CN103216259A - System protecting underground coal bed hole drilling from collapse - Google Patents
System protecting underground coal bed hole drilling from collapse Download PDFInfo
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- CN103216259A CN103216259A CN2013101387996A CN201310138799A CN103216259A CN 103216259 A CN103216259 A CN 103216259A CN 2013101387996 A CN2013101387996 A CN 2013101387996A CN 201310138799 A CN201310138799 A CN 201310138799A CN 103216259 A CN103216259 A CN 103216259A
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- porous material
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- material conveying
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Abstract
The invention belongs to systems preventing hole drilling from collapse, and provides a system protecting underground coal bed hole drilling from collapse. The system comprises an air inlet tube, regulating valves, a dehumidification device, pressure gages, a porous material delivery mechanism, a discharge tube, a variable head, a drilling machine, a drill stem and an improved drill bit. The air inlet tube is connected with the dehumidification device. A first regulating valve is arranged between the air inlet tube and the dehumidification device. The dehumidification device is connected with an air inlet of the porous material delivery mechanism. A first pressure gage and a second regulating valve are arranged in sequence between the dehumidification device and the porous material delivery mechanism. A discharge port of the porous material delivery mechanism is connected with the tail portion of the last section of the drill stem of the drilling machine through the variable head. A second pressure gage and a third regulating valve are arranged in sequence between the porous material delivery mechanism and the variable head. The improved drill bit is connected with the front end of the drill stem. The system protecting underground coal bed hole drilling from collapse has the advantages of being simple in structure, convenient to operate, practical, effective, and particularly suitable for hole drilling of a high-gas fluffy coal bed due to the fact that internal holes of the porous material delivery mechanism and gaps between granules provide channels for gas seepage, wherein the value of firmness coefficient f of the high-gas fluffy coal bed is less than 0.3.
Description
Technical field
The present invention relates to a kind of protection boring system that collapses, particularly a kind ofly protect the system that down-hole coal bed boring is collapsed.
Background technology
Because the weak seam proportion is bigger in China institute mining coal seam, mining area master's mining coal seams such as table mountain, Huainan, the Huaibei, Guizhou, Sichuan all belong to soft, high gas layer.Partial collapse very easily takes place later on pore-forming in the weak seam mash gas pumping drilling in work progress, block the Gas Flow passage, cause gas pumping concentration and flow to descend fast, influenced the gas pumping effect, and the caving in and to cause whole boring to be scrapped, waste material resources manpower of boring.At present, the main method that prevents for caving in behind the mash gas pumping drilling pore-forming is to send into steel pipe or PVC screen casing.But the track in gas pumping hole is not a straight line in the weak seam, sends at pipe like this and pushes up hole wall in the process easily.If run into the situation of moving back the hole of just collapsing behind the brill, pipe just can't be by the porose area that collapses.In addition, patent CN101446178A discloses under the soft projecting coal bed boring in a kind of down-hole plumber's skill, does not promptly pull out of hole when drill bit gets into whole Kong Houxian from the aperture, sends into the PVC screen casing by drill pipe bore, pulls out of hole afterwards, and screen casing stays that drilling rod trips out fully in the hole.But be subjected to the restriction of drilling rod internal diameter, the pipe diameter that is lowered to is less than normal, has influenced the gas pumping effect.
Summary of the invention
The system that will provide a kind of simple in structure, easy to operate down-hole coal bed boring of protection to collapse is provided, solves the problem of caving in behind the coal bed drilling pore-forming, particularly solve the problem of caving in after the high gas utmost point weak seam Completion of Drilling Hole.
The object of the present invention is achieved like this: a kind ofly protect the system that down-hole coal bed boring is collapsed, comprise air inlet pipe, first control valve, dehydrating unit, first pressure meter, second control valve, second pressure meter, the 3rd control valve, porous material conveying device, discharge nozzle, change head, rig, drilling rod and drill bit; Described air inlet pipe links to each other with dehydrating unit, and first control valve is arranged between air inlet pipe and the dehydrating unit; Dehydrating unit links to each other with porous material conveying device air inlet port, is provided with first pressure meter and second control valve between dehydrating unit and the porous material conveying device successively; Porous material conveying device discharging opening is connected with the final section drilling rod afterbody of rig through becoming head, is provided with second pressure meter and the 3rd control valve successively between porous material conveying device and the change head, and the front end of drilling rod is connected with drill bit.
