CN105952492B - A kind of high gas layer working face drilling Gas pre-drainage method - Google Patents
A kind of high gas layer working face drilling Gas pre-drainage method Download PDFInfo
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- CN105952492B CN105952492B CN201610357774.9A CN201610357774A CN105952492B CN 105952492 B CN105952492 B CN 105952492B CN 201610357774 A CN201610357774 A CN 201610357774A CN 105952492 B CN105952492 B CN 105952492B
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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
Abstract
A kind of high gas layer working face drilling Gas pre-drainage method, belongs to coal seam drilling Gas pre-drainage method.It is anti-reflection to carry out release for first one layer of ultra-thin coal seam of drilling in coal seam; crossheading arranges twist bit this working face of drilling and subsequent work face above and below first mining face; drilling excavate so that around drilling hole rock stratum generate loosen and cranny development and combined under casing protection effect drainage tube using high water filling material by gap filling between drilling hole and drainage tube after form drilling extraction concentric holes, wait for that after the completion of face up and down trough all concentric holes arrangement drilling Gas pre-drainage can be implemented；Drilling ultra-thin coal seam leads to cranny development after making drilling hole aperture ambient stress that country rock be concentrated to be plastically deformed so that the adsorption capacity of coal-bed gas declines, and it is 5 times of drilling pore radius to obtain gas to dilute effective radius by theoretical calculation.The recovery method of the head mining height gassy seams is reliable, simple for process, is easy to implement the safe working of first mining height gassy seam.
Description
Technical field
The present invention relates to a kind of coal seam drilling Gas pre-drainage method, especially a kind of high gas layer working face drilling is taken out in advance
Gas method.
Background technology
By high tension coal mining for many years, shallow-layer coal resources are gradually exhausted, and coal mining enters deep, especially economic phase
To flourishing central and east mining area, main force's mine has developed to the middle and later periods, and main body mining depth has reached 800m or more, local mining depth
Portion has reached 1500m.Since mining depth is big, crustal stress, gas pressure and content are big, and coal and gas prominent, impact occur for mine
The possibility of the dynamic disasters accidents such as mine pressure increases, it has also become the key for restricting deep coal resources safety exploitation urgent need to resolve is asked
Topic.And the girdle protective layer that first mash gas pressure is small, content is low, degree of danger is low is used, protected coal seam above and below release
High stress, parsing low air permeability coal seam adsorption gas, have been produced and facts have proved to be the one of safety and high efficiency deep fractures group
Kind effective means.Traditional protective coat extracted makes a large amount of gas pressure reliefs pour in protective layer working face, easily causes watt
This transfinites or other gas accidents, and《Safety regulations in coal mine》198th article of regulation, when exploiting close distance protected seam,
It must take measures to prevent that the gas of protected seam initial stage release pours in protective layer working face suddenly.And use spiral drilling very thin
Protective layer can effectively solve the problem that the problem of existing protection films exploitation causes gas pressure relief to pour in protected seam, to solve to protect tradition shield
Problem caused by layer exploitation, invents a kind of high gas layer working face drilling Gas pre-drainage method.
Invention content
The invention aims to provide a kind of high gas layer working face drilling Gas pre-drainage method, traditional protection is solved
Caused by release initial stage a large amount of gas pour in protective layer working face in layer recovery process the problem of major accident.
Technical solution：To achieve the above object, the technical solution of the method for the present invention：Crossheading auger above and below first mining face
The method for arranging of machine method for arranging and drainage holes；
Crossheading arranges one layer of pole in twist bit this working face of drilling and subsequent work face i.e. above and below first mining face
Girdle progress release is anti-reflection, and drilling, which is excavated, so that rock stratum generates loosening and cranny development around drilling hole, therefore in drilling
It first buries drainage tube and will be between drilling hole and drainage tube using high water filling material under casing protection effect in hole centre position
Drilling extraction concentric holes are formed after gap filling, wait for that after the completion of all concentric holes arrangements of face up and down trough drilling can be implemented
Gas pre-drainage.
The twist bit method for arranging of crossheading up and down：
(1) crossheading arranges auger drilling ultra-thin coal seam to first mining face up and down；
(2) crossheading only arranges this working face of twist bit drilling on；
(3) crossheading arranges twist bit, this working face of one side drilling under；On the other hand also working face under drilling；
(4) play the role of shielding to the driving in subsequent work face；
(5) arrangement for being arranged as drainage holes of crossheading drilling machine provides place up and down.
