CN103195471B - Method for preventing drilling collapse of downhole coal bed - Google Patents
Method for preventing drilling collapse of downhole coal bed Download PDFInfo
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- CN103195471B CN103195471B CN201310139451.9A CN201310139451A CN103195471B CN 103195471 B CN103195471 B CN 103195471B CN 201310139451 A CN201310139451 A CN 201310139451A CN 103195471 B CN103195471 B CN 103195471B
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Abstract
The invention discloses a method for preventing drilling collapse of a downhole coal bed and belongs to a method for preventing drilling collapse. During constructing a gas extraction hole of the coal bed, a drill bit retreats a certain distance after arriving a finished hole position, porous materials in a porous material conveying device are conveyed to a reserved filling section of the front end of the drill bit through an inner hole of a drill rod by the aid of the compressed air. Then the porous materials are conveyed once when the drill bit retreats a certain distance each time until the drill bit retreats to a preset sealed hole position. Porous materials reserved in holes can support hole walls to prevent collapse, and meanwhile, gaps between the holes and the porous materials provide good passages for gas suction and flowing, gas of the coal bed can be guaranteed to leak from the drilled holes to some extent even if the drilled holes collapse. The method for preventing drilling collapse of the downhole coal bed has the advantages that system and process are unique, drilling gas extraction is high in flow and concentration, the method has widely practicality and is particularly applicable to drilling of the coal bed with firmness coefficient f smaller than 0.5.
Description
Technical field
The present invention relates to and a kind ofly prevent the method collapsed of holing, a kind of particularly method preventing down-hole coal bed boring from collapsing.
Background technology
At present, the Main Means that China's coal-mine administers gas is that underground construction boring is carried out taking out in advance in advance to high gas layer, and which has the advantages such as easy construction, engineering quantity are relatively little, gas pumping efficiency is high, is the most widely used technical measures of China's coal-mine.But weak seam proportion is comparatively large in institute of China mining coal seam, the main mining coal seams in mining area such as table mountain, Huainan, the Huaibei, Guizhou, Sichuan all belong to soft, high gas layer.Affect by factors such as geostatic stress, coal seam gas-bearing capacity, gas pressure and coal mass strengths, very easily there is undergauge, partial collapse in weak seam mash gas pumping drilling, cause drilling gas extraction amount to decline to a great extent or even hole and scrap after pore-forming moves back brill.Patent CN101463708 discloses a kind of ring-type hydraulic jet bit and bad ground bolthole jetting construction method, bit freezing, bury drills can be avoided through drilling tool central passage reacting cycle deslagging and outer flat double-wall drill pipe retaining wall, though the method can keep not caving in Completion of Drilling Hole process, but complicated construction technique, and borehole collapse problem after pore-forming is not considered; Paper " improve drainage method and improve gas drainage under suction effect " proposes a kind of method sending into steel matter sleeve pipe after mash gas pumping drilling pore-forming to holing and prevents caving in of boring; but be subject to the impact of drilling tool deadweight and coal seam soft or hard layering; can deflection be there is in drilling track; and steel pipe is flexible poor; in weak seam boring, send into steel pipe be easy to top to hole wall, send into apart from limited.And coal mining machine roller contacts with steel pipe and can produce spark during working face extraction, impact safety in production.Patent CN101446178A discloses the soft projecting coal bed Wind pressure air drilling technique in a kind of down-hole, does not namely pull out of hole when drill bit gets into whole Kong Houxian from aperture, and send into guard aperture PVC screen casing by drill pipe bore, pull out of hole afterwards, screen casing is stayed drilling rod in hole and tripped out completely.But drilling rod internal diameter is often smaller, the frictional resistance sending into PVC screen casing in long distance drill pipe bore is very large, and trip-out process easily causes PVC screen casing to fracture.
Summary of the invention
The object of the invention is to provide a kind of method preventing down-hole coal bed boring from collapsing, the problem of caving in after solving high methane weak seam Completion of Drilling Hole.The problem of caving in after can solving coal bed drilling pore-forming, can ensure again the efficient extraction of gas.
The object of the present invention is achieved like this: the method step that preventing holes collapses, suddenly as follows:
A. utilize burrowing device at down-hole rib construction mash gas pumping drilling, bit drills is to stopping during borehole bottom location creeping into, and generally creep into 80 ~ 100m, every root run of steel is 0.8 ~ 1.0m;
B. drilling rod is exited 3 ~ 4, compressed air is linked into porous material conveying device, and the porous material in porous material conveying device is transported in drill pipe bore, porous material is made to enter into the reserved boring dead band in drill bit front by drill pipe bore, until stop air feed when being full of more than 2/3 of its volume capacity;
C. repeat step b, until stop conveying porous material when only remaining 10 ~ 20 drilling rods in hole, residue drilling rod in boring is all exited boring;
D. using 10 ~ 20m scope of last for boring non-filling porous material as sealing of hole section, put into drainage tube and sealing of hole mash gas extraction.