Described drill bit is that to contain a diameter be the exhaust opening that is not less than 22mm.
Described porous material is spherical, and diameter is 1/6 ~ 1/4 of a 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 by polyurethane resin.
Described porous material conveying device contains a porous material conveying device air inlet port, a porous material conveying device discharging opening, a porous material conveying device charge door and a seal cover; Porous material conveying device air inlet port and porous material conveying device discharging opening are on the same horizon, porous material conveying device charge door Way in is vertical with porous material conveying device inlet port direction, and seal cover is positioned at porous material conveying device charge door top.
Owing to adopted such scheme, the present invention to have following beneficial effect:
(1) not to take out drilling rod immediately behind the mash gas pumping drilling pore-forming, but in moving back the brill process, injects porous material that realized drilling, carried porous material integrated, method is workable to drill bit leading portion borehole space by drill pipe bore.
(2) adopt the down-hole to press wind to carry porous material, need not extra power as power, safe, workable.
(3) porous material plays a supportive role to hole wall after entering boring, offsets hole diameter to active force, reduces the hole possibility of collapsing.Space between hole of porous material own and the porous material provides passage for the gas circulation simultaneously, can ensure to a certain extent that also coal-bed gas seepage flow goes out boring even boring is caved in.
Advantage: this system and technology uniqueness, simple to operate, boring gas pumping flow is big, concentration is high.Has practicality widely.This system and technology are particularly useful for solid coefficient
fValue is less than 0.3 high gas dead-soft coal seam.
Description of drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a porous material conveying device schematic diagram of the present invention.
Fig. 3 is porous material internal cross section figure of the present invention.
Among the figure: 1, air inlet pipe; 2, first control valve; 3, dehydrating unit; 4, first pressure meter; 5, second control valve; 6, porous material conveying device; 6-1, porous material conveying device air inlet port; 6-2, porous material conveying device discharging opening; 6-3, porous material conveying device charge door; 6-4, seal cover; 7, second pressure meter; 8, the 3rd control valve; 9, discharge nozzle; 10, become head; 11, rig; 12, boring; 13, drilling rod; 14, drill bit; 15, steam vent; 16, porous material; 16-1, porous material skeleton; 16-2, hole; 17, filling dead band; 18, coal seam.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described.
Embodiment 1: a kind ofly protect the system that down-hole coal bed boring is collapsed, comprise air inlet pipe 1, first control valve 2, dehydrating unit 3, first pressure meter 4, second control valve 5, second pressure meter 7, the 3rd control valve 8, porous material conveying device 6, discharge nozzle 9, become 10, rig 11, drilling rod 13 and drill bit 14; Described air inlet pipe 1 links to each other with dehydrating unit 3, and first control valve 2 is arranged between air inlet pipe 1 and the dehydrating unit 3; Dehydrating unit 3 links to each other with porous material conveying device air inlet port 6-1, is provided with first pressure meter 4 and second control valve 5 between dehydrating unit 3 and the porous material conveying device 6 successively; Porous material conveying device discharging opening 6-2 is connected with final section drilling rod 13 afterbodys of rig 11 through becoming 10, is provided with second pressure meter 7 and the 3rd control valve 8 successively between porous material conveying device 6 and the change 10, and the front end of drilling rod 13 is connected with drill bit 14.
Described drill bit is that to contain a diameter be the exhaust opening that is not less than 22mm, and porous material enters the filling dead band by exhaust opening.
Described porous material 16 is spherical, and diameter is 1/6 ~ 1/4 of a drilling rod internal diameter, and porous material 16 has porous material skeleton 16-1, and inside is hole 16-2 structure, and porosity is between 0.3 ~ 0.8, and density is 100 ~ 1000kg/m
3, porous material 16 is made by polyurethane resin.
