CN109812253A - A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio - Google Patents
A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio Download PDFInfo
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- 230000001186 cumulative effect Effects 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 title claims abstract description 19
- 239000002360 explosive Substances 0.000 claims abstract description 32
- 230000037452 priming Effects 0.000 claims abstract description 16
- 238000005474 detonation Methods 0.000 claims abstract description 10
- 239000003999 initiator Substances 0.000 claims abstract description 9
- 241000700608 Sagitta Species 0.000 claims description 4
- 230000009172 bursting Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 6
- 239000012141 concentrate Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 37
- 238000000034 method Methods 0.000 description 18
- 239000006260 foam Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/22—Elements for controlling or guiding the detonation wave, e.g. tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio, including priming device and air transporting arrangement, priming device includes energy-gathering device, detonation chain and initiator, energy-gathering device includes the middle energy gathering cap for vertically projecting explosive charge energy centralization outward, and middle energy gathering cap is the cylinder of outward opening.Compared with prior art, after explosive charge, the explosion energy of middle energy gathering cap concentrates on the shale that n interrupted dimensional orientations squeeze explosive fracturing area, and crackle is formed through rapidly the shale zone of fracture, the specific surface area of shale is increased, to effectively increase the parsing rate and its recovery ratio of shale gas.Simultaneously as the cumulative action of the outwardly convex of the left boss and right boss of spherical cap shape, further enhances Mohaupt effect.
Description
Technical field
The present invention relates to the device for increasing shale gas recovery ratio, in particular to a kind of cylinder cumulative pressure break increases shale gas and adopts
The device of yield.
Background technique
Shale gas is a kind of emerging clear energy sources, because its reserves is big, long the features such as in exploitation period due to receive much attention.However
As gas storage carrier shale body because its Natural porosity it is small, permeability is low, and 95% shale gas well is needed through artificial fracturing
Mode increase shale body permeability, can have commercial mining value.
Currently, the method for artificial fracturing mainly includes two classes: first is that hydraulic fracturing method, second is that foam fracturing method.Water
It forces cracking method and mainly achievees the purpose that fracturing rock stratum by injecting highly pressurised liquid into drilling.According to specific fracturing technology,
Hydraulic fracturing method includes three kinds of multistage fracturing, riverfrac treatment, hydraulic jetting fracturing etc..Multistage fracturing is to utilize ball sealer or limit
Flow Technique separates the technology that reservoir different layers position carries out staged fracturing.Riverfrac treatment is produced using a large amount of clear water injection stratum induction
The fracturing technique in raw water conservancy diversion crack.Hydraulic jetting fracturing is to carry sand body using high speed and high-pressure fluid to carry out perforation and open to split
The fracturing technique of seam.Foam fracturing method mainly reaches the mesh of fracturing rock stratum by injecting the liquid gas mixture of high pressure into drilling
's.According to the difference of gas componant, foam fracturing method can be divided into nitrogen foam pressure break and carbon dioxide foaming pressure break etc. two
Kind.Hydraulic fracturing method and foam fracturing method exist in the fracturing process of rammell is difficult to the shortcomings that overcoming: first is that pressure break
A large amount of chemical agents are equipped in liquid, it is big to formation damage；Second is that after the perforation of pressure break later period major fracture, the leakage of fracturing fluid compared with
It is serious；Third is that the anti-row of fracturing fluid is slower.Most important, the occurrence form of shale gas is based on adsorbed gas, only by broken
Broken method increases the specific surface area of shale body, just can increase the parsing amount of adsorbed gas, and above-mentioned two classes fracturing process is main
Achieve the purpose that volume increase by the natural fissure in perforation rock mass, the preservation characteristic of this and shale gas itself is inconsistent.
Chinese patent CN102168543B discloses a kind of method and dress for increasing shale gas recovery ratio by explosive manner
It sets, it includes loading priming device and air transporting arrangement that described device, which is arranged in shale gas well naked eye, and wherein loading detonation fills
It sets for surrounding shale to burst apart, air transporting arrangement will be transported to ground by the shale gas oozed out in the shale that is burst apart
Face；This method and device have that explosive charge power dissipation, explosive charge capacity usage ratio are low.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the defect of the prior art, the one kind for overcoming above-mentioned technical problem is provided
The device of cylinder cumulative pressure break increase shale gas recovery ratio.
In order to solve the above-mentioned technical problem, a kind of cylinder cumulative pressure break of the present invention increases the device of shale gas recovery ratio
Technical solution it is as follows:
A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio, and described device is arranged in shale gas well naked eye,
Described device includes priming device and air transporting arrangement, and priming device is for bursting apart surrounding shale, gas conveying dress
Ground will be transported to by the shale gas oozed out in the shale that is burst apart by setting, and the priming device includes detonation chain and initiator,
The air transporting arrangement includes right flange, isolating device, Oil/Gas Pipe, poroid air inlet pipe；The poroid air inlet pipe is arranged in institute
It states between isolating device and the right flange, one end of poroid air inlet pipe is arranged in the through-hole of the right flange, and the other end is set
It sets in the through-hole in isolating device；Poroid air inlet pipe is the pipe with several air inlets, and one end setting of Oil/Gas Pipe is being isolated
In the through-hole of device, the other end is connected with ground gas collecting apparatus；
The priming device further includes energy-gathering device, and the energy-gathering device includes that explosive charge energy centralization is vertically outside
The middle energy gathering cap projected, the left flange and the casing that are arranged on the left of middle energy gathering cap；
The middle energy gathering cap includes middle concave outer surface and middle concave inner surface, and the middle concave outer surface is by n shape
And circumferentially equally distributed, outward opening cylinder composition identical with size, n 3,4,5,6,7 or 8；In the middle concave
Surface is identical by m shape and size and circumferentially equally distributed, outward opening cylinder forms, m 3,4,5,6,7 or 8
And m=n；N cylinder of the middle concave inner surface forms cavity；The left flange, middle energy gathering cap and right flange form one
Enclosure space, and explosive is set in the space；The maximum outside diameter of the middle energy gathering cap is Dc, the length of the middle energy gathering cap is
Lc；
Be outside described sleeve pipe cylinder and its inside be cylindrical hole, described sleeve pipe sequentially passes through the middle concave inner surface
Cavity and right flange through-hole, described sleeve pipe one end is fixed on the right side of left flange, and the described sleeve pipe other end is fixed on the right side
The right side of flange；
Left boss is provided on the right side of the left flange, the left boss is the spherical cap shape of outwardly convex, and the left side is convex
The height of projection of platform spherical cap shape is Ht, the maximum open part diameter of a circle of the left boss spherical cap shape is Dt；
Right boss is provided on the left of the right flange, the right boss is the spherical cap shape of outwardly convex, and the right side is convex
The height of projection of platform spherical cap shape is Ht, the maximum open part diameter of a circle of the right boss spherical cap shape is Dt；
The diameter DtFor explosive diameter D, the height HtFor 4mm~6mm.
Preferably, a cylinder in n cylinder of the middle concave outer surface is cylinder E, the straight edge line of the cylinder E
It is parallel to XcThe directrix of axis, the cylinder E is directrix E, and the straight edge line of the cylinder E moves in parallel to be formed along the directrix E
The cylinder E, the directrix E are the curves of outward opening；
A cylinder in m cylinder of the middle concave inner surface is cylinder F, and the straight edge line of the cylinder F is parallel to
XcThe directrix of axis, the cylinder F is directrix F, and the straight edge line of the cylinder F moves in parallel to form the column along the directrix F
Face F, the directrix F are the curves of outward opening；
Establish Oc-XcYcZcCoordinate system: Oc-XcYcZcThe coordinate origin of coordinate system on the axis of the middle energy gathering cap and
The midpoint of the length of middle energy gathering cap, XcAxis, YcAxis and ZcAxis constitutes right hand rectangular coordinate system, XcThe axis of axis and the middle energy gathering cap
Line is overlapped, XcAxis positive direction therefrom energy gathering cap left side be directed toward in energy gathering cap right side；xc、ycAnd zcRespectively XcAxis, YcAxis and
ZcThe coordinate variable of axis；
DcFor 280mm~320mm, LcFor 380mm~420mm.
Preferably, the directrix E and directrix F is all parabola or is all circular arc.
Preferably, the directrix E is the parabola being made of following equation:
yc=a3+b3zc 2；
The directrix F is the parabola being made of following equation:
yc=a4+b4zc 2；
In various above:
a3、b3、a4And b4For parameter, a3For Dc0.2~0.3 times, a4For Dc0.15~0.25 times and a3>a4, b3、b4By
Following formula calculates:
In formula: e3、e4For coefficient, e3For 0.7~0.9, e4For 0.9~1.1 and e4>e3。
Preferably, the directrix E is one section of circular arc, loaded length L of the circular arc center of circle in middle energy gathering capcMiddle position and
With the XcThe distance of axis is Lc1, arc radius Rc1；
The directrix F is one section of circular arc, loaded length L of the circular arc center of circle in middle energy gathering capcMiddle position and with the Xc
The distance of axis is Lc2, arc radius Rc2；
Rc1、Rc2、Lc1And Lc2It calculates as follows respectively:
Hc1And Hc2It is sagitta, Hc1For charge diameter Dc0.1~0.3 times, Hc2For charge diameter Dc0.11~0.31
Times and Hc2>Hc1。
Preferably, the parameter n=4, m=4, Dc=300mm, Lc=400mm, a3=60mm, a4=45mm, e3=0.8,
e4=1.0, Ld=209.132mm, b3=0.0055, b4=0.0069.
Preferably, the parameter n=4, m=4, Dc=300mm, Lc=400mm, Hc1=60mm, Hc2=66mm, Ld=
209.132mm, Rc1=121.117mm, Lc1=167.182mm, Rc2=115.834mm, Lc2=155.899mm.
Compared with prior art, the beneficial effects of the invention are that: due to Mohaupt effect, parabolical optical characteristics, pass through
Middle energy gathering cap projects explosive charge energy centralization, and explosive charge capacity usage ratio is high, while improving the page in explosive fracturing area
The length of lithofraction line and the quantity of shale crackle；Especially because the cumulative action of middle energy gathering cap, explosive charge energy concentrates on n
Vertically outwardly against the shale in explosive fracturing area, crackle is formed through rapidly the shale zone of fracture, increases a interrupted dimensional orientation
The specific surface area of shale, to effectively increase the parsing rate and its recovery ratio of shale gas.Simultaneously as a left side for spherical cap shape
The cumulative action of the outwardly convex of boss, right boss, further enhances Mohaupt effect.
Detailed description of the invention
Fig. 1 is schematic device；
Fig. 2 is middle energy gathering cap structural schematic diagram；
Fig. 3 is the structural schematic diagram of energy gathering cap A-A section in embodiment one；
Fig. 4 is the structural schematic diagram of energy gathering cap A-A section in embodiment two；
In above-mentioned Fig. 1-Fig. 4: 1- shale gas well naked eye, 2- Oil/Gas Pipe, the poroid air inlet pipe of 3-, 7- air inlet, 8- middle concave
Outer surface, 9- middle concave inner surface, energy gathering cap in 10-, the left flange of 13-, 17- casing, the right flange of 18-, 19- isolating device, 20-
Initiator, 21- detonation chain, 22- directrix E, 23- directrix F.
Specific embodiment
Below in conjunction with Figure of description, preferred embodiment of the present invention will be described, it should be understood that described herein
Preferred embodiment is only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio, and described device is arranged in shale gas well naked eye 1,
Described device includes priming device and air transporting arrangement, and priming device is for bursting apart surrounding shale, gas conveying dress
Ground will be transported to by the shale gas oozed out in the shale that is burst apart by setting, and the priming device includes detonation chain 21 and initiator
20, the air transporting arrangement includes right flange 18, isolating device 19, Oil/Gas Pipe 2, poroid air inlet pipe 3；The poroid air inlet pipe
3 are arranged between the isolating device 19 and the right flange 18, and the right flange 18 is arranged in one end of poroid air inlet pipe 3
In through-hole, the other end is arranged in the through-hole in isolating device 19；Poroid air inlet pipe 3 is the pipe with several air inlets, oil gas
One end of pipe 2 is arranged in the through-hole of isolating device 19, and the other end is connected with ground gas collecting apparatus；The priming device further includes
Energy-gathering device, the energy-gathering device include the middle energy gathering cap 10 for vertically projecting explosive charge energy centralization outward, are arranged in
The left flange 13 and casing 17 in 10 left side of energy gathering cap；
The middle energy gathering cap 10 includes middle concave outer surface 8 and middle concave inner surface 9, and the middle concave outer surface 8 is by n
Shape and size are identical and circumferentially equally distributed, outward opening cylinder forms, n 3,4,5,6,7 or 8；The concave
Shape inner surface 9 is identical by m shape and size and circumferentially equally distributed, outward opening cylinder forms, m 3,4,5,6,
7 or 8 and m=n；N cylinder of the middle concave inner surface 9 forms cavity；The maximum outside diameter of the middle energy gathering cap 10 is Dc, institute
The length for stating middle energy gathering cap 10 is Lc；
Be cylindrical outside described sleeve pipe 17 and its inside be cylindrical hole, described sleeve pipe 17 sequentially passes through in the middle concave
The through-hole of the cavity on surface 9 and right flange 18,17 one end of described sleeve pipe are fixed on the right side of left flange 13, and described sleeve pipe 17 is another
One end is fixed on the right side of right flange 18；
Several initiators 20 are arranged in interval on the right surface of the left flange 13 and the left surface of the right flange 18,
Initiator 20 passes through the detonation chain 21 being arranged in described sleeve pipe 17 and connect with ground control unit, and is controlled and filled by ground
Set the detonation of control initiator 20；
The right side of the left flange 13 is provided with left boss, and the left boss is the spherical cap shape of outwardly convex, the left side
The height of projection of boss spherical cap shape is Ht, the maximum open part diameter of a circle of the left boss spherical cap shape is Dt；
The left side of the right flange 18 is provided with right boss, and the right boss is the spherical cap shape of outwardly convex, the right side
The height of projection of boss spherical cap shape is Ht, the maximum open part diameter of a circle of the right boss spherical cap shape is Dt；
The right boss of the left boss and right flange 18 of the cavity of the middle energy gathering cap 10 and left flange 13 forms a closing
Space, and explosive is set in the space；
The diameter DtFor explosive diameter D, the height HtFor 4mm~6mm.
A cylinder in n cylinder of the middle concave outer surface 8 is cylinder E, and the straight edge line of the cylinder E is parallel to
XcThe directrix of axis, the cylinder E is directrix E 22, and the straight edge line of the cylinder E moves in parallel to be formed along the directrix E 22
The cylinder E, the directrix E 22 are the curves of outward opening；
A cylinder in m cylinder of the middle concave inner surface 9 is cylinder F, and the straight edge line of the cylinder F is parallel to
XcThe directrix of axis, the cylinder F is directrix F 23, and the straight edge line of the cylinder F moves in parallel to be formed along the directrix F 23
The cylinder F, the directrix F 23 are the curves of outward opening；
Establish Oc-XcYcZcCoordinate system: Oc-XcYcZcThe coordinate origin of coordinate system on the axis of the middle energy gathering cap 10 and
At the midpoint of the length of middle energy gathering cap 10, XcAxis, YcAxis and ZcAxis constitutes right hand rectangular coordinate system, XcAxis and the middle energy gathering cap
10 axis is overlapped, XcAxis positive direction therefrom energy gathering cap 10 left side be directed toward in energy gathering cap 10 right side；xc、ycAnd zcRespectively Xc
Axis, YcAxis and ZcThe coordinate variable of axis；
DcFor 280mm~320mm, LcFor 380mm~420mm.
Embodiment one.
The directrix E22 is the parabola being made of following equation:
yc=a3+b3zc 2； (15)
The directrix F23 is the parabola being made of following equation:
yc=a4+b4zc 2； (16)
In various above:
DcFor 280mm~320mm, LcFor 380mm~420mm；
The outer garden n equal part of maximum of middle energy gathering cap 10, equal part arc length be by n cylinder of middle concave outer surface 8DcFor the maximum outside diameter of middle energy gathering cap 10, it is contemplated that performance requirement and the manufacture craft requirement of middle energy gathering cap 10
Deng selection
a3、b3、a4And b4For parameter, a3For Dc0.2~0.3 times, a4For Dc0.15~0.25 times and a3>a4。
Known parabola is by vertex (0, a3, 0) and other two points Then rule of thumb, b3、b4It is calculated by following formula:
In formula: e3、e4For coefficient, e3For 0.7~0.9, e4For 0.9~1.1 and e4>e3。
The present embodiment is chosen: n=4, m=4, Dc=D, that is, Dc=300mm, Lc=L, that is, Lc=400mm, takes a3For Dc0.2
I.e. a again3=60mm, takes a4For Dc0.15 times i.e. a4=45mm and meet a3>a4, take e3=0.8 and e4=1.0 and meet e4>
e3, it brings formula (16-1), (16-2) and (16-3) into respectively, obtains:
The technical solution of the present embodiment and its major parameter determination finish as a result,.
Embodiment two.
The directrix E 22 is one section of circular arc, loaded length L of the circular arc center of circle in middle energy gathering cap 10cMiddle position and with
The XcThe distance of axis is Lc1, arc radius Rc1；
The directrix F 23 is also one section of circular arc, loaded length L of the circular arc center of circle in middle energy gathering cap 10cMiddle position and
With the XcThe distance of axis is Lc2, arc radius Rc2；
The outer garden n equal part of maximum of middle energy gathering cap 10, equal part arc length be by n circular arc cylinder of middle concave outer surface 8DcFor the maximum outside diameter of middle energy gathering cap 10, it is contemplated that performance requirement and the manufacture craft requirement of middle energy gathering cap 10
Deng selection
According to known chord length LcWith sagitta Hc1、Hc2Seek radius Rc1、Rc2Formula, Rc1、Rc2、Lc1And Lc2Following public affairs are pressed respectively
Formula calculates:
Hc1And Hc2It is sagitta, Hc1For charge diameter Dc0.1~0.3 times, Hc2For charge diameter Dc0.11~0.31
Times and Hc2>Hc1。
The present embodiment is chosen: n=4, m=4, Dc=D, that is, Dc=300mm, Lc=L, that is, Lc=400mm, takes Hc1For Dc0.2
I.e. H againc1=60mm, takes Hc2For Dc0.22 times i.e. Hc2=66mm and meet Hc2>Hc1Bring into respectively formula (17), (18),
(19), (20) and (21), obtain:
The technical solution of the present embodiment and its major parameter determination finish as a result,.
Embodiment two is the middle concave outer surface 8 of middle energy gathering cap 10 and middle concave inner surface 9 with one difference of embodiment
Shape of generatrix it is different.
The comprehensive Mohaupt effect of above embodiments is preferable.
According to Mohaupt effect, after explosive charge, explosion product is at high temperature under high pressure substantially along explosive normal to a surface side
To what is dispersed outward, therefore, explosive with groove will appear one is converged, speed and pressure after ignition in recess axis
Strong all very high explosion product stream, the explosion energy in a certain range releasing explosive charge are put together.This hair
The outer surface of bright middle energy gathering cap 10 and inner surface are the cylinder of outward opening, 8 He of middle concave outer surface of middle energy gathering cap 10
Middle concave inner surface 9 is a by n or a (m=n) shape and size of m are identical and circumferentially equally distributed cylinder forms；Explosive
After explosion, the explosion energy of middle energy gathering cap 10 concentrates on the shale that n interrupted dimensional orientations squeeze explosive fracturing area, and crackle is rapid
It is formed through the shale zone of fracture, increases the specific surface area of shale, to effectively increase the parsing rate of shale gas and its adopt
Yield.Other than the parabolic cylinder and circular arc cylinder of embodiment one and embodiment two, technical solution of the present invention can also be double
The cylinder of other outward openings such as bent cylinder and elliptic cylinder, it may have similar effect.Simultaneously as a left side for spherical cap shape is convex
The cumulative action of the outwardly convex of platform, right boss, further enhances Mohaupt effect.
Wall thickness for energy gathering cap 10 in guarantee is gradually reduced from centre to two sides, it is desirable that a3>a4Or Hc2>Hc1。
Parameter a3、a4、e3、e4Hc2、Hc1Value, should be selected according to performances such as the hardness of shale, parameter a3、a4、e3、e4Value
Smaller and Hc2、Hc1Value it is bigger, explosion energy convergence more concentrate, explosive fracturing area is deep and narrow, the length of shale crackle is longer；
Conversely, explosion energy convergence more dissipates, explosive fracturing area is wide and shallow, shale crackle length is shorter.a3For Dc0.2~0.3
Times, a4For Dc0.15~0.25 times and a3>a4；e3For 0.7~0.9, e4For 0.9~1.1 and e4>e3, Hc2For charge diameter Dc's
0.11~0.31 times and Hc2>Hc1。
Middle energy gathering cap 10 is made by the aluminium alloy of 7A09 model, and cost performance is best.
Left flange 13 and right flange 18 are made by 4350 steel alloys, and cost performance is best.
Described sleeve pipe 17 is made by HP9-4-20 type high temperature resistant stainless steel pipe, and cost performance is best.
A kind of cylinder cumulative pressure break disclosed in this invention increases the device of shale gas recovery ratio, in production, in advance will
Explosive is put into priming device, and then whole device is arranged in shale gas well naked eye 1 again；Initiator 20 includes electric thunder
Pipe, digital primer etc., detonation mode include electric initiating, digital detonation etc.；The explosive includes liquid explosives, solid explosive etc..
Above embodiments are primary structure of the invention, form parameter, remaining CONSTRUCTED SPECIFICATION is common according to this professional domain
Common technical knowledge and conventional techniques are designed and select.
Claims (7)
1. a kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio, described device is arranged in shale gas well naked eye, institute
Stating device includes priming device and air transporting arrangement, and priming device is for bursting apart surrounding shale, air transporting arrangement
Ground will be transported to by the shale gas oozed out in the shale that is burst apart, the priming device includes detonation chain and initiator, institute
Stating air transporting arrangement includes right flange, isolating device, Oil/Gas Pipe, poroid air inlet pipe；The poroid air inlet pipe is arranged described
Between isolating device and the right flange, one end of poroid air inlet pipe is arranged in the through-hole of the right flange, other end setting
In through-hole in isolating device；Poroid air inlet pipe is the pipe with several air inlets, and one end setting of Oil/Gas Pipe is filled in isolation
In the through-hole set, the other end is connected with ground gas collecting apparatus；It is characterized in that, the priming device further includes energy-gathering device, institute
Stating energy-gathering device includes the middle energy gathering cap for vertically projecting explosive charge energy centralization outward, the left side being arranged on the left of middle energy gathering cap
Flange and casing；
The middle energy gathering cap includes middle concave outer surface and middle concave inner surface, and the middle concave outer surface is by n shape and ruler
Very little identical and circumferentially equally distributed, outward opening cylinder composition, n 3,4,5,6,7 or 8；The middle concave inner surface
It is identical by m shape and size and circumferentially equally distributed, outward opening cylinder forms, m 3,4,5,6,7 or 8 and m=
n；N cylinder of the middle concave inner surface forms cavity；It is empty that the left flange, middle energy gathering cap and right flange form a closing
Between, and explosive is set in the space；The maximum outside diameter of the middle energy gathering cap is Dc, the length of the middle energy gathering cap is Lc；
Be outside described sleeve pipe cylinder and its inside be cylindrical hole, described sleeve pipe sequentially passes through the sky of the middle concave inner surface
The through-hole of chamber and right flange, described sleeve pipe one end are fixed on the right side of left flange, and the described sleeve pipe other end is fixed on right flange
Right side；
Left boss is provided on the right side of the left flange, the left boss is the spherical cap shape of outwardly convex, the left boss ball
The height of projection of crown shape is Ht, the maximum open part diameter of a circle of the left boss spherical cap shape is Dt；
Right boss is provided on the left of the right flange, the right boss is the spherical cap shape of outwardly convex, the right boss ball
The height of projection of crown shape is Ht, the maximum open part diameter of a circle of the right boss spherical cap shape is Dt；
The diameter DtFor explosive diameter D, the height HtFor 4mm~6mm.
2. the device that a kind of cylinder cumulative pressure break according to claim 1 increases shale gas recovery ratio, which is characterized in that
A cylinder in n cylinder of the middle concave outer surface is cylinder E, and the straight edge line of the cylinder E is parallel to XcAxis,
The directrix of the cylinder E is directrix E, and the straight edge line of the cylinder E moves in parallel to form the cylinder E, institute along the directrix E
State the curve that directrix E is outward opening；
A cylinder in m cylinder of the middle concave inner surface is cylinder F, and the straight edge line of the cylinder F is parallel to XcAxis,
The directrix of the cylinder F is directrix F, and the straight edge line of the cylinder F moves in parallel to form the cylinder F, institute along the directrix F
State the curve that directrix F is outward opening；
Establish Oc-XcYcZcCoordinate system: Oc-XcYcZcThe coordinate origin of coordinate system is gathered on the axis of the middle energy gathering cap and in
The midpoint for the length that can be covered, XcAxis, YcAxis and ZcAxis constitutes right hand rectangular coordinate system, XcThe axis weight of axis and the middle energy gathering cap
It closes, XcAxis positive direction therefrom energy gathering cap left side be directed toward in energy gathering cap right side；xc、ycAnd zcRespectively XcAxis, YcAxis and ZcAxis
Coordinate variable；
DcFor 280mm~320mm, LcFor 380mm~420mm.
3. the device that a kind of cylinder cumulative pressure break according to claim 2 increases shale gas recovery ratio, which is characterized in that institute
It states directrix E and directrix F is all parabola or is all circular arc.
4. the device that a kind of cylinder cumulative pressure break according to claim 3 increases shale gas recovery ratio, which is characterized in that
The directrix E is the parabola being made of following equation:
yc=a3+b3zc 2；
The directrix F is the parabola being made of following equation:
yc=a4+b4zc 2；
In various above:
a3、b3、a4And b4For parameter, a3For Dc0.2~0.3 times, a4For Dc0.15~0.25 times and a3>a4, b3、b4By following
Formula calculates:
In formula: e3、e4For coefficient, e3For 0.7~0.9, e4For 0.9~1.1 and e4>e3。
5. the device that a kind of cylinder cumulative pressure break according to claim 3 increases shale gas recovery ratio, which is characterized in that
The directrix E is one section of circular arc, loaded length L of the circular arc center of circle in middle energy gathering capcMiddle position and with the XcAxis
Distance is Lc1, arc radius Rc1；
The directrix F is one section of circular arc, loaded length L of the circular arc center of circle in middle energy gathering capcMiddle position and with the XcAxis
Distance is Lc2, arc radius Rc2；
Rc1、Rc2、Lc1And Lc2It calculates as follows respectively:
Hc1And Hc2It is sagitta, Hc1For charge diameter Dc0.1~0.3 times, Hc2For charge diameter Dc0.11~0.31 times and
Hc2>Hc1。
6. the device that a kind of cylinder cumulative pressure break according to claim 4 increases shale gas recovery ratio, which is characterized in that institute
State parameter n=4, m=4, Dc=300mm, Lc=400mm, a3=60mm, a4=45mm, e3=0.8, e4=1.0, Ld=
209.132mm, b3=0.0055, b4=0.0069.
7. the device that a kind of cylinder cumulative pressure break according to claim 5 increases shale gas recovery ratio, which is characterized in that institute
State parameter n=4, m=4, Dc=300mm, Lc=400mm, Hc1=60mm, Hc2=66mm, Ld=209.132mm, Rc1=
121.117mm, Lc1=167.182mm, Rc2=115.834mm, Lc2=155.899mm.
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| CN2018102093102 | 2018-03-14 | ||
| CN201810209310.2A CN108571310A (en) | 2018-03-14 | 2018-03-14 | A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio |
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| CN201910190820.4A Pending CN109812253A (en) | 2018-03-14 | 2019-03-13 | A kind of cylinder cumulative pressure break increases the device of shale gas recovery ratio |
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| CN85203131U (en) * | 1985-07-25 | 1986-10-22 | 淮南矿业学院 | Shape (in bore, two sides) charged cutter for engineering explosion |
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| CN103983153A (en) * | 2014-05-23 | 2014-08-13 | 中国科学技术大学 | Case circular discontinuous energy concentrating jet flow cracker |
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