CN106320985A - High-pressure water jet punching-drilling-expanding-cutting integrated antireflection device for coal seam, and related method - Google Patents

High-pressure water jet punching-drilling-expanding-cutting integrated antireflection device for coal seam, and related method Download PDF

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Publication number
CN106320985A
CN106320985A CN201610834597.9A CN201610834597A CN106320985A CN 106320985 A CN106320985 A CN 106320985A CN 201610834597 A CN201610834597 A CN 201610834597A CN 106320985 A CN106320985 A CN 106320985A
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CN
China
Prior art keywords
pressure
slot
big
cylindrical
water
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CN201610834597.9A
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Chinese (zh)
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CN106320985B (en
Inventor
张东明
白鑫
王禹博
杨瀚
祖钒莹
樊增瑞
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重庆大学
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Classifications

    • 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
    • E21B10/00Drill bits
    • 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
    • E21B10/00Drill bits
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • 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
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • 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
    • E21B10/00Drill bits
    • E21B10/60Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/61Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
    • 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
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06Arrangements for treating drilling fluids outside the borehole
    • E21B21/063Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/067Separating gases from drilling fluids
    • 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
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/18Drilling by liquid or gas jets, with or without entrained pellets

Abstract

The invention discloses a high-pressure water jet punching-drilling-expanding-cutting integrated antireflection device for coal seam, which comprises a drilling machine, a drilling rod and a drill bit. The drill bit comprises a cylindrical body, wherein the front end of the body extends forward to form a cone-like reaming portion. A reaming cutter is fixed on the conical surface of the reaming cutter. The end face of the small head end of reaming portion extends forward to form a drilling cutter. The rear end of the body is extended backward to form a slitting portion, and the rear end of the slitting portion is fixedly connected with the drilling rod. Pore passages allowing liquid to pass through are provided in the reaming portion, the body and the slitting portion. The rear end of the pore passages is connected with the center hole of drilling rod. The front hole of the pore passages is provided with a punched hole nozzle. A horizontal slit nozzle is provided within the slitting portion, and the pore passages are also provided with a valve core. Therefore, the invention provides a punching-drilling-expanding-cutting integrated antireflection device for the coal seam, and also provides a method for the antireflection of the coal seam by using this punching-drilling-expanding-cutting integrated antireflection device, in order to effectively avoid the borehole deviation, improve the construction environment, reduce water waste and gas waste, and improve work efficiency.

Description

Coal seam high-pressure water jet rushes-bores-expand-cut integration permeability improvement device and method thereof
Technical field
The invention belongs to coal and gas production technical field, specifically, particularly to the high-pressure water jet punching of a kind of coal seam- Bore-expand-cut integration permeability improvement device and method thereof.
Background technology
At present, coal-bed gas is as one of cleaning high heating value energy, and its extraction is of great immediate significance.And China Coal-bed gas breathability is low, gas pumping difficulty, generally requires employing artificial-strengthening measure and carries out coal body fracturing, increases coal seam saturating Gas property coefficient, thus increase mine gas extraction rate, it is achieved coal-bed gas scale methane drainage and utilization project.The most traditional coal seam is anti-reflection Method mainly has hydrofracturing method and Deephole pre-splitting blasting method.But, the hydraulic pressure crack of fracturing is typically along maximum principal stress Directional Extension, relatively big by Geological Structure Effect, its fracturing crack often has certain directivity;And fracturing crack is expanded Exhibition direction is affected by coal bed texture has bigger uncertainty, causes coal body fracturing effect uneven.Deephole pre-splitting blasting increases The shock wave that saturating method utilizes explosive charge moment to produce carries out fracturing to coal body, can obtain and preferably apply effect.But, fried Medicine transport, boring are installed, the links such as detonate is equal it is possible that security incident;Application process such as occurring, explosive miss-fires, Cause residual explosive in boring, quite dangerous in processing procedure;And government's explosive management and control is strict, explosive examination and approval procedures are multiple Miscellaneous;Time actually used, explosive consumption is excessive causes coal body efflorescence serious, and explosive charge does not reaches preferable fracturing radius less.