Described porous material conveying device 6 contains a porous material conveying device air inlet port 6-1, porous material conveying device discharging opening 6-2, a porous material conveying device charge door 6-3 and a seal cover 6-4; Porous material conveying device air inlet port 6-1 and porous material conveying device discharging opening 6-2 are on the same horizon, porous material conveying device charge door 6-3 Way in is vertical with porous material conveying device air inlet port 6-1 Way in, and seal cover 6-4 is positioned at porous material conveying device charge door 6-3 top.
Concrete, when construction diameter is the down-hole coal bed gas pumping of 89mm hole, adopt the improvement drill bit that to contain a diameter be the 22mm exhaust opening to creep into, the exhaust opening of this diameter can ensure that porous material is blown smoothly and is not stuck in the wind path of 0.1 ~ 0.6MPa.When bit drills when the whole hole site, drilling rod is withdrawed from 4.Then air inlet pipe is linked to each other with the down-hole air line, the other end of air inlet pipe connects dehydrating unit simultaneously, and described dehydrating unit is commercial product; Be connected with first control valve between dehydrating unit and the air inlet pipe, the other end of dehydrating unit links to each other with porous material conveying device inlet gas, first pressure meter and second control valve are arranged between dehydrating unit and the porous material conveying device, porous material conveying device discharging opening is connected with final section drilling rod afterbody through becoming head, is provided with second pressure meter and the 3rd control valve successively between porous material conveying device and the change head.At first close all control valves, add the porous material of 2kg then to porous material conveying device storage tank, the porous material volume of this quality accounts for 2/3 of filling dead band, and porous material is a spheric granules, and diameter is 6mm, and density is 178kg/m
3Porous material is made by polyurethane resin, and the hardness high-quality is light, can guarantee that porous material taken away by distinguished and admirable smoothly.Guarantee porous material conveying device tightness simultaneously.Cover seal cover then.Then open first control valve, when the band pressure gauge reading is 0.2MPa, open second control valve and the 3rd control valve successively.Like this, distinguished and admirablely behind dehydrating unit, enter the porous material conveying device, and carry porous material and enter drilling rod inside through becoming head by discharging opening.Observe second pressure meter, regulate second control valve and further control the feed flow that the blast size is regulated and control porous material.Under the effect of blast, porous material flows forward in drilling rod inside, enters boring filling dead band through the steam vent that improves on the drill bit then.When the porous material in the porous material conveying device all has been transferred, close the 3rd control valve earlier, close second control valve again.Whenever withdraw from 4 drilling rods afterwards and just repeat above step and stop to carry porous material until drill bit during apart from drilling orifice 20m, then withdraw from the residue drilling rod, sealing of hole also carries out gas pumping.The porous material of staying in the hole plays a supportive role to hole wall, offsets hole diameter to active force, reduces the hole possibility of collapsing.Space between hole of porous material own and the porous material provides passage for the gas circulation simultaneously, can ensure to a certain extent that also coal-bed gas seepage flow goes out boring even boring is caved in.
Claims (4)
1. one kind is protected the system that down-hole coal bed boring is collapsed, a kind ofly protect the system that down-hole coal bed boring is collapsed, comprise air inlet pipe, first control valve, dehydrating unit, first pressure meter, second control valve, second pressure meter, the 3rd control valve, porous material conveying device, discharge nozzle, change head, rig, drilling rod and drill bit; Described air inlet pipe links to each other with dehydrating unit, and first control valve is arranged between air inlet pipe and the dehydrating unit; Dehydrating unit links to each other with porous material conveying device air inlet port, is provided with first pressure meter and second control valve between dehydrating unit and the porous material conveying device successively; Porous material conveying device discharging opening is connected with the final section drilling rod afterbody of rig through becoming head, is provided with second pressure meter and the 3rd control valve successively between porous material conveying device and the change head, and the front end of drilling rod is connected with drill bit.
2. system of collapsing of the down-hole coal bed boring of protection is characterized in that: described drill bit is that to contain a diameter be the exhaust opening that is not less than 22mm.