The shape of described porous material is spherical, and diameter is 1/6 ~ 1/4 of drilling rod internal diameter, and inside is pore structure, and porosity is between 0.3 ~ 0.8, and density is 100 ~ 1000kg/m
3, porous material is made up of polyurethane resin.
Described compressed air pressure value is 0.2-0.6MPa; It is the exhaust opening being not less than 22mm that drill bit contains a diameter, can ensure that porous material is blown smoothly and is not stuck in the wind path of 0.2-0.6MPa.
Have diameter to be that the aperture of 3-6mm is convenient to mash gas extraction within the scope of described drainage tube top 2m, and adopt screen cloth this 2m scope to be wrapped, the sieve diameter of screen cloth is less than the maximum gauge of porous material.
Described porous material conveying device contains an air inlet port, discharging opening, a charge door and a seal cover.Air inlet port and discharge outlet are on same horizon, and charge door Way in is vertical with inlet port direction, and seal cover is positioned at above charge door.
Beneficial effect, owing to have employed such scheme,
(1) be not take out drilling rod immediately after mash gas pumping drilling pore-forming, but by drill pipe bore move back in drill-through journey to drill bit leading portion boring headspace inject porous material, achieve drill, guard aperture integration, method is workable.
(2) porous material is by the distinguished and admirable direct injection of underground pressure air pipeline, and without the need to other subsidiary conduits, technique is unique, simple to operate.
(3) porous material enters boring aperture after wall and plays a supportive role, and offsets boring radial forces, reduces collapse hole possibility.Space simultaneously between the hole of porous material own and porous material provides passage, even if boring is caved in also can ensure that Coalbed Gas Seepage goes out boring to a certain extent for gas circulation.
Advantage: system and technique uniqueness, can ensure that drilling gas extraction flow is large, concentration is high.There is practicality widely.Be particularly useful for solid coefficient
fthe coal bed drilling that value is less than 0.5.
Accompanying drawing explanation
Fig. 1 is porous material course of conveying schematic diagram of the present invention.
Fig. 2 is that porous material of the present invention send rear hole pumping and mining gas schematic diagram.
Fig. 3 is porous material internal cross section figure of the present invention.
In figure: 1, air line valve; 2, porous material conveying device; 2-1 porous material conveying device air inlet port; 2-2, porous material conveying device discharging opening; 2-3, porous material conveying device charge door; 2-4, seal cover; 3, change head is connected; 4, drilling rod tail end; 5, rig; 6, hole; 7, drilling rod; 8, drill bit; 9, exhaust opening; 10, porous material; 10-1, porous material skeleton; 10-2, hole; 11, reserved filling dead band; 12, coal seam; 13, gas pumping pipe; 14, sealing of hole section; 15, screen cloth.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described.
Embodiment 1: the method that preventing holes collapses, step is as follows:
A. utilize burrowing device at down-hole rib construction mash gas pumping drilling, bit drills is to stopping during borehole bottom location creeping into, and generally creep into 80 ~ 100m, every root run of steel is 0.8 ~ 1.0m;
B. drilling rod is exited 3 ~ 4, compressed air is linked into porous material conveying device, and the porous material in porous material conveying device is transported in drill pipe bore, porous material is made to enter into the reserved boring dead band in drill bit front by drill pipe bore, until stop air feed when being full of more than 2/3 of its volume capacity;
C. repeat step b, until stop conveying porous material when only remaining 10 ~ 20 drilling rods in hole, residue drilling rod in boring is all exited boring;
D. using 10 ~ 20m scope of last for boring non-filling porous material as sealing of hole section, put into drainage tube and sealing of hole mash gas extraction.
The shape of described porous material is spherical, and diameter is 1/6 ~ 1/4 of drilling rod internal diameter, and inside is pore structure, and porosity is between 0.3 ~ 0.8, and density is 100 ~ 1000kg/m
3, porous material is made up of polyurethane resin.
Described compressed air pressure value is 0.2-0.6MPa; It is the exhaust opening being not less than 22mm that drill bit contains a diameter, can ensure that porous material is blown smoothly and is not stuck in the wind path of 0.2-0.6MPa.
Have diameter to be that the aperture of 3-6mm is convenient to mash gas extraction within the scope of described drainage tube top 2m, and adopt screen cloth this 2m scope to be wrapped, the sieve diameter of screen cloth is less than the maximum gauge of porous material.
Described porous material conveying device contains an air inlet port 2-1, discharging opening 2-2, a charge door 2-3 and seal cover 2-4; Air inlet port 2-1 and discharging opening 2-2 is on same horizon, and charge door 2-3 Way in is vertical with air inlet port 2-1 Way in, and seal cover 2-4 is positioned at above charge door 2-3.
Concrete: to implement to prevent the collapse device of method of down-hole coal bed boring from comprising: air line valve 1, porous material conveying device 2, porous material conveying device air inlet port 2-1, porous material conveying device discharging opening 2-2, porous material conveying device charge door 2-3, seal cover 2-4, connect become 3, drilling rod tail end 4, rig 5, drilling rod 7, drill bit 8 and exhaust opening 9; Drilling rod 7 is connected on rig 5, and drilling rod 7 is more piece, is connected with drill bit 8 in the front end of drilling rod, drill bit 8 has exhaust opening 9, drilling rod tail end 4 is connected with connect to become 3, connects to become 3 and be connected with air line valve 1 by porous material conveying device 2.
