CN110374497A - A kind of drilling equipment and its boring method in fire damp hole - Google Patents
A kind of drilling equipment and its boring method in fire damp hole Download PDFInfo
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- CN110374497A CN110374497A CN201910820701.2A CN201910820701A CN110374497A CN 110374497 A CN110374497 A CN 110374497A CN 201910820701 A CN201910820701 A CN 201910820701A CN 110374497 A CN110374497 A CN 110374497A
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- 238000005553 drilling Methods 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 47
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 103
- 238000007789 sealing Methods 0.000 claims abstract description 78
- 238000005065 mining Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000003245 coal Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011435 rock Substances 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 230000006837 decompression Effects 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 22
- 238000005119 centrifugation Methods 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 239000003566 sealing material Substances 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 8
- 239000002826 coolant Substances 0.000 abstract description 6
- 230000008033 biological extinction Effects 0.000 abstract description 4
- 230000002706 hydrostatic effect Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000003795 desorption Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
- E21B21/015—Means engaging the bore entrance, e.g. hoods for collecting dust
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The drilling equipment and its boring method in a kind of fire damp hole disclosed by the invention, it spuds in collar aperture in mining region first, in the fixed sealing of hole casing of orifice sealing, then drilling equipment is connected on sealing of hole casing, by hollow drill to pressurization injection coolant liquid in drilling when drilling, play the role of supporting hole wall, after the hole of rock stratum section penetrates, the pressurization injection slurry coat method in rock stratum, certain hydrostatic pressure is formed in hole, it can play the role of firm palisades, it is crept into after into coal seam using clear water, the grain slag generated in drilling process is separated by slag separation device, realize the secondary use of resource, it is to be drilled when proceeding to whole hole, mining pipeline is replaced under pressurized state in hole, carry out slowly decompression mining, using the method for slow decompression mining, it can be avoided the quick effect of appearance speed, the problem of by the blocking of hole wall gap, drop The extinction efficiency of the gas amount in present low gas hole improves the extraction amount of gas.
Description
Technical field
The present invention relates to underground coal mine mash gas extraction technical field, the drilling equipment in specially a kind of fire damp hole and its
Boring method.
Background technique
Coal mine highly gassy mine draws out methane gas emission when can be with exploitation reducig, reduces gas hidden danger and various watts
This accident is a preventive measure for guaranteeing safety in production.Mash gas extraction can reduce ventilation burden, can release ventilation not
The gas problem easily solved reduces ventilation expense, mine or exploiting field especially for high methane, gas drainage under suction technology in safety
It is all above and economically necessary.
Coal-bed gas is taken out in this coal seam in advance and the lane Di Chou layer-through drilling takes out coal-bed gas in advance, is all that coal mine administers gas and prevention and treatment
One of the important means of coal and gas prominent carries out release to coal body using extraction drilling, reduces coal gas pressure by extraction
Power and gas bearing capacity, to achieve the purpose that extinction and safety in production.But either this drainage from coal seam, top plate rock gangway downlink are worn and are adopted
Or the uplink extraction of the lane Di Chou, during coal bed gas extraction, the easily-deformable, phenomena such as collapsing that drills, can greatly drop frequent occurrence
Low Completion of Drilling Hole rate, reduces gas drainage efficiency, increases extraction cost, seriously limit mine gas extraction it is up to standard into
Journey.The special lane Di Chou drilling is pre- to take out coal-bed gas, since drilling will pass through rock stratum, coal seam interface can generate stress and concentrate, coal
Layer is different with Poisson's ratio with rock stratum compression strength, and the axis and interface normal of drilling will also have certain angle, so easily collapsing
Hole bit freezing seriously affects extracting result, and the gas density extracted out is very low.
