CN115030693A - Multi-pulse high-energy gas fracturing bomb with built-in segmented explosive columns - Google Patents

Abstract

The invention relates to the technical field of oil and gas well exploitation, in particular to a multi-pulse high-energy gas fracturing bomb with built-in segmented explosive columns, which comprises a partition plate igniter, a plurality of bomb bodies, an anti-impact disc connector and an anti-impact disc which are sequentially connected; a plurality of pressure relief holes are formed in the circumferential side wall of the bomb body, a central ignition tube is axially arranged in the center of the bomb body, a paste high-energy material grain is filled in an annular cavity formed between the bomb body and the central ignition tube, and ignition powder is filled in the central ignition tube; and two adjacent elastic bodies are connected through a double male connector, and a middle bulge part with the outer diameter larger than that of the elastic bodies is arranged in the middle of the double male connector. The fracturing bomb realizes the customized management of a multi-pulse energy output mode in the fracturing process, can generate shock waves in a characteristic frequency band to be loaded on a stratum, enables a near-wellbore area to form a plurality of radial fracture groups which are not controlled by ground stress, and achieves the effects of volume transformation, stability and high-efficiency output of oil and gas well exploitation and old well activation.

Description

Multi-pulse high-energy gas fracturing bomb with built-in segmented explosive columns

Technical Field

The invention relates to the technical field of oil and gas well exploitation, in particular to a multi-pulse high-energy gas fracturing bomb with built-in segmented explosive columns.

Background

Since the beginning of the century, the technology of the built-in full-charge composite high-energy material fracturing gun represented by GasGun is popularized on a large scale in the exploitation of foreign oil and gas wells. The technology realizes that the single well mining radius, daily output and stable production period are greatly increased, the total recovery rate reaches 50 percent, and the cost is reduced 2/3; the reservoir transformation effect generates qualitative leap; meanwhile, the method has the advantages of safe use, simple and convenient construction and the like. Has achieved great success in the aspects of old well activation and low-hole and low-permeability well reconstruction. After the advanced fracturing technology is adopted in the United states on a large scale, the daily increase of the oil yield is frequently innovative, the complete self-supply of the oil is realized in 2019, and the prohibition of oil export is removed for the first time. The petroleum produced by the advanced fracturing technology accounts for more than 50 percent of the petroleum yield of America, and GasGun implements technical blocking on China due to the fact that the GasGun relates to core military technologies such as solid high-energy materials and the like.

The existing reservoir exploitation and modification technology in China applies hydraulic fracturing on a large scale, a plurality of radial long-distance radial cracks cannot be formed in a near wellbore area due to the influence of ground stress in the implementation process of the process, and stratum dislocation is very small in the hydraulic fracturing process, so that the cracks are difficult to support for a long time, and stratum seepage capability is extremely limited.

The fracturing technologies related to the composite high-energy materials which are partially tried in recent years are mostly naked-medicine external shell-free fracturing bullets, and the technical problems of unsafe construction, uncontrollable combustion, unobvious effect and the like exist. Also be equipped with in the fracturing gun at present and improve the security in the fracturing gun body, like the multistage compound deep penetration perforating device that publication number is disclosed for CN203285405U, including at least one whole perforation unit, whole perforation includes fracturing gun subassembly and compound perforator, and the fracturing gun subassembly includes that from the top down is fixed connection's cylindric top connection, cylindric fracturing gun body and cylindric intermediate head in proper order, and the fracturing gun body is equipped with the fracturing powder column, and the lateral wall of fracturing gun body is equipped with a plurality of pressure release holes. When a pore passage is formed by perforating and ejecting pores in the composite perforator, two-stage gunpowder stimulates combustion step by step, high-temperature and high-pressure gas is generated in a shaft and directly enters the perforating pore passage, the pressure action time is greatly prolonged by doing work for many times, and effective gas fracturing can be performed on a thinner unconventional oil-gas layer, so that pore-joint-type deep penetration is formed, and the flow conductivity of a near-wellbore area is improved.

Disclosure of Invention

In order to solve the problem of low construction safety of the naked-chemical external shell-free fracturing bomb in the prior art, the invention provides a multi-pulse high-energy gas fracturing bomb with built-in sectional explosive columns, which is mainly characterized in that the special high-energy material explosive columns are built in the fracturing bomb in sections, so that the customized management of a multi-pulse energy output mode in the fracturing process is realized, on the premise of ensuring the construction safety, shock waves with characteristic frequency ranges are generated and loaded on a stratum, a plurality of radial crack groups which are not controlled by ground stress are formed in a near-well area, and the effects of volume modification and stable and high-efficiency output of oil-gas well exploitation and old well activation are achieved, so that the problems that the fracturing effect of single fracturing in the prior art is low, radial long-distance network radial cracks cannot be formed, and the stratum seepage capacity is limited are overcome; uncontrollable combustion, unsafe construction and high operation cost.

The invention provides a multi-pulse high-energy gas fracturing bomb with a built-in segmented explosive column, which specifically comprises a partition plate igniter, a plurality of bomb bodies, an anti-impact disc connector and an anti-impact disc, wherein the partition plate igniter, the bomb bodies, the anti-impact disc connector and the anti-impact disc are sequentially and axially connected;

the projectile body is characterized in that a plurality of pressure relief holes are formed in the circumferential side wall of the projectile body, a central ignition tube is axially arranged in the center of the projectile body, an annular cavity formed between the projectile body and the central ignition tube is filled with a high-energy paste material charge column, and an ignition charge with a burning speed higher than that of the high-energy paste material charge column is filled in the central ignition tube;

an initiator for igniting the high-energy material charge column of the paste and the ignition charge is arranged in the partition igniter;

and two adjacent projectiles are connected through a double male connector, and a middle bulge part with the outer diameter larger than that of the projectile body is arranged in the middle of the double male connector.

In one embodiment, the pressure relief hole is a through hole, or a step through hole provided with a blocking piece.

In an embodiment, the baffle igniter further comprises a baffle joint in threaded connection with the projectile body, and a cavity for placing the initiator, a gland for fixing the initiator and a clamp are arranged in the baffle joint.

In one embodiment, the casing of the high-energy paste material grain is made of a fluoroplastic tube material.

In one embodiment, a plurality of waist-shaped holes distributed along the axial direction are formed in the circumferential side wall of the central ignition tube, brackets are sleeved at two ends of the central ignition tube, and at least more than two supports distributed along the radial direction are arranged on the brackets.

In one embodiment, the peripheries of both sides of the middle bulge part are provided with chamfers.

In one embodiment, the outer surface of the intermediate boss is knurled.

In an embodiment, scour protection dish connects one end and links to each other with the elastomer for the external screw thread, and the other end is that the internal thread links to each other with the scour protection dish, and the external diameter of the internal thread end that the scour protection dish connects with the diameter of middle bellying is the same.

In one embodiment, the impingement plate comprises a connecting rod, and a threaded connector, a proximal plate, a plurality of intermediate plates and a distal plate which are connected in sequence through the connecting rod;

the anti-impact disc connector is connected with the anti-impact disc through the anti-impact disc, the near-end disc is closest to the anti-impact disc connector, the far-end disc is farthest to the anti-impact disc connector, and the diameter of the far-end disc is smaller than that of the near-end disc and that of the middle disc.

In one embodiment, the peripheries of the proximal disc, the middle disc and the distal disc are provided with chamfers, and the side length of each chamfer is not less than 12 mm.

Based on the above, compared with the prior art, the multi-pulse high-energy gas fracturing bomb with the built-in segmented explosive columns provided by the invention has the following technical effects:

1. the sectional explosive columns can be directly loaded into the projectile body on site without being assembled in a special site in advance, and the safety requirement of the separated transportation of the projectiles and the explosive in the whole process is met.

2. The special partition plate igniter is adopted, the igniter is independently sealed during assembly, high-temperature and high-speed metal jet flow is output after excitation, ignition of the explosive column in air or water medium can be realized, the pressure condition of the ultra-deep well is adapted, and the technical effect of safe and reliable ignition is effectively realized.

3. After the center of the explosive column is penetrated and ignited, the explosive column starts to burn from a newly formed inner hole, the burning area is gradually increased, high-energy gas can be supplied at high speed and is matched with the gas quantity required by the extension of a formation crack, the effective pressure maintaining time of a shaft is prolonged, and the crack forming distance is longer.

4. The paste high-energy material is arranged in multiple sections, so that the change rule of the stratum temperature can be ingeniously utilized, the peak pressure output in a shaft rises linearly along with the increase of the operation depth, and the paste high-energy material is automatically matched with the fracture pressures of the stratums at different depths.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts; in the following description, the drawings are illustrated in a schematic view, and the drawings are not intended to limit the present invention.

FIG. 1 is a schematic structural diagram of a multi-pulse high-energy gas fracturing bomb with a built-in segmented charge;

FIG. 2 is a schematic view of a baffle igniter configuration;

FIG. 2.1 is a schematic structural view of a separator plate joint;

FIG. 2.2 is a schematic view of the structure of the clamp;

FIG. 2.3 is a schematic view of the gland structure

FIG. 2.4 is a schematic axial projection of the gland of FIG. 2.3;

FIG. 3 is a schematic diagram of the structure of the projectile body;

FIG. 3.1 is a cross-sectional view taken along A-A of FIG. 3;

FIG. 4 is a schematic view of a blade structure;

FIG. 5 is a schematic diagram of a center point fire tube configuration;

FIG. 5.1 is an axial projection view of the center spot fire tube of FIG. 5;

FIG. 6 is a schematic structural view of a dual male connector;

FIG. 7 is a schematic view of a structure of an impingement plate joint;

figure 8 is a schematic view of an impingement plate configuration.

Reference numerals:

100 baffle igniter 101 detonator 110 baffle joint

120 gland 121 mounting hole 130 anchor clamps

200 elastomer 201 pressure relief hole 202 blocking piece

220 center squib 221 bracket 221a support

230 ignition charge 210 paste high-energy material grain 400 impingement plate joint

300 double male connector 310 middle boss 311 mounting hole

500 prevent dashing 501 connecting rod 510 threaded connection head of dish

520 proximal disc 530 intermediate disc 540 distal disc

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; the technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, and should not be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Referring to fig. 1, the present invention provides an embodiment of a multi-pulse high-energy gas fracturing bomb with a built-in segmented charge, which comprises a partition igniter 100, a plurality