CN109296395A - The outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head - Google Patents
The outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head Download PDFInfo
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- CN109296395A CN109296395A CN201811294907.8A CN201811294907A CN109296395A CN 109296395 A CN109296395 A CN 109296395A CN 201811294907 A CN201811294907 A CN 201811294907A CN 109296395 A CN109296395 A CN 109296395A
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- mechanized mining
- mining working
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The present invention relates to coal mining technology fields, provide a kind of outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head.Drilling drills along direct rimrock layer to main roof strata direction from bottom to top close to coal column side in tunnel；Pressure break, high pressure water is injected into hole to direct rimrock layer direction along main roof strata using water injection pipe, the water outlet of the water injection pipe, which first rests on, fills the water setting time in main roof strata, then it moves down setting spacing and fills the water setting time, setting spacing is moved down again and fills the water setting time, until main roof strata and the lamination of direct rimrock are split.Intercommunicating pore is drilled in direct rimrock layer and main roof strata, hole is located proximate to coal column, the interval injection high pressure water into hole, successively main roof strata and the lamination of direct rimrock are split and be caving by the pressure of high pressure water, the space of fully-mechanized mining working air return lane is filled up, so that gas is dispersed drift, realizes the effect for reducing gas density.
Description
Technical field
The present invention relates to coal mining technology fields, more particularly to a kind of outstanding top gas exceeding limit control of fully-mechanized mining working faces end head
Method processed.
Background technique
The U-shaped long-armed fully-mechanized mining working spontaneous caving method management top plate of ventilation is currently that China's coal-mine coal mining is mainly selected
Coal winning technology.The generally existing outstanding top span length of two heading head region top plate of China's coal-mine coal working face is difficult to sufficiently collapse in time
Since the instantaneous inbreak of large span thick-layer top plate may cause fully-mechanized mining working various types of peace occurs for the engineering roadblock fallen
Full hazardous accidents, air return lane gas at upper corner often occur especially for highly gassy mine fully-mechanized mining working seriously transfinites and restricts
The Prevention Techniques problem such as Safety of Coal Mine Production.
The U-shaped ventilation fully-mechanized mining working of long-wall mining manages top plate using spontaneous caving method, above and below two lane of coal working face
End top plate leads to not sufficiently be caving along coal column lateral wall due to being limited by entity coal rock layer, causes two heading head of working face
It hangs top and closely knit goaf can not be filled, and then cause fully-mechanized mining working return aircourse upper corner gas exceeding limit calamity frequent occurrence
Evil, the safe working that threaten working face is seriously restricted especially for highly gassy mine.Corner on fully-mechanized mining working air return lane end
The essential reason of angle gas exceeding limit is to be easy to migrate upwards much smaller than atmospheric density due to gas density to gather upper corner sky
Between region, but essence be due to after working face mining air return lane end regions top plate fail in time be sufficiently caving it is backfilled enclosed mined out
Area provides Space, Place so finally migrating to gather for gas.
Existing method is using explosive blasting or hydraulic fracture technology, to control the outstanding top of two heading crown plate of coal working face
Too long engineering roadblock is to keep its abundant inbreak filling coal mining empty by cutting off the direct rimrock layer of two heading head region of working face
Between, lane space is occupied using the direct rimrock layer of inbreak, and gas is forced to reach its concentration of reduction without migration accumulation place, but
Underground coal mine practice have shown that, be difficult to guarantee its nature by self weight is real only by being intended to split direct rimrock layer it being made to wait for that working face is pushed through
It is sufficiently caving and closely knit closure goaf, fully-mechanized mining working air return lane gas at upper corner is still frequently present of asking of seriously transfiniting
Topic.
Summary of the invention
(1) technical problems to be solved
It is existing comprehensive to solve the object of the present invention is to provide a kind of outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head
The problem of outstanding top gas of mining working faces end head seriously transfinites.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of outstanding top gas exceeding limit controlling parties of fully-mechanized mining working faces end head
Method includes the following steps:
Drilling drills along direct rimrock layer to main roof strata direction from bottom to top close to coal column side in tunnel；
Pressure break injects high pressure water, the water injection pipe into hole to direct rimrock layer direction along main roof strata using water injection pipe
Water outlet first rest on and fill the water setting time in main roof strata, then move down setting spacing and fill the water setting time, then
It is secondary to move down setting spacing and fill the water setting time, until main roof strata and the lamination of direct rimrock are split.