If downlink layer-through drilling of constructing in Jin Mei group Hu ground coal industry top plate rock gangway drill site is to 1301 track crossheadings and adhesive tape
Crossheading coal roadway stripe gas is taken out in advance, in actual borehole work progress, collapse hole, not return slag, string hole phenomena such as take place frequently, drill
One-tenth porosity is only 70% or so, and single hole concentration is below 30% substantially and decaying is fast, and hundred meters of coal hole flows are only 0.03m3/
Minhm, far from the requirement for meeting mine safety production；Be exactly coal seam horizontal drilling extraction there is also collapse hole, bit freezing,
The problems such as hole, single hole concentration bottom, the decaying of single hole gas amount go here and there quickly, it is necessary to be improved by new technical method.
Summary of the invention
Aiming at the problem that fire damp hole in the prior art is easy collapse hole, the present invention provides a kind of drilling in fire damp hole
Device and its boring method improve the one-tenth porosity in gas hole, improve the extraction efficiency of gas, improve gas extraction concentration, reduce
Extraction cost.
The present invention is to be achieved through the following technical solutions:
A kind of drilling equipment in fire damp hole, including drilling rod, pressure retaining valve, tee tube, sound combination sealing arrangement, drilling machine
And slag separation device；
The sealing of hole casing connection of one end of the pressure retaining valve and the oral area for being mounted on gas hole, the other end of pressure retaining valve and three
The connection of siphunculus entrance, tee tube outlet are connect with one end of sound combination sealing arrangement, the grain slag outlet connection grain slag of tee tube
Separator connection；
The drilling rod of drilling machine sequentially pass through sound combination sealing arrangement, tee tube, pressure retaining valve and sealing of hole casing to coal rock layer into
Row drilling, sound combination sealing arrangement are used to be sealed drilling rod and tee tube and clamping brill when dismounting drilling rod and drilling
Bar makes in drilling in pressurized state.
Preferably, the slag separation device includes drainpipe, centrifugation water-slag separator and storage slag cylinder；
Wherein, centrifugation water-slag separator is connected by the slag liquid delivery outlet that grain slag enters pipe and tee tube, centrifugation grain slag point
From drainpipe is provided at the top of device, the slag-drip opening for being centrifuged water-slag separator is connect by gate valve with the entrance for storing up slag cylinder, stores up slag
The outlet of cylinder is provided with scum gate valves, and when grain slag separates, gate valve and scum gate valves are alternately opened.
Preferably, it is additionally provided with hydraulic-pressure regulating valve on the drainpipe, the pressure in rate and drilling for adjusting draining
Power.
Preferably, the centrifugation water-slag separator is cylindrical structure, and grain slag enters end and the centrifugation water-slag separator of pipe
The point of contact of outer wall connects, and so that the grain slag entered in water-slag separator is done centrifugal rotation along barrel and moves.
Preferably, it is additionally provided with pressure charging valve between the sealing of hole casing and pressure retaining valve, is additionally provided with pressure gauge on pressure charging valve；
Pressure charging valve is three-way valve, one end of pressure charging valve and sealing of hole casing connection, and pressurization mouth passes through pipeline and high-pressure hydraulic pump
Connection.
The present invention also provides a kind of boring methods of the drilling equipment in fire damp hole, include the following steps；
S1, one is carried out in the wall in the lane Di Chou methane drawing region spud in hole, in the end tripping in sealing of hole set of drilling
It manages and drilling equipment is installed；
S2, starting drilling equipment carry out two and spud in hole；
When wall is rock stratum, drilled by drilling rod to the cooling dreg discharging liquid of pressurization injection slurry coat method in hole, to
After drilling through coal-rock detection face preset distance, using the cooling dreg discharging liquid drilling of clear water, until whole hole；
When wall is coal seam, crept by drilling rod to the cooling dreg discharging liquid of the injected clear water that pressurizes in hole, until eventually
Hole；
S3, close pressure retaining valve, and by pressure in high-pressure hydraulic pump and pressure charging valve ftercompction retaining hole it is constant in the state of, disassembly
Drilling equipment connects mining pipeline system, carries out decompression mining gas.