High pressure water jet be last century the fifties start a new technique growing up, in the last thirty years, this Technology research and development at home and abroad is rapid.High-pressure water jet has transmission energy and concentrates, without abrasion, no-spark, depositing dust and adaptation Property the advantage such as strong, have been widely used the cleaning in the fields such as coal, oil, chemical industry, aviation, building, machinery, cut, crush Aspect.Coal industry is initially holed just with high pressure water jet, and in recent years, some scholars and scientific research institutions are at water Defeat to split and also been proposed the anti-reflection technology of high-pressure hydraulic slot on high-pressure water jet Research foundation: utilize special high-pressure hydraulic to cut Seaming standby, in coal seam, existing mash gas pumping drilling carrying out horizontal or vertical slot, increase the crack quantity in coal seam, make Stress of coal seam discharges, and increases the permeability in coal seam.High-pressure hydraulic slot rock breaking mechanism is different from straight jet, its broken rock machine Reason is mainly: on the one hand by the frontal impact of high-pressure water jet, and coal and rock generation stretching, water wedge effect are carried out brokenly rock, separately On the one hand in the crack that frontal impact is formed, produce horizontal load, make fissure-plane produce failure by shear and with erosion, stretching The complex process of the various ways effects such as destruction.Technology that high-pressure hydraulic slot is anti-reflection can form uniform slot in boring coal seam section, Realize coal mass relief, promote that coal body internal adsorption gas converts to free gas, increase coal body permeability coefficient, dramatically increase coal seam Gas pumping efficiency.
Existing underground coal mine high-pressure water jet boring technology and the achievement in research utilizing high-pressure water jet to carry out hydraulic slotted liner technique It is primarily present following defect:
One, in boring hydraulic slotted liner technique drilling process, owing to rock stratum is a kind of heterogeneous anisotropic material, and containing more Natural fissure and defect, drill bit, during grinding coal and rock, can offset along weakness direction, front, cause practice of construction to bore Hole site produces certain offset error with design bore position, has a strong impact on on-the-spot coal seam cutting and gas pumping effect;
Two, bore reaming and high-pressure hydraulic slot is two complete equipments, need first to carry out drilling construction, exit drilling rod peace the most again Dress hydraulic slotted liner technique drill bit, carries out waterpower cutting, expends the time long, and labor intensity is big, inefficiency.Further, must during more bit change Must all exit drilling rod, if drilling depth is very deep, then need to take longer time, during more bit change, frequent mounting or dismounting are bored Bar, accelerates drill rod abrasion, reduces drilling life of drill pipe;
Three, there is no relevant protection device in aperture, and down-hole coal bed in drilling process, owing to coal body is contained within substantial amounts of , there is bigger spray orifice dangerous in high pressure gas gas, easily causes drilling rod ejection, the leakage of a large amount of gas during drilling construction, Cause gas exceeding limit, even cause casualties;
Four, being not provided with waste water circulation recovery system, cause a large amount of hydrops of coal mine work area, field working conditions is severe, Limit the application at the scene of this technology;
Five, drill bit mainly breaks rock with rotary grinding is main creeping into, and drill bit is fragile, and boring Financial cost is big.
Summary of the invention
An object of the present invention is to provide a kind of coal seam high-pressure water jet to rush-bore-expand-cut integration permeability improvement device, In order to avoid borehole throw, and improve boring and hydraulic slotted liner technique efficiency.
The technical scheme that the present invention realizes one of purpose is as follows: a kind of coal seam high-pressure water jet rushes-bores-expand-cut integration Permeability improvement device, including rig, drilling rod and drill bit, described drilling rod is hollow structure, and described drill bit includes columned body, described The front end of body extends forward and forms coaxial circular cone shape reamer, and described reamer is pre-small post-large, at the conical surface of reamer Upper circumference is uniformly fixed with at least two cornish bit, and it is uniform extremely that the little head end end face of described reamer extends forward formation circumference Few three are bored tooth, and the rear end of described body extends rearwardly to form coaxial cylindric slot portion, and the radius ratio in described slot portion is originally The radius of body cylindrical section is little;The duct passed through for liquid is had, before described duct in described reamer, body and slot portion Hold the rear end in the through slot portion, rear end in the front end of through reamer, duct, punching spray is installed in the front aperture in described duct Mouth, is provided with at least one horizontal slot nozzle in described slot portion, the through slot portion, outer end of described slot nozzle All sidewalls, the inner of slot nozzle and hole link, in described duct, it is also equipped with spool, when hydraulic pressure is little, spool will cut The inner closing of seam nozzle, through before and after described duct, when hydraulic pressure is big, spool blocks forward the front portion in duct, simultaneously slot Nozzle the inner connects with rear portion, duct;The rear end in described slot portion is fixedly linked with drilling rod, and in the rear end in duct and drilling rod Central hole connects.
