CN103061798B - Down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method - Google Patents
Down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method Download PDFInfo
- Publication number
- CN103061798B CN103061798B CN201210583951.7A CN201210583951A CN103061798B CN 103061798 B CN103061798 B CN 103061798B CN 201210583951 A CN201210583951 A CN 201210583951A CN 103061798 B CN103061798 B CN 103061798B
- Authority
- CN
- China
- Prior art keywords
- cave
- hole
- coal
- extraction
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of down-hole concordant long drilled holes consecutive and make cave extraction coal bed gas method and a kind of Hydromechanical drilling reducing reaming bit, this coal seam concordant long drilled holes and make cave technology and combine, transformation hyposmosis coal seam reservoirs permeability, improves the down-hole pumping method of this coal bed drilling extraction production capacity.Enforcement of the present invention is apart from the upwards thick or 1.5m place perforate of 1/3 coal of heading base plate on underground coal mine extraction drill site rib, to construct this coal seam concordant long drilled holes along coal seam, after boring arrives desired depth, move back in drill-through journey utilize Hydromechanical drilling reducing reaming bit to boring make cave from inside to outside successively, cave diameter, cave spacing can by formulae discovery.After cave completes, stress of coal seam around cave is discharged, coal seam primary fracture is widened, is lengthened, and in the process of stress redistribution, tensile and shear failure occur in coal seam, produce new crack, thus coal seam fracture connectivity is increased, permeability improves, and coal bed gas can obtain very fast depressurization desorption, increase substantially the extraction efficiency of coal bed gas, shorten the coal bed gas extraction time.
Description
Technical field
The invention belongs to extraction coal bed gas method, specifically a kind of down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method.
Technical background
Down-hole drilling extraction coal bed gas is one of control of coalmine gas and the major measure eliminating coal and gas prominent, reduces coal seam gas-bearing capacity by extraction, reduces tunnel and digs well and gas emission during stope back production, reduce the danger of coal and gas prominent.The method of underground coal mine coal-bed gas extract, mainly by increasing drill hole density, reduces the spacing of wells, as adopted intensive boring; Or change coal bed drilling arrangement, as changed cross borehole into by horizontal bore; Or increase extraction bore diameter; Or the method increasing drilling-draining negative pressure improves coal bed drilling gas drainage amount, its shortcoming is the increase in the construction volume of boring and drill footage amount and duration and expense.Find in practice, because coal seam permeability is poor, crack agensis, directly carries out hole pumping and mining in down-hole, and because boring aperture is less, influence basin is limited, and the speed of gas Spontaneous release and output results are all poor, and extracting result sometimes and not obvious.So those skilled in the art have developed again the technology in Zhong Zao cave, coal seam, amassing by making cave expansion uncovering coal plane, increasing cracks in coal seam, thus coal bed gas spill-out is increased." Coalbed Methane In China " in July, 2007, " coal bed gas makes the practice and understanding of cave technology " literary composition describes in detail and how to utilize gases at high pressure to make cave.
Hole Cave technology is mainly used in ground straight well extraction, and when extraction boring in ground arrives pre-extraction coal seam, in pre-extraction coal seam, section manufactures Hole Cave artificially.As publication zl201010102300.2 and zl200610047360.2.The common method now making cave has that negative pressure makes cave, hydraulic jet makes cave, machine tool makes cave and hydraulic jet+mechanical type makes cave technology.Hole Cave technology can make coal seam be communicated with to greatest extent with well, removes the pollution of near wellbore zone, increases the effective diameter of well.But this technology only manufactures single cave for straight well coal seam, ground section, the influence basin in cave is limited, and is subject to the factors restrictions such as coal seam thickness, and the diameter making cave also can not infinitely expand, well can not play cave change coal seam permeability poor, the obsolete present situation in crack.
Summary of the invention
The present invention is to overcome that concordant long drilled holes aperture, existing coal seam is little, influence basin is little and the deficiency such as extraction efficiency is low, providing a kind of down-hole concordant long drilled holes consecutive and make cave extraction coal bed gas method.
Technical scheme of the present invention is as follows, a kind of down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method, underground coal mine drill site is constructed this coal seam concordant long drilled holes, after boring reaches desired depth, from inside to outside cave is made successively to borehole wall moving back in drill-through journey, make cave original position and be positioned at foot of hole, last is made acupuncture point and is set to apart from aperture 15m, after drilling construction completes, in boring, coal bed gas extraction pipeline is installed at inner outlet place, sealing of hole, sealed borehole length is 5 ~ 8m, and drilling-draining pipeline is connected with down-hole drainage system, the coal bed gas of down-hole draw-off pump station to this extraction boring influence area is utilized to implement extraction.