Preferably, in step S1 one spud in hole drilling 5-50m after, in hole be packed into sealing of hole casing, and use sealing material
Fill the gap between sealing of hole casing and drilling.
Preferably, it is crept into step S2 by the cooling dreg discharging liquid of drilling rod pressurization injection slurry coat method, makes mud in hole
One layer of pit protection mud cake is formed on wall, it is hole to be drilled behind 2-20 meters of coal-rock detection face, the cooling dreg discharging liquid of slurry coat method is changed to
Clear water cools down dreg discharging liquid, continues drilling until whole hole.
Preferably, in step S3, drilling rod is lengthened or removed section by section by sound combination sealing arrangement, extracts pressure maintaining out to drill bit
After valve, pressure retaining valve, disassembly sound combination sealing arrangement, drilling machine and slag separation device are closed, and connect in the end of pressure retaining valve
Mining pipeline system.
Preferably, it is as follows that it is specifically depressured mining gas method in step S3, opens pressure retaining valve, opens mining system, discharges water
It is depressurized to pressure in hole and reaches setting mining pressure, persistently carry out gas mining in the case where setting mining pressure.
Compared with prior art, the invention has the following beneficial technical effects:
The drilling equipment in fire damp hole provided by the invention, the sealing of hole set including being sealingly mounted at gas orifice position
One end of pipe, sealing of hole casing and tee tube connects, and the other end of tee tube is connect with sound combination sealing arrangement, and sound combination is close
Seal apparatus is connect with drilling machine, injects cooling dreg discharging liquid to drill bit cooling, device to hole to pressurization in hole by hollow drill when drilling
Wall plays certain supporting role, solves the problems, such as hole wall collapse, improves gas extraction concentration, and drilling rod dynamic sealing is combined in sound
In sealing device, in installation or dismounting drilling rod, hole internal pressure loss is avoided, hole wall collapse is in turn resulted in, is produced in drilling process
Raw grain slag enters slag separation device, and slag separation device is controlled by valve, to water the case where not reducing pressure in hole
Slag is separated, and guarantees the one-tenth porosity in gas hole.
A kind of boring method in fire damp hole provided by the invention spuds in tripping in sealing of hole in hole in mining region one first
Casing, then connects drilling equipment on sealing of hole casing, two spud in hole when by hollow drill to pressurization injection retaining wall in drilling
Mud cools down dreg discharging liquid, hole to be drilled to pass through coal-rock detection face, and slurry coat method forms one layer of slurry coat method layer in hole wall, plays support
The effect of hole wall, while the cooling dreg discharging liquid of slurry coat method forms certain hydrostatic pressure in hole, can play firm palisades
Effect, into coal seam after crept into using clear water, it is to be drilled to replace mining pipeline under pressurized state in hole when proceeding to whole hole, carry out
Slowly decompression mining can be avoided the quick effect of appearance speed, asked what hole wall gap blocked using the method for slow decompression mining
Topic reduces the extinction efficiency of the gas amount in gas hole, while using positive pressure mining, can be improved the concentration of gas, also raising watt
This extraction amount.
Detailed description of the invention
Fig. 1 is the usage state diagram of drilling equipment of the present invention；
Fig. 2 is the structure chart of slag leaf separator of the present invention.
In figure: 1, drilling rod；2, rock mass；3, sealing material；4, sealing of hole casing；5, pressure retaining valve；6, tee tube；7, sound combines
Sealing device；8, slag separation device；9, hydraulic-pressure regulating valve；10, drainpipe；11, it is centrifuged water-slag separator；12, grain slag enters
Pipe；13, gate valve；14, slag cylinder is stored up；15, scum gate valves；16, slag-drip opening；17, drilling machine.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, described to be explanation of the invention rather than limit
It is fixed.
Refering to fig. 1 and Fig. 2, a kind of drilling equipment in fire damp hole, including drilling rod 1, sealing of hole casing 4, pressure retaining valve 5, three
Siphunculus 6, sound combination sealing arrangement 7, drilling machine 17 and slag separation device.