(6) method is arranged the arrangement of twist bit to other working faces according to this, forms high gas layer working face and takes out in advance
Gas method.
The drainage holes method for arranging：
(1) drilling hole is formed after drilling；
(2) after state of surrounding rock is stablized, the float coal of a small amount of remaining in drilling hole is cleared up, and depth when according to spiral drilling
And angle, in drilling hole centre position, early period first buries gas pumping pipeline, and divides into casing；
(3) under casing protection effect, using high water filling material by shape after gap filling between drilling hole and drainage tube
At drilling extraction concentric holes；
(4) arrangement of concentric holes forms high gas layer working face safety and high efficiency method.
Drilling Gas pre-drainage method, specific stages of mining are as follows：
Step 1：Crossheading arranges twist bit above and below first mining face, and for safety drilling, first mining face tilts length
Degree is general to be required to be less than 120m；Crossheading arranges that drilling machine creeps into 40m to this working face on working face, and crossheading is arranged under working face
On the one hand drilling machine creeps into 80m to this working face, be on the other hand not less than the distance between 40m, drilling to next working face drilling
For 2~3m；The advantages of this arrangement, is that the safety during the driving of subsequent work face can be screened.
Step 2：It is provided according to the relevant design of step 1, in high gas layer face up and down trough, using auger
The ultra-thin coal seam of coalcutter drilling 0.3m or so, in order to form the preferable concentric holes of extraction quality, around auger simultaneously
Arrangement high*.water packing equipment is filled in time；
Step 3：After spiral drilling, drilling surrounding terrane stress redistribution.By calculating, along drilling pore radius side
Coverage to circumferential direct stress is about ρ=5a, and in formula, a is drilling pore radius, and it is about 5 that gas, which discharges effective radius,
Drilling pore radius again；
Step 4：Clear up the float coal of a small amount of remaining in drilling hole after drilling, and depth when according to spiral drilling with
Angle, early period first bury gas pumping pipeline；
Step 5：According to the size in drilling hole, casing protection gas pumping pipe is installed, screw thread will press from both sides between pipe nipple when installation
Raw material band is simultaneously tightened, and drilling spillage occurs when preventing filling and casing protruded length cannot be more than 100mm；
Step 6：Using high-water material, rapid reinforcement casing and fill gas pumping pipe and casing, casing and drilling hole it
Between gap；
Step 7：The drilling hole that i.e. gas pumping pipe is excavated with early period after the completion of filling forms concentric holes, carries out gas
Extraction.
As the above scheme is adopted：First face up and down trough arrange twist bit drilling 0.3m ultra-thin coal seams into
Row release, and setting of casing and the concentric drainage holes of utilization filling technique arrangement on the basis of drilling hole.Therefore to first mining height gas
The exploitation in coal seam provides reliable infrastructural support.General auger bit diameter is 80cm, so radius is around drilling hole
2m range gas pumping effects are more preferable, simple for process, are easy to implement the safe working of first mining height gassy seam.Solves traditional guarantor
Caused by release initial stage a large amount of gas pour in protective layer working face in sheath recovery process the problem of major accident, this hair is reached
Bright purpose.
Advantage：
1, existing protection films exploitation release initial stage a large amount of gas are avoided and pour in major accident caused by protective layer working face.
2, for deep high gas layer, using drilling hole and drainage holes concentric arrangement due to country rock around drilling hole
Plastic deformation occurs to generate crack therefore be more conducive to the release extraction of coal-bed gas.
3, drilling hole and drainage holes arranged concentric, greatly reduce quantities and have saved production cost.
4, crossheading can be released effectively the gas in subsequent work face to next working face drilling under this working face, it is ensured that under
The safety that crossheading tunnels on one working face.
5, drilling hole and drainage holes concentric arrangement can also be used for using when projecting coal bed tunnelling.
Description of the drawings：
Fig. 1 is the drilling working face arrangement schematic diagram of the present invention.
Fig. 2 a are that crossheading drilling forms extraction drilling concentric holes schematic diagram on the working face of the present invention.
Fig. 2 b be the present invention working face under crossheading drilling formed extraction drilling concentric holes schematic diagram.
Fig. 2 c are that the face up and down trough drilling of the present invention forms extraction drilling concentric holes sectional view.