A diameter that the rib in down-hole coal bed tunnel is constructed is the down-hole coal bed mash gas pumping drilling of 89mm, employing is the rod boring of 1m/ root containing the drill bit length of fit that a diameter is 22mm exhaust opening, and the exhaust opening of this diameter can ensure that porous material is blown smoothly and is not stuck in the wind path of 0.5-0.8MPa.When bit drills is to borehole bottom location, drilling rod is exited 4, leave reserved filling dead band in drill bit front like this.Then the discharging opening of porous material conveying device and drilling rod tail end are become head be connected by being connected, the air inlet port of porous material conveying device is connected with underground pressure air pipeline.The spherical structure of porous material to be diameter be 6mm, is innerly made up of skeleton and hole, and porosity is 0.65, and density is 178kg/m
3.Porous material is made up of polyurethane resin, and hardness high-quality is light, can ensure that porous material is taken away by distinguished and admirable smoothly.Then add the porous material of 2kg to porous material conveying device, then open air line valve, regulate the air inlet port blast of porous material conveying device to 0.1MPa by pressure regulator valve.Until the porous material of 2kg has been transferred entirely in the particle transport device of hole, the particle of this quality can be full of more than 2/3 space of reserved filling dead band.Drill bit often exits 4 and just repeats above step until no longer carry porous material when only remaining 20 drilling rods in hole afterwards, but residue drilling rod is all exited boring.Then the drainage tube that 18m is long is sent in boring, diameter is had to be that the aperture of 5mm is convenient to mash gas extraction within the scope of the 2m of drainage tube front end, adopt screen cloth this 2m scope to be wrapped, screen cloth mesh diameter is 4mm, and porous material in mash gas extraction process can be prevented to be drawn out of.Then seal within the scope of the 12m of aperture, start mash gas extraction.The porous material stayed like this in boring plays a supportive role to hole wall, offsets boring radial forces, reduces collapse hole possibility.Even if boring local collapse hole, the space between the hole of porous material own and porous material provides passage for gas circulation, realizes drilling gas long time high concentration, large discharge extraction.
Claims (2)
1. the method preventing down-hole coal bed boring from collapsing, is characterized in that: the method step that preventing holes collapses is as follows:
A. utilize burrowing device at down-hole rib construction mash gas pumping drilling, bit drills is to stopping during borehole bottom location creeping into, and creep into 80 ~ 100m, every root run of steel is 0.8 ~ 1.0m;
B. when bit drills is to borehole bottom location, drilling rod is exited 3 ~ 4, compressed air is linked into porous material conveying device, and the porous material in porous material conveying device is transported in drill pipe bore, porous material is made to enter into the reserved boring dead band in drill bit front by drill pipe bore, until stop air feed when being full of more than 2/3 of its volume capacity;
C. repeat step b, until stop conveying porous material when only remaining 10 ~ 20 drilling rods in hole, residue drilling rod in boring is all exited boring;
D. using 10 ~ 20m scope of last for boring non-filling porous material as sealing of hole section, in boring, put into drainage tube and sealing of hole mash gas extraction;
The shape of described porous material is spherical, and inside is made up of skeleton and hole, and diameter is 1/6 ~ 1/4 of drilling rod internal diameter, and inside is pore structure, and porosity is between 0.3 ~ 0.8, and density is 100 ~ 1000kg/m
3, porous material is made up of polyurethane resin;
Described compressed air pressure value is 0.2-0.6MPa; It is the exhaust opening being not less than 22mm that drill bit contains a diameter, can ensure that porous material is blown smoothly and is not stuck in the wind path of 0.2-0.6MPa;
Have diameter to be that the aperture of 3-6mm is convenient to mash gas extraction within the scope of described drainage tube top 2m, and adopt screen cloth this 2m scope to be wrapped, the sieve diameter of screen cloth is less than the maximum gauge of porous material.
2. a kind of device preventing the down-hole coal bed boring method that collapses from using according to claim 1, is characterized in that: this device comprises: air line valve, porous material conveying device, connection become head, drilling rod tail end, rig, drilling rod, drill bit and exhaust opening; Drilling rod is connected on rig, and drilling rod is more piece, is connected with drill bit, drill bit has exhaust opening in the front end of drilling rod, drilling rod tail end is connected with connect to become head, connects change head and is connected with air line valve by porous material conveying device; Described porous material conveying device contains an air inlet port, discharging opening, a charge door and a seal cover; Air inlet port and discharge outlet are on same horizon, and charge door Way in is vertical with inlet port direction, and seal cover is positioned at above charge door.
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| CN201310139451.9A CN103195471B (en) | 2013-04-22 | 2013-04-22 | Method for preventing drilling collapse of downhole coal bed |
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| CN111472834B (en) * | 2020-06-10 | 2021-11-09 | 徐州工程学院 | Method for preventing upward gas extraction borehole from collapsing at fixed point |
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