Wherein, the drilling rod 1 is connect with drilling machine 17,1 hollow structure of drilling rod, when drilling by by the inner hole of drilling rod 1 to
Forced feed coolant liquid in the hole of coal rock layer is cooled down for the drill bit to 1 end of drilling rod, meanwhile, coolant liquid can will be cut
The landwaste cut is gone out from drilling, and plays the role of supporting hole wall.
4 sealing shroud of sealing of hole casing is mounted in the oral area in gas hole, and the oral area of sealing of hole casing 4 is connect with one end of pressure retaining valve 5, protects
The other end of pressure valve 5 is connect with 6 entrance of tee tube, and the outlet of tee tube 6 is connect with one end of sound combination sealing arrangement 7, drilling machine
17 drilling rod 1 sequentially passes through sound combination sealing arrangement 7, tee tube 6, pressure retaining valve 5 and sealing of hole casing 4 and drills to coal seam.
Pressure retaining valve 5 is in normally open in boring procedure, and drilling rod 1 passes through pressure retaining valve 5 and carries out driller's operation, when having drilled
Cheng Hou needs to disassemble in tee tube 6, quiet combination sealing arrangement 7 and drilling machine 17, gas mining pipeline is replaced, at this point, pressure retaining valve
It is in close state, prevents gas hole from collapsing in pressurized state in drilling for making.
Sound combination sealing arrangement 7 is used to carry out drilling rod and tee tube 6 during dismounting drilling rod 1 and drilling close
Envelope makes in pressurized state in drilling, and sound combination sealing arrangement 7 is Operating Pressure sealing device, preferably oil field work with pressure
Industry sealing device.
Slag separation device 8 includes hydraulic-pressure regulating valve 9, drainpipe 10, centrifugation water-slag separator 11 and storage slag cylinder 14.
Wherein, grain slag being provided on centrifugation water-slag separator 11 and entering pipe 12, grain slag enters one end and the centrifugal water of pipe 12
Pulp separator 11 is connected to, and grain slag enters the other end of pipe 12 and connect with the slag liquid delivery outlet of tee tube 6, and grain slag is entered by grain slag
Pipe 12 enters centrifugation water-slag separator 11 and carries out grain slag separation.
The centrifugation water-slag separator 11 is cylindrical structure, and lower end is circular cone structure, is centrifuged the top of water-slag separator 11
Portion is provided with drainpipe 10, and the outlet of drainpipe 10 is provided with hydraulic-pressure regulating valve 9, can adjust drilling by hydraulic-pressure regulating valve 9
Pressure when operation in gas hole prevents from causing machined hole to cause to collapse because pressure reduces in boring procedure.Hydraulic pressure is adjusted
The outlet of valve 9 is connect with catch basin, and the water of discharge after precipitation and purification, is convenient for secondary use in catch basin.
Grain slag enters the end of pipe 12 and connect with the point of contact of centrifugation 11 outer wall of water-slag separator, grain slag under pressure into
Entering to be centrifuged in water-slag separator 11, water is precipitated to the bottom for being centrifuged water-slag separator 11 along its side wall rotational flow, slag body, into
And realize the centrifuge separation of grain slag, the water after separation drains into catch basin by drainpipe.
The outlet at bottom of centrifugation water-slag separator 11 is provided with gate valve 13, and the outlet of gate valve 13 and the entrance of storage slag cylinder 14 connect
It connects, the outlet at bottom of storage slag cylinder 14 is provided with scum gate valves 15, and scum gate valves 15 is connect with slag-drip opening.
After grain slag separates in centrifugation water-slag separator 11, gate valve 13 is opened, slag enters storage slag cylinder 14 by gate valve 13, by
It is closed in scum gate valves 15, therefore the pressure in drilling will not be reduced, pressure is avoided to reduce the collapsing for causing gas hole.