Wherein, it in the drill process, drills from bottom to top along direct rimrock layer to main roof strata inclination set angle.
Wherein, the set angle is 30-50 °.
Wherein, in the drill process, interval is moved towards along tunnel and is drilled with multiple holes.
Wherein, the spacing in two neighboring hole is 8~10m.
Wherein, in the drill process, hole is 0~1m at a distance from coal column.
Wherein, in the fracturing step, the water inlet end of the water injection pipe is connect with high pressure water-injection pump, and the water injection pipe goes out
Water end (W.E.) is equipped with hole packer.
Wherein, in the fracturing step, spacing is set as 3~5m.
Wherein, in the fracturing step, high pressure water is injected into hole, after high-pressure water pressure is stablized, continues injection setting
The high pressure water of time, setting time are 25-35 minutes.
(3) beneficial effect
The outstanding top gas exceeding limit control method of a kind of fully-mechanized mining working faces end head provided by the invention, in direct rimrock layer and old top
Intercommunicating pore is drilled in rock stratum, hole is located proximate to coal column, and the interval injection high pressure water into hole successively will by the pressure of high pressure water
Main roof strata and the lamination of direct rimrock are split and are caving, and the space of fully-mechanized mining working air return lane is filled up, and gas is made to disperse drift, real
Now reduce the effect of gas density.
Detailed description of the invention
Fig. 1 is the construction schematic diagram of the embodiment of the present invention；
Fig. 2 is the construction effect figure of the embodiment of the present invention.
In figure, 1: direct rimrock layer；2: main roof strata；3: coal column；4: tunnel；5: hole.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In addition, in the description of the present invention, unless otherwise indicated, " multiple ", " more ", " multiple groups " be meant that two or
Two or more, " several ", " several ", " several groups " are meant that one or more.
As shown in Figure 1, the embodiment of the present invention provides a kind of outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head, including
Following steps:
Drilling drills along direct rimrock layer 1 to 2 direction of main roof strata from bottom to top close to 3 side of coal column in tunnel 4；
Pressure break injects high pressure water into hole to direct 1 direction of rimrock layer along main roof strata 2 using water injection pipe, water injection pipe
Water outlet, which first rests on, fills the water setting time in main roof strata 2, then move down setting spacing and fill the water setting time, again
It moves down setting spacing and fills the water setting time, until main roof strata 2 and direct 1 pressure break of rimrock layer.
Further, it in drill process, constructs in tunnel 4, at 3 0~1m of side of coal column, with drilling machine edge from bottom to top
Direct rimrock layer 1 drills to 2 direction of main roof strata, and drilling machine is convenient in the tunnel of narrow space 4 along inclination set angle drilling
Operating device, set angle is 30-50 °, specifically, drilling machine round end is contacted with direct rimrock layer 1, drilling machine inclination successively exists
Direct rimrock layer 1 and 2 internal drilling of main roof strata, hole 5 are integrated connection and are obliquely installed.
Wherein, interval being moved towards along tunnel 4 and being drilled with multiple holes 5, the spacing in two neighboring hole 5 is 8~10m, and the depth in hole 5 is
30~50m, can be according to the physical length in tunnel and number, spacing and the depth of rock stratum constituent structure providing holes 5.
Further, in fracturing step, water injection pipe is set, the water inlet end of water injection pipe is connect with high pressure water-injection pump, is infused in hole 5
The water outlet of water pipe is equipped with hole packer, and high pressure water is injected into hole to direct 1 direction of rimrock layer along main roof strata 2, high pressure water
Pressure is 10~50MPa, and the water outlet of water injection pipe, which first rests on, fills the water setting time in main roof strata 2, then moves down and sets
Fixed spacing sets spacing as 3~4m, after high-pressure water pressure is stablized, continues the high pressure water for injecting setting time, setting time is
25-35 minutes, setting spacing was moved down again and fills the water setting time, until main roof strata 2 and direct 1 pressure break of rimrock layer,
Specifically, injecting high pressure water to 5 bottom of hole, i.e. 2 part of main roof strata by water injection pipe, after high-pressure water pressure is stablized, continue to infuse
Enter the high pressure water of setting time, stop water filling, move down 3~5m, continue to fill the water, is successively filled to water filling in hole 5 and completes.