Using said structure, arrange reamer in body front end and bore tooth, rear end arranges slot portion, and in reamer, basis Arranging duct in body and slot portion, punching nozzle is installed in front end, duct, installs slot nozzle, and install in duct in slot portion Spool;When water under high pressure hydraulic pressure is less, spool by the inner closing of slot nozzle, water under high pressure via duct and punching nozzle to brill The coal body in front, hole carries out impacting and precrushing, can reduce resistance when creeping into so that bore tooth and cornish bit creeps into further Being easier to push ahead when grinding broken, drilling efficiency significantly improves, and High-Pressure Water can also cool down drill bit simultaneously;When having crept into Become when needing to carry out hydraulic slotted liner technique, it is not necessary to more bit change, only need to move back and get into appointment position and strengthen water under high pressure hydraulic pressure, make spool to The front portion in duct is blocked in front movement, and slot nozzle the inner connects with rear portion, duct simultaneously, and High-Pressure Water enters slot nozzle, along with The high speed rotating of drill bit forms radial impact force to coal body in hole and carries out hydraulic slotted liner technique.Thus provide a kind of coal seam high-pressure water shot Stream rushes-bores-expand-cut integration permeability improvement device, by pressure water jets impact rock mass or coal body, reduces boring front coal petrography mechanics Character, and form high-pressure hydraulic hole in boring front coal and rock, guide brill tooth to creep into along high pressure water impact hole, due to height Pressure water jet direction remains along drill bit axis direction, and therefore its impact is made acupuncture point and put and be in drill bit axis direction all the time, i.e. Design boring direction, bores tooth front coal body mechanical property after pressure water jets impact and reduces, and form guiding cave, thus protect Demonstrate,prove brill tooth to creep into along design direction all the time, reached pressure water jets impact and made the effect of cave orientation, efficiently avoid brill Hole deviation.Further, after being crept into by brill teeth drill bit, coal and rock internal orifice dimension increases, but still does not reaches mash gas pumping drilling aperture and want Ask, therefore devise expanding structure, make cave orientation at pressure water jets impact, bore after tooth creeps into perforate, by cornish bit along boring tooth The small size boring that grinding goes out carries out grinding reaming, and coal body has carried out precrushing due to impulse nozzle, bores tooth also to brill Hole has carried out once creeping into and grinding, coal body release in boring, when reaming blade carries out secondary abrasive expanding holes, pushes ahead Resistance be greatly reduced, grind more abundant, be more easy to discharge, work efficiency is greatly increased.Finally increase hydraulic pressure make punching-brill- Expanding-cut the spool forward slip in three grades of drill bits of integration, high-pressure water jet hydraulic blow pathway closure, water under high pressure sprays along slot Mouth sprays, and is rotated by rig, realizes slot function, finally considerably improve the effect of boring and hydraulic slotted liner technique in coal body Rate.
Described spool includes coaxial big cylindrical section, middle cylindrical section, roundlet shell of column and conical head, described great circle from back to front The radius of shell of column, middle cylindrical section and roundlet shell of column is sequentially reduced, and described conical head is pre-small post-large, and the stub end of conical head half Footpath is identical with the radius of roundlet shell of column, has, in described big cylindrical section and middle cylindrical section, the via being mutually communicated, described little The radial direction apopore that at least two circumference is uniform, the inner of described apopore and the via front end of middle cylindrical section is had in cylindrical section Connection;Described duct includes big cylindrical hole, big conical bore, big installing hole, little installing hole and small cylindrical opening from back to front, described greatly Cylindrical hole, big installing hole, little installing hole and small cylindrical opening all in the cylindrical hole coaxial with body, described big conical bore in body Coaxial and pre-small post-large conical bore, the rear end face in the through slot portion, rear end of described big cylindrical hole, the corresponding big cylinder in slot portion The position in hole is connected with drill rod thread;The front end face of the through reamer in front end of described small cylindrical opening, described punching nozzle is installed Front end at duct small cylindrical opening;Described big installing hole, between little installing hole and small cylindrical opening all in step transition, and little It is fixed with packing ring on step surface in installing hole, and described big mounting hole site is in slot portion, the inner of described slot nozzle Connect with the rear portion of big installing hole, be installed with annular retaining ring in the rear end of described big installing hole, the big cylindrical section of described spool and Middle cylindrical section is slidably matched with big installing hole and little installing hole respectively, at spool big cylindrical section front end and duct big installing hole inner bottom Between pad equipped with spring, under the action of the spring, described spool pushes against with back-up ring backward, and the big cylindrical section of described spool is by slot The inner closing of nozzle;When hydraulic pressure strengthens, when hydraulic pressure overcomes the pressure of spring to promote spool to move forward, the taper of described spool Small cylindrical opening is stretched in head front end, and the conical surface of conical head pushes against with packing ring, duct closed front, the inner of described slot nozzle Connect with big installing hole.Described spool and the simple in construction in duct, easy for installation, coordinating between spool with duct is stable and anti- Should be sensitive.
Described brill tooth rim, to being evenly equipped with three, is respectively and fixedly provided with abrasive grains, described grinding in the front end of each described brill tooth Granule is made up of diamond particles, and described brill tooth is in fan-shaped column, and the front end face at each described brill tooth is all inlaid with three and grinds Abrasive particle.Brill tooth and abrasive grains is so set, on the one hand adds brill tooth intensity, extend brill tooth service life, the opposing party Face enhances the abrasive action boring tooth, reduces the grinding difficulty boring tooth, is effectively improved drilling efficiency.