Boring position of opening apart from seat earth upwards (1/3 ~ 1/2) coal thick place perforate, cave diameter D be coal seam thickness 1/4-1/6 between or to determine according to coal petrography mechanics parameter, the distance made between cave is 5-10 cave diameter doubly,
Advantage of the present invention: (1) the invention provides a kind of by construction this coal seam concordant long drilled holes carry out the technology that cave is made at interval along drilling axis, the all gas storage regions in this coal seam can be made all to obtain making the impact in cave by making cave continuously, thus improve coal bed drilling single hole extraction production capacity, expand hole pumping and mining scope, transformation low permeability coal seam permeability, improves down-hole coal bed gas extraction efficiency.
(2) present invention achieves this concordant long drilled holes small-bore, coal seam and make cave technology and organically combine, drilling and forming hole can be realized and move back brill and make cave and once complete, avoid collapse hole of holing, enter the construction difficult problem of difficulty again, and in the process of moving back brill, manufacture the cave of the multiple moniliform distributions along drilling axis distribution, change certain limit internal stress distribution around drilling axis radial direction and cave, break the natural stress system of coal seam reservoirs, stress of coal seam around cave is discharged, in the process of stress redistribution, drill hole wall and cave wall form shear stress and concentrate, stress plasticity relaxation zone is formed in country rock, there is tensile and shear failure in coal seam in the process, produce new crack, form the interference between cave, cause in coal seam be in closed, communicate with each other in the crack, coal seam of semi-closed state, form large area air infiltration circulation road, thus improve the permeability in coal seam.
(3) this advantage that coal seam concordant long drilled holes slim-hole drilling length is long and hole wall coal seam, cave exposed area is large is taken full advantage of.Cavern location, cave spacing and cave diameter are selected rationally, stress between cave can be made both to superpose, interact again, increase that single hole uncovering coal plane is long-pending, external crack opening degree and plasticity influence area, cave scope, to realize between cave almost non-blind area, thus transform the permeability in coal seam.Small-bore creeps into that length is long, expense is low, difficulty of construction is low.Cave is made in boring, adds single hole uncovering coal plane and amasss.Making cave completes in later a period of time, reservoir rock mass produces the uneven movement (sedimentation, sidesway and break) to cave under geostatic stress effect, thus unload except partly stress, stress relaxation zone is formed in the country rock of cave, initial fissure in reservoir rock mass is opened, width, length and the degree of depth that crack is opened all increase, and improve the permeability of reservoir; The simultaneously inhomogeneous deformation of cave country rock and destruction, produce under the effect of transverse stretching power and break, form regeneration crack, especially the agensis layer position, crack in reservoir (as coal seam folder liver, dull coal band) and the crack of cranny development layer position is made to obtain through, cracks in coal seam is communicated with the permeability further improving reservoir, forms the assembling area being easy to fluid flowing, improve the coefficient of mining of coal bed gas around cave, shorten the extraction time simultaneously, improve extraction efficiency.
(4) increase the spacing of wells, unit volume coal seam, reduce drill footage, totally decrease boring workload.The intensive boring of the many employings of this coal seam extraction now, stope adopts parallel hole or radioactivity boring, and as 6m coal high seam, parallel hole adopts ordi-nary drilling machine spacing of wells 1.5m ~ 3m, and aperture is greater than φ 100mm, the general 200 ~ 300m of drilling depth.Radioactivity boring adopts stub boring hole (being less than 300m) or long drilled holes (being generally less than 1000m), within radioactivity hole keeps whole pitch of holes 8m (according to extraction time length adjustable).After using concordant long drilled holes consecutive to make cave extraction fire damp technology, the spacing of wells can increase to 5 ~ 10m, drillable length at least can reach 800 ~ 1000m, article 1, Gas pre-drainage tunnel can at least carry out taking out in advance in advance to 2 stope width, boring workload at least reduces 1/2, reduce the driving that 1 is taken out tunnel in advance, reduce by 1/2 removal of home simultaneously and correct hole bit time.
(5) the present invention holes on the basis of original drilling tool using function not affecting, rational modification has been carried out to drilling tool, achieve a kind of mechanical hydraulic-pressure type drill-following reaming bit, mechanical hole reaming is realized with brill, to realize in complete hard coal seam horizontal drilling pore-forming and move back brill and make cave and once complete.