After slag enters storage slag cylinder 14, then closing gate valve 13 opens scum gate valves 15 again, make slag from 16 row of slag-drip opening
Out, in the process, since gate valve 13 is closed, the pressure in drilling will not be reduced, pressure reduction is avoided to cause gas hole
Collapsing.
Further, it prevents from causing gas pore pressure force when rigging down 17 and tapping process, dismounting drilling rod and gas extraction
Reduce, pressure charging valve is additionally provided between sealing of hole casing 4 and pressure retaining valve, pressure charging valve is three-way valve, input end and sealing of hole casing 4
Connection, outlet end are connect with pressure retaining valve 5, and pressurization mouth is connect by fluid pipeline with high-pressure hydraulic pump, and coolant liquid passes through fluid pipeline
In pressurization injection gas hole, for adjusting the pressure in gas hole.
Further, for the ease of the pressure in monitoring gas hole, it is provided with pressure gauge on pressure retaining valve 5, is checked for implementing
Pressure in gas hole.
Drilling equipment provided by the invention, the sealing of hole casing including being sealingly mounted at orifice position, sealing of hole casing and threeway
One end of pipe connects, and the other end of tee tube is connect with sound combination sealing arrangement, and sound combination sealing arrangement is connect with drilling machine,
It is cooling to drill bit to the cooling dreg discharging liquid of pressurization injection in hole by hollow drill in drilling, extend the service life of drill bit, together
When certain supporting role is played to hole wall, solve the problems, such as hole wall collapse, drilling rod dynamic sealing in sound combination sealing arrangement,
When installing additional or dismantling brill, avoids depressurizing loss in hole, in turn result in hole wall collapse, the grain slag generated in drilling process enters water
Slag separator, slag separation device are controlled by valve, are separated the case where not reducing pressure in hole to grain slag, are guaranteed
The one-tenth porosity in gas hole.
The boring method in gas hole provided by the invention is described in detail below.
A kind of boring method in fire damp hole, comprising the following steps:
S1, one is carried out on the coal seam or rock stratum in the lane Di Chou methane drawing region spud in hole, and sealing of hole casing 4 sealed solid
It is scheduled on the oral area of drilling, the specific method is as follows:
Firstly, in the lane Di Chou, the upward certain angle in rock stratum 2 of top plate creeps into 5-50m, or in coal petrography using 120mm drill bit
Layer horizontal drilling, the tripping in sealing of hole casing 4 in hole fill sealing material 3 between sealing of hole casing and hole, carry out to sealing of hole casing
Sealing is fixed, and sealing fixation should meet pressure requirements in hole.
S2, drilling equipment is connected in the end of sealing of hole casing 4.
The end of sealing of hole casing 4 connects pressure retaining valve 5, and the other end of pressure retaining valve connects tee tube 6, the other end of tee tube 6
Sound combination sealing arrangement 7 is connect, the slag liquid delivery outlet of tee tube 6 is connect with slag separation device, and drilling machine 17 is arranged in sound group
The other end of sealing device 7 is closed, the drilling rod of drilling machine 17 passes through sound combination sealing arrangement 7 and protrudes into collar aperture.
S3, starting drilling equipment carry out two and spud in hole
When wall is rock stratum, drilled by drilling rod to the cooling dreg discharging liquid of pressurization injection slurry coat method in hole, to
After drilling through coal-rock detection face certain distance, using the cooling dreg discharging liquid drilling of clear water until whole hole；
When wall is coal seam, crept by drilling rod to the cooling dreg discharging liquid of the injected clear water that pressurizes in hole, until eventually
Hole；
Drilling rod, the drilling depth of control hole, grain slag separation dress are installed additional by sound combination sealing arrangement 7 during drilling
It sets and the grain slag of discharge is separated.
It is specific as follows:
Two spud in into when the bit diameter that uses spud in less than one into when bit diameter, two spud in into when, using diameter
It is crept into according to planned course to design length end hole for 94mm drill bit.