Described cornish bit is diamond blade, and the cornish bit circumference on the described reamer conical surface is evenly equipped with three, and expands Hole cutter just middle to adjacent brill space width, the top of each described cornish bit is all in circular arc.
Described drilling rod away from drill bit one end connect have high pressure water circuit, described high pressure water circuit to include by high-pressure water pipe successively The water guide tail connected connects, the first water pump, the first valve and the first sump, and described water guide tail connects and is fixedly connected on drilling rod away from drill bit One end, connect at water guide tail and the second valve be installed, described first water pump is provided with the first Pressure gauge.Water under high pressure is set Road provides water under high pressure for drill bit, and wherein the first valve is in sump exit, is used for controlling water yield size;Is arranged on first water pump One Pressure gauge, can show that in work progress, hydraulic pressure dynamically changes;Connect at water guide tail and be provided with the second valve to control high pressure Discharge.In high pressure water circuit, the first water pump is by the capital equipment that hydraulic pressure promotes, and the high-pressure hydraulic pump of selection should have multistage Regulatory function, minimum have 4 grades of regulatory functions, can be according to boring object implementatio8 regulation, and maximum output hydraulic pressure should meet 120MPa, high-pressure water pipe bearing capacity need to be 1.2 times of high-pressure hydraulic pump maximum output pressure.
Being also equipped with gas and water separator on described drilling rod, described gas and water separator includes being docked by ring flange Tubulose leading portion and back segment, described drilling rod passes from the centre bore of moisture trap, is set with rubber sleeve, rubber outside described leading portion The two ends of set seal and are fixed on leading portion, are provided with air-filled pore in the rear end of rubber sleeve;Two are had in the rear relatively in the middle part of section Via, one of them via of back segment is provided with extraction pipeline, described extraction pipeline is provided with the 3rd valve and Second Pressure gauge;Connecting on another via of back segment and have outlet pipeline, the other end of described outlet pipeline and the first sump are even Logical;The rear end of section connects in the rear has sealing ring, described seal ring set to be contained on drilling rod.Moisture trap is set, on the one hand Boring is closed, it is to avoid gas and waste water overflow aggravating working environment;On the other hand gas and waste water are collected, keep away During having exempted from drilling construction, coal-bed gas release causes gas exceeding limit, can reduce gas spray orifice in construction to a certain extent The extent of injury, had both decreased the waste of gas, had reduced again the potential safety hazard of boring procedure;And can realize in work progress The recycling of water.
Described outlet pipeline there also is provided the second sump and the second water pump, described second water pump be positioned at the second sump and Between first sump.Second sump and the second water pump are set, it is simple to the waste water collecting moisture trap precipitates.
The two of the purpose of the present invention are to provide a kind of coal seam high-pressure water jet to rush-bore-expand-cut integration anti-reflection method.
The technical scheme that the present invention realizes the two of purpose is as follows:
Comprise the following steps:
(1) preparatory stage, one of the purpose rig of technical scheme, drilling rod and drill bit are installed in down-hole drilling position, and use Work stone piles up the first sump and the second sump, and the first sump fills water, adjusts rig location arrangements high pressure water circuit, and by water guide Tail connects be connected fixing with drilling rod;
(2) pressure testing is crept into, and creeps into 1m;
(3) moisture trap is installed, leading portion and the back segment of moisture trap are enclosed within drilling rod, and leading portion is installed to boring In hole, to outside leading portion suit rubber sleeve inflation make rubber sleeve expand with borehole wall fit, the two of back segment holes are adjusted to Arrange one on the other, extraction pipeline is installed at via upward, at via down, connect outlet pipeline, then by leading portion It is connected by ring flange is fixing with back segment;
(4) creep into, open the first water pump successively and rig creeps into, drilling process repeats drilling rod and adds to send and push away Enter, until drillable length meets design requirement;Open the extraction valve on extraction pipeline and the second water on outlet pipeline simultaneously Pump;
(5) hydraulic slotted liner technique, drilling construction is closed the first water pump and the second valve, is carried out according to design slot scheme after completing Move back brill, during moving back brill, when drill bit retreats to required slot position, be again turned on the first water pump and rig, regulate the first water pump Pressure and the second valve, make High-Pressure Water pressure more than hydraulic blow pressure when creeping into, and makes water under high pressure spray from slot nozzle, Along with bit formed high pressure annular water flow to incising coal seam 1-2min, then move back get into next specify position repeat to cut Seam.
Creep into hydraulic slotted liner technique during, when in the second sump, water-coal-slurry amount reaches setting degree, close the second water pump, Appropriate coagulant is added to accelerate the sedimentation velocity of water and coal dust intermixture in the second sump.
