CN102322285B - Coal seam water infusion device with high ground pressure, low porosity and low permeability and using process thereof - Google Patents
Coal seam water infusion device with high ground pressure, low porosity and low permeability and using process thereof Download PDFInfo
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Abstract
The invention relates to a coal seam water infusion device with high ground pressure, low porosity and low permeability, which comprises a static pressure water infusion device and a dynamic pressure water infusion device. The static pressure water infusion device comprises a static pressure water infusion supply pipe, a static pressure main pipeline stop valve, a first differential pressure type penetrant continuous and quantitative adding pump, a static pressure flow divider, a static pressure branch pipeline, a static pressure branch pipeline stop valve and a static pressure flow meter. The dynamic pressure water infusion device comprises a dynamic pressure water infusion supply pipe, a water storage tank, a second differential pressure type penetrant continuous and quantitative adding pump, a water return pipe, a water infusion pump, a water quality filter, a pressure gauge, a dynamic pressure main pipeline stop valve, a dynamic pressure flow divider, a dynamic pressure branch pipeline, a dynamic pressure branch pipeline stop valve and a dynamic pressure flow meter.
Description
Technical field
The present invention relates to coal face diaster prevention and control field, relate in particular to water filling device and operation thereof that porosity low-permeability coal seam is forced down on a kind of highland.
Background technology
Along with the increase of China's coal-mine mining depth and the raising of mechanical mining degree, the extent of injury of the natural calamities such as coal dust, bump and ground temperature is constantly upgraded, disaster accident frequently occurs, and the safety and high efficiency of China's coal-mine and underground labour's physical and mental health in serious threat.Coal-bed flooding is the important technical of the multiple disaster of control mine.Dust-producing amount in the time of can effectively reducing the coal body fragmentation by coal-bed flooding prevents the generation of impulsion pressure, coal and Gas Outburst disaster, and by increasing the coefficient of thermal conductivity of coal body, reduces coal temperature, the prevention Period of Coal Seam Spontaneous Combustion.In addition, coal-bed flooding can be softened hard coal body, and drawing speed is accelerated, and improves producing coal amount and efficient.But, the coal seam in the more mining area of China is that porosity low-permeability coal seam is forced down on the highland, coal body joint fissure agensis and comparatively hard, the coal-bed flooding difficulty, and existing water injection technology exists more deficiency and limitation, cause the water injection rate of work plane limited, can not reach the diaster prevention and control effect of expection.For this reason, this area is badly in need of a kind of highland and is forced down porosity low-permeability coal seal water-infusion technology and device, improves flood effectiveness, forces down the difficult problem of preventing and treating of the disasters such as porosity low-permeability seam mining Coal During dirt, bump and high temperature with effective alleviation highland.
In the prior art, CN101539028A discloses a kind of pulsed infusion method and equipment, use equipment makes water injection pressure change produce the pulsatile impact coal seam, but its water injection pressure changes very fast, be unfavorable for the water infiltration colliery, and its equipment configuration is complicated, thereby fault rate is higher, also can't be used for the static pressure water filling simultaneously; CN101161992A discloses a kind of coal-bed flooding method, and what it mainly adopted is the static pressure water filling, there is no the impact function of dynamical pressure water infusion, and it does not disclose concrete water filling device and water injection technology step.
Summary of the invention
Force down porosity coal-bed flooding hard problem in order effectively to solve the highland, the present invention proposes the device that a kind of highland is forced down porosity seam-wave dynamic formula water injection technology and implemented this technique.This process and apparatus structure are simple, easy operating, and water injection rate is large, can effectively prevent and treat the generation of the disaster accidents such as seam mining Coal During dirt, bump and high temperature.
The technical solution adopted in the present invention is as follows:
Porosity low-permeability coal seam water infusion device is forced down on a kind of highland, is used for to one or more water injection hole water fillings, comprises static pressure water filling device, dynamical pressure water infusion device,
described static pressure water filling device comprises static pressure water filling feed pipe, static pressure main pipe rail stop valve, the first differential bleeding agent continuous and quantitative adds pump, the static pressure current divider, static pressure divides pipeline, static pressure divides pipeline stop valve and static pressure flowmeter, described static pressure main pipe rail stop valve is connected on static pressure water filling feed pipe, the described first differential bleeding agent continuous and quantitative adds parallel connection of pumps and is connected on static pressure water filling feed pipe and between described static pressure main pipe rail stop valve and described static pressure current divider, the quantity of described static pressure current divider is identical with the quantity of water injection hole, be connected on described static pressure water filling feed pipe and be positioned at the downstream of described static pressure main pipe rail stop valve, each static pressure current divider connects a static pressure and divides pipeline, each static pressure divides pipeline to be in series with a static pressure flow meter and a static pressure divides the pipeline stop valve,
described dynamical pressure water infusion device comprises the dynamical pressure water infusion feed pipe, storage tank, the second differential bleeding agent continuous and quantitative adds pump, return pipe, water injecting pump, water filter, pressure meter, dynamic pressure main pipe rail stop valve, the dynamic pressure partial device, dynamic pressure divides pipeline, dynamic pressure divides pipeline stop valve and dynamic pressure flowmeter, the described second differential bleeding agent continuous and quantitative adds parallel connection of pumps and is connected on described dynamical pressure water infusion feed pipe, described storage tank, described water filter, described water injecting pump, described pressure meter, described dynamic pressure main pipe rail stop valve is connected in series on the dynamical pressure water infusion feed pipe successively, described return pipe is connected between described water injecting pump and described storage tank, the quantity of described dynamic pressure partial device is identical with the quantity of water injection hole, be connected on described dynamical pressure water infusion feed pipe and be positioned at the downstream of described dynamic pressure main pipe rail stop valve, each dynamic pressure partial device connects a dynamic pressure and divides pipeline, each dynamic pressure divides pipeline to be in series with a dynamic pressure flowmeter and a dynamic pressure divides the pipeline stop valve.
Use the coal seal water-infusion technology of said apparatus to be: take 1～6 water injection hole as one group, water injection hole adopts hole packer and the loose associating sealing of hole of Mary, according to the coal seam pressure condition, adopt dynamical pressure water infusion technique, dynamic pressure district's employing static pressure water injection technology in static pressure district, coal-face coal seam, dynamical pressure water infusion technique uses dynamical pressure water infusion device, static pressure water injection technology to use the static pressure water filling device, water injection pipe in each water injection hole is connected respectively each minute pipeline in corresponding water filling device, make water inject the coal seam.
Described dynamical pressure water infusion technique is that high pressure exceedes and splits fluctuation-type dynamical pressure water infusion technique, comprises the following steps:
1. described one group of 1～6 water injection hole is connected to the dynamical pressure water infusion device;
2. add bleeding agent and improve the ability that water penetrates into coal body in water, be to inject the water of 1～3h under the state of 0.8～1 times of coal seam vertical stress to the coal seam at hydraulic pressure, the inner hydraulic blow phenomenon that forms in the coal seam, force the inner original occlude crack in coal seam to be communicated with each other or directly form new fracture network in the coal seam, exceeding in inside, coal seam and split, expand and make water be penetrated into the coal body inside hole-fracture network that is mutually related;
3. when water injection pressure has obvious reduction, progressively reduce water filling and be depressed into a minimum pressure values, described minimum pressure values is 1～3 times of static pressure water injection pressure, when under described minimum pressure duty pressure, water injection rate obviously reduces or annotate when not intaking in the coal seam, again water injection pressure is progressively raised, inject the coal seam inner, to form new hydraulic blow phenomenon;
4. repeating step 2.-3., until the digging requirement is satisfied in coal seam, water filling district or water injection hole enters dynamic pressure district, coal seam.
Described static pressure water injection technology comprises the steps:
Described one group of 1～6 water injection hole connection static pressure water filling device with the dynamic pressure district;
After the static pressure water filling begins, open static pressure main pipe rail stop valve and static pressure and divide the pipeline stop valve, a part of water in static pressure water filling feed pipe adds pump through the first differential bleeding agent continuous and quantitative, bleeding agent is pressed in static pressure water filling feed pipe, and flow into water injection pipe after mixing with another part water, enter in the coal seam.
When water injection hole changes the static pressure water filling into, choose again the adjacent water injection hole in 1～6, static pressure district, work plane coal seam and connect the dynamical pressure water infusion device, carry out dynamical pressure water infusion, after the water injection hole that carries out dynamical pressure water infusion enters work plane dynamic pressure district, change again the static pressure water filling into, successively repeatedly, thus form the pattern that static pressure district, coal-face coal seam dynamical pressure water infusion, dynamic pressure district's static pressure water filling carry out simultaneously.
The invention has the beneficial effects as follows:
A kind of highland provided by the invention is forced down porosity low-permeability coal seal water-infusion technology and device and is effectively exceeded in inside, coal seam to split, expanded and can make water be penetrated into the coal body inside hole-fracture network that is mutually related, and greatly improved by bleeding agent the ability that water penetrates into coal body, obviously improved water injection rate.Through on-the-spot probationary certificate, the method and apparatus structure are simple, easy operating, maintenance workload is less, water injection rate has improved 2～4 times, effectively reduces the temperature of work plane and the possibility that bump occurs, and has reduced the dust-producing amount in the exploitation, and extended the spontaneous combustion period in coal seam, effectively alleviated the difficult problem of preventing and treating that the disasters such as porosity low-permeability seam mining Coal During dirt, bump and high temperature are forced down on the highland.
Description of drawings
Fig. 1 is the dynamical pressure water infusion structural representation that porosity low-permeability coal seal water-infusion technology and device are forced down in a kind of highland.
Fig. 2 is that the static pressure water filling of porosity low-permeability coal seal water-infusion technology and device and the structural representation that dynamical pressure water infusion carries out are simultaneously forced down in a kind of highland.
In figure: 1-dynamical pressure water infusion feed pipe; The 2-the second differential bleeding agent continuous and quantitative adds pump; 3-storage tank; 4-water filter; 5-water injecting pump; 6-return pipe; 7-pressure meter; 8-dynamic pressure main pipe rail stop valve; 9-dynamic pressure partial device; 10-dynamic pressure divides the pipeline stop valve; 11-dynamic pressure flowmeter; 12-Mary is loose; 13-hole packer; 14-water injection pipe; 15-work water injection hole; 16-standby water injection hole; 17-static pressure water filling feed pipe; The 18-the first differential bleeding agent continuous and quantitative adds pump; 19-static pressure main pipe rail stop valve; 20-coal seam; The 21-static pressure divides the pipeline stop valve; 22-static pressure flow meter; 23-static pressure current divider.
The specific embodiment
Referring to accompanying drawing 1, it has shown the work schematic diagram that static pressure district, coal seam is carried out dynamical pressure water infusion.
Press measurement result to determine dynamic pressure district and the static pressure district (also referred to as the virgin stress district) in coal-face coal seam according to the ore deposit in coal-face coal seam, the virgin stress district arranges 1 water injection hole every 10～25m in the work plane coal seam, the length of water injection hole is 1/2～2/3 of face length, the aperture is 40～80mm, and angle and coal seam angle are basically identical.With water injection pipe) insert in water injection hole, end 1～3 joint of water injection pipe is floral tube, install 1 hole packer at distance water injection hole entrance 6～15m place, the Mary who injects preparation by a certain percentage between hole packer and water injection hole entrance is loose, and is excessive from water injection hole with the water that prevents from injecting.
In the established water injection hole in static pressure district, coal-face coal seam, choosing 1～6 water injection hole is one group, forms work water injection hole group, and the present invention connects the dynamical pressure water infusion device take 4 water injection holes as example, and all the other water injection holes of having accomplished fluently are standby water injection hole.After dynamical pressure water infusion begins, open dynamic pressure main pipe rail stop valve and dynamic pressure and divide the pipeline stop valve, and the pressure of adjusting water injecting pump, make water injection pressure reach 0.8～1 times of coal seam vertical stress, water part process in the dynamical pressure water infusion feed pipe is added pump with the second differential bleeding agent continuous and quantitative that the dynamical pressure water infusion feed pipe is in parallel, a certain amount of bleeding agent is pressed in the dynamical pressure water infusion feed pipe, with enter storage tank after another part water mixes by a certain percentage, and be inhaled into water injecting pump through after water filter.Suck the water of water injecting pump, divide pipeline stop valve and dynamic pressure flowmeter to flow into water injection pipe through pressure meter, dynamic pressure main pipe rail stop valve, dynamic pressure partial device, dynamic pressure successively after pressurization, enter in the coal seam, if enter the water yield in water injection pipe less than the draining metered flow of water injecting pump, unnecessary water will turn back in storage tank by return pipe.
Regulate the pressure of water injecting pump, make hydraulic pressure inject the water of 1～3h to the coal seam under for the state of 0.8～1 times of coal seam vertical stress, new " water attack " phenomenon of inner formation in the coal seam, force the inner original occlude crack in coal seam to be communicated with each other or directly form new fracture network in the coal seam, namely exceed in inside, coal seam to split, expand and can make water be penetrated into the coal body inside hole-fracture network that is mutually related, the bleeding agent that adds in water will improve the ability that water penetrates into coal body greatly.when water injection pressure has obvious reduction (as being reduced to below 50% of normal water injection pressure), can think the fluctuation water under high pressure oneself forced to a great extent to link up coal seam preexisting crack net or innerly in the coal seam of certain limit formed new fracture network, at this moment, progressively reduce water filling and be depressed into a minimum pressure values, general this minimum pressure values is that the static pressure water injection pressure (can determine according to the parameter in work plane coal seam by the static pressure water injection pressure, it determines that mode is the common practise of this area) 1～3 times, when under minimum pressure, water injection rate obviously reduces (as being reduced to 35% when following of normal water injection rate) or annotate when not intaking in the coal seam, again water injection pressure is progressively raised, the injection coal seam is inner, to form new " water attack " phenomenon, then again progressively form static pressure water-wet coal body.So repeatedly, thus form high pressure exceedes and splits the fluctuation-type dynamical pressure water infusion in static pressure district, coal-face coal seam.
Propelling along with work plane, one group of water injection hole choosing will enter the dynamic pressure district in coal seam successively, the impact that adopted by work plane, the crack of water injection hole place coal body will be grown more, at this moment, need not to carry out dynamical pressure water infusion, the one group of water injection hole that enters the dynamic pressure district can have been changed into and connect static pressure water filling device (not shown).After the static pressure water filling begins, open static pressure main pipe rail stop valve and static pressure and divide the pipeline stop valve, a part of water process in static pressure water filling feed pipe is added pump with the first differential bleeding agent continuous and quantitative that static pressure water filling feed pipe is in parallel, a certain amount of bleeding agent is pressed in static pressure water filling feed pipe, and with divide pipeline stop valve and static pressure flowmeter to flow into water injection pipe through static pressure main pipe rail stop valve, static pressure current divider, static pressure successively after another part water mixes, enter in the coal seam.
Referring to accompanying drawing 2, it has shown the work schematic diagram that coal seam static pressure water filling and dynamical pressure water infusion carry out simultaneously.
After the one group of water injection hole that carries out dynamical pressure water infusion enters the dynamic pressure district, need to connect the static pressure water filling device and change the static pressure water filling into.Meanwhile, choose again the adjacent water injection hole in 1～6, static pressure district, work plane coal seam, one group 1～6 adjacent water injection hole is connected the dynamical pressure water infusion device, carrying out high pressure exceedes and splits the fluctuation-type dynamical pressure water infusion, after this group water injection hole enters work plane dynamic pressure district, then change the static pressure water filling into, choose again 1～6 water injection hole that is adjacent simultaneously and carry out dynamical pressure water infusion, successively repeatedly, thus form the pattern that static pressure district, coal-face coal seam dynamical pressure water infusion, dynamic pressure district's static pressure water filling carry out simultaneously.In the injecting process, add bleeding agent always, and, when occurring leaking, during the situation such as perspiration, can suspending water filling, carrying out again water filling after coal body is fully wetting by water, dynamic pressure district's water injection time and static pressure district water injection time all should not be less than 2d.
be understandable that, the above main pipe rail stop valve, current divider, divide the pipeline stop valve, flowmeter is all parts well known in the art, " dynamic pressure " and " static pressure " to its restriction is only to be arranged in different device in order to distinguish it, rather than to the restriction of its function, described differential bleeding agent continuous and quantitative adds pump can select common differential constant displacement pump, as long as it can satisfy quantitative interpolation bleeding agent, described " the porosity low-permeability is forced down on the highland " is that press fifty-fifty in relative coal seam, average void fraction and mean permeability, press fifty-fifty, average void fraction and mean permeability can be consulted calculating by the basic parameter in each coal seam.
The above; only be the better specific embodiment of patent of the present invention; but the protection domain of patent of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that patent of the present invention discloses; the variation that can expect easily or replacement are within all should being encompassed in the protection domain of patent of the present invention.
Claims (3)
1. porosity low-permeability coal seal water-infusion technology is forced down on a highland, is used for to one or more water injection hole water fillings, it is characterized in that, uses simultaneously static pressure water filling device, dynamical pressure water infusion device in described coal seal water-infusion technology,
described static pressure water filling device comprises static pressure water filling feed pipe, static pressure main pipe rail stop valve, the first differential bleeding agent continuous and quantitative adds pump, the static pressure current divider, static pressure divides pipeline, static pressure divides pipeline stop valve and static pressure flow meter, described static pressure main pipe rail stop valve is connected on static pressure water filling feed pipe, the described first differential bleeding agent continuous and quantitative adds parallel connection of pumps and is connected on static pressure water filling feed pipe and between described static pressure main pipe rail stop valve and described static pressure current divider, the quantity of described static pressure current divider is identical with the quantity of water injection hole, be connected on described static pressure water filling feed pipe and be positioned at the downstream of described static pressure main pipe rail stop valve, each static pressure current divider connects a static pressure and divides pipeline, each static pressure divides pipeline to be in series with a static pressure flow meter and a static pressure divides the pipeline stop valve,
described dynamical pressure water infusion device comprises the dynamical pressure water infusion feed pipe, storage tank, the second differential bleeding agent continuous and quantitative adds pump, return pipe, water injecting pump, water filter, pressure meter, dynamic pressure main pipe rail stop valve, the dynamic pressure partial device, dynamic pressure divides pipeline, dynamic pressure divides pipeline stop valve and dynamic pressure flowmeter, the described second differential bleeding agent continuous and quantitative adds parallel connection of pumps and is connected on described dynamical pressure water infusion feed pipe, described storage tank, described water filter, described water injecting pump, described pressure meter, described dynamic pressure main pipe rail stop valve is connected in series on the dynamical pressure water infusion feed pipe successively, described return pipe is connected between described water injecting pump and described storage tank, the quantity of described dynamic pressure partial device is identical with the quantity of water injection hole, be connected on described dynamical pressure water infusion feed pipe and be positioned at the downstream of described dynamic pressure main pipe rail stop valve, each dynamic pressure partial device connects a dynamic pressure and divides pipeline, each dynamic pressure divides pipeline to be in series with a dynamic pressure flowmeter and a dynamic pressure divides the pipeline stop valve,
in described water injection technology, coal-face is divided into static pressure district and dynamic pressure district, the district arranges 1 water injection hole every 10～25m at the work plane static pressure, take 1～6 water injection hole as one group, water injection hole adopts hole packer and the loose associating sealing of hole of Mary, according to the coal seam pressure condition, when being positioned at static pressure district, coal-face coal seam, adopts water injection hole dynamical pressure water infusion technique, adopt the static pressure water injection technology when being positioned at coal-face dynamic pressure district, dynamical pressure water infusion technique is used the dynamical pressure water infusion device, the static pressure water injection technology uses the static pressure water filling device, water injection pipe in each water injection hole is connected respectively each minute pipeline in corresponding water filling device, make water inject the coal seam,
When water injection hole changes the static pressure water filling into by dynamical pressure water infusion, choose again the adjacent water injection hole in 1～6, static pressure district, work plane coal seam and connect the dynamical pressure water infusion device, carry out dynamical pressure water infusion, after the water injection hole that carries out dynamical pressure water infusion enters work plane dynamic pressure district, change again the static pressure water filling into, successively repeatedly, thus form the pattern that static pressure district, coal-face coal seam dynamical pressure water infusion, dynamic pressure district's static pressure water filling carry out simultaneously.
2. coal seal water-infusion technology according to claim 1 is characterized in that: described dynamical pressure water infusion technique is that high pressure exceedes and splits fluctuation-type dynamical pressure water infusion technique, comprises the following steps:
1. described one group of 1～6 water injection hole is connected to the dynamical pressure water infusion device;
2. add bleeding agent and improve the ability that water penetrates into coal body in water, be to inject the water of 1～3h under the state of 0.8～1 times of coal seam vertical stress to the coal seam at hydraulic pressure, the inner hydraulic blow phenomenon that forms in the coal seam, force the inner original occlude crack in coal seam to be communicated with each other or directly form new fracture network in the coal seam, exceeding in inside, coal seam and split, expand and make water be penetrated into the coal body inside hole-fracture network that is mutually related;
3. when water injection pressure has obvious reduction, progressively reduce water injection pressure to a minimum pressure values, described minimum pressure values is 1～3 times of static pressure water injection pressure, when under described minimum pressure duty pressure, water injection rate obviously reduces or annotate when not intaking in the coal seam, again water injection pressure is progressively raised, inject the coal seam inner, to form new hydraulic blow phenomenon;
4. repeating step 2.-3., until the digging requirement is satisfied in coal seam, water filling district or water injection hole enters dynamic pressure district, coal seam.
3. coal seal water-infusion technology as claimed in claim 1 is characterized in that described static pressure water injection technology comprises:
Described one group of 1～6 water injection hole connection static pressure water filling device with the dynamic pressure district;
After the static pressure water filling begins, open static pressure main pipe rail stop valve and static pressure and divide the pipeline stop valve, a part of water in static pressure water filling feed pipe adds pump through the first differential bleeding agent continuous and quantitative, bleeding agent is pressed in static pressure water filling feed pipe, and flow into water injection pipe after mixing with another part water, enter in the coal seam.
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| CN111794798B (en) * | 2020-07-13 | 2022-04-19 | 安徽理工大学 | Working face dynamic pressure water injection dust fall method for layered fully-mechanized mining of slowly-inclined thick coal seam |
| CN112879073B (en) * | 2021-03-22 | 2024-01-26 | 北京天玛智控科技股份有限公司 | Water injection method for exploiting coal seam or rock stratum in underground coal mine |
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