During drilling, drilling machine 17 supplies the cooling row of 1.5-10MPa into coal rock layer hole by hollow drilling rod 1
Slag liquid, the landwaste for cooling down drill bit and while going out drilling generates, while cooling dreg discharging liquid can balance hole wall and ground lamination
Power makes hole wall not fall off collapse hole.Sound combination sealing arrangement 7 can bore sealing in drilling, replacement drilling rod and tool joint
Bar 1 and sealing of hole casing 4 avoid the pressure in hole lower than predetermined pressure, cause collapse hole.
Predetermined pressure is greater than the parsing pressure of gas, is less than strata pressure.
When rock stratum is crept into, is crept into using the cooling dreg discharging liquid of slurry coat method, is pressurizeed by drilling rod and inject slurry coat method,
Because mud can form support protection mudcake in hole wall, pressure injection slurry coat method just generates certain hydrostatic pressure in hole, can
With firm palisades, prevent collapse hole.In addition, mud can also seep the gap for boring wall, packing is real, and one layer of fine and close water penetration of formation is very
Low mudcake avoids having certain hydraulic pressure in hole inner wall leak and retaining hole, facilitates the stabilization for safeguarding hole wall.In addition, mud has
There is higher stickiness, the broken native rock ballast bits of cutting can be suspended by circulating mud, be easily discharged out of the hole, play in company with mud
Take the effect of slag, casting.Simultaneously as mud circulation makees flushing liquor, thus there is cooling and lubricating action to drill bit, mitigates drill bit
Abrasion.
It drills through behind coal-rock detection face after 2-20 meters, using clear water drilling with pressure until whole hole.
In entering coal seam, injected clear water is pressurizeed as coolant liquid by drilling rod and carries out bore operation until whole hole, uses
Clear water is avoided seeping in hole wall gap and be filled out as coolant liquid, causes gas that cannot be discharged, and drilling makes the grain slag of discharge enter grain slag point
It is separated from device.
Grain slag enters tee tube by pressure retaining valve 5, enters centrifugation water-slag separator 11 from tee tube 6 and carries out grain slag separation,
The water isolated is expelled to catch basin into hydraulic-pressure regulating valve 9 is crossed, while the aperture by adjusting hydraulic-pressure regulating valve 9 adjusts displacement
Pressure in retaining hole, avoids hole wall collapse.
When being centrifuged that debris proceeds to a certain amount of in water-slag separator 11, gate valve 13 is opened, scum gate valves 15 is closed, is protecting
It holds in hole and debris to be discharged into storage bits bucket 14 under pressure state, closing gate valve 13 opens scum gate valves 15, and debris is from slag-drip opening 16
Discharge, deslagging terminate, and close scum gate valves 15, repeat the process of the step until whole hole.
During deslagging or installation drilling rod, pressure in hole is easy to cause certain decompression occur, passes through pressure valve reality
When monitoring holes in pressure liquid line is connected by pressure charging valve when pressure is less than predetermined pressure, pressurization injection liquid in device to hole
Body makes the pressure in hole be maintained at predetermined pressure；
During installing drilling rod additional, hydraulic-pressure regulating valve 9, pressure reduction in anti-hole are closed.
S4, keep drill in pressure it is constant in the state of, dismantle drilling equipment, connect mining pipeline system.
Drilling rod is removed section by section by sound combination sealing arrangement 7, after drill bit extracts pressure retaining valve 5 out, is closed pressure retaining valve 5, is torn open
Sound combination sealing arrangement 7, drilling machine 17 and slag separation device 8 are unloaded, and connects mining pipeline system in the end of pressure retaining valve 5.
S5, open pressure retaining valve 5, open mining system, discharge water be depressurized to pressure in hole reach setting mining pressure, setting
Gas mining is persistently carried out under mining pressure.
During mining, when the pressure in gas hole is lower than predetermined pressure, it is pressurized by pressure charging valve, prevents hole
Wall collapses, while passing through pressure in the anti-water of adjusting also adjustable gas hole.