The technical scheme of this drilling tool is, a kind of Hydromechanical drilling reducing reaming bit, comprises top connection, housing, core barrel, axle, drill bit, piston system, drilling fluid flow control system, enlarging while drilling gear wheel arm assembly.Described housing comprises the upper shell, middle shell, the lower house that connect successively, top connection connects upper shell, upper shell and middle shell center arrangement core barrel, axle is worn in middle shell and lower house, axle lower end connects drill bit, have big spring at mandrel outer cover, big spring is stuck between lower house and axle.Piston system comprises piston, plunger shaft and plunger shaft connecting hole.Drilling liquid flow, is realized by tube connector and associated component thereof to set-up of control system between core barrel and axle.Tube connector one end is pressure cap, and the other end is water inlet, and outer wall is provided with annular little spring, tube connector this as sidewall and one end open, the other end close hollow cylinder component, its effect be exactly control core barrel and axle inner chamber drilling liquid flow to.Be provided with the piston of annular in the cavity formed in upper shell and middle shell, piston upper surface is long-pending is greater than following table area.The profile of tooth bar that enlarging while drilling gear wheel arm assembly comprises piston system and is connected with piston side, the gear outside middle shell, gear and the engagement of profile of tooth bar, gear is connected with gear wheel arm, and middle shell is provided with oblique nozzle.
Drill-following reaming bit structure design described in the present invention is simple, processing and manufacturing is easy to realize, the connector of different size is coordinated to can be used for rotary drill and hydro powered screw motor rig, can avoid collapse hole of holing, drilling tool is difficult to the construction difficult problem entering boring again, and improves reaming efficiency simultaneously, expand borehole size, increase well rib exposed area, cost is low, reduces and creeps into workload and boring expense.
Accompanying drawing illustrates:
Fig. 1 down-hole of the present invention concordant long drilled holes consecutive makes the single borehole sections structural representation in cave
Fig. 2 down-hole concordant long drilled holes makes the single boring in cave
place's schematic cross-section
Fig. 3 down-hole concordant long drilled holes is made extraction panel, cave horizontal bore and is arranged schematic diagram
Fig. 4 down-hole concordant long drilled holes is made the boring of cave extraction stope radioactivity and is arranged schematic diagram
Fig. 5 Hydromechanical drilling reducing reaming bit vertical section schematic diagram
Fig. 6 is the A-A generalized section in Fig. 5
Fig. 7 is the B-B schematic cross section in Fig. 5
In figure: 1-coal bed gas extraction long drilled holes, 2-cave plasticity affects border d, 3-gas drainage pipe, 4-gas sealing of hole position, 5-cave, 6-roof, 7-gas drainage under suction tunnel, 8-seat earth, 9-coal seam, 10-drill site, 11-top connection, 12-upper shell, 13-core barrel, 14-middle shell, 15-lower house, 16-axle projection, 17-big spring, 18-axle, 19-drill bit, 20-plunger shaft, 21-piston, 22-T shape sealing ring, 23-cavity, 24-connector, 25-pressure cap, 26-packing ring, 27-little spring, 28-tube connector, 28-1 side-wall hole, 29-water inlet, 30-O shape sealing ring, 31-plunger shaft connecting hole, 32-profile of tooth bar, 33-spring, 34-semicircular cavities, 35-nozzle connecting hole, 36-plunger shaft connecting hole, 37-bearing, 38-nozzle, 39-locating piece, 40-support bar, 41-bearing, 42-gear, 43-gear wheel arm, 44-sliding tray, 45-roller bearing.
Detailed description of the invention
A kind of down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method, underground coal mine drill site is constructed this coal seam concordant long drilled holes, after boring reaches desired depth, Hydromechanical drilling reducing reaming bit is utilized to make cave from inside to outside successively to borehole wall moving back in drill-through journey, make cave original position and be positioned at foot of hole, last is made acupuncture point and is set to apart from aperture 15m, after drilling construction completes, in boring, coal bed gas extraction pipeline is installed at inner outlet place, sealing of hole, sealed borehole length is 5 ~ 8m, and drilling-draining pipeline is connected with down-hole drainage system, utilize down-hole draw-off pump station to extraction under the coal bed gas well of this extraction boring influence area.
Boring position of opening apart from seat earth upwards (1/3 ~ 1/2) coal thick place perforate, cave diameter D be coal seam thickness 1/4-1/6 between or to determine according to coal petrography mechanics parameter, the distance made between cave is 5-10 cave diameter doubly.
Be described further below in conjunction with accompanying drawing.
Make in practical operation cave diameter can be similar to by
value, in formula:
for cave diameter,
for coal seam thickness; (2) when there being coal petrography mechanics parameter, cave diameter
can by formulae discovery:
In formula: M-be coal seam thickness;
-initial field stress, can press
,
for taking out the average severe of coal seam covering layer in advance, H is overburden cover;
for the cohesion in coal seam;
for the angle of internal friction in coal seam.Cave interval S and spacing of wells m determine by plasticity circle of influence border, cave d.According to rock mechanics, buriedly equidistantly isometrically place side by side infinite many caves, due to Stress superposition between cave and interaction, cave spacing
time, mutually without impact between cave.Thus, cave spacing is approximate presses
value, in formula:
for cave diameter,
for cave center distance.Spacing of wells m calculates by the arrangement mode between cave spacing and adjacent boring cave and determines.After drilling construction completes, in boring, coal bed gas extraction pipeline is installed at inner outlet place, sealing of hole, and sealed borehole length is 5 ~ 8m, and drilling-draining pipeline is connected with down-hole drainage system, utilizes the coal bed gas of down-hole draw-off pump station to this extraction boring influence area to implement extraction.