Beneficial effect: the present invention is by arranging reamer, boring tooth, slot portion and spool on drill bit, thus provides one Kind of pressure water jets impact make cave orientation, bore tooth creep into, cornish bit reaming, slot portion slot rush-bore-expand-cut integration coal Layer permeability improvement device and utilize this device to carry out the method that coal seam is anti-reflection, thus efficiently avoid deflection of borehole, improve and execute Work environment, decreases the waste of water and gas, improves work efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment one.
Fig. 2 is the structural representation of drill bit.
Fig. 3 is the top view of Fig. 1.
Fig. 4 is the structural representation of moisture trap.
Fig. 5 is the step schematic diagram of embodiment two.
In figure, labelling is as follows: first sump the 1, first valve the 2, first water pump the 3, first Pressure gauge 4, high-pressure water pipe 5, water guide tail meets the 6, second valve 7, drill bit 8, body 81, reamer 82, slot portion 83, bores tooth 84, abrasive grains 85, cornish bit 86, spool 87, back-up ring 88, spring 89, packing ring 810, punching nozzle 811, slot nozzle 812, great circle Post holes 8a, big conical bore 8b, big installing hole 8c, little installing hole 8d, small cylindrical opening 8e, moisture trap 9, leading portion 91, Rubber ring 92, back segment 93, sealing shroud 94, extraction pipeline the 10, the 3rd valve the 11, second Pressure gauge 12, drilling rod 13, brill Machine the 14, second sump the 15, second water pump 16, outlet pipeline 17.
Detailed description of the invention
Embodiments of the invention are described below in detail, and described embodiment example is shown in the drawings, the most from start to finish Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached It is exemplary that figure describes embodiment, it is intended to explains the present invention, and is not considered as limiting the invention.Below in conjunction with attached Figure, by being further described the detailed description of the invention of the present invention, makes technical scheme and beneficial effect thereof more Add clear, clear and definite.
Embodiment one:
As shown in Figure 1, Figure 2 and Figure 3, the present invention includes that rig 14, drilling rod 13 and drill bit 8, described drilling rod 13 are tied in hollow Structure.Described drill bit 8 includes columned body 81, and the front end of described body 81 extends forward and forms coaxial circular cone shape reaming Portion 82, described reamer 82 is pre-small post-large, and on the conical surface of reamer 82, circumference is uniformly fixed with at least two cornish bit 86, institute The quantity stating cornish bit 86 adjusts according to actual needs, cornish bit 86 circumference on preferred described reamer 82 conical surface of the present embodiment It is evenly equipped with three, and the angle that cornish bit 86 is between any two is 120 °.Described cornish bit 86 is diamond blade, each described The top of cornish bit 86 is all in circular arc.The little head end end face of described reamer 82 extends forward at least three that formation circumference is uniform Individual brill tooth 84, the quantity of described brill tooth 84 arranges according to actual needs, does not limits.The present embodiment preferred described brill tooth 84 circumference It is evenly equipped with three, and cornish bit 86 just middle to adjacent brill tooth 84 spacing.The most solid in the front end of each described brill tooth 84 Surely having abrasive grains 85, the quantity of abrasive grains 85 is arranged according to actual needs, does not limits;The present embodiment is preferably in each institute The front end face stating brill tooth 84 is all inlaid with three abrasive grains 85.Described abrasive grains 85 is made up of diamond particles, described brill Tooth 84 is in fan-shaped column.
As shown in Figure 1, Figure 2 and Figure 3, the rear end of described body 81 extends rearwardly to form coaxial cylindric slot portion 83, The radius of radius ratio body 81 cylindrical section in described slot portion 83 is little.Open in described reamer 82, body 81 and slot portion 83 There is the duct passed through for liquid, the front end of the through reamer in front end 82 in described duct, the through slot portion, rear end 83 in duct Rear end.In the front aperture in described duct, punching nozzle 811 is installed, in described slot portion 83, at least one is installed horizontal Slot nozzle 812, all sidewalls in the through slot portion, outer end 83 of described slot nozzle 812, the inner of slot nozzle 812 and duct Connection.The preferred described slot nozzle 812 of the present embodiment is positioned opposite two.Spool 87 it is also equipped with in described duct, when Hydraulic pressure hour, spool 87 is by the inner closing of slot nozzle 812, through before and after described duct;When hydraulic pressure is big, spool 87 is forward Blocking the front portion in duct, slot nozzle 812 the inner connects with rear portion, duct simultaneously.The rear end in described slot portion 83 is solid with drilling rod 13 Determine to be connected, and the rear end in duct connects with drilling rod 13 centre bore.
As shown in Figures 2 and 3, described spool 87 includes coaxial big cylindrical section, middle cylindrical section, roundlet shell of column from back to front And conical head, the radius of described big cylindrical section, middle cylindrical section and roundlet shell of column is sequentially reduced, and described conical head is pre-small post-large, and And the stub end radius of conical head is identical with the radius of roundlet shell of column.Have in described big cylindrical section and middle cylindrical section and mutually pass through Logical via, has the radial direction apopore that at least two circumference is uniform in described roundlet shell of column, the inner of described apopore with The via front end connection of middle cylindrical section.