During mining, when reservoir pressure is reduced to critical desorption pressures or less, methane gas is from the micro- sky of matrix of coal
Gap inner surface desorbs, and the fissure system of coal is diffused into due to gas density difference, finally the stream in the form of Darcy Flow
It moves to hole, is produced by mining pipeline system.
Wherein, desorption is the premise that coal bed gas carries out mining, and decompression is the premise of desorption, it can be seen that, ground drilling coal
What can layer gas occur is whether coal bed gas can depressurization desorption at all.Existing negative pressure mining, energy are changed using positive pressure mining
The concentration and extraction amount of mining gas are enough greatly improved, while avoiding that the quick effect of speed occurs, caused hole wall gap blocking is asked
Topic, extends the time of mining.
A kind of boring method in fire damp hole provided by the invention spuds in collar aperture first in mining region, in aperture
Fixed sealing of hole casing is sealed, then connects drilling equipment on sealing of hole casing, by hollow drill to pressurization in drilling when drilling
The cooling dreg discharging liquid of slurry coat method is injected, plays the role of supporting hole wall, it is hole to be drilled to be crept into behind coal-rock detection face using clear water,
The grain slag generated in drilling process is separated by slag separation device, realizes the secondary use of resource, to be drilled to proceed to whole hole
When, mining pipeline is replaced under pressurized state in hole, carries out slowly decompression mining, it, can using the method for slow decompression mining
The quick effect of speed is avoided the occurrence of, the problem of hole wall gap is blocked, the extinction efficiency of the gas amount in gas hole is reduced, improves gas
Concentration and extraction amount.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (10)
1. a kind of drilling equipment in fire damp hole, which is characterized in that including drilling rod (1), pressure retaining valve (5), tee tube (6), move
Quiet combination sealing arrangement (7), drilling machine (17) and slag separation device (8)；
One end of the pressure retaining valve (5) is connect with the sealing of hole casing (4) for the oral area for being mounted on gas hole, pressure retaining valve (5) it is another
End is connect with tee tube (6) entrance, and tee tube (6) outlet is connect with one end of sound combination sealing arrangement (7), tee tube (6)
Grain slag outlet connection slag separation device (8) connection；
The drilling rod (1) of drilling machine sequentially passes through sound combination sealing arrangement (7), tee tube (6), pressure retaining valve (5) and sealing of hole casing (4)
Coal rock layer is crept into, sound combination sealing arrangement (7) is used for when dismounting drilling rod and drilling, to drilling rod and tee tube (6)
It is sealed and clamping drilling rod, makes in drilling in pressurized state.
2. the drilling equipment in fire damp hole according to claim 1, which is characterized in that the slag separation device includes row
Water pipe (10), centrifugation water-slag separator (11) and storage slag cylinder (14)；
Wherein, centrifugation water-slag separator (11) enters pipe (12) by grain slag and connect with the slag liquid delivery outlet of tee tube (6), is centrifuged
Be provided at the top of water-slag separator (11) drainpipe (10), centrifugation water-slag separator (11) slag-drip opening by gate valve (13) with
Store up slag cylinder (14) entrance connection, storage slag cylinder (14) outlet be provided with scum gate valves (15), grain slag separate when, gate valve (13) and
Scum gate valves (15) is alternately opened.
3. the drilling equipment in fire damp hole according to claim 2, which is characterized in that also set up on the drainpipe (10)
There are hydraulic-pressure regulating valve (9), the pressure in rate and drilling for adjusting draining.
4. the drilling equipment in fire damp hole according to claim 2, which is characterized in that the centrifugation water-slag separator (11)
For cylindrical structure, the end that grain slag enters pipe (12) connect with the point of contact of centrifugation water-slag separator (11) outer wall, makes to enter grain slag
Grain slag in separator can do centrifugal rotation along barrel and move.