Wherein, hole packer expands under the pressure effect for flowing through high pressure water herein, and the hole packer after expansion and hole 5 seal
Cooperation, prevents high pressure water by the gap side leakage between hole packer and hole 5, influences fracturing effect, after stopping water filling, hole packer is extensive
Shape is restored, hole packer is moved easily.
As shown in Fig. 2, successively drill according to above method step, and to each hole hydraulic fracturing, make direct rimrock layer and old
The inbreak of rimrock layer and enrich and fill up lane space, and then prevent gas density from transfiniting.
In one example, drilling machine selects ZDY1200S drilling machine, bit diameter 56mm, drill pipe diameter 42mm, in distance
At the 0.5m of coal column side drill, boring direction be along direct rimrock layer to main roof strata from bottom to top, tilt angle be 50 °, along
8 holes are arranged in the interval of moving towards in tunnel, and the spacing in two neighboring hole is 9m, and the depth in hole is 40m；
The water outlet of water injection pipe is fixedly connected with hole packer, and is arranged in hole, protrudes into the hole bottom in main roof strata, fills the water
The water inlet end of pipe is fixedly connected with high pressure water-injection pump, opens high pressure water-injection pump and fills the water to bottom hole, and hole packer forced expansion is realized with hole
Sealing continues injection high pressure water 30 minutes after high-pressure water pressure is stablized, and closes high pressure water-injection pump, and hole packer restores to the original state, edge
Main roof strata moves down 3m to direct rimrock layer direction, repeats above-mentioned water-filling method, until completing interval note to entire hole
Water completes the hydraulic fracturing step in a hole, successively carries out hydraulic fracturing to all holes.
The outstanding top gas exceeding limit control method of a kind of fully-mechanized mining working faces end head provided by the invention, in direct rimrock layer and old top
Intercommunicating pore is drilled in rock stratum, hole is located proximate to coal column, and the interval injection high pressure water into hole successively will by the pressure of high pressure water
Main roof strata and the lamination of direct rimrock are split and are caving, and the space of fully-mechanized mining working air return lane is filled up, and gas is made to disperse drift, real
Now reduce the effect of gas density.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head, which comprises the steps of:
Drilling drills along direct rimrock layer to main roof strata direction from bottom to top close to coal column side in tunnel；
Pressure break injects high pressure water into hole to direct rimrock layer direction along main roof strata using water injection pipe, and the water injection pipe goes out
Water end (W.E.), which first rests on, fills the water setting time in main roof strata, then moves down setting spacing and fills the water setting time, again to
Lower mobile setting spacing simultaneously fills the water setting time, until main roof strata and the lamination of direct rimrock are split.
2. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as described in claim 1, which is characterized in that the drilling
In step, drill from bottom to top along direct rimrock layer to main roof strata inclination set angle.
3. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as claimed in claim 2, which is characterized in that the setting
Angle is 30-50 °.
4. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as described in claim 1, which is characterized in that the drilling
In step, interval is moved towards along tunnel and is drilled with multiple holes.
5. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as claimed in claim 4, which is characterized in that two neighboring
The spacing in hole is 8~10m.
6. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as described in claim 1, which is characterized in that the drilling
In step, hole is 0~1m at a distance from coal column.
7. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as described in claim 1, which is characterized in that the pressure break
In step, the water inlet end of the water injection pipe is connect with high pressure water-injection pump, and the water outlet of the water injection pipe is equipped with hole packer.
8. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as described in claim 1, which is characterized in that the pressure break
In step, spacing is set as 3~5m.
9. the outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head as claimed in claim 8, which is characterized in that the pressure break
In step, high pressure water is injected into hole, after high-pressure water pressure is stablized, continues the high pressure water for injecting setting time, setting time
It is 25-35 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811294907.8A CN109296395A (en) | 2018-11-01 | 2018-11-01 | The outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head |
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| CN201811294907.8A CN109296395A (en) | 2018-11-01 | 2018-11-01 | The outstanding top gas exceeding limit control method of fully-mechanized mining working faces end head |
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Application publication date: 20190201 |