As shown in Figures 2 and 3, described duct include from back to front big cylindrical hole 8a, big conical bore 8b, big installing hole 8c, Little installing hole 8d and small cylindrical opening 8e, described big cylindrical hole 8a, big installing hole 8c, little installing hole 8d and small cylindrical opening 8e all in The cylindrical hole that body 81 is coaxial and radius is sequentially reduced, described big conical bore 8b is in the circular cone coaxial and pre-small post-large with body 81 Hole.The rear end face in the through slot portion, rear end 83 of described big cylindrical hole 8a, the position of the corresponding big cylindrical hole 8a in slot portion 83 and brill Bar 13 is threaded.The front end face of the through reamer in front end 82 of described small cylindrical opening 8e, described punching nozzle 811 is arranged on hole The front end of road small cylindrical opening 8e.Described big installing hole 8c, between little installing hole 8d and small cylindrical opening 8e all in step transition, and It is fixed with packing ring 810 on step surface in little installing hole 8d.Described big installing hole 8c is positioned at slot portion 83, and described slot sprays The inner of mouth 812 connects with the rear portion of big installing hole 8c, is installed with annular retaining ring 88 in the rear end of described big installing hole 8c, described The big cylindrical section of spool 87 and middle cylindrical section are slidably matched with big installing hole 8c and little installing hole 8d respectively.At the big cylinder of spool 87 Pad between Duan Qianduan and duct big installing hole 8c inner bottom equipped with spring 89, under the effect of spring 89, described spool 87 backward with Back-up ring 88 pushes against, and the big cylindrical section of described spool 87 is by the inner closing of slot nozzle 812.When hydraulic pressure strengthens, and hydraulic pressure overcomes bullet When the elastic force of spring 89 promotes spool 87 to move forward, small cylindrical opening 8e, and taper are stretched in the conical head front end of described spool 87 The conical surface of head pushes against with packing ring 810, and duct closed front, the inner of described slot nozzle 812 connects with big installing hole 8c.
As it is shown in figure 1, described drilling rod 13 away from drill bit 8 one end connect have high pressure water circuit, described high pressure water circuit to include The water guide tail being sequentially connected with by high-pressure water pipe 5 connects the 6, first water pump the 3, first valve 2 and the first sump 1, and it is solid that described water guide tail connects 6 Surely it is connected to drilling rod 13 one end away from drill bit 8, connects at water guide tail and the second valve 7 is installed on 6, on described first water pump 3 First Pressure gauge 4 is installed.
As shown in Figure 1 and Figure 4, described drilling rod 13 is also equipped with gas and water separator, described gas and water separator bag Including the tubulose leading portion 91 and back segment 93 docked by ring flange, described drilling rod 13 passes from the centre bore of moisture trap 9.Institute Stating and be set with rubber sleeve outside leading portion 91, the two ends of rubber sleeve seal and are fixed on leading portion 91, are provided with inflation in the rear end of rubber sleeve Hole.Have two relative vias in the rear in the middle part of section 93, one of them via of back segment 93 is provided with extraction pipeline 10, described extraction pipeline 10 is provided with the 3rd valve 11 and the second Pressure gauge 12.Another via of back segment 93 connects Having outlet pipeline 17, the other end and first sump 1 of described outlet pipeline 17 connect;The rear end connection of section 93 has close in the rear Seal ring 94, described sealing ring 94 is sleeved on drilling rod 13.Described outlet pipeline 17 there also is provided the second sump 15 and second Water pump 16, described second water pump 16 is between the second sump 15 and the first sump 1.
Embodiment two:
As it is shown in figure 5, a kind of coal seam high-pressure water jet rushes-bore-expand-cut integration anti-reflection method, comprise the following steps:
(1) preparatory stage, at down-hole drilling position rigging up, drilling rod and drill bit, and materials clitter build the first sump and Second sump, fills water by the first sump, adjusts rig location arrangements high pressure water circuit, and water guide tail connects connect fixing with drilling rod Connect.
(2) pressure testing is crept into, and creeps into 1m.
(3) moisture trap is installed, leading portion and the back segment of moisture trap are enclosed within drilling rod, and leading portion is installed to boring In hole, to outside leading portion suit rubber sleeve inflation make rubber sleeve expand with borehole wall fit, the two of back segment holes are adjusted to Arrange one on the other.Extraction pipeline is installed at via upward, at via down, connects outlet pipeline, then by leading portion It is connected by ring flange is fixing with back segment.