Embodiment 1: driving face concordant long drilled holes consecutive makes cave pre-extraction coal-bed gas method.See figures.1.and.2 and illustrated.Shanxi, somewhere group takes out coal seam thickness M=6000mm in advance, takes out tunnel length 800m in advance, and coal petrography mechanics parameter is not quite clear, by formula
, known cave diameter is between φ 1200mm, and cave spacing is by formula
estimation cave spacing is
between 6 ~ 12m, now get S=10m.Taking out in the middle part of coal bed gas drainage digging laneway (7) work plane in advance, adopting km rig to creep into extraction long drilled holes (1) in pre-digging laneway direction, long drilled holes diameter phi 96mm.After boring reaches desired depth, Hydromechanical drilling reducing reaming bit can be applied, reaming gear wheel arm is opened by hydraulic-driven, cave is made at foot of hole, after completing first cave (5), shrink reaming gear wheel arm, move back brill, after retreating 10m, again reaming gear wheel arm is opened by hydraulic-driven, carry out making cave, after completing second cave (5) thus, shrink reaming gear wheel arm, move back brill, the like, according to the cave spacing of design, make cave successively from the inside to surface, until complete last cave (5) apart from 15m place, aperture, gas drainage pipe (3) is laid in aperture, sealing of hole is carried out to gas sealing of hole position (4), sealed borehole length is 5 ~ 8m, and gas drainage pipe (3) is connected with down-hole drainage system, complete the construction of a concordant long drilled holes cave extraction boring.
Embodiment 2: gas drainage under suction tunnel, panel adopts parallel long drilling hole in coal seam consecutive to make cave pre-extraction coal-bed gas method, with reference to situation illustrated in Figure 3, Shanxi, somewhere group takes out coal seam thickness M=6000mm in advance, takes out lid mountain, panel average thickness 460m in advance, the average severe 25kN/m of rock mass
3, the cohesion in coal seam
for the angle of internal friction in 0.4MPa, coal seam
it is 25 °, by formula
, cave size can be obtained and be about φ 1400mm.The size making cave is calculated, by formula in addition according to taking out coal seam thickness M in advance
, known cave size is between φ 1200mm, considers, and getting cave diameter is φ 1300mm.Cave spacing is by formula
, then cave spacing is
between 6.5 ~ 13m, now adopt S=10m spacing, according to the triangle cloth hole, adjacent cave of adjacent boring, then spacing of wells m presses formulae discovery
, be about 8.7m, get spacing of wells 9m construction.Thus, adopt km rig to form long drilled holes, adopt rig to creep into extraction boring (1) by drilling design track, long drilled holes diameter phi 96mm in coal bed gas drainage tunnel (7).After boring reaches desired depth, move back brill, reaming gear wheel arm is opened by hydraulic-driven, cave is made at foot of hole, after completing first cave (5), shrink reaming gear wheel arm, move back brill, after retreating 9m, again reaming gear wheel arm is opened by hydraulic-driven, carry out making cave, after completing second cave (5) thus, shrink reaming gear wheel arm, move back brill, the like, put according to the acupuncture point of making of design, successively cave is made from the inside to surface to coal seam, until complete last cave (5) apart from aperture 15m, gas drainage pipe (3) is laid in aperture, sealing of hole is carried out to gas sealing of hole position, aperture (4), sealed borehole length is 5 ~ 8m, and gas drainage pipe (3) is connected with down-hole drainage system, complete the construction of a concordant long drilled holes cave extraction boring.And first 9m place, interval that holes, according to the method for first firedamp taking-out discharging drilling, completes the construction of second concordant long drilled holes cave extraction boring by the triangle pattern in cave.Circulation like this, complete all boring successively, until complete pre-extraction stope all drilled hole and make cavities hole, and lay gas drainage pipe (3) at each drilling orifice that completed, sealing of hole is carried out to gas sealing of hole position, aperture (4), and gas drainage pipe (3) is connected with down-hole drainage system, utilize the coal bed gas of down-hole draw-off pump station to this extraction boring influence area to implement extraction.