5. the drilling equipment in fire damp hole according to claim 1, which is characterized in that the sealing of hole casing (4) and pressure maintaining
It is additionally provided with pressure charging valve between valve (5), is additionally provided with pressure gauge on pressure charging valve；
Pressure charging valve is three-way valve, and one end of pressure charging valve is connect with sealing of hole casing (4), and pressurization mouth is connected by pipeline and high-pressure hydraulic pump
It connects.
6. a kind of boring method of the drilling equipment based on the fire damp hole any one of claim 1-5, which is characterized in that
Include the following steps；
S1, one is carried out in the wall in the lane Di Chou methane drawing region spud in hole, in the end tripping in sealing of hole casing (4) of drilling
And drilling equipment is installed；
S2, starting drilling equipment carry out two and spud in hole；
When wall is rock stratum, drilled by drilling rod to the cooling dreg discharging liquid of pressurization injection slurry coat method in hole, it is hole to be drilled
After the preset distance of coal-rock detection face, using the cooling dreg discharging liquid drilling of clear water, until whole hole；
When wall is coal seam, crept by drilling rod to the cooling dreg discharging liquid of the injected clear water that pressurizes in hole, until whole hole；
S3, pressure retaining valve (5) are closed, and by pressure in high-pressure hydraulic pump and pressure charging valve ftercompction retaining hole it is constant in the state of, disassembly
Drilling equipment connects mining pipeline system, carries out decompression mining gas.
7. boring method according to claim 6, which is characterized in that in step S1 one spud in hole drilling 5-50m after, in hole
Interior loading sealing of hole casing (4), and using the gap between sealing material filling sealing of hole casing (4) and drilling.
8. boring method according to claim 6, which is characterized in that pressurizeed in step S2 by drilling rod and inject slurry coat method
Cooling dreg discharging liquid is crept into, and mud is made to form one layer of pit protection mud cake on hole wall, hole to be drilled to pass through 2-20 meters of coal-rock detection face
Afterwards, the cooling dreg discharging liquid of slurry coat method is changed to the cooling dreg discharging liquid of clear water, continues drilling until whole hole.
9. boring method according to claim 6, which is characterized in that in step S3, pass through sound combination sealing arrangement (7)
Drilling rod is lengthened or removed section by section, after drill bit extracts pressure retaining valve (5) out, closes pressure retaining valve (5), dismantles sound combination sealing arrangement
(7), drilling machine (17) and slag separation device (8), and mining pipeline system is connected in the end of pressure retaining valve (5).
10. boring method according to claim 6, which is characterized in that be specifically depressured mining gas method in step S3 such as
Under, open pressure retaining valve (5), open mining system, discharge water be depressurized to pressure in hole reach setting mining pressure, setting mining pressure
Gas mining is persistently carried out under power.
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| CN111425138A (en) * | 2020-04-03 | 2020-07-17 | 重庆大学 | Soft outburst coal seam long drilling and hole forming system and method |
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| CN111894655A (en) * | 2020-06-24 | 2020-11-06 | 中国矿业大学 | Low-temperature fluid quick-freezing ice blocking method for gas extraction drill hole |
| CN111894460A (en) * | 2020-08-25 | 2020-11-06 | 河南理工大学 | Water slag removing device with integrated drill bit and hydraulic anti-reflection measure and using method |
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| CN111322009A (en) * | 2020-03-16 | 2020-06-23 | 陇东学院 | Downhole anti-orifice pressure-maintaining drilling method |
| CN111425138A (en) * | 2020-04-03 | 2020-07-17 | 重庆大学 | Soft outburst coal seam long drilling and hole forming system and method |
| CN111425138B (en) * | 2020-04-03 | 2024-04-30 | 重庆大学 | Long-drilled hole forming system and method for soft protruding coal seam |
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| CN117145403A (en) * | 2023-10-30 | 2023-12-01 | 烟台兴业机械股份有限公司 | Drilling device for medium-length hole trolley |
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