(4) creep into, open the first water pump successively and rig creeps into, drilling process repeats drilling rod and adds to send and push away Enter, until drillable length meets design requirement.Open the extraction valve on extraction pipeline and the second water on outlet pipeline simultaneously Pump.
(5) hydraulic slotted liner technique, drilling construction is closed the first water pump and the second valve, is carried out according to design slot scheme after completing Move back brill, during moving back brill, when drill bit retreats to required slot position, be again turned on the first water pump and rig, regulate the first water pump Pressure and the second valve, make High-Pressure Water pressure more than hydraulic blow pressure when creeping into, and makes water under high pressure spray from slot nozzle, Along with bit formed high pressure annular water flow to incising coal seam 1-2min, then move back get into next specify position repeat to cut Seam.
Creep into hydraulic slotted liner technique during, when in the second sump, water-coal-slurry amount reaches setting degree, close the second water pump, Appropriate coagulant is added to accelerate the sedimentation velocity of water and coal dust intermixture in the second sump.

Claims (9)

1. coal seam high-pressure water jet rushes-bores-expand-cut an integration permeability improvement device, including rig, drilling rod and drill bit, its feature Being: described drilling rod is hollow structure, described drill bit includes columned body, and it is same that the front end of described body extends forward formation The circular cone shape reamer of axle, described reamer is pre-small post-large, and on the conical surface of reamer, circumference is uniformly fixed with at least two Cornish bit, the little head end end face of described reamer extends forward and forms at least three brill tooth that circumference is uniform, after described body End extends rearwardly to form coaxial cylindric slot portion, and the radius of the radius ratio body cylindrical section in described slot portion is little;Described The duct passed through for liquid is had, the front end of the through reamer in front end in described duct, duct in reamer, body and slot portion The rear end in through slot portion, rear end, in the front aperture in described duct, punching nozzle is installed, is provided with in described slot portion At least one horizontal slot nozzle, all sidewalls in the through slot portion, outer end of described slot nozzle, the inner of slot nozzle with Hole link, is also equipped with spool in described duct, and when hydraulic pressure is little, spool is by the inner closing of slot nozzle, described hole Before and after road through, when hydraulic pressure is big, spool blocks forward the front portion in duct, and slot nozzle the inner connects with rear portion, duct simultaneously; The rear end in described slot portion is fixedly linked with drilling rod, and the rear end in duct connects with drilling rod centre bore.
Coal seam the most according to claim 1 high-pressure water jet rushes-bores-expand-cut integration permeability improvement device, it is characterised in that: Described spool includes coaxial big cylindrical section, middle cylindrical section, roundlet shell of column and conical head from back to front, described big cylindrical section, in The radius of cylindrical section and roundlet shell of column is sequentially reduced, and described conical head is pre-small post-large, and the stub end radius of conical head is with little The radius of cylindrical section is identical, has, in described big cylindrical section and middle cylindrical section, the via being mutually communicated, at described roundlet shell of column Inside having the radial direction apopore that at least two circumference is uniform, the inner of described apopore connects with the via front end of middle cylindrical section;
Described duct includes big cylindrical hole, big conical bore, big installing hole, little installing hole and small cylindrical opening from back to front, described greatly Cylindrical hole, big installing hole, little installing hole and small cylindrical opening all in the cylindrical hole coaxial with body, described big conical bore in body Coaxial and pre-small post-large conical bore, the rear end face in the through slot portion, rear end of described big cylindrical hole, the corresponding big cylinder in slot portion The position in hole is connected with drill rod thread;The front end face of the through reamer in front end of described small cylindrical opening, described punching nozzle is installed Front end at duct small cylindrical opening;Described big installing hole, between little installing hole and small cylindrical opening all in step transition, and little It is fixed with packing ring on step surface in installing hole, and described big mounting hole site is in slot portion, the inner of described slot nozzle Connect with the rear portion of big installing hole, be installed with annular retaining ring in the rear end of described big installing hole, the big cylindrical section of described spool and Middle cylindrical section is slidably matched with big installing hole and little installing hole respectively, at spool big cylindrical section front end and duct big installing hole inner bottom Between pad equipped with spring, under the action of the spring, described spool pushes against with back-up ring backward, and the big cylindrical section of described spool is by slot The inner closing of nozzle;When hydraulic pressure strengthens, when hydraulic pressure overcomes the pressure of spring to promote spool to move forward, the taper of described spool Small cylindrical opening is stretched in head front end, and the conical surface of conical head pushes against with packing ring, duct closed front, the inner of described slot nozzle Connect with big installing hole.
Coal seam the most according to claim 1 and 2 high-pressure water jet rushes-bores-expand-cut integration permeability improvement device, and its feature exists In: described brill tooth rim, to being evenly equipped with three, is respectively and fixedly provided with abrasive grains in the front end of each described brill tooth, described abrasive grains by Diamond particles is constituted, and described brill tooth is in fan-shaped column, and the front end face at each described brill tooth is all inlaid with three abrasive grains.
Coal seam the most according to claim 3 high-pressure water jet rushes-bores-expand-cut integration permeability improvement device, it is characterised in that: Described cornish bit is diamond blade, and the cornish bit circumference on the described reamer conical surface is evenly equipped with three, and cornish bit is the most right The middle of adjacent brill space width, the top of each described cornish bit is all in circular arc.
Coal seam the most according to claim 4 high-pressure water jet rushes-bores-expand-cut integration permeability improvement device, it is characterised in that: Described drilling rod away from drill bit one end connect have high pressure water circuit, described high pressure water circuit to include by leading that high-pressure water pipe is sequentially connected with Water tail connects, the first water pump, the first valve and the first sump, and described water guide tail connects the one end being fixedly connected on drilling rod away from drill bit, Connect at water guide tail and the second valve is installed, described first water pump is provided with the first Pressure gauge.
Coal seam the most according to claim 5 high-pressure water jet rushes-bores-expand-cut integration permeability improvement device, it is characterised in that: Being also equipped with gas and water separator on described drilling rod, described gas and water separator includes the tubulose leading portion docked by ring flange And back segment, described drilling rod passes from the centre bore of moisture trap, is set with rubber sleeve outside described leading portion, the two ends of rubber sleeve Sealing is fixed on leading portion, is provided with air-filled pore in the rear end of rubber sleeve;Two relative vias are had in the rear in the middle part of section, On one of them via of back segment, extraction pipeline is installed, described extraction pipeline is provided with the 3rd valve and the second pressure Table;Another via of back segment connects and has outlet pipeline, the other end of described outlet pipeline and the connection of the first sump;Described The rear end of back segment connects has sealing ring, described seal ring set to be contained on drilling rod.
Coal seam the most according to claim 6 high-pressure water jet rushes-bores-expand-cut integration permeability improvement device, it is characterised in that: There also is provided the second sump and the second water pump on described outlet pipeline, described second water pump is positioned at the second sump and the first sump Between.
8. one kind according to claim 7 coal seam high-pressure water jet rush-bore-expand-cut the coal seam that carries out of integration permeability improvement device High-pressure water jet rushes-bores-expand-cut integration anti-reflection method, it is characterised in that comprise the following steps:
(1) preparatory stage, at down-hole drilling position rigging up, drilling rod and drill bit, and materials clitter builds the first sump and second Sump, fills water by the first sump, adjusts rig location arrangements high pressure water circuit, and water guide tail connects be connected fixing with drilling rod;
(2) pressure testing is crept into, and creeps into 1m;
(3) moisture trap is installed, leading portion and the back segment of moisture trap are enclosed within drilling rod, and leading portion is installed to boring In, make rubber sleeve expand the rubber sleeve inflation of suit outside leading portion and fit with borehole wall, the two of back segment holes are adjusted to one On once arrange, at via upward install extraction pipeline, at via down connect outlet pipeline, then by leading portion with Back segment connects by ring flange is fixing;
(4) creep into, open the first water pump successively and rig creeps into, drilling process repeats drilling rod and adds and send propelling, directly Design requirement is met to drillable length;Open the extraction valve on extraction pipeline and the second water pump on outlet pipeline simultaneously;
(5) hydraulic slotted liner technique, drilling construction is closed the first water pump and the second valve, is moved back according to design slot scheme after completing Bore, during moving back brill, when drill bit retreats to required slot position, be again turned on the first water pump and rig, regulate the first water pump pressure Power and the second valve, make High-Pressure Water pressure more than hydraulic blow pressure when creeping into, and makes water under high pressure spray from slot nozzle, with Bit formed high pressure annular water flow to incising coal seam 1-2min, then move back get into next specify position repeat to cut Seam.
Coal seam the most according to claim 8 high-pressure water jet rushes-bores-expand-cut integration anti-reflection method, it is characterised in that: Creep into hydraulic slotted liner technique during, when in the second sump, water-coal-slurry amount reaches setting degree, close the second water pump, at the second water Appropriate coagulant is added to accelerate the sedimentation velocity of water and coal dust intermixture in storehouse.
CN201610834597.9A 2016-09-18 2016-09-18 Coal seam high-pressure water jet drill, which expands, cuts integrated permeability improvement device and its method CN106320985B (en)

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CN110454214A (en) * 2019-08-31 2019-11-15 贵州大学 A kind of tapping equipment for gas drainage
CN111088993A (en) * 2020-02-11 2020-05-01 山东科技大学 Drilling-cutting-sealing-pressing drilling equipment and method for deep low-permeability high-gas coal seam
CN111088993B (en) * 2020-02-11 2020-12-08 山东科技大学 Drilling-cutting-sealing-pressing drilling equipment and method for deep low-permeability high-gas coal seam

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