CN108361012B - Device for increasing shale gas recovery ratio by three-combination energy-gathering fracturing of arc surface - Google Patents
Device for increasing shale gas recovery ratio by three-combination energy-gathering fracturing of arc surface Download PDFInfo
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- 230000001965 increasing effect Effects 0.000 title claims abstract description 25
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 239000002360 explosive Substances 0.000 claims abstract description 48
- 238000004880 explosion Methods 0.000 claims abstract description 26
- 230000000977 initiatory effect Effects 0.000 claims description 34
- 239000003999 initiator Substances 0.000 claims description 22
- 238000005336 cracking Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 12
- 238000009825 accumulation Methods 0.000 abstract description 10
- 238000004458 analytical method Methods 0.000 abstract description 4
- 230000037452 priming Effects 0.000 abstract 3
- 238000005422 blasting Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 48
- 238000000034 method Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000006260 foam Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011435 rock Substances 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
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007935 neutral effect Effects 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
- 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
- 239000012141 concentrate Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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
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- 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
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Abstract
The utility model provides a device that increases shale gas recovery rate of three combination energy-gathering fracturing of arc surface, including priming device and gas conveyor, priming device includes three combination energy-gathering devices, priming circuit and blasting unit, three combination energy-gathering device include with the explosive explosion energy assemble the right left energy-gathering cover that jets out, assemble the explosive explosion energy assemble the left right energy-gathering cover that jets out, assemble the explosive explosion energy to the well energy-gathering cover that jets out of centre, left energy-gathering cover and right energy-gathering cover are the outside revolution paraboloid of opening, well energy-gathering cover is the outside revolution arc surface of opening. Compared with the prior art, due to the energy accumulation effect of the left energy accumulation cover, the middle energy accumulation cover and the right energy accumulation cover, the shale in the explosion fracturing area is simultaneously extruded from the left space direction, the middle space direction and the right space direction respectively, the cracks rapidly penetrate through to form a shale fracture zone in a shape like a Chinese character 'ji', the specific surface area of the shale is increased, and therefore the analysis rate and the recovery ratio of the shale gas are effectively increased. The spherical crown shaped boss further enhances the energy gathering effect.
Description
Technical Field
The invention relates to a device for increasing shale gas recovery ratio, in particular to a device for increasing shale gas recovery ratio by three-combination energy-gathering fracturing of an arc surface.
Background
Shale gas is a new clean energy source, and is paid much attention due to the characteristics of large reserves, long mining period and the like. However, the shale body used as the gas storage carrier has low natural porosity and low permeability, and 95 percent of shale gas wells need to increase the permeability of the shale body in an artificial fracturing mode, so that the shale body has industrial exploitation value.
At present, the artificial cracking method mainly comprises two types: the first is a hydraulic fracturing method, and the second is a foam fracturing method. The hydraulic fracturing method mainly achieves the purpose of fracturing rock stratum by injecting high-pressure liquid into a drill hole. According to a specific fracturing process, the hydraulic fracturing method comprises three types of multi-stage fracturing, clear water fracturing, hydraulic jet fracturing and the like. The multistage fracturing is a technology for separating different layers of a reservoir stratum by using a plugging ball or a current limiting technology to perform staged fracturing. The clear water fracturing is a fracturing technology for inducing a diversion fracture by injecting a large amount of clear water into a stratum. Hydraulic jet fracturing is a fracturing technique that utilizes high velocity and high pressure fluids to carry sand bodies for perforation and fracture opening. The foam fracturing method mainly achieves the purpose of fracturing a rock stratum by injecting a high-pressure liquid-gas mixture into a drill hole. According to different gas components, the foam fracturing method can be divided into nitrogen foam fracturing, carbon dioxide foam fracturing and the like. The hydraulic fracturing method and the foam fracturing method have the defects which are difficult to overcome in the fracturing process of the shale layer: the fracturing fluid is provided with a large amount of chemical agents, so that the damage to the stratum is large; secondly, after the main crack in the later stage of fracturing is communicated, the leakage of the fracturing fluid is serious; thirdly, the reverse drainage of the fracturing fluid is slow. Most importantly, the occurrence form of shale gas is mainly adsorbed gas, and the analysis amount of the adsorbed gas can be increased only by increasing the specific surface area of the shale body through a crushing method, while the two types of fracturing methods mainly achieve the purpose of increasing the yield by penetrating through natural fractures in the rock body, which is inconsistent with the occurrence characteristics of the shale gas.
Chinese patent CN102168543B discloses a method and a device for increasing shale gas recovery efficiency by explosion, wherein the device is arranged in an open hole of a shale gas well and comprises a explosive conveying initiating device and a gas conveying device, wherein the explosive conveying initiating device is used for cracking shale around the explosive conveying initiating device, and the gas conveying device conveys shale gas seeped from cracked shale to the ground; the method and the device have the problems of explosive explosion energy dispersion and low explosive explosion energy utilization rate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device for increasing the shale gas recovery rate by three combined energy-gathering fracturing on a circular arc surface, which overcomes the technical problems.
In order to solve the technical problems, the technical scheme of the device for increasing the shale gas recovery rate by three combined energy-gathering fracturing on the circular arc surface is as follows:
a device for increasing shale gas recovery ratio by three-combination energy-gathering fracturing of an arc surface is arranged in an open hole of a shale gas well and comprises an initiation device and a gas conveying device, wherein the initiation device is used for cracking shale around the initiation device, the gas conveying device conveys shale gas seeped from the cracked shale to the ground, the initiation device comprises an initiation circuit and an initiator, and the gas conveying device comprises a right flange, an isolating device, an oil-gas pipe and a porous gas inlet pipe; the hole-shaped air inlet pipe is arranged between the isolating device and the right flange, one end of the hole-shaped air inlet pipe is arranged in the through hole of the right flange, and the other end of the hole-shaped air inlet pipe is arranged in the through hole on the isolating device; the porous air inlet pipe is a pipe with a plurality of air inlets, one end of the oil gas pipe is arranged in the through hole of the isolating device, and the other end of the oil gas pipe is connected with the ground gas collecting device; the detonating device also comprises three combined energy gathering devices, wherein each three combined energy gathering device comprises a left energy gathering cover for gathering explosive explosion energy to emit rightwards, a right energy gathering cover for gathering the explosive explosion energy to emit leftwards, a middle energy gathering cover for gathering the explosive explosion energy to emit rightwards, a left flange arranged on the left side of the left energy gathering cover, a left middle flange arranged between the left energy gathering cover and the middle energy gathering cover, and a right middle flange and a sleeve arranged between the right energy gathering cover and the middle energy gathering cover;
the left energy-gathering cover comprises a left concave outer surface and a left concave inner surface, the left concave outer surface and the left concave inner surface are both paraboloids of revolution with outward openings, and the paraboloids of revolution of the left concave inner surface form a cavity; the left energy-gathering cover, the left flange and the left middle flange form a closed space, and explosive is arranged in the space; the maximum outer diameter of the left energy-gathering cover is DaThe length of the left energy collecting cover is La；
The right energy-gathering cover comprises a right concave outer surface and a right concave inner surface, the right concave outer surface and the right concave inner surface are both paraboloids of revolution with outward openings, and the paraboloids of revolution of the right concave inner surface form a cavity; the right energy-gathering cover, the right flange and the right middle flange form a closed space, and explosive is arranged in the space; the maximum outer diameter of the right energy-gathering cover is DbThe length of the right energy-gathering cover is Lb；
The middle energy gathering cover comprises a middle concave outer surface and a middle concave inner surface, the middle concave outer surface and the middle concave inner surface are both rotary arc surfaces with outward openings, and the rotary arc surfaces of the middle concave inner surface form a cavity; the center energy concentrating cover is connected with the left center flangeThe right middle flange forms a closed space, and explosive is arranged in the space; the maximum outer diameter of the middle energy gathering cover is DcThe length of the center energy collecting cover is Lc；
The left middle flange and the right middle flange are respectively provided with a sleeve hole, the outer part of the sleeve is cylindrical, the inner part of the sleeve is a cylindrical hole, the sleeve sequentially penetrates through the cavity of the left concave inner surface, the sleeve hole of the left middle flange, the cavity of the middle concave inner surface, the sleeve hole of the right middle flange, the cavity of the right concave inner surface and the through hole of the right flange, one end of the sleeve is fixed on the right end face of the left flange, and the other end of the sleeve is fixed on the left end face of the right flange;
a plurality of initiators are arranged on the right surface of the left flange and the left surface of the left middle flange at intervals, the initiators are connected with a ground control device through an initiation circuit arranged in the casing pipe, and initiation of the initiators is controlled through the ground control device;
a plurality of initiators are arranged on the left surface of the right flange and the right surface of the right middle flange at intervals, the initiators are connected with a ground control device through an initiation circuit arranged in the sleeve, and initiation of the initiators is controlled through the ground control device;
and a plurality of initiators are arranged on the right surface of the left middle flange and the left surface of the right middle flange at intervals, and the initiators are connected with a ground control device through an initiation circuit arranged in the sleeve and control the initiation of the initiators through the ground control device.
The right side of the left flange is provided with a left boss which is in an outwards convex spherical crown shape, and the convex height of the spherical crown shape of the left boss is HtThe diameter of the maximum opening part circle of the spherical crown shape of the left boss is Dt；
The left side of right flange is provided with right boss, right boss is outside bellied spherical crown shape, the protruding height of right boss spherical crown shape is HtThe diameter of the maximum opening part circle of the right boss spherical cap shape is Dt；
The left side of the left middle flange is provided withThe novel spherical cap is characterized by comprising a middle boss I, wherein the middle boss I is in an outwards convex spherical cap shape, and the convex height of the spherical cap shape of the middle boss I is HtThe diameter of the maximum opening part circle of the spherical crown shape of the middle boss is Dt；
The right side of the left middle flange is provided with a middle boss II, the middle boss II is in a spherical crown shape protruding outwards, and the protruding height of the spherical crown shape of the middle boss II is HtThe diameter of the maximum opening part circle of the spherical crown shape of the left middle boss is Dt；
The left side of the right middle flange is provided with a middle boss III, the middle boss III is in a spherical crown shape protruding outwards, and the protruding height of the spherical crown shape of the middle boss III is HtThe diameter of the maximum opening part circle of the spherical crown shape of the middle boss III is Dt；
A middle boss IV is arranged on the right side of the right middle flange, the middle boss IV is in a spherical crown shape protruding outwards, and the protruding height of the spherical crown shape of the middle boss IV is HtThe diameter of the maximum opening part circle of the middle boss IV spherical crown shape is Dt；
The diameter DtIs the diameter D of explosive, the height HtIs 3 mm-8 mm.
Preferably, the axis of rotation of the left concave outer surface is XaA shaft, the bus of the left concave outer surface is a bus A which surrounds the XaThe axis rotation forms the left concave outer surface, and the generatrix A is a parabola formed by the following equation set:
the rotation axis of the left concave inner surface is XaA shaft, a bus of the left concave inner surface is a bus B, and the bus B surrounds the XaThe axis of rotation forming the left concave inner surface, the generatrix B being a parabola formed by the following system of equations:
the rotating axis of the right concave outer surface is XbA shaft, a bus of the right concave outer surface is a bus C, and the bus C surrounds the XbThe axis of rotation forming the right concave outer surface, the generatrix C being a parabola formed by the following system of equations:
the rotation axis of the right concave inner surface is XbA shaft, a bus of the right concave inner surface is a bus D which is wound around the XbThe axis of rotation forming the right concave inner surface, the generatrix D being a parabola formed by the following system of equations:
the rotation axis of the concave outer surface is XcA shaft, a bus bar of the concave outer surface is a bus bar E, and the bus bar E surrounds the XcThe shaft rotates to form the concave outer surface, the bus E is a section of circular arc, the center of the circular arc is positioned at the charge length L of the central energy collecting covercAnd is intermediate to said XcDistance of axis Lc1Radius of arc Rc1；
The rotation axis of the concave inner surface is XcA shaft, a generatrix of the concave inner surface is a generatrix F which is wound around the XcThe shaft rotates to form the concave inner surface, the bus F is a section of circular arc, the center of the circular arc is positioned at the charge length L of the central energy collecting covercAnd is intermediate to said XcDistance of axis Lc2Radius of arc Rc2；
Rc1、Rc2、Lc1And Lc2Respectively according to the following formula:
Hc1and Hc2Are all arch height, Hc1Diameter of charge Dc0.1 to 0.4 times of (A), Hc2Diameter of charge Dc0.11 to 0.41 times of (A) and Hc2>Hc1。
In the above formulas:
Oa-XaYaZathe origin of coordinates of the coordinate system is on the axis of the left energy concentrating cover and at the midpoint of the length of the left energy concentrating cover, XaAxis, YaAxis and ZaThe axes forming a right-handed rectangular coordinate system, XaThe axis of the shaft coincides with the axis of the left energy-gathering cover, XaThe positive axial direction points from the left side of the left energy-gathering cover to the right side of the left energy-gathering cover; x is the number ofa、yaAnd zaAre each XaAxis, YaAxis and ZaCoordinate variables of the axes;
Oa1-Xa1Ya1Za1the origin of coordinates of the coordinate system is Oa-XaYaZaIn the coordinate system is (-b)1,c1,0)，Xa1Axis, Ya1Axis and Za1The axes forming a right-handed rectangular coordinate system, Za1Axis and ZaAxis parallel, Xa1Axis and XaAngle of axis thetaa；xa1、ya1And za1Are each Xa1Axis, Ya1Axis and Za1Coordinate variables of the axes;
Oa2-Xa2Ya2Za2the origin of coordinates of the coordinate system is Oa-XaYaZaIn the coordinate system is (-b)2,c2,0)，Xa2Axis, Ya2Axis and Za2The axes forming a right-handed rectangular coordinate system, Za2Axis and ZaAxis parallel, Xa2Axis and XaAngle of axis thetaa；xa2、ya2And za2Are each Xa2Axis, Ya2Axis and Za2Coordinate variables of the axes;
Ob-XbYbZbthe origin of coordinates of the coordinate system is on the axis of the right energy concentrating cover and at the midpoint of the length of the right energy concentrating cover, XbAxis, YbAxis and ZbThe axes forming a right-handed rectangular coordinate system, XbThe axis of the shaft coincides with the axis of the right energy-gathering cover, XbThe positive axial direction points from the left side of the right energy gathering cover to the right side of the right energy gathering cover; x is the number ofb、ybAnd zbAre each XbAxis, YbAxis and ZbCoordinate variables of the axes;
Ob1-Xb1Yb1Zb1the origin of coordinates of the coordinate system is Ob-XbYbZbIn the coordinate system is (b)1,c1,0)，Xb1Axis, Yb1Axis and Zb1The axes forming a right-handed rectangular coordinate system, Zb1Axis and ZbAxis parallel, Xb1Axis and XbAngle of axis thetab；xb1、yb1And zb1Are each Xb1Axis, Yb1Axis and Zb1Coordinate variables of the axes;
Ob2-Xb2Yb2Zb2the origin of coordinates of the coordinate system is Ob-XbYbZbIn the coordinate system is (b)2,c2,0)，Xb2Axis, Yb2Axis and Zb2The axes forming a right-handed rectangular coordinate system, Zb2Axis and ZbAxis parallel, Xb2Axis and XbAngle of axis thetab；xb2、yb2And zb2Are each Xb2Axis, Yb2Axis and Zb2Coordinate variables of the axes;
Oc-XcYcZcthe origin of coordinates of the coordinate system is on the axis of the said centre-concentrating mantle and at the midpoint of the length of the centre-concentrating mantle, XcAxis, YcAxis and ZcThe axes forming a right-handed rectangular coordinate system, XcThe axis of the shaft coincides with the axis of the central energy collecting cover, XcThe positive direction of the axis points to the right side of the central energy gathering cover from the left side of the central energy gathering cover; x is the number ofc、ycAnd zcAre each XcAxis, YcAxis and ZcCoordinate variables of the axes;
Xaaxis, XbAxis and XcThe axes are collinear;
Daand DbAre equal and are both D, LaAnd LbAre equal and are all L, thetaa＝-θ，θb＝θ；
D is 100 mm-800 mm, L is 200 mm-1000 mm, theta is 00～600；
DcIs 100 mm-800 mm, Lc200 mm-1000 mm;
h is the minimum wall thickness of the left energy-gathering cover and the right energy-gathering cover, and H is 1 mm-10 mm;
a1、b1、c1、a2、b2、c2is a parameter, c10.2 to 0.90 times of D, c2C is 0.15 to 0.85 times of D1>c2；
Solving the following system of equations to obtain a1、b1A value of1>0：
Solving the following system of equations to obtain a2、b2A value of2>0：
Preferably, the parameters are: d is 200 mm-500 mm, L is 300 mm-600 mm, Dc200 mm-500 mm, Lc300 mm-600 mm;
preferably, the parameters are: theta is 300～500；
Preferably, said parameter c1Is 0.2 to 0.6 times of D, c2C is 0.15 to 0.55 times of D1>c2；
Preferably, the arch height Hc1Diameter of charge Dc0.2 to 0.35 times of (C), Hc2Diameter of charge Dc0.21 to 0.36 times of (A) and Hc2>Hc1；
Preferably, the radial minimum wall thickness H is 1mm to 5 mm.
Compared with the prior art, the invention has the beneficial effects that: due to the energy accumulation effect, the optical characteristic of a parabola and the characteristic that the arc reflection is accumulated to the circle center, the explosive explosion energy is accumulated and ejected through the left energy accumulation cover, the middle energy accumulation cover and the right energy accumulation cover, the utilization rate of the explosive explosion energy is high, and the shale crack length and the shale crack number of an explosion fracturing area are improved; particularly, due to the energy gathering effect of the left energy gathering cover, the middle energy gathering cover and the right energy gathering cover, shale in an explosion fracturing area is simultaneously extruded from the left space direction, the middle space direction and the right space direction, cracks rapidly penetrate through to form a shale fracture zone in a shape like a Chinese character 'mi', the specific surface area of the shale is increased, the analysis rate and the recovery ratio of shale gas are effectively increased, and due to the outward protruding energy gathering effect of the left boss, the right boss, the middle boss I, the middle boss II, the middle boss III and the middle boss IV in the shapes of spherical crowns, the energy gathering effect is further enhanced.
Drawings
FIG. 1 is a schematic view of the apparatus;
FIG. 2 is a schematic view of a left concentrator cap configuration;
FIG. 3 is a schematic view of a right concentrator cap configuration;
FIG. 4 is a schematic view of a center-focused shroud configuration;
in the above fig. 1 to 4: 1-shale gas well open hole, 2-oil gas pipe, 3-porous gas inlet pipe, 4-gas inlet hole, 5-right concave outer surface, 6-right concave inner surface, 7-right energy gathering cover, 8-middle concave outer surface, 9-middle concave inner surface, 10-middle energy gathering cover, 11-left concave outer surface, 12-left concave inner surface, 13-left flange, 14-left energy gathering cover, 15-left middle flange, 16-right middle flange, 17-sleeve, 18-right flange, 19-isolating device, 20-exploder and 21-exploding circuit.
Detailed Description
The preferred embodiments of the present invention are described below with reference to the drawings of the specification, and it should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention, and are not intended to limit the present invention to a circular-arc three-combination cumulative fracturing shale gas recovery enhancement device, which is disposed in a shale gas well open hole 1 and comprises an initiation device and a gas delivery device, wherein the initiation device is used for fracturing shale around the initiation device, the gas delivery device is used for delivering shale gas seeped from the fractured shale to the ground, the initiation device comprises an initiation circuit 21 and an initiator 20, and the gas delivery device comprises a right flange 18, a separation device 19, an oil and gas pipe 2 and a porous gas inlet pipe 3; the hole-shaped air inlet pipe 3 is arranged between the isolating device 19 and the right flange 18, one end of the hole-shaped air inlet pipe 3 is arranged in a through hole of the right flange 18, and the other end of the hole-shaped air inlet pipe is arranged in a through hole on the isolating device 19; the porous air inlet pipe 3 is a pipe with a plurality of air inlet holes 4, one end of the oil gas pipe 2 is arranged in a through hole of the isolating device 19, and the other end is connected with the ground gas collecting device; the detonating device also comprises three combined energy gathering devices, wherein the three combined energy gathering devices comprise a left energy gathering cover 14 for gathering explosive explosion energy to emit rightwards, a right energy gathering cover 7 for gathering explosive explosion energy to emit leftwards, a middle energy gathering cover 10 for gathering explosive explosion energy to emit rightwards, a left flange 13 arranged on the left side of the left energy gathering cover 14, a left middle flange 15 arranged between the left energy gathering cover 14 and the middle energy gathering cover 10, a right middle flange 16 arranged between the right energy gathering cover 7 and the middle energy gathering cover 10 and a sleeve 17;
the left energy concentrating cover 14 comprises a left concave outer surface 11 and a left concave inner surface 12, the left concave outer surface 11 and the left concave inner surface 12 are both paraboloids of revolution which are open outwards, and the paraboloids of revolution of the left concave inner surface 12 form a cavity; the left energy-gathering cover 14, the left flange 13 and the left middle flange 15 form a closed space, and explosives are arranged in the space; the above-mentionedThe maximum outer diameter of the left energy concentrating cover 14 is DaThe length of the left energy collecting cover 14 is La；
The right energy-gathering cover 7 comprises a right concave outer surface 5 and a right concave inner surface 6, the right concave outer surface 5 and the right concave inner surface 6 are both paraboloids of revolution which are opened outwards, and the paraboloids of revolution of the right concave inner surface 6 form a cavity; the right energy-gathering cover 7, the right flange 18 and the right middle flange 16 form a closed space, and explosive is arranged in the space; the maximum outer diameter of the right energy-gathering cover 7 is DbThe length of the right energy collecting cover 7 is Lb；
The central energy gathering cover 10 comprises a central concave outer surface 8 and a central concave inner surface 9, the central concave outer surface 8 and the central concave inner surface 9 are both rotary arc surfaces with outward openings, and the rotary arc surfaces of the central concave inner surface 9 form a cavity; the central energy collecting cover 10, the left middle flange 15 and the right middle flange 16 form a closed space, and explosive is arranged in the space; the maximum outer diameter of the middle energy gathering cover is DcThe length of the center energy collecting cover 10 is Lc；
The left middle flange 15 and the right middle flange 16 are both provided with sleeve holes, the outer part of the sleeve 17 is cylindrical, the inner part of the sleeve 17 is a cylindrical hole, the sleeve 17 sequentially penetrates through the cavity of the left concave inner surface 12, the sleeve hole of the left middle flange 15, the cavity of the middle concave inner surface 9, the sleeve hole of the right middle flange 16, the cavity of the right concave inner surface 6 and the through hole of the right flange 18, one end of the sleeve 17 is fixed on the right end surface of the left flange 13, and the other end of the sleeve 17 is fixed on the left end surface of the right flange 18;
a plurality of initiators 20 are arranged on the right surface of the left flange 13 and the left surface of the left middle flange 15 at intervals, the initiators 20 are connected with a ground control device through an initiation circuit 21 arranged in the sleeve 17, and the initiation of the initiators 20 is controlled through the ground control device;
a plurality of initiators 20 are arranged on the left surface of the right flange 18 and the right surface of the right middle flange 16 at intervals, the initiators 20 are connected with a ground control device through an initiation circuit 21 arranged in the sleeve 17, and the initiation of the initiators 20 is controlled through the ground control device;
a plurality of initiators 20 are arranged on the right surface of the left middle flange 15 and the left surface of the right middle flange 16 at intervals, the initiators 20 are connected with a ground control device through an initiation circuit 21 arranged in the sleeve 17, and the initiation of the initiators 20 is controlled through the ground control device.
The right side of the left flange 13 is provided with a left boss which is in an outwards convex spherical crown shape, and the convex height of the spherical crown shape of the left boss is HtThe diameter of the maximum opening part circle of the spherical crown shape of the left boss is Dt；
The left side of the right flange 18 is provided with a right boss which is in an outward convex spherical crown shape, and the convex height of the spherical crown shape of the right boss is HtThe diameter of the maximum opening part circle of the right boss spherical cap shape is Dt；
The left side of the left middle flange 15 is provided with a middle boss I, the middle boss I is in an outwards convex spherical crown shape, and the convex height of the spherical crown shape of the middle boss I is HtThe diameter of the maximum opening part circle of the spherical crown shape of the middle boss is Dt；
The right side of the left middle flange 15 is provided with a middle boss II, the middle boss II is in an outwards convex spherical crown shape, and the convex height of the spherical crown shape of the middle boss II is HtThe diameter of the maximum opening part circle of the spherical crown shape of the left, middle and right lug bosses is Dt；
The left side of the right middle flange 16 is provided with a middle boss III which is in a spherical crown shape protruding outwards, and the protruding height of the spherical crown shape of the middle boss III is HtThe diameter of the maximum opening part circle of the spherical crown shape of the middle boss III is Dt；
A middle boss IV is arranged on the right side of the right middle flange 16 and is in the shape of an outwards convex spherical crown, and the convex height of the shape of the spherical crown of the middle boss IV is HtThe diameter of the maximum opening part circle of the middle boss IV spherical crown shape is Dt；
The diameter DtIs the diameter D of explosive, the height HtIs 3 mm-8 mm.
Establishment of Oa-XaYaZaCoordinate system, Oa1-Xa1Ya1Za1Coordinate system, Oa2-Xa2Ya2Za2Coordinate system, Ob-XbYbZbCoordinate system, Ob1-Xb1Yb1Zb1Coordinate system, Ob2-Xb2Yb2Zb2Coordinate system and Oc-XcYcZcThe coordinate system is as follows:
Oa-XaYaZathe origin of coordinates of the coordinate system is on the axis of the left concentrator cap 14 and at the midpoint of the length of the left concentrator cap 14, XaAxis, YaAxis and ZaThe axes forming a right-handed rectangular coordinate system, XaThe axis coincides with the axis of the left energy concentrating cover 14, XaThe positive axial direction points from the left side of the left concentrator cap 14 to the right side of the left concentrator cap 14; x is the number ofa、yaAnd zaAre each XaAxis, YaAxis and ZaCoordinate variables of the axes;
Oa1-Xa1Ya1Za1the origin of coordinates of the coordinate system is Oa-XaYaZaIn the coordinate system is (-b)1,c1,0)，Xa1Axis, Ya1Axis and Za1The axes forming a right-handed rectangular coordinate system, Za1Axis and ZaAxis parallel, Xa1Axis and XaAngle of axis thetaa；xa1、ya1And za1Are each Xa1Axis, Ya1Axis and Za1Coordinate variables of the axes;
Oa2-Xa2Ya2Za2the origin of coordinates of the coordinate system is Oa-XaYaZaIn the coordinate system is (-b)2,c2,0)，Xa2Axis, Ya2Axis and Za2The axes forming a right-handed rectangular coordinate system, Za2Axis and ZaAxis parallel, Xa2Axis and XaAngle of axis thetaa；xa2、ya2And za2Are each Xa2Axis, Ya2Axis and Za2Coordinate variables of the axes;
Ob-XbYbZbthe origin of coordinates of the coordinate system is on the axis of the right energy concentrating cover 7 and at the midpoint of the length of the right energy concentrating cover 7, XbAxis, YbAxis and ZbThe axes forming a right-handed rectangular coordinate system, XbThe axis coincides with the axis of the right energy-collecting cover 7, XbThe positive axial direction points from the left side of the right energy gathering cover 7 to the right side of the right energy gathering cover 7; x is the number ofb、ybAnd zbAre each XbAxis, YbAxis and ZbCoordinate variables of the axes;
Ob1-Xb1Yb1Zb1the origin of coordinates of the coordinate system is Ob-XbYbZbIn the coordinate system is (b)1,c1,0)，Xb1Axis, Yb1Axis and Zb1The axes forming a right-handed rectangular coordinate system, Zb1Axis and ZbAxis parallel, Xb1Axis and XbAngle of axis thetab；xb1、yb1And zb1Are each Xb1Axis, Yb1Axis and Zb1Coordinate variables of the axes;
Ob2-Xb2Yb2Zb2the origin of coordinates of the coordinate system is Ob-XbYbZbIn the coordinate system is (b)2,c2,0)，Xb2Axis, Yb2Axis and Zb2The axes forming a right-handed rectangular coordinate system, Zb2Axis and ZbAxis parallel, Xb2Axis and XbAngle of axis thetab；xb2、yb2And zb2Are each Xb2Axis, Yb2Axis and Zb2Coordinate variables of the axes;
Oc-XcYcZcthe origin of coordinates of the coordinate system is on the axis of the said centre-concentrating dome 10 and at the midpoint of the length of the centre-concentrating dome 10, XcAxis, YcShaft andZcthe axes forming a right-handed rectangular coordinate system, XcThe axis coincides with the axis of the said central concentrating hood 10, XcThe positive axial direction points from the left side of the neutral energy concentrating cover 10 to the right side of the neutral energy concentrating cover 10; x is the number ofc、ycAnd zcAre each XcAxis, YcAxis and ZcCoordinate variables of the axes.
XaAxis, XbAxis and XcThe axes are collinear.
The rotation axis of the left concave outer surface 11 is XaA bus of the left concave outer surface 11 is a bus A which surrounds the XaThe axis rotation forms the left concave outer surface 11, the generatrix a being a parabola made up of the following system of equations:
the axis of rotation of the left concave inner surface 12 is XaA generatrix of the left concave inner surface 12 is a generatrix B which surrounds the XaThe axis of rotation forms the left concave inner surface 12, and the generatrix B is a parabola made up of the following system of equations:
the axis of rotation of the right concave outer surface 5 is XbA shaft, a bus of the right concave outer surface 5 is a bus C, and the bus C surrounds the XbThe axis rotation forms the right concave outer surface 5, the generatrix C being a parabola made up of the following system of equations:
the rotation axis of the right concave inner surface 6 is XbA generatrix of the right concave inner surface 6 is a generatrix D which surrounds the XbThe axis rotation forms the right concave inner surface 6, the generatrix D is a parabola made up of the following system of equations:
the axis of rotation of the concave outer surface 8 is XcA bus bar E of the concave outer surface 8 is a shaft and surrounds the XcThe shaft rotates to form the concave outer surface 8, the bus E is a section of circular arc, and the center of the circular arc is positioned at the charge length L of the central energy collecting cover 10cAnd is intermediate to said XcDistance of axis Lc1Radius of arc Rc1；
The axis of rotation of said concave inner surface 9 is XcA shaft, wherein a generatrix F is arranged on a 9 generatrix of the concave inner surface and surrounds the XcThe shaft rotates to form the concave inner surface 9, the generatrix F is a section of circular arc, the center of the circular arc is positioned at the charge length L of the central energy collecting cover 10cAnd is intermediate to said XcDistance of axis Lc2Radius of arc Rc2；
According to a known chord length LcAnd arch height Hc1、Hc2Radius R is determinedc1、Rc2Respectively to obtain Rc1、Rc2、Lc1And Lc2The calculation formula of (2):
Hc1and Hc2Are all arch height, Hc1Diameter of charge Dc0.1 to 0.4 times of (A), Hc2Diameter of charge Dc0.11 to 0.41 times of (A) and Hc2>Hc1。
In the above formulas:
Daand DbAre equal and are both D, LaAnd LbAre equal and are all L, thetaa＝-θ，θb＝θ；
D is 100 mm-800 mm, L is 200 mm-1000 mm, theta is 00～600；
DcIs 100 mm-800 mm, Lc200 mm-1000 mm;
h is the minimum wall thickness of the left energy gathering cover 14 and the right energy gathering cover 7, and H is 1 mm-10 mm;
a1、b1、c1、a2、b2、c2is a parameter, c10.2 to 0.90 times of D, c2C is 0.15 to 0.85 times of D1>c2；
The main parameters of the right energy concentrating mask 7 are determined below.
Parabolic cross-section of right concave outer surface 5
And
two points, namely: when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
after being put into equation set (13) to obtain:
solving the above equation set (17) to obtain a1、b1A value of1>0, to ensure the parabola opens outward, therefore, a is required1>0；
The minimum wall thickness of the right energy gathering cover 7 is H, and the right concave inner surface 6 of the right energy gathering cover 7 passes through the parabola
And
two points, namely: when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
after being put into equation set (14) to obtain:
solving the above equation set (18) to obtain a2、b2A value of2>0, to ensure the parabola opens outward, therefore, a is required2>0；
In this embodiment, θ is 450Then, there are: thetaa＝-450，θb＝450(ii) a Sin450＝cos450Then equation set (17) is transformed into equation set (19):
in equation set (19), P1、Q1The calculation formula is as follows:
P1＝D-L-2c1； (20)
Q1＝D+L-2c1； (21)
solving the system of equations (19), truncating b1<A solution of 0 to ensure that the parabola opens outward can be:
for the same reason, selecting theta as 450Then, there are: thetaa＝-450，θb＝450(ii) a Sin450＝cos450Then the system of equations (18) is transformed into the system of equations (23):
in equation set (23), P2、Q2The calculation formula is as follows:
P2＝D-L-2c2-2H； (24)
Q2＝D+L-2c2-2H； (25)
solving the system of equations (23), truncating b2<A solution of 0 to ensure that the parabola opens outward can be:
in this embodiment, each parameter or coefficient is specifically selected and solved as follows:
selecting: 300mm for D, 400mm for L, La＝400mm，Lb400mm, get c1Is 0.2 times of D, i.e. c160, take c2Is 0.15 times of D, namely c245, H2 mm, calculated from (22) and (26):
b1＝179.0724809、a1＝0.007938555；
b2＝184.116701、a2＝0.008717154。
the main parameters of the right concentrator cap 7 are determined above. The left energy collecting cover 14 and the right energy collecting cover 7 are in a left-right symmetrical relationship, so that main parameters of the left energy collecting cover 14 are determined accordingly.
The main parameters of the concentrator cap 10 are determined below.
In this embodiment, the following steps are selected: dcD is Dc＝300mm，LcL or LcH is 400mmc1Is Dc0.2 times of (i) Hc160mm, and Hc2Is Dc0.22 times of (H)c266mm and satisfies Hc2>Hc1Substituting equations (15), (15-1), (16) and (16-1), respectively, yields:
therefore, the technical scheme and the main parameters thereof of the embodiment are determined.
The above embodiments have better comprehensive energy-gathering effect.
According to the energy-gathering effect, after the explosive is exploded, the explosive product is basically scattered outwards along the normal direction of the surface of the explosive under high temperature and high pressure, so that after the explosive with the grooves is exploded, a strand of converged explosive with speed and intensity appears on the axes of the groovesPress and press High strengthThe high explosive product flow concentrates the explosive energy released by the explosive in a certain range. According to the inventionThe outer surface and the inner surface of the left energy-gathering cover 14, the middle energy-gathering cover 10 and the right energy-gathering cover 7 are respectively a paraboloid of revolution, the generatrix A, the generatrix B, the generatrix C and the generatrix D are all parabolas, and the rotating shaft of the paraboloid of revolution forms an included angle with the symmetrical axis of the parabola; the symmetrical axis of the parabola of the left energy-gathering cover rotates around the rotating shaft of the paraboloid of revolution to form a left conical surface, and the symmetrical axis of the parabola of the right energy-gathering cover rotates around the rotating shaft of the paraboloid of revolution to form a right conical surface; the outer surface and the inner surface of the central energy collecting cover are both rotary arc surfaces, and the circle center line of the arc of the central energy collecting cover rotates around the rotating shaft of the paraboloid of revolution to form a circle center line; due to the light characteristic of the parabola, namely, the light reflected by the focus is parallel to the symmetry axis of the parabola, the energy-gathering effect is further enhanced by the characteristic of the parabola; the circular arc also has the characteristic of energy accumulation towards the center of the circle, and the characteristic of the circular arc further enhances the energy accumulation effect; after the explosive is exploded, the explosion energy of the left energy-gathering cover 14 is gathered along the left conical surface and is ejected to the right in the space direction, the explosion energy of the right energy-gathering cover 7 is gathered along the right conical surface and is ejected to the left in the space direction, the explosion energy of the middle energy-gathering cover 10 is gathered and ejected to the space direction of the circle center line, the shale in an explosion fracturing area is extruded in three space directions simultaneously, cracks rapidly penetrate through to form a shale fracture zone in a shape like a Chinese character 'ji', the specific surface area of the shale is increased, and therefore the analysis rate and the recovery ratio of the shale gas are effectively increased. Meanwhile, due to the outward convex energy gathering effect of the spherical-crown-shaped left boss, the spherical-crown-shaped right boss, the spherical-crown-shaped middle boss I, the spherical-crown-shaped middle boss II, the spherical-crown-shaped middle boss III and the spherical-crown-shaped middle boss IV, the energy gathering effect is further enhanced.
To ensure that the wall thickness of the left energy concentrating cover 14 and the wall thickness of the right energy concentrating cover 7 are gradually reduced from the middle to the two sides, c is required1>c2(ii) a Similarly, to ensure that the wall thickness of the center-concentrating hood 10 is gradually reduced from the middle to both sides, H is requiredc2>Hc1。
Parameter c1、c2、Hc2、Hc1The value of (A) should be selected according to the properties of shale such as hardness, and the parameter c1、c2Smaller value of (A) and Hc2、Hc1The larger the value of (A), the more concentrated the explosive energy is, and the explosive fracturingThe deeper and narrower the zone, the longer the length of the shale crack; conversely, the more the explosion energy is converged and dispersed, the wider and shallower the explosion fracturing area is, and the shorter the length of the shale crack is. c. C10.2 to 0.90 times of D, c2C is 0.15 to 0.85 times of D1>c2；Hc1Diameter of charge Dc0.1 to 0.4 times of (A), Hc2Diameter of charge Dc0.11 to 0.41 times of (A) and Hc2>Hc1(ii) a Preferably: c. C1Is 0.2 to 0.6 times of D, c2C is 0.15 to 0.55 times of D1>c2，Hc1Diameter of charge Dc0.2 to 0.35 times of (C), Hc2Diameter of charge Dc0.22 to 0.36 times of (A) and Hc2>Hc1。
Selecting the value of a parameter theta according to the properties of the shale such as hardness and the like, wherein the larger the value of theta, the narrower the explosive fracturing area, the easier the shale is to crush, the shorter the length of shale cracks and the more the number of shale cracks; the smaller the value of theta, the wider the explosive fracturing zone, the less easily the shale is crushed, the longer the shale cracks are and the fewer the number of shale cracks are; theta is 00～600Preferably: theta is 300～500。
The left energy gathering cover 14, the middle energy gathering cover 10 and the right energy gathering cover 7 are all made of 7A09 type aluminum alloy, and the cost performance is the best.
The left flange 13, the left middle flange 15, the right middle flange 16 and the right flange 18 are all made of 4350 alloy steel, and the cost performance is the best.
The sleeve 17 is made of HP9-4-20 type high-temperature-resistant stainless steel pipes, and the cost performance is best.
The invention discloses a device for increasing shale gas recovery ratio by circular arc surface three-combination energy-gathering fracturing, wherein during manufacturing, explosives are put into an initiating device 20 in advance, and then the whole device is arranged in a shale gas well open hole 1; the initiator 20 comprises an electric detonator, a digital detonator and the like, and the initiation mode comprises electric initiation, digital initiation and the like; the explosive includes liquid explosive, solid explosive and the like.
The above embodiments are the main structural and shape parameters of the present invention, and the remaining structural details are designed and selected according to the common technical knowledge and the conventional technical means in the field of the present invention.
Claims (7)
1. A device for increasing shale gas recovery ratio by three-combination energy-gathering fracturing of an arc surface is arranged in an open hole of a shale gas well and comprises an initiation device and a gas conveying device, wherein the initiation device is used for cracking shale around the initiation device, the gas conveying device conveys shale gas seeped from the cracked shale to the ground, the initiation device comprises an initiation circuit and an initiator, and the gas conveying device comprises a right flange, an isolating device, an oil-gas pipe and a porous gas inlet pipe; the hole-shaped air inlet pipe is arranged between the isolating device and the right flange, one end of the hole-shaped air inlet pipe is arranged in the through hole of the right flange, and the other end of the hole-shaped air inlet pipe is arranged in the through hole on the isolating device; the porous air inlet pipe is a pipe with a plurality of air inlets, one end of the oil gas pipe is arranged in the through hole of the isolating device, and the other end of the oil gas pipe is connected with the ground gas collecting device; the detonating device is characterized by further comprising three combined energy collecting devices, wherein each three combined energy collecting device comprises a left energy collecting cover for collecting explosive explosion energy to be ejected rightwards, a right energy collecting cover for collecting explosive explosion energy to be ejected leftwards, a middle energy collecting cover for collecting explosive explosion energy to be ejected rightwards, a left flange arranged on the left side of the left energy collecting cover, a left middle flange arranged between the left energy collecting cover and the middle energy collecting cover, and a right middle flange and a sleeve arranged between the right energy collecting cover and the middle energy collecting cover;
the left energy-gathering cover comprises a left concave outer surface and a left concave inner surface, the left concave outer surface and the left concave inner surface are both paraboloids of revolution with outward openings, and the paraboloids of revolution of the left concave inner surface form a cavity; the left energy-gathering cover, the left flange and the left middle flange form a closed space, and explosive is arranged in the space; the maximum outer diameter of the left energy-gathering cover is DaThe length of the left energy collecting cover is La；
The right energy-gathering cover comprises a right concave outer surface and a right concave inner surface, the right concave outer surface and the right concave inner surface are both paraboloids of revolution with outward openings, and the paraboloid of revolution of the right concave inner surfaceForming a cavity; the right energy-gathering cover, the right flange and the right middle flange form a closed space, and explosive is arranged in the space; the maximum outer diameter of the right energy-gathering cover is DbThe length of the right energy-gathering cover is Lb；
The middle energy gathering cover comprises a middle concave outer surface and a middle concave inner surface, the middle concave outer surface and the middle concave inner surface are both rotary arc surfaces with outward openings, and the rotary arc surfaces of the middle concave inner surface form a cavity; the middle energy gathering cover, the left middle flange and the right middle flange form a closed space, and explosives are arranged in the space; the maximum outer diameter of the middle energy gathering cover is DcThe length of the center energy collecting cover is Lc；
The left middle flange and the right middle flange are respectively provided with a sleeve hole, the outer part of the sleeve is cylindrical, the inner part of the sleeve is a cylindrical hole, the sleeve sequentially penetrates through the cavity of the left concave inner surface, the sleeve hole of the left middle flange, the cavity of the middle concave inner surface, the sleeve hole of the right middle flange, the cavity of the right concave inner surface and the through hole of the right flange, one end of the sleeve is fixed on the right end face of the left flange, and the other end of the sleeve is fixed on the left end face of the right flange;
the right side of the left flange is provided with a left boss which is in an outwards convex spherical crown shape, and the convex height of the spherical crown shape of the left boss is HtThe diameter of the maximum opening part circle of the spherical crown shape of the left boss is Dt；
The left side of right flange is provided with right boss, right boss is outside bellied spherical crown shape, the protruding height of right boss spherical crown shape is HtThe diameter of the maximum opening part circle of the right boss spherical cap shape is Dt；
The left side of the left middle flange is provided with a middle boss I, the middle boss I is in an outwards convex spherical crown shape, and the convex height of the spherical crown shape of the middle boss I is HtThe diameter of the maximum opening part circle of the spherical crown shape of the middle boss is Dt；
The right side of the left middle flange is provided with a middle boss II which is outwards convexThe convex height of the spherical crown shape of the middle boss II is HtThe diameter of the maximum opening part circle of the spherical crown shape of the left middle boss is Dt；
The left side of the right middle flange is provided with a middle boss III, the middle boss III is in a spherical crown shape protruding outwards, and the protruding height of the spherical crown shape of the middle boss III is HtThe diameter of the maximum opening part circle of the spherical crown shape of the middle boss III is Dt；
A middle boss IV is arranged on the right side of the right middle flange, the middle boss IV is in a spherical crown shape protruding outwards, and the protruding height of the spherical crown shape of the middle boss IV is HtThe diameter of the maximum opening part circle of the middle boss IV spherical crown shape is Dt；
The diameter DtIs the diameter D of explosive, the height Ht3mm to 8 mm;
the rotation axis of the left concave outer surface is XaA shaft, the bus of the left concave outer surface is a bus A which surrounds the XaThe axis rotation forms the left concave outer surface, and the generatrix A is a parabola formed by the following equation set:
the rotation axis of the left concave inner surface is XaA shaft, a bus of the left concave inner surface is a bus B, and the bus B surrounds the XaThe axis of rotation forming the left concave inner surface, the generatrix B being a parabola formed by the following system of equations:
the rotating axis of the right concave outer surface is XbA shaft, a bus of the right concave outer surface is a bus C, and the bus C surrounds the XbThe axis of rotation forming the right concave outer surface, the generatrix C being a parabola formed by the following system of equations:
the rotation axis of the right concave inner surface is XbA shaft, a bus of the right concave inner surface is a bus D which is wound around the XbThe axis of rotation forming the right concave inner surface, the generatrix D being a parabola formed by the following system of equations:
the rotation axis of the concave outer surface is XcA shaft, a bus bar of the concave outer surface is a bus bar E, and the bus bar E surrounds the XcThe shaft rotates to form the concave outer surface, the bus E is a section of circular arc, the center of the circular arc is positioned at the charge length L of the central energy collecting covercAnd is intermediate to said XcDistance of axis Lc1Radius of arc Rc1；
The rotation axis of the concave inner surface is XcA shaft, a generatrix of the concave inner surface is a generatrix F which is wound around the XcThe shaft rotates to form the concave inner surface, the bus F is a section of circular arc, the center of the circular arc is positioned at the charge length L of the central energy collecting covercAnd is intermediate to said XcDistance of axis Lc2Radius of arc Rc2；
In the above formulas:
Oa-XaYaZathe origin of coordinates of the coordinate system is on the axis of the left energy concentrating cover and at the midpoint of the length of the left energy concentrating cover, XaAxis, YaAxis and ZaThe axes forming a right-handed rectangular coordinate system, XaThe axis of the shaft coincides with the axis of the left energy-gathering cover, XaThe positive axial direction points from the left side of the left energy-gathering cover to the right side of the left energy-gathering cover; x is the number ofa、yaAnd zaAre each XaAxis, YaAxis and ZaCoordinate variables of the axes;
Oa1-Xa1Ya1Za1the origin of coordinates of the coordinate system is Oa-XaYaZaIn the coordinate system is (-b)1,c1,0)，Xa1Axis, Ya1Axis and Za1The axes forming a right-handed rectangular coordinate system, Za1Axis and ZaAxis parallel, Xa1Axis and XaAngle of axis thetaa；xa1、ya1And za1Are each Xa1Axis, Ya1Axis and Za1Coordinate variables of the axes;
Oa2-Xa2Ya2Za2the origin of coordinates of the coordinate system is Oa-XaYaZaIn the coordinate system is (-b)2,c2,0)，Xa2Axis, Ya2Axis and Za2The axes forming a right-handed rectangular coordinate system, Za2Axis and ZaAxis parallel, Xa2Axis and XaAngle of axis thetaa；xa2、ya2And za2Are each Xa2Axis, Ya2Axis and Za2Coordinate variables of the axes;
Ob-XbYbZbthe origin of coordinates of the coordinate system is on the axis of the right energy concentrating cover and at the midpoint of the length of the right energy concentrating cover, XbAxis, YbAxis and ZbThe axes forming a right-handed rectangular coordinate system, XbThe axis of the shaft coincides with the axis of the right energy-gathering cover, XbThe positive axial direction points from the left side of the right energy gathering cover to the right side of the right energy gathering cover; x is the number ofb、ybAnd zbAre each XbAxis, YbAxis and ZbCoordinate variables of the axes;
Ob1-Xb1Yb1Zb1the origin of coordinates of the coordinate system is Ob-XbYbZbIn the coordinate system is (b)1,c1,0)，Xb1Axis, Yb1Axis and Zb1The axes forming a right-handed rectangular coordinate system, Zb1Axis and ZbAxis parallel, Xb1Axis and XbAngle of axis thetab；xb1、yb1And zb1Are each Xb1Axis, Yb1Axis and Zb1Coordinate variables of the axes;
Ob2-Xb2Yb2Zb2the origin of coordinates of the coordinate system is Ob-XbYbZbIn the coordinate system is (b)2,c2,0)，Xb2Axis, Yb2Axis and Zb2The axes forming a right-handed rectangular coordinate system, Zb2Axis and ZbAxis parallel, Xb2Axis and XbAngle of axis thetab；xb2、yb2And zb2Are each Xb2Axis, Yb2Axis and Zb2Coordinate variables of the axes;
Oc-XcYcZcthe origin of coordinates of the coordinate system is on the axis of the said centre-concentrating mantle and at the midpoint of the length of the centre-concentrating mantle, XcAxis, YcAxis and ZcThe axes forming a right-handed rectangular coordinate system, XcThe axis of the shaft coincides with the axis of the central energy collecting cover, XcThe positive direction of the axis points to the right side of the central energy gathering cover from the left side of the central energy gathering cover; x is the number ofc、ycAnd zcAre each XcAxis, YcAxis and ZcCoordinate variables of the axes;
Xaaxis, XbAxis and XcThe axes are collinear;
Daand DbAre equal and are both D, LaAnd LbAre equal and are all L, thetaa＝-θ，θb＝θ；
D is 100 mm-800 mm, L is 200 mm-1000 mm, theta is 30-50 degrees;
Dcis 100 mm-800 mm, Lc200 mm-1000 mm;
h is the minimum wall thickness of the left energy-gathering cover and the right energy-gathering cover, and H is 1 mm-10 mm;
a1、b1、c1、a2、b2、c2is a parameter, c10.2 to 0.90 times of D, c2C is 0.15 to 0.85 times of D1>c2；
Solving the following system of equations to obtain a1、b1A value of1>0：
Solving the following system of equations to obtain a2、b2A value of2>0：
Rc1、Rc2、Lc1And Lc2Respectively according to the following formula:
Hc1and Hc2Are all arch height, Hc1Diameter of charge Dc0.1 to 0.4 times of (A), Hc2Diameter of charge Dc0.11 to 0.41 times of (A) and Hc2>Hc1。
2. The device for increasing shale gas recovery rate through three-combination circular-arc-surface energy-gathering fracturing as claimed in claim 1, wherein the parameter theta is 45 degrees, and the parameter a is1、b1、a2、b2Calculated sequentially by the following formula:
P1＝D-L-2c1；
Q1＝D+L-2c1；
P2＝D-L-2c2-2H；
Q2＝D+L-2c2-2H；
3. the device for increasing shale gas recovery rate through three-combination circular-arc-surface energy-gathering fracturing according to claim 1 or 2, wherein the arch height H isc1Diameter of charge Dc0.2 to 0.35 times of (C), Hc2Diameter of charge Dc0.21 to 0.36 times of (A) and Hc2>Hc1。
4. The device for increasing shale gas recovery rate through three-combination circular-arc-surface energy-gathering fracturing according to claim 1 or 2, wherein the parameter D isc200 mm-500 mm, Lc300 mm-600 mm.
5. The device for increasing the recovery rate of shale gas by three-combination energy-gathering fracturing of the arc surfaces according to claim 1 or 2, wherein the radial minimum wall thickness H is 1 mm-5 mm.
6. The device for increasing shale gas recovery rate through three-combination circular-arc-surface energy-gathering fracturing as claimed in claim 1 or 2, wherein the parameter D is 200 mm-500 mm, the parameter L is 300 mm-600 mm, and the parameter c is1Is 0.2 to 0.6 times of D, c2C is 0.15 to 0.55 times of D1>c2。
7. The apparatus for increasing shale gas recovery rate by three-combination circular-arc-surface energy-gathering fracturing as claimed in claim 2, wherein the parameter D is 300mm, L is 400mm, and L isa＝400mm，Lb＝400mm，c1＝60，c2＝45，H＝2mm，b1＝179.0724809，a1＝0.007938555，b2＝184.116701，a2＝0.008717154；
Dc＝300mm，Lc＝400mm，Hc1＝60mm，Hc2＝66mm，Rc1＝363.333mm，Lc1＝453.333mm，Rc2＝336.030mm，Lc2＝420.030mm。
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