Fig. 3 is the drilling ambient stress distribution schematic diagram of the present invention.
Fig. 4 is the arrangement schematic diagram of the drainage tube of the present invention.
In figure, 1, fixed oil cylinder；2, auger type coalcutter；3, oblique adjusting oil cylinder；4, formula drilling rod is saved；5, drainage tube；6, it bores
Adopt hole；7, high-water material；8, casing.
Specific implementation mode
The technical solution of the method for the present invention：The arrangement of crossheading twist bit method for arranging and drainage holes above and below first mining face
Method；Crossheading arranges twist bit this working face of drilling and one layer of very thin coal seam in subsequent work face i.e. above and below first mining face
It is anti-reflection that layer carries out release, and drilling is excavated so that rock stratum generates and loosens and cranny development around drilling hole, therefore in drilling hole
Between position first bury drainage tube and under casing protection effect using high water filling material by gap between drilling hole and drainage tube
Drilling extraction concentric holes are formed after filling, drilling can be implemented after the completion of face up and down trough all concentric holes arrangement by waiting for takes out in advance
Gas；Drilling ultra-thin coal seam leads to cranny development after making drilling hole aperture ambient stress that country rock be concentrated to be plastically deformed, and makes
The adsorption capacity of coal-bed gas declines, it is 5 times of drilling pore radius to obtain gas to dilute effective radius by theoretical calculation.
The twist bit method for arranging of crossheading up and down：
(1) crossheading arranges auger drilling ultra-thin coal seam to first mining face up and down；
(2) crossheading only arranges this working face of twist bit drilling on；
(3) crossheading arranges twist bit, this working face of one side drilling under；On the other hand also working face under drilling；
(4) play the role of shielding to the driving in subsequent work face；
(5) arrangement for being arranged as drainage holes of crossheading drilling machine provides place up and down；
(6) method is arranged the arrangement of twist bit to other working faces according to this, forms high gas layer working face and takes out in advance
Gas method.
The drainage holes method for arranging：
(1) drilling hole is formed after drilling；
(2) after state of surrounding rock is stablized, the float coal of a small amount of remaining in drilling hole is cleared up, and depth when according to spiral drilling
And angle, in drilling hole centre position, early period first buries gas pumping pipeline, and divides into casing；
(3) under casing protection effect, using high water filling material by shape after gap filling between drilling hole and drainage tube
At drilling extraction concentric holes；
(4) arrangement of concentric holes forms high gas layer working face safety and high efficiency method.
Drilling Gas pre-drainage method, specific stages of mining are as follows：
Step 1：Crossheading arranges twist bit above and below first mining face, and for safety drilling, first mining face tilts length
Degree is general to be required to be less than 120m；Crossheading arranges that drilling machine creeps into 40m to this working face on working face, and crossheading is arranged under working face
On the one hand drilling machine creeps into 80m to this working face, be on the other hand not less than the distance between 40m, drilling to next working face drilling
For 2~3m；The advantages of this arrangement, is that the safety during the driving of subsequent work face can be screened.
Step 2：It is provided according to the relevant design of step 1, in high gas layer face up and down trough, using auger
The ultra-thin coal seam of coalcutter drilling 0.3m or so, in order to form the preferable concentric holes of extraction quality, around auger simultaneously
Arrangement high*.water packing equipment is filled in time；
Step 3：After spiral drilling, drilling surrounding terrane stress redistribution.By calculating, along drilling pore radius side
Coverage to circumferential direct stress is about ρ=5a, and in formula, a is drilling pore radius, and it is about 5 that gas, which discharges effective radius,
Drilling pore radius again；
Step 4：Clear up the float coal of a small amount of remaining in drilling hole after drilling, and depth when according to spiral drilling with
Angle, early period first bury gas pumping pipeline；
Step 5：According to the size in drilling hole, casing protection gas pumping pipe is installed, screw thread will press from both sides between pipe nipple when installation
Raw material band is simultaneously tightened, and drilling spillage occurs when preventing filling and casing protruded length cannot be more than 100mm；
Step 6：Using high-water material, rapid reinforcement casing and fill gas pumping pipe and casing, casing and drilling hole it
Between gap；
Step 7：The drilling hole that i.e. gas pumping pipe is excavated with early period after the completion of filling forms concentric holes, carries out gas
Extraction.
Embodiment 1：Crossheading arranges twist bit above and below first mining face, and for safety drilling, first mining face tilts
Length generally requires to be less than 120m；Crossheading arranges that drilling machine creeps into 40m, the crossheading cloth under working face to this working face on working face
Set drilling machine on the one hand to this working face creep into 80m, on the other hand to next working face drilling be not less than 40m, between drilling away from
From for 2~3m, as shown in Fig. 1.
It is different from traditional spiral drilling girdle, the present invention is directed high gas layer, in face up and down trough,
Using the ultra-thin coal seam of auger coal mining machine drilling 0.3m or so, in order to form the preferable concentric holes of extraction quality, in spiral shell
Around rotary drill and arrange that high*.water packing equipment is filled in time.
Due to trepanning, drilling hole ambient stress is caused to concentrate, passes through drilling hole known to the stress distribution analysis around device to hole
There is a certain range of tensile stress so rock stratum will will produce certain crack around drilling hole in surrounding, this crack is beneficial to extraction
Gas.
The float coal of a small amount of remaining after drilling work is completed in cleaning drilling hole, and depth when according to spiral drilling with
Angle, early period first bury gas pumping pipeline.
According to the size in drilling hole, casing protection gas pumping pipe is installed, screw thread wants half-cooked material strip between pipe nipple when installation
And tighten, drilling spillage occurs when preventing filling.And casing protruded length cannot be more than 100mm.
Before carrying out high water and reinforcing casing, the setting angle for measuring casing is needed, high water lines are connected after being measured,
Casing is fastened with drilling machine, around progress high*.water packing casing behind practical inclination angle and the suitably adjustment of design difference and drilling hole
Gap.First with high-water material being filled inside and outside casing, start after starting to return out high water in casing double using cement-waterglass
Liquid is reinforced, and concentration of sodium silicate uses 40 ° of Be, the volume ratio 1 of cement mortar and waterglass：0.5, wait for the seam between orifice tube and drilling
Gap has biliquid to start have biliquid to start to overflow in spilling or aperture, then gradually extracts casing, starts blow wash grouting pump, note
Ensure that outer wall is water-tight after slurry.
After above-mentioned steps, then foring drainage holes and drainage holes surrounding rock, broken there are crack, gas adsorption energy
Power declines, and is beneficial to gas pumping.
Claims (4)
1. a kind of high gas layer working face drilling Gas pre-drainage method, it is characterized in that：Crossheading is conducive to spiral shell to first mining face up and down
Rotary drill machine drill adopts carry out release, and the method for arranging of extraction is carried out using drilling hole：
I.e. above and below first mining face crossheading arrange one layer of twist bit drilling head mining faces and subsequent work face it is very thin
Coal seam progress release is anti-reflection, and drilling, which is excavated, so that rock stratum generates loosening and cranny development around drilling hole, therefore in drilling hole
It first buries drainage tube and will be stitched between drilling hole and drainage tube using high water filling material under casing protection effect in centre position
Drilling extraction concentric holes are formed after gap filling, waiting for can be real after the completion of all drilling extraction concentric holes of face up and down trough are arranged
Apply drilling Gas pre-drainage.
2. a kind of high gas layer working face drilling Gas pre-drainage method according to claim 1, it is characterized in that：Described
Upper and lower crossheading twist bit method for arranging：
（1）Crossheading arranges twist bit drilling ultra-thin coal seam to first mining face up and down；
（2）Upper crossheading only arranges twist bit drilling head mining faces；
（3）Lower crossheading arranges twist bit, one side drilling head mining faces；On the other hand also drilling subsequent work face；
（4）Play the role of shielding to the driving in subsequent work face；
（5）The arrangement for being arranged as drilling extraction concentric holes of upper and lower crossheading drilling machine provides place；
（6）Other working faces according to this method carry out twist bit arrangement, formed high gas layer working face drilling Gas pre-drainage
Method.
3. a kind of high gas layer working face drilling Gas pre-drainage method according to claim 1, it is characterized in that：Described
Drilling extraction concentric holes method for arranging：
（1）Drilling hole is formed after drilling；
（2）After state of surrounding rock is stablized, the float coal of a small amount of remaining in drilling hole is cleared up, and according to the depth and angle in drilling hole,
In drilling hole centre position, early period first buries gas pumping pipeline, and divides into casing；
（3）Under casing protection effect, it will be formed and bored after gap filling between drilling hole and drainage tube using high water filling material
Adopt extraction concentric holes；
（4）The arrangement of drilling extraction concentric holes forms high gas layer working face safety and high efficiency method.
4. a kind of high gas layer working face drilling Gas pre-drainage method described in claim 1, it is characterized in that：The pre- pumping watt of drilling
This method, specific stages of mining are as follows：
Step 1：Crossheading arranges twist bit above and below first mining face, and for safety drilling, first mining face tilt length is wanted
It asks and is less than 120m；Crossheading arranges that drilling machine creeps into 40m to this working face on working face, and crossheading arranges one side of drilling machine under working face
80m is crept into towards this working face, is on the other hand not less than 40m to next working face drilling, the distance between drilling is 2 ~ 3m；This
The advantages of kind arrangement, is that the safety during the driving of subsequent work face can be screened；
Step 2：It is provided according to the relevant design of step 1, in high gas layer face up and down trough, using spiral drill shearer
Machine drill adopts the ultra-thin coal seam of 0.3m or so, in order to form the preferable drilling extraction concentric holes of extraction quality, in auger week
Cloth is set high*.water packing and is filled in time；
Step 3：After spiral drilling, drilling surrounding terrane stress redistribution；By calculating, along drilling pore radius direction ring
It is about to the coverage of direct stress, in formula, a is drilling pore radius, and it is about 5 times that gas, which discharges effective radius,
Drilling pore radius；
Step 4：The float coal of a small amount of remaining in drilling hole is cleared up after drilling, and according to the depth and angle in drilling hole, early period
First bury gas pumping pipeline；
Step 5：According to the size in drilling hole, casing protection gas pumping pipe is installed, screw thread wants half-cooked material between pipe nipple when installation
Band is simultaneously tightened, and drilling spillage occurs when preventing filling and casing protruded length cannot be more than 100mm；
Step 6：Using high water filling material, rapid reinforcement casing and fill gas pumping pipe and casing, casing and drilling hole it
Between gap；
Step 7：The drilling hole that i.e. gas pumping pipe is excavated with early period after the completion of filling forms drilling extraction concentric holes, carries out
Gas pumping.
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| CN106382131A (en) * | 2016-11-17 | 2017-02-08 | 攀枝花煤业（集团）有限责任公司 | Device for embedding gas draining sleeve in coal mining working surface |
| CN107489443A (en) * | 2017-08-22 | 2017-12-19 | 西南交通大学 | Toxic and harmful gas constructing tunnel hydrogen sulfide mash gas harnessing method |
| CN112127941B (en) * | 2020-09-27 | 2023-04-07 | 山西鑫桥科技有限公司 | Method for solving coal seam gas outburst |
| CN113464138B (en) * | 2021-07-27 | 2024-03-29 | 辽宁煤科矿业产品制造有限公司 | Coiled tubing water production equipment and technology for non-thin-layer-capable-of-production-protection coal bed |
| CN117266855B (en) * | 2023-11-23 | 2024-01-19 | 太原理工大学 | Pressure relief and permeability improvement method and system for ultrathin layered mining of coal seam |
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| RU1809115C (en) * | 1990-10-30 | 1993-04-15 | С.П.Щеголев, Н.И.Турушев и Б.А.Ишин | Method to control gas emission by district retreating longwall heading without pillar stopping |
| CN104100292B (en) * | 2014-07-31 | 2017-04-12 | 山西潞安环保能源开发股份有限公司 | Regional forced gas extraction method for single low-permeability outburst thick coal seam |
| CN104533512A (en) * | 2014-12-16 | 2015-04-22 | 中鼎国际工程有限责任公司 | Construction method for preventing and treating gas outburst in coal roadway heading process |
| CN104632272A (en) * | 2015-01-29 | 2015-05-20 | 西安科技大学 | 'Three-soft' low-breathability work surface rib shallow hole gas extraction method |
| CN104832209A (en) * | 2015-04-04 | 2015-08-12 | 西安科技大学 | Roadway advanced borehole diversion drainage goaf gas technology |
| CN104847401A (en) * | 2015-04-30 | 2015-08-19 | 贵州盘江精煤股份有限公司 | Regional coal and gas outburst coal seam coal face outburst preventing and controlling method |
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