3. a kind of system that prevents that down-hole coal bed boring from collapsing according to claim 1, it is characterized in that: described porous material is spherical, and diameter is 1/6 ~ 1/4 of a drilling rod internal diameter, and inside is pore structure, porosity is between 0.3 ~ 0.8, and density is 100 ~ 1000kg/m
3, porous material is made by polyurethane resin.
4. a kind of system that prevents that down-hole coal bed boring from collapsing according to claim 1 is characterized in that: described porous material conveying device contains a porous material conveying device air inlet port, a porous material conveying device discharging opening, a porous material conveying device charge door and a seal cover; Porous material conveying device air inlet port and porous material conveying device discharging opening are on the same horizon, porous material conveying device charge door Way in is vertical with porous material conveying device inlet port direction, and seal cover is positioned at porous material conveying device charge door top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310138799.6A CN103216259B (en) | 2013-04-22 | 2013-04-22 | System protecting underground coal bed hole drilling from collapse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310138799.6A CN103216259B (en) | 2013-04-22 | 2013-04-22 | System protecting underground coal bed hole drilling from collapse |
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| Publication Number | Publication Date |
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| CN103216259A true CN103216259A (en) | 2013-07-24 |
| CN103216259B CN103216259B (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310138799.6A Active CN103216259B (en) | 2013-04-22 | 2013-04-22 | System protecting underground coal bed hole drilling from collapse |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234660A (en) * | 2014-09-03 | 2014-12-24 | 安徽理工大学 | Filling method for gas extraction hole |
| CN107905763A (en) * | 2017-12-20 | 2018-04-13 | 中国矿业大学(北京) | A kind of mash gas pumping drilling Stability Maintenance material and installation aiding device and method |
Citations (5)
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|---|---|---|---|---|
| UA76863C2 (en) * | 2004-11-12 | 2006-09-15 | M S Poliakov Inst Of Geo Techn | Method for formation of network of gas-conducting cracks in rock massif |
| CN101446178A (en) * | 2008-11-13 | 2009-06-03 | 煤炭科学研究总院西安研究院 | Wind pressure air drilling equipment in downhole soft outbursting coal bed and process matched therewith |
| CN102155256A (en) * | 2011-03-10 | 2011-08-17 | 贵州铸安矿山科技股份有限公司 | Method for preventing gas extraction hole from collapsing |
| CN102587828A (en) * | 2012-03-06 | 2012-07-18 | 中国矿业大学 | Gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and process |
| CN102747953A (en) * | 2012-03-06 | 2012-10-24 | 中国矿业大学 | Multiple step type drilling and protecting integrated system and process for soft coal seam |
-
2013
- 2013-04-22 CN CN201310138799.6A patent/CN103216259B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA76863C2 (en) * | 2004-11-12 | 2006-09-15 | M S Poliakov Inst Of Geo Techn | Method for formation of network of gas-conducting cracks in rock massif |
| CN101446178A (en) * | 2008-11-13 | 2009-06-03 | 煤炭科学研究总院西安研究院 | Wind pressure air drilling equipment in downhole soft outbursting coal bed and process matched therewith |
| CN102155256A (en) * | 2011-03-10 | 2011-08-17 | 贵州铸安矿山科技股份有限公司 | Method for preventing gas extraction hole from collapsing |
| CN102587828A (en) * | 2012-03-06 | 2012-07-18 | 中国矿业大学 | Gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and process |
| CN102747953A (en) * | 2012-03-06 | 2012-10-24 | 中国矿业大学 | Multiple step type drilling and protecting integrated system and process for soft coal seam |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234660A (en) * | 2014-09-03 | 2014-12-24 | 安徽理工大学 | Filling method for gas extraction hole |
| CN104234660B (en) * | 2014-09-03 | 2017-02-01 | 安徽理工大学 | Filling method for gas extraction hole |
| CN107905763A (en) * | 2017-12-20 | 2018-04-13 | 中国矿业大学(北京) | A kind of mash gas pumping drilling Stability Maintenance material and installation aiding device and method |
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| Publication number | Publication date |
|---|---|
| CN103216259B (en) | 2015-01-14 |
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