Embodiment 3: stope radioactivity makes the pre-extraction coal-bed gas in cave along coal bed drilling consecutive.With reference to figure 4, adopt radioactivity to make cave pre-extraction coal-bed gas system along coal bed drilling to coal-face, make acupuncture point put and extraction bore angle and spacing according to draw out methane single hole coal seam cave size and boring of coal seam (9) thickness M, the design of cave, coal seam maximum effect scope.Then rig is adopted to creep into extraction boring (1) by drilling design track in coal bed gas drainage tunnel (7), after boring reaches desired depth, move back brill, put by the acupuncture point of making of design, successively cave is made from the inside to surface to coal seam, make after cave completes, gas drainage pipe (3) is laid in aperture, sealing of hole is carried out to gas sealing of hole position, aperture (4), and gas drainage pipe (3) is connected with down-hole drainage system, circulation like this, to construct successively all boring, and at design attitude, cave is made to boring, until complete pre-extraction stope all drilled hole and make cavities hole, and lay gas drainage pipe (3) at each drilling orifice that completed, sealing of hole is carried out to gas sealing of hole position, aperture (4), and gas drainage pipe (3) is connected with down-hole drainage system, utilize down-hole draw-off pump station to extraction under the coal bed gas well of this extraction boring influence area.
The operating principle of Hydromechanical drilling reducing reaming bit, is described the operating principle of Hydromechanical drilling reducing reaming bit below in conjunction with Fig. 5, Fig. 6 and Fig. 7:
As shown in Figure 5, top connection 11, housing, core barrel, axle 18, drill bit 19, piston system, drilling fluid flow control system, enlarging while drilling gear wheel arm assembly is comprised.Described housing comprises the upper shell 12, middle shell 14, the lower house 15 that connect successively, top connection 11 connects upper shell 12, upper shell 12 and middle shell 14 center arrangement core barrel 13, core barrel 13 lower end sidewall is provided with connector 24, axle 18 is worn in middle shell 14 and lower house 15, axle 18 lower end connects drill bit 19, and outside axle 18, cover has big spring 17, and big spring 17 is stuck between lower house 15 and axle 18.Piston system comprises piston 21, plunger shaft 20 and plunger shaft connecting hole 31 and 36.Drilling liquid flow to set-up of control system between core barrel 13 and axle 18, drilling fluid flow control system comprises tube connector 28, tube connector 28 one end is pressure cap 25, the other end is water inlet 29, outer wall is provided with annular little spring 27, tube connector 28 sidewall was liquid elongated hole, and tube connector 28 upper end pressure cap 25 is positioned at core barrel 13 bottom, and tube connector 28 lower end is communicated with axle 18; Be provided with the piston 21 of annular in the cavity formed in upper shell 12 and middle shell 14, piston 21 top surface area is greater than following table area.The profile of tooth bar 32 that enlarging while drilling gear wheel arm assembly comprises piston system and is connected with piston 21 side, the gear 42 outside middle shell 14, gear 42 and profile of tooth bar 32 engage, and gear 42 is connected with gear wheel arm 43, and middle shell 14 is provided with oblique nozzle 38.
Drilling liquid flow, is realized by tube connector 28 and associated component thereof to set-up of control system between core barrel 13 and axle 18.Tube connector 28 as one end open, close by the other end, the hollow cylinder component of sidewall also opening, its effect be exactly control core barrel 13 and axle 18 inner chamber drilling liquid flow to.Connector 24 is provided with filter screen, and filter screen can filter the impurity in drilling fluid, prevents piston wear.Unidirectional nozzle can prevent the drilling fluid of shell outer wall from flowing into cavity 23.
Its course of work is, when in the normal drilling process forward of drill bit, drill bit 19 is subject to the pressure on top surface creeping into rock mass, promotion axle 18 extrudes big spring 17 and little spring 27 bounces back backward, the inner chamber of tube connector 28 centripetal canals 13 between axle 18 and core barrel 13 moves, connector 24 between core barrel 13 and housing 14 is closed by axle inwall, tube connector 28 extend in core barrel 13, core barrel 13 and the conducting of axle 18 inner chamber, drilling fluid is by core barrel 13 inner chamber, the inner chamber of axle 18 is entered by the through hole of tube connector 28 sidewall, flowed out by the nozzle before drill bit 19, drill bit creeps into forward, creep into neck eye, now gear wheel arm is in closure state all the time.
After creeping into certain depth, carry out according to schedule moving back brill ream operation, get into certain position creep into forward expansion at the moment when moving back, drill bit 19 dead ahead has formed neck eye, drill bit 19 is no longer pressed by the top of creeping into rock mass, and big spring 17 and little spring 27 jointly promote axle 18 and move forward, and the tube connector 28 between core barrel 13 and axle 18 enters axle 18 inner chamber, tube connector 28 passage closes, and the connector 24 of core barrel 13 sidewall is opened, then hydraulic pressure is increased, drilling fluid enters cavity 23 between core barrel 13 and housing 14, part drilling fluid enters in plunger shaft 20 through plunger shaft connecting hole 36 and 31, due to piston 21 sectional area up and down not etc., piston moves to drill bit direction under hydraulic drive, piston 21 drives profile of tooth bar 32 to move forward, profile of tooth bar 32 driven gear 42 rotates, gear 42 drives gear wheel arm 43 to expand outwardly, realize reaming, when after gear wheel arm opened with certain angle, then push ahead in process at drilling rod middle shell 14, borehole wall provides an outside tension force to gear wheel arm 43 simultaneously, gear wheel arm 43 opening angle continuous enlargement, until maximum extension diameter.Another part drilling fluid is sprayed by nozzle connecting hole 35 built-in pipe and oblique nozzle 38 in middle shell 14, realizes the cooling to gear wheel arm 43 reaming hole process and wash boring.
Load transfer in the above-mentioned course of work: creep into neck at the moment, is connected with top drilling tool by top connection 11, and the pressure of the drill reaches drill bit 19 through upper shell 12, housing 14, lower casing 15, axle 18; Creep into end move back bore expand cave time, the pressure of the drill reaches gear wheel arm 43 through upper shell 12, housing 14.Moment of torsion transmission in the above-mentioned course of work: creep into neck at the moment, is connected with top drilling tool by top connection 11, and the pressure of the drill through upper shell 12, housing 14, reach axle 18 by projection 16, then reaches drill bit 19 by axle 18; Creep into expansion at the moment, through upper shell 12, housing 14, housing 14 realizes reaming hole by drive gear wheel arm 43.When gear wheel arm open reach maximum angle time, under the acting in conjunction of locating piece 39 and support bar 40, locking gear wheel arm, support bar 40 can increase the rigidity of gear wheel arm simultaneously.
Make cave complete, when brill is moved back in preparation, drilling fluid pressure release, liquid in plunger shaft is flowed out through connecting hole 31,36 by plunger shaft 20, piston promotes piston 21 moves under the effect of spring 33, piston 21 drives on profile of tooth bar 32 and moves, and profile of tooth bar 32 is by driving gear wheel arm 43 inwardly retracted for clearance with the gear 42 at gear wheel arm assembly rear portion.Simultaneously in the process of moving back brill, the neck eyelet of the non-reaming at boring rear portion also realizes retracted for clearance by extruding support bar 40 and gear wheel arm 43.
Creep into and lead at the moment drilling liquid flow flowing mode to be: drilling fluid is shown in Fig. 7 by core barrel 13 by the side-wall hole 28-1(of tube connector 28), enter the inner chamber of axle 18 through axle 18 water inlet 29, flowed out by the nozzle before drill bit 19.
When moving back brill, drilling liquid flow flowing mode is: drilling fluid enters cavity 23 between core barrel 13 and housing 14 by core barrel 13 by connector 24, and a part of drilling fluid enters in plunger shaft 20 by plunger shaft connecting hole 31 and 36; Another part drilling fluid is sprayed by the pre-buried nozzle of nozzle connecting hole 35 in the oblique nozzle 38 and gear wheel arm of shell 14 outer wall, realizes the cooling to gear wheel arm 43 reaming hole process and wash boring.
Claims (3)
1. a down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method, it is characterized in that: underground coal mine drill site is apart from 1/3 ~ 1/2 coal thick place perforate of seat earth, to construct this coal seam concordant long drilled holes, after boring reaches desired depth, from inside to outside cave is made successively to borehole wall moving back in drill-through journey, make cave original position and be positioned at foot of hole, after drilling construction completes, in boring, coal bed gas extraction pipeline is installed at inner outlet place, sealing of hole, sealed borehole length is 5 ~ 8m, and drilling-draining pipeline is connected with down-hole drainage system, utilize down-hole draw-off pump station to extraction under the coal bed gas well of this extraction boring influence area,
The step making cave is, after boring reaches desired depth, application Hydromechanical drilling reducing reaming bit, reaming gear wheel arm is opened by hydraulic-driven, cave is made at foot of hole, after completing first cave (5), shrink reaming gear wheel arm, move back brill, after retreating 10m, again reaming gear wheel arm is opened by hydraulic-driven, carry out making cave, after completing second cave (5) thus, shrink reaming gear wheel arm, move back brill, the like, according to the cave spacing of design, make cave successively from the inside to surface, until complete last cave (5) apart from 15m place, aperture, gas drainage pipe (3) is laid in aperture, sealing of hole is carried out to gas sealing of hole position (4), sealed borehole length is 5 ~ 8m, and gas drainage pipe (3) is connected with down-hole drainage system, complete the construction of a concordant long drilled holes cave extraction boring,
Wherein making cave original position is foot of hole, and last is made acupuncture point and is set to apart from aperture 15m, and cave spacing is pressed
value, cave diameter D chooses by following method: (1), when without coal petrography mechanics parameter, cave diameter is pressed
value, in formula:
for cave diameter,
for coal seam thickness; (2) when there being coal petrography mechanics parameter, cave diameter
by formulae discovery:
In formula: M is coal seam thickness;
-initial field stress, presses
,
for taking out the average severe in covering layer rock stratum, coal seam in advance, H is overburden cover;
for coal seam cohesion,
for the angle of internal friction in coal seam.
2.
according to claim 1a kind of down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method, it is characterized in that: Hydromechanical drilling reducing reaming bit comprises top connection (11), housing, core barrel, axle (18), drill bit (19), piston system, drilling fluid flow control system, enlarging while drilling gear wheel arm assembly; Described housing comprises the upper shell (12), middle shell (14), the lower house (15) that connect successively, top connection (11) connects upper shell (12), upper shell (12) and middle shell (14) center arrangement core barrel (13), axle (18) is worn in middle shell (14) and lower house (15), axle (18) lower end connects drill bit (19), in axle (18) outside, cover has big spring (17), and big spring (17) is stuck between lower house (15) and axle (18); Piston system comprises piston (21), plunger shaft (20) and plunger shaft connecting hole (31,36); Drilling liquid flow to set-up of control system between core barrel (13) and axle (18), drilling fluid flow control system comprises tube connector (28), tube connector (28) one end is pressure cap (25), the other end is water inlet (29), outer wall is provided with annular little spring (27), tube connector (28) sidewall was liquid elongated hole, and tube connector (28) upper end pressure cap (25) is positioned at core barrel (13) bottom, and tube connector (28) lower end is communicated with axle (18); Be provided with annular piston (21) in upper shell (12) and the middle cavity formed of middle shell (14), piston (21) top surface area is greater than following table area.
3.
according to claim 2a kind of down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method, it is characterized in that: the profile of tooth bar (32) that enlarging while drilling gear wheel arm assembly comprises piston system and is connected with piston (21) side, the gear (42) in middle shell (14) outside, gear (42) and profile of tooth bar (32) engagement, gear (42) is connected with gear wheel arm (43), and middle shell (14) is provided with oblique nozzle (38).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210583951.7A CN103061798B (en) | 2012-12-30 | 2012-12-30 | Down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210583951.7A CN103061798B (en) | 2012-12-30 | 2012-12-30 | Down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103061798A CN103061798A (en) | 2013-04-24 |
| CN103061798B true CN103061798B (en) | 2016-04-27 |
Family
ID=48104651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210583951.7A Active CN103061798B (en) | 2012-12-30 | 2012-12-30 | Down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103061798B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075148B (en) * | 2013-02-19 | 2015-07-29 | 中国矿业大学 | On to the method for remotely drilling Fast Measurement coal-bed gas pressure and device thereof |
| CN104847260B (en) * | 2015-05-21 | 2017-03-01 | 中煤科工集团重庆研究院有限公司 | Underground coal mine reverse reaming permeability improvement device and using method |
| CN106089289B (en) * | 2016-06-08 | 2018-12-21 | 中国矿业大学 | Alternately protected type stope concordant drilling hydraulic flushing in hole makes cave construction method |
| CN106285477B (en) * | 2016-08-30 | 2018-06-19 | 中煤科工集团西安研究院有限公司 | Underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method |
| CN108798630B (en) * | 2018-04-28 | 2021-09-28 | 中国矿业大学 | Cave pressure relief mining simulation test system for tectonic coal in-situ coal bed gas horizontal well |
| CN109083637B (en) * | 2018-08-28 | 2021-07-23 | 中国矿业大学 | Device and method for measuring hole diameter of underground coal seam hydraulic punching hole making |
| CN111577142B (en) * | 2020-04-30 | 2021-04-02 | 中国矿业大学 | Hydraulic hole expanding drilling tool for permeability increase of mechanical cave coal seam and hole expanding method thereof |
| CN111764871A (en) * | 2020-07-08 | 2020-10-13 | 广州海洋地质调查局 | Natural gas hydrate reservoir direct-increasing horizontal mining method |
| CN112211595B (en) * | 2020-10-20 | 2022-05-06 | 吕梁学院 | Construction method of coal-bed gas well at critical position |
| CN113062763B (en) * | 2021-05-07 | 2022-05-20 | 重庆工程职业技术学院 | Gas extraction device and method for preventing coal and gas outburst |
| CN113846971B (en) * | 2021-09-29 | 2024-03-29 | 河南能源化工集团研究总院有限公司 | Mechanical hydraulic drilling and hole-making integrated device and operation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU945353A1 (en) * | 1980-03-26 | 1982-07-23 | Научно-производственное объединение по термическим методам добычи нефти | Expander |
| CN101225736A (en) * | 2008-02-01 | 2008-07-23 | 西南石油大学 | Hydraulic double-acting drilling reamer |
| CN101377124A (en) * | 2007-08-29 | 2009-03-04 | 王建生 | Horizontal bare hole flow guiding slot well and method for mining coal bed gas of sugarcoated haw well |
| CN201567961U (en) * | 2009-12-16 | 2010-09-01 | 中国石油天然气股份有限公司 | Hydraulic variable hole expander while drilling |
| CN102493833A (en) * | 2011-11-25 | 2012-06-13 | 重庆市能源投资集团科技有限责任公司 | Depressurized extraction method for cutting through roof or floor of coal seam by abrasive water jet |
| CN203008787U (en) * | 2012-12-30 | 2013-06-19 | 中北大学 | Hydraulic mechanical reamer bit with variable diameters in drilling |
-
2012
- 2012-12-30 CN CN201210583951.7A patent/CN103061798B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU945353A1 (en) * | 1980-03-26 | 1982-07-23 | Научно-производственное объединение по термическим методам добычи нефти | Expander |
| CN101377124A (en) * | 2007-08-29 | 2009-03-04 | 王建生 | Horizontal bare hole flow guiding slot well and method for mining coal bed gas of sugarcoated haw well |
| CN101225736A (en) * | 2008-02-01 | 2008-07-23 | 西南石油大学 | Hydraulic double-acting drilling reamer |
| CN201567961U (en) * | 2009-12-16 | 2010-09-01 | 中国石油天然气股份有限公司 | Hydraulic variable hole expander while drilling |
| CN102493833A (en) * | 2011-11-25 | 2012-06-13 | 重庆市能源投资集团科技有限责任公司 | Depressurized extraction method for cutting through roof or floor of coal seam by abrasive water jet |
| CN203008787U (en) * | 2012-12-30 | 2013-06-19 | 中北大学 | Hydraulic mechanical reamer bit with variable diameters in drilling |
Non-Patent Citations (2)
| Title |
|---|
| 大孔径顺层长钻孔消突技术在潘一矿的应用;童碧，等;《煤炭科学技术》;20110930;第39卷(第9期);第30-33页 * |
| 煤层气井造穴技术的实践与研究;莫日和;《中国煤层气》;20070731;第4卷(第3期);第35-37、42页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103061798A (en) | 2013-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103061798B (en) | Down-hole concordant long drilled holes consecutive makes cave extraction coal bed gas method | |
| CN105156085B (en) | The coal mine underground coal bed tree-shaped uniform anti-reflection method of drilling composite fracturing | |
| CN105971663B (en) | A kind of the drilling arrangement and anti-reflection method of coal seam high-pressure hydraulic slot pressure break | |
| WO2018099262A1 (en) | Rock drilling, swelling and chiselling combined machine based on high-pressure foam medium | |
| CN108757000A (en) | A kind of quick slot orientation fracturing system in underground based on drilling machine power and method | |
| CN102094668B (en) | High-pressure hydraulic tunneling, pressure releasing and protrusion removing method for upper drainage roadway | |
| CN105422069A (en) | Drilling, punching and cutting coupled pressure-relief permeability-increase method of high-gas-outburst coal seam | |
| CN106437570A (en) | Drilling type continuous sand blasting device | |
| CN203905824U (en) | Rotary self-propelled type multi-hole jet drill bit for radial side tracking | |
| CN103046871B (en) | Hydra-mechanical reducing bit broaching while drilling | |
| CN203008787U (en) | Hydraulic mechanical reamer bit with variable diameters in drilling | |
| CN113338802B (en) | Fluidized hydraulic coal mining system for ground directional drilling | |
| CN111441817B (en) | Method for reinforcing gas extraction by synergistic effect of coal seam drilling jet fracturing and mining pressure | |
| CN110306934A (en) | The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes | |
| CN109356524A (en) | A kind of static, pushing type hydraulic rotating guide drilling tool | |
| CN107288540B (en) | A kind of oil/gas drilling volume increase connection makees device and method | |
| CN109025940B (en) | CO for tight oil reservoir2Fracturing oil displacement integrated oil extraction method | |
| CN102434192A (en) | Device and method for enhancing coal seam fracturing effect | |
| CN108301769A (en) | A kind of RW types horizontal well construction method and its drilling tool used | |
| CN102926797B (en) | Drilling, dust discharging and permeability-increasing integrated device for high gas pressure, high geostress and high crushing (three-high) area of coal mine | |
| CN209369725U (en) | A kind of static, pushing type hydraulic rotating guide drilling tool | |
| CN104763348A (en) | Embedded bionic nozzle type drilling and expanding integral drilling tool and drilling and hole expandin method thereof | |
| CN104563873A (en) | Downhole casing power guide device | |
| CN106978973A (en) | Portable anti-axial impact drilling system | |
| CN212803060U (en) | Radial grooving device in drilling hole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |