized; the whole process of drilling gas extraction is required to be monitored, the mixed flow, the pure flow, the total extraction amount and the like are monitored, after the gas extraction is carried out for a certain time, the construction inspection drilling is carried out on the coal roadway strip area, and the gas extraction effect is inspected.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (9)
1. The method for controlling the gas of the broken soft coal seam coal roadway strips without uncovering the coal is characterized by comprising the following steps of:
pore-forming: drilling holes in an upward construction rock stratum section by utilizing hydraulic directional drilling in a bottom plate roadway drilling field, extending the construction coal stratum section along the direction of a coal roadway strip by utilizing ventilation dynamic directional drilling after entering a coal seam, and retracting the rock stratum section drilling holes and continuing to construct a rock stratum section main hole by utilizing hydraulic directional drilling when the construction along the coal seam cannot be continued and the length of the drilling holes along the coal seam is not longer than the length requirement of the coal roadway strip; repeating the hydraulic directional drilling to upwards construct the rock stratum section drilling and the pneumatic directional drilling to construct the coal stratum section drilling along the coal seam until the length of the coal seam drilling along the coal seam reaches the requirement of being greater than the length of the coal roadway strip; finally obtaining a main hole of the stratum section and a plurality of branch holes extending upwards to the stratum section, wherein the main hole and the plurality of branch holes on the main hole form comb-shaped directional drilling holes;
a lower screen pipe: before the construction of each branch hole is finished and the construction of the next branch hole is finished, a branch Kong Shaiguan is needed to be put into the branch hole, and a branch Kong Shaiguan is put into the bottom of the branch hole in a hydraulic screen pipe mode in a drill rod and hung at the bottom of the hole so as to ensure the smoothness of a coal seam section drilling gas extraction channel; after the construction of the last branch hole is finished, the main hole is downwards inserted into the main Kong Shaiguan;
and (3) gas extraction: and after the main hole sieve tube is put into the main hole sieve tube, the main hole sieve tube is immediately sealed, and a negative pressure extraction pipeline is connected to carry out gas extraction treatment, so that the gas pressure and the gas content in the area of the coal roadway strip region are reduced to a safe range, thereby eliminating the gas disaster risk during the coal roadway tunneling of the outburst coal seam and realizing rapid and safe tunneling.
2. The method for controlling the gas of the coal roadway strips of the broken soft coal seam without uncovering coal as claimed in claim 1, wherein the length of the coal seam along the drilling hole is required to be 30-50 m greater than the length of the coal roadway strips.
3. The method for controlling gas in a coal roadway stripe of a broken soft coal seam without uncovering coal as recited in claim 1, wherein said main hole is located in a floor strata 3-6 m from the coal seam.
4. The method for controlling the gas of the broken soft coal seam coal roadway strips without uncovering coal according to claim 1, wherein no extraction dead zone exists between adjacent branch holes on the same main hole, namely, the difference value between the coal-seeing depth of the next branch hole and the final hole depth of the last branch hole is smaller than the extraction range.
5. The method for controlling the gas of the broken soft coal seam coal roadway strips without uncovering coal according to claim 1, wherein the area where the comb-shaped directional drilling holes are arranged is 15m on two sides of the coal roadway to be dug, and the distance between two adjacent groups of comb-shaped directional drilling holes is 5-6 m.
6. The method for controlling gas in a coal roadway strip of a broken soft coal seam without uncovering coal as claimed in claim 1, wherein the aperture of the comb-shaped directional drilling hole is not less than 90mm, and the drilling hole of the stratum section is larger than the drilling hole size of the coal seam section.
7. The method for controlling the gas of broken soft coal seam coal roadway strips without uncovering coal as recited in claim 1, wherein the vertical distance between the bottom plate roadway drilling site and the coal seam is within 20 m.
8. The method for controlling the gas of broken soft coal seam coal roadway strips without uncovering coal according to claim 1, wherein the length of the branch hole sieve tube section is 2-3 m greater than the depth of the branch hole coal hole section where the branch hole sieve tube section is positioned.
9. The method for controlling the gas of the broken soft coal seam coal roadway strips without uncovering coal according to claim 1, wherein the gas extraction of the drilled holes is monitored in the whole process, the mixed flow, the pure flow and the total extraction amount are monitored, and after the extraction, the construction inspection drilled holes are formed in the coal roadway strip areas, and the gas extraction effect is inspected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310327073.0A CN116378747A (en) | 2023-03-30 | 2023-03-30 | Broken soft coal seam coal roadway strip gas control method without uncovering coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310327073.0A CN116378747A (en) | 2023-03-30 | 2023-03-30 | Broken soft coal seam coal roadway strip gas control method without uncovering coal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116378747A true CN116378747A (en) | 2023-07-04 |
Family
ID=86972554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310327073.0A Pending CN116378747A (en) | 2023-03-30 | 2023-03-30 | Broken soft coal seam coal roadway strip gas control method without uncovering coal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116378747A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116556966A (en) * | 2023-07-07 | 2023-08-08 | 山西凯嘉能源集团有限公司 | Roadway driving method for precisely eliminating coal roadway driving coal and gas outburst |
-
2023
- 2023-03-30 CN CN202310327073.0A patent/CN116378747A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116556966A (en) * | 2023-07-07 | 2023-08-08 | 山西凯嘉能源集团有限公司 | Roadway driving method for precisely eliminating coal roadway driving coal and gas outburst |
| CN116556966B (en) * | 2023-07-07 | 2023-09-19 | 山西凯嘉能源集团有限公司 | Roadway driving method for precisely eliminating coal roadway driving coal and gas outburst |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018201706A1 (en) | Method for efficient gas drainage in coal roadway strips and regional outburst elimination through staged fracturing with long borehole floor beddings | |
| CN111206933A (en) | Tunnel construction method for traversing karst water-rich section | |
| CN111594258A (en) | Technical method for quickly extracting gas to reach standard by using broken soft low-permeability outburst coal seam instead of roadway through holes | |
| CN106869966B (en) | A kind of method for blocking of absciss layer water supply source | |
| CN111140279B (en) | Method for preventing and treating old empty water on thick coal seam under condition of repeated mining caused by small kiln damage to layering | |
| CN111878079B (en) | Method for treating gas of soft outburst coal seam of underground large mining length working face of coal mine | |
| CN110439579B (en) | Advanced pre-grouting method for open-type TBM (tunnel boring machine) water-rich tunnel | |
| CN102116169A (en) | Drainage method for pressure-relief gas baseboard stonehead of protected seam | |
| CN112343647B (en) | Method for preventing and controlling self-discharging pressure-eliminating outburst-eliminating rapid tunneling gas of adjacent air tunnel | |
| CN109000525A (en) | A kind of shield driving upper-soft lower-hard ground presplit blasting construction method | |
| CN116378747A (en) | Broken soft coal seam coal roadway strip gas control method without uncovering coal | |
| CN112377241B (en) | Roof extraction roadway cross-layer drilling and presplitting blasting combined multi-branch directional hole extraction method | |
| CN111396118A (en) | Coal seam group rapid rock cross-cut coal uncovering outburst eliminating method | |
| CN112377243A (en) | Outburst prevention construction method for coal and gas outburst tunnel | |
| CN112012746A (en) | Construction method of railway tunnel deep and large vertical shaft under condition of thick-layer water-rich broken zone | |
| CN207620794U (en) | The soil body composite reinforcing structure of the existing subway of weak soil shield crossing | |
| CN112879045B (en) | Method for building deep-buried huge-thickness solution gap fracture aquifer curtain | |
| CN115929295A (en) | Method for fluidized advanced excavation coal body roadway coal uncovering | |
| CN115199269A (en) | Multi-disaster integrated prevention and control method for island outburst coal seam strong and weak coupling structure | |
| CN114607833A (en) | Vertical curve downward-penetrating construction method for rectangular jacking pipe meeting obstacle | |
| CN211058801U (en) | Piece flows stratum tunnel excavation construction structures | |
| CN114483163A (en) | Gas extraction method | |
| RU2097568C1 (en) | Method of degassing worked-out spaces of mine fields | |
| CN116591697B (en) | Construction method for normal-pressure cutter changing based on shield in coastal region | |
| CN110985017A (en) | Construction method for penetrating rainwater box culvert under expansive soil stratum shield |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |