CN109653722A - A kind of mash gas extraction device and method of coal seam hydraulic slotted liner technique and the linkage of lower screen casing - Google Patents

A kind of mash gas extraction device and method of coal seam hydraulic slotted liner technique and the linkage of lower screen casing Download PDF

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Publication number
CN109653722A
CN109653722A CN201910053996.5A CN201910053996A CN109653722A CN 109653722 A CN109653722 A CN 109653722A CN 201910053996 A CN201910053996 A CN 201910053996A CN 109653722 A CN109653722 A CN 109653722A
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China
Prior art keywords
drilling rod
drilling
screen casing
drill
pressure water
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Pending
Application number
CN201910053996.5A
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Chinese (zh)
Inventor
程波
邹银辉
郭永文
王振
程建圣
向衍斌
孟范喻
张锋
王典国
申伟芳
孙炳兴
杜文波
黄光利
刘俊
冉庆雷
何云文
马智勇
廖文恺
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Chongqing Research Institute Co Ltd of China Coal Technology and Engineering Group
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Chongqing Research Institute Co Ltd of China Coal Technology and Engineering Group
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Application filed by Chongqing Research Institute Co Ltd of China Coal Technology and Engineering Group filed Critical Chongqing Research Institute Co Ltd of China Coal Technology and Engineering Group
Priority to CN201910053996.5A priority Critical patent/CN109653722A/en
Publication of CN109653722A publication Critical patent/CN109653722A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/08Screens or liners
    • E21B43/086Screens with preformed openings, e.g. slotted liners
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

The present invention relates to the mash gas extraction device and methods of a kind of coal seam hydraulic slotted liner technique and the linkage of lower screen casing, belong to technical field of mine safety.The device includes drilling rod, high pressure water flowing outer tube, target drill, drill rod connecting device, drilling rod tail portion switching device, high-pressure water pipe, flexible screen casing and fixed device;Target drill is connect with drilling rod, and drilling rod connects drilling machine, by opening drilling machine, drilling to scheduled depth;Drilling rod 10 is double-layer structure, and the annular space of inner tube and drilling rod constitutes the high pressure water and flows outer tube, and inner tube and drilling rod are damascene structures;The inner tube of drilling rod is connect with drill rod connecting device, and drilling rod tail portion switching device is connect with flexible screen casing or high-pressure water pipe;Flexible screen casing is connect with fixed device, so that boring moving back, during cutting coal body, is not moved.The present invention effectively prevents blocking the flow channel of gas because of borehole collapse, while the secondary waterpower cutting that coal body is implemented can be improved again the exposed area of coal body, enhances gas pumping effect.

Description

A kind of mash gas extraction device and method of coal seam hydraulic slotted liner technique and the linkage of lower screen casing
Technical field
The invention belongs to technical field of mine safety, it is related to a kind of coal mine underground coal bed hydraulic slotted liner technique and the linkage of lower screen casing Mash gas extraction device and method.
Background technique
Coal bed gas, it is the hydrocarbon gas for being present in coal seam and coal measure strata that be otherwise known as " coal mine gas ", and main component is Methane is the associated minerals resource of coal.When concentration reaches 5%-16% in air for it, it is once coal mine that meeting open fire, which can explode, One of chief threat of safety in production.On the other hand, coal bed gas is first-class industry, chemical industry, power generation and resident living fuel.1 Cubic meter coal bed gas is about as much as 9.5 degree of electricity, 1.13 kilograms of gasoline, 1.21 kilograms of standard coals.The calorific value of coal bed gas is general 2 to 5 times of coal are nearly free from any exhaust gas after burning, be undisputed " high-quality " clean energy resource.And as the mankind are to it Understanding gradually deeply, it is come out from underground large scale mining, not only the life of the underground jobs personnel such as effective guarantee miner Life safety, and city, factory and rural area are entered by pipeline, become one of clean energy resource common in people's production and living.
There are mainly two types of development schemes at present for coal bed gas resource: first is that mining with surface drill well;Second is that underground extraction.It bores on ground Well exploitation is mined after first gas production, to create premise using coal bed gas, is also beneficial to improve the safety production condition of coal mine.Underground Extraction is gas production or the gas production in coal mining after first mining, and the coal bed gas overwhelming majority of extraction enters ground coal bed gas collector and delivery pipe Net, implementable coal bed gas power generation or cryogenic liquefying, and then realize the development and utilization of gas reservoir resource.Due to China's coal seam geological condition It is complex, thus a large amount of ground drilling of constructing is implemented cbm development and is restricted, the exploitation of China's coal bed gas at present is still Based on the extraction of underground.But since the most of high methane in China or coal and gas outburst mine coal seam belong to low yolk coal Layer, thus gas permeability is poor, and collapse hole easily occurs for the drilling constructed in coal seam, causes extracting result poor.Though currently, there is well The gas permeability of lower hydraulic fracturing or the measure of high-pressure hydraulic slot to improve coal seam increases the mash gas extraction amount of drilling, but With the progress of extraction operation, collapse hole easily occurs for mash gas pumping drilling, to plug flow channel of the gas in drilling, drops Low mash gas extraction effect.
Therefore, in order to increase coal mine gas extraction amount, the threat degree of coal mine gas disaster is reduced, ensures high methane Or the safety in production of coal and gas outburst mine, need a kind of device of effective mash gas extraction.
Summary of the invention
In view of this, the purpose of the present invention is to provide the pumpings of a kind of coal mine underground coal bed hydraulic slotted liner technique and the linkage of lower screen casing Mash gas device and method drills and easily collapses after solving underground coal mine implementation hydraulic slotted liner technique increase gas permeability of coal seam, reduction The problem of gas pumping effect is realized and improves gas permeability of coal seam, and the double technique of coal mine gas extraction borehole collapsing is prevented Benefit reduces the threat degree of coal mine gas disaster to increase coal mine gas extraction amount, ensures high methane or coal and gas The safety in production of projecting mine provides technological means.
In order to achieve the above objectives, the invention provides the following technical scheme:
The mash gas extraction device of a kind of coal seam hydraulic slotted liner technique and the linkage of lower screen casing, including the flowing of drilling rod (10), high pressure water are outer Manage (11), target drill (9), drill rod connecting device (2), drilling rod tail portion switching device (4), high-pressure water pipe (5), flexible screen casing (8) and it is fixed device (13);
For the target drill (9) with the drilling rod (10) using being threadedly coupled, the drilling rod (10) connects drilling machine (1), leads to It crosses unlatching drilling machine (1), drilling to scheduled depth;
The drill rod connecting device (2) and drilling rod tail portion switching device (4) are arranged on drilling rod (10);The drilling rod (10) be double-layer structure, the annular space of inner tube and drilling rod (10) constitutes high pressure water flowing outer tube (11), and inner tube with Drilling rod (10) is damascene structures;The inner tube of the drilling rod (10) is connect with drill rod connecting device (2), drilling rod tail portion switching device (4) it is connect with flexible screen casing (8) or high-pressure water pipe (5);
The flexibility screen casing (8) connect with the fixed device (13), so that boring moving back, during cutting coal body, no It moves.
Further, described high-pressure water pipe (5) one end is connected to drilling rod tail portion switching device (4), and the other end is sequentially connected height Press pump station (6) and softening pond (7).
Further, drilling rod tail portion switching device (4) is three-port structure, and one end is connect with drill rod connecting device (2), separately Outer both ends are connect with flexible screen casing (8) or high-pressure water pipe (5) respectively.
Further, sieve pore (12) are offered on the flexible screen casing (8), is gas when its role is to which collapse hole occurs Flowing provides channel.
Further, the fixed device (13) includes suspension fin, has zoom function;When fixed device (13) are being bored When bar inner tube wall, it is in contraction state;When sending to foot of hole, suspension fin is opened and is wedged in hole wall, passes through suspension The support of fin positions, and flexible screen casing (8) then stays in hole, provides channel for Gas Flow.
Further, the target drill (9) is divided into the target drill used when two kinds of high-pressure water jet slots, and one kind is the The target drill used when slot;The target drill that another kind uses when being second of slot;Described two target drills It is arranged with slot mouth, the axis direction of slot mouth and the axial direction of drilling rod are in a certain angle;When from the first time slot The high pressure water flow direction that the target drill that uses sprays is in front of drill bit, the target drill spray that uses when from second of slot High pressure water flow direction out is at drill bit rear.
Further, the mash gas extraction side suitable for the coal seam hydraulic slotted liner technique and the mash gas extraction device of lower screen casing linkage Method, specifically includes the following steps:
S1: the target drill (9) used when by first time high-pressure water jet slot is connect with drilling rod (10), and opens drilling machine (1), it creeps into scheduled depth;
S2: it is to be drilled proceed to scheduled depth after, stop drilling;Then, high pressure pumping station (6) are opened, makes to soften in pond (7) Clear water via high-pressure water pipe (5) enter to high pressure water flowing outer tube (11);
S3: clear water enters high pressure water flowing outer tube (11), migrates to the slot mouth on target drill (9), in the work of pressure Under, slot mouth is ejected, forms high pressure jer cutting coal body;
S4: after opening high pressure pumping station (6), drilling machine (1) is opened immediately, moves back brill;And make drilling rod (10) and target drill (9) Rotation is realized and is cut to the annular of coal body;
S5: when drilling rod exits length of the length up to 1 drilling rod, drilling machine (1) and high pressure pumping station (6) is closed;Then it unloads First drilling rod exited;
S6: repeating step S4~S5, until unloading last root drilling rod;
S7: the target drill that replacement target drill (9) uses when being second of slot connect it with drilling rod (10), and Target drill is sent to foot of hole;
S8: it by flexible screen casing (8) via drilling rod tail portion switching device (4), send to foot of hole;It is then turned on drilling machine (1), Rotate drilling rod (10) and target drill (9), flexible screen casing (8) under the effect of external force, is fixed on foot of hole;
S9: repeating step S4~S5, until unloading last root drilling rod;
S10: drainage tube is sent to drilling, is then blocked to drilling;After closure, by drainage tube and underground Extraction pipe network is grid-connected to connect pumping.
S11: if coal seam is extremely soft, a slot, no replacement is required target drill can only be carried out;After completing S1, with Carry out S8, S4, S5.
The beneficial effects of the present invention are: the anti-reflection operation of underground coal mine high-pressure hydraulic slot can be achieved in the present invention and decentralization is sieved The linkage operation of pipe, and then improve mine gas extraction effect.The present invention has the advantage that compared with previous experimental method
(1) the achievable secondary high-pressure hydraulic slotted liner technique of the present invention so that form criss-cross gap in coal body, coal body it is sudden and violent Show up product, further increases the slot effect of coal body;
(2) the high-pressure hydraulic slot of the achievable coal body of present invention progress synchronous with decentralization screen casing operation, it is real in coal body During applying second of hydraulic slotted liner technique, decentralization screen casing operation carries out simultaneously, and the two is not interfere with each other;Second of hydraulic slotted liner technique is made After industry, decentralization screen casing operation is completed immediately, simple process;
(3) present invention may make during drilling grid-connected mash gas extraction, avoid resulting in blockage because of borehole collapse watt This flow channel in drilling.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out Illustrate:
Fig. 1 is the structural schematic diagram of mash gas extraction device of the present invention;
Fig. 2 is the connection schematic diagram of drilling rod and target drill;
Fig. 3 is the connection schematic diagram of flexible hose and fixed device;
Fig. 4 is the flow diagram of mash gas extraction method of the present invention;
Appended drawing reference: 1- drilling machine;2- drill rod connecting device;The coal seam 3-;4- drilling rod tail portion switching device;5- high-pressure water pipe; 6- high pressure pumping station;7- softens pond;8- flexibility screen casing;9- target drill;10- drilling rod;11- high pressure water flows outer tube;12- sieve Hole;13- fixes device;14- inner tube.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As shown in Figure 1, the coal petrography adsorbed gas scale of construction provided in an embodiment of the present invention, the Simultaneous Determination method of deformation and porosity And device, the adsorption gas for measuring coal sample during adsorption gas, under the conditions of different adsorption equilibrium gas pressures Amount, deformation and porosity, including drilling machine, drill rod connecting device, coal seam, drilling rod tail portion switching device, high-pressure water pipe, high-pressure pump It stands, soften pond, flexible screen casing, target drill, drilling rod, high pressure water flowing outer tube, sieve pore, fixed device.
As shown in Figures 1 to 3, the mash gas extraction device of coal seam hydraulic slotted liner technique of the present invention and the linkage of lower screen casing, including Drilling rod 10, high pressure water flowing outer tube 11, target drill 9, drill rod connecting device 2, drilling rod tail portion switching device 4, high-pressure water pipe 5, Flexible screen casing 8 and fixed device 13;For target drill 9 with drilling rod 10 using being threadedly coupled, the drilling rod 10 connects drilling machine 1, passes through Open drilling machine 1, drilling to scheduled depth;Drill rod connecting device 2 and drilling rod tail portion switching device 4 are arranged on drilling rod 10; The drilling rod 10 is double-layer structure, the annular space composition of the inner tube and drilling rod 10 high pressure water flowing outer tube 11, and inner tube It is damascene structures with drilling rod 10;The inner tube of the drilling rod 10 is connect with drill rod connecting device 2, drilling rod tail portion switching device 4 with Flexible screen casing 8 or high-pressure water pipe 5 connect;Flexible screen casing 8 is connect with the fixed device 13, so that boring moving back, cuts coal body In the process, it does not move.5 one end of high-pressure water pipe is connected to drilling rod tail portion switching device 4, and the other end is sequentially connected high pressure pumping station 6 and softening pond 7.Drilling rod tail portion switching device 4 is three-port structure, and one end is connect with drill rod connecting device 2, and in addition both ends are distinguished It is connect with flexible screen casing 8 or high-pressure water pipe 5.Sieve pore 12 is offered on flexible screen casing 8, is watt when its role is to which collapse hole occurs This flowing provides channel.Fixed device 13 includes suspension fin, has zoom function;When fixed device 13 is in drilling rod inner tube When inner wall, it is in contraction state;When sending to foot of hole, suspension fin is opened and is wedged in hole wall, is passed through and is hung fin Support positioning, flexible screen casing 8 then stay in hole, provide channel for Gas Flow.
The target drill that target drill 9 is divided to use when two kinds of high-pressure water jet slots, one kind make when being first time slot Target drill;The target drill that another kind uses when being second of slot;Described two target drills are arranged with slot Mouthful, the axis direction of slot mouth and the axial direction of drilling rod are in a certain angle;The special jewel used when from the first time slot The high pressure water flow direction that head sprays is in front of drill bit, high pressure water flow that the target drill used when from second of slot sprays Direction is at drill bit rear.
As shown in figure 4, the extraction watt of coal seam hydraulic slotted liner technique of the present invention and the mash gas extraction device of lower screen casing linkage This method, specifically includes the following steps:
S1: the target drill 9 used when by first time high-pressure water jet slot is connect with drilling rod 10, and opens drilling machine 1, is bored Proceed to scheduled depth;
S2: it is to be drilled proceed to scheduled depth after, stop drilling;Then, high pressure pumping station 6 is opened, makes to soften clear in pond 7 Water enters to high pressure water flowing outer tube 11 via high-pressure water pipe 5;
S3: clear water enters high pressure water flowing outer tube 11, and migration is to the slot mouth on target drill 9, under the effect of the pressure, Slot mouth is ejected, high pressure jer cutting coal body is formed;
S4: after opening high pressure pumping station 6, drilling machine 1 is opened immediately, moves back brill;And drilling rod 10 and target drill 9 are rotated, it is real Now the annular of coal body is cut;
S5: when drilling rod exits length of the length up to 1 drilling rod, drilling machine 1 and high pressure pumping station 6 are closed;Then it unloads and exits First drilling rod;
S6: repeating step S4~S5, until unloading last root drilling rod;
S7: the target drill that replacement target drill 9 uses when being second of slot connect it with drilling rod 10, and will be special It is sent with drill bit to foot of hole;
S8: it by flexible screen casing 8 via drilling rod tail portion switching device 4, send to foot of hole;It is then turned on drilling machine 1, makes drilling rod 10 rotate with target drill 9, and flexible screen casing 8 under the effect of external force, is fixed on foot of hole;
S9: repeating step S4~S5, until unloading last root drilling rod;
S10: drainage tube is sent to drilling, is then blocked to drilling;After closure, by drainage tube and underground Extraction pipe network is grid-connected to connect pumping.
S11: if coal seam is extremely soft, a slot, no replacement is required target drill can only be carried out;After completing S1, with Carry out S8, S4, S5.
Connecting target drill 9 with drilling rod 10 in the step S1, specifically includes:
1) target drill 9 is used with drilling rod 10 and is threadedly coupled.It is two kinds that the target drill 9, which is divided to, and one kind is cut for first time The target drill used when seam;The target drill that another kind uses when being second of slot.
2) drilling rod 10 is double-layer structure, and inner tube 14 and the annular space of drilling rod 10 flow outer tube 11, and inner tube for high pressure water It is damascene structures with drilling rod 10.
3) when creeping into, the inner tube 14 of drilling rod 10 is connect with drill rod connecting device 2, drilling rod tail portion switching device 4 and coal mine Wind or water pipe connection are pushed, to discharge to the drilling cuttings generated in drilling process;Drilling rod tail portion switching device 4 is three Logical structure, one end are communicated with drill rod connecting device 2, and in addition both ends push wind or water pipe with coal mine respectively, and high-pressure water pipe is connected It connects.
4) with the progress of drilling, drilling machine 2 can be closed at any time, drilling rod 10 is connected with drill rod connecting device 2, realized and bored Into continuing for operation.
Unlatching high pressure pumping station 6 in the step S2 enters the clear water in softening pond 7 via high-pressure water pipe 5 supreme Water flow outer tube 11, specifically includes:
1) softening pond 7 can soften water;
2) high pressure pumping station 6 makes the clear water pressure increase handled via softening pond 7, and passes sequentially through high-pressure water pipe 5, bores Bar tail portion switching device 4, drill rod connecting device 2 enter to the flowing outer tube 11 of the high pressure water inside drilling rod 10.
Clear water in the step S3 enters high pressure water flowing outer tube 11, migrates to the slot mouth on target drill 9, is pressing Under the action of power, slot mouth is ejected, high pressure jer cutting coal body is formed, specifically includes:
1) the slot mouth on the target drill 9 is shrink mouth shape, and clear water is ejected and cut under the action of high pressure pumping station 6 Sealing forms high-pressure water jet and implements to cut to coal body;The axial direction of the high-pressure water jet and drilling rod is a certain included angle;
2) after high-pressure water jet implements cutting to coal body, the gap of certain depth and width is formed inside coal body, is increased So that the gas permeability in drilling surrounding medium increases, and then brill can be improved in the area that gas flows in drilling surrounding medium Hole mash gas extraction amount quickly reduces the gas bearing capacity of coal body, enhances the effect of gas drainage.
In the step S4 after opening high pressure our station 6, immediately open drilling machine 1, move back brill;And make drilling rod 10 and special jewel First 9 rotation then can be achieved to cut the annular of coal body, specifically include:
1) drilling machine 1 is opened, then drilling rod 10 can be rotated with target drill 9 during moving back and boring;
2) during moving back brill, with the rotation of drilling rod 10 and target drill 9, then the high-pressure water jet that slot mouth ejects So that coal body forms round table-like gap.
Target drill 9 is replaced in the step S7, connect target drill 9 with drilling rod 10, and target drill 9 is sent to brill Hole bottom, specifically includes:
1) target drill 9 is replaced, the target drill 9 of the replacement exists with the drill bit difference used when first time slot In the position of slot mouth;The position of the slot mouth may make high-pressure water jet slot direction be drill bit rear, and with it is dedicated The axial direction of drill bit 9 and drilling rod 10 is a certain included angle;
2) target drill of replacement 9 is connect with drilling rod 10, disconnecting does not enter drilling rod 10, reaches target drill 9 To hole bottom when creeping into.
Flexible screen casing 8 is sent via drilling rod tail portion switching device 4 to foot of hole in the step S8;It then opens and bores Machine rotates drilling rod 10 and target drill 9, and flexible screen casing 8 under the effect of external force, is fixed on foot of hole, specifically includes:
1) the flexible screen casing 8 is connect with fixed device 13, offers sieve pore 12 on flexible screen casing 8, its role is to send out When raw collapse hole, channel is provided for the flowing of gas;The fixed device 13 due to drilling rod inner tube wall limit and in shrink State, when sending to drilling hole bottom, fixed device 13 stretches out, wherein the suspension fin of fixed device 13 can be opened and be wedged In hole wall, the support by hanging fin is positioned, and flexible screen casing 8 then stays in hole, plays and provide the work in channel for Gas Flow With.
2) flexible screen casing 8 is combined with fixed device 13, so that boring moving back, during cutting coal body, is not moved.
Drainage tube is sent to drilling in the step S10, then drilling is blocked;After closure, it can incite somebody to action The drainage tube and extraction pipe network of underground is grid-connected connects pumping, specifically includes:
1) internal diameter of the drainage tube is greater than the outer diameter of flexible screen casing 8, and is less than the diameter of drilling, therefore drainage tube and drilling There are annular spaces between inner wall.
2) described pair of drilling is blocked specifically, pouring into polyurethane solutions on cotton yarn, is then put into cotton yarn There are in annular space between drainage tube and drill hole inner wall, after it sufficiently reacts, solidifies, then by drainage tube by coiled pipe or Other union devices are connected with coal mine gas extraction pipeline, then grid-connected to connect pumping.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (8)

1. the mash gas extraction device of a kind of coal seam hydraulic slotted liner technique and the linkage of lower screen casing, which is characterized in that the device includes drilling rod (10), high pressure water flows outer tube (11), target drill (9), drill rod connecting device (2), drilling rod tail portion switching device (4), high pressure Water pipe (5), flexible screen casing (8) and fixation device (13);
The target drill (9) is with the drilling rod (10) using being threadedly coupled, and the drilling rod (10) connects drilling machine (1), by opening It opens drilling machine (1), drilling to scheduled depth;
The drill rod connecting device (2) and drilling rod tail portion switching device (4) are arranged on drilling rod (10);The drilling rod (10) is Double-layer structure, the annular space composition of inner tube and drilling rod (10) high pressure water flowing outer tube (11), and inner tube and drilling rod It (10) is damascene structures;The inner tube of the drilling rod (10) is connect with drill rod connecting device (2), drilling rod tail portion switching device (4) It is connect with flexible screen casing (8) or high-pressure water pipe (5);
The flexibility screen casing (8) connect with the fixed device (13), so that boring moving back, during cutting coal body, does not occur It is mobile.
2. the mash gas extraction device of a kind of coal seam hydraulic slotted liner technique according to claim 1 and the linkage of lower screen casing, feature exist Drilling rod tail portion switching device (4) is connected in, described high-pressure water pipe (5) one end, and the other end is sequentially connected high pressure pumping station (6) and soft Change pond (7).
3. the mash gas extraction device of a kind of coal seam hydraulic slotted liner technique according to claim 1 and the linkage of lower screen casing, feature exist Be three-port structure in, drilling rod tail portion switching device (4), one end is connect with drill rod connecting device (2), in addition both ends respectively with Flexible screen casing (8) or high-pressure water pipe (5) connection.
4. the mash gas extraction device of a kind of coal seam hydraulic slotted liner technique according to claim 1 and the linkage of lower screen casing, feature exist In offering sieve pore (12) on flexibility screen casing (8), when its role is to which collapse hole occurs, provide channel for the flowing of gas.
5. the mash gas extraction device of a kind of coal seam hydraulic slotted liner technique according to claim 1 and the linkage of lower screen casing, feature exist In the fixed device (13) includes suspension fin, has zoom function;When fixed device (13) are in drilling rod inner tube wall When, it is in contraction state;When sending to drilling hole bottom, suspension fin is opened and is wedged in hole wall, passes through the support of suspension fin Positioning, flexible screen casing (8) then stay in hole, provide channel for Gas Flow.
6. the mash gas extraction device of a kind of coal seam hydraulic slotted liner technique according to claim 1 and the linkage of lower screen casing, feature exist In the target drill (9) is divided into the target drill used when two kinds of high-pressure water jet slots, and one kind makes when being first time slot Target drill;The target drill that another kind uses when being second of slot;Described two target drills are arranged with slot Mouthful, the axis direction of slot mouth and the axial direction of drilling rod are in a certain angle;The special jewel used when from the first time slot The high pressure water flow direction that head sprays is in front of drill bit, high pressure water flow that the target drill used when from second of slot sprays Direction is at drill bit rear.
7. being suitable for a kind of coal seam hydraulic slotted liner technique of any one of claim 1~6 described device and the pumping of lower screen casing linkage Mash gas method, which is characterized in that this method specifically includes the following steps:
S1: the target drill (9) used when by first time high-pressure water jet slot is connect with drilling rod (10), and opens drilling machine (1), It creeps into scheduled depth;
S2: it is to be drilled proceed to scheduled depth after, stop drilling;Then, high pressure pumping station (6) are opened, makes to soften clear in pond (7) Water enters to high pressure water flowing outer tube (11) via high-pressure water pipe (5);
S3: clear water enters high pressure water and flows outer tube (11), migration to the slot mouth on target drill (9), under the effect of the pressure, Slot mouth is ejected, high pressure jer cutting coal body is formed;
S4: after opening high pressure pumping station (6), drilling machine (1) is opened immediately, moves back brill;And revolve drilling rod (10) and target drill (9) Turn, realizes and the annular of coal body is cut;
S5: when drilling rod exits length of the length up to 1 drilling rod, drilling machine (1) and high pressure pumping station (6) is closed;Then it unloads and exits First drilling rod;
S6: repeating step S4~S5, until unloading last root drilling rod;
S7: the target drill that replacement target drill (9) uses when being second of slot connect it with drilling rod (10), and will be special It is sent with drill bit to foot of hole;
S8: it by flexible screen casing (8) via drilling rod tail portion switching device (4), send to foot of hole;It is then turned on drilling machine (1), makes to bore Bar (10) and target drill (9) rotate, and flexible screen casing (8) under the effect of external force, is fixed on foot of hole;
S9: repeating step S4~S5, until unloading last root drilling rod;
S10: drainage tube is sent to drilling, is then blocked to drilling;After closure, by the extraction of drainage tube and underground Pipe network is grid-connected to connect pumping.
8. the mash gas extraction method of a kind of coal seam hydraulic slotted liner technique according to claim 7 and the linkage of lower screen casing, feature exist In can only carry out a slot, no replacement is required target drill if coal seam is extremely soft;After completing step S1, carry out immediately Step S8, S4, S5.
CN201910053996.5A 2019-01-21 2019-01-21 A kind of mash gas extraction device and method of coal seam hydraulic slotted liner technique and the linkage of lower screen casing Pending CN109653722A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110195580A (en) * 2019-05-27 2019-09-03 煤科集团沈阳研究院有限公司 A kind of gas-liquid two-phase synergy coal seam anti-reflection method
CN110454105A (en) * 2019-08-27 2019-11-15 中煤科工集团重庆研究院有限公司 Coal mine underground coal bed gas bearing capacity with boring in-situ test system and method
CN110700798A (en) * 2019-10-09 2020-01-17 中国矿业大学 Efficient gas extraction method for coal seam containing gangue
CN111119980A (en) * 2019-12-18 2020-05-08 中煤科工集团重庆研究院有限公司 Uniform self-pressure-relief anti-reflection drilling method
CN111335861A (en) * 2020-03-20 2020-06-26 中煤科工集团重庆研究院有限公司 Safety protection method for ultrahigh-pressure hydraulic slotting device
CN112228028A (en) * 2020-09-14 2021-01-15 山东科技大学 Remote-control efficient hydraulic coal seam cutting permeability increasing device and construction method
NL2025096B1 (en) * 2020-02-26 2021-03-30 Univ Anhui Sci & Technology Gas extraction pipe applicable to upbound borehole tending to collapse background

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110195580A (en) * 2019-05-27 2019-09-03 煤科集团沈阳研究院有限公司 A kind of gas-liquid two-phase synergy coal seam anti-reflection method
CN110454105A (en) * 2019-08-27 2019-11-15 中煤科工集团重庆研究院有限公司 Coal mine underground coal bed gas bearing capacity with boring in-situ test system and method
CN110700798A (en) * 2019-10-09 2020-01-17 中国矿业大学 Efficient gas extraction method for coal seam containing gangue
CN111119980A (en) * 2019-12-18 2020-05-08 中煤科工集团重庆研究院有限公司 Uniform self-pressure-relief anti-reflection drilling method
CN111119980B (en) * 2019-12-18 2021-08-17 中煤科工集团重庆研究院有限公司 Uniform self-pressure-relief anti-reflection drilling method
NL2025096B1 (en) * 2020-02-26 2021-03-30 Univ Anhui Sci & Technology Gas extraction pipe applicable to upbound borehole tending to collapse background
CN111335861A (en) * 2020-03-20 2020-06-26 中煤科工集团重庆研究院有限公司 Safety protection method for ultrahigh-pressure hydraulic slotting device
CN112228028A (en) * 2020-09-14 2021-01-15 山东科技大学 Remote-control efficient hydraulic coal seam cutting permeability increasing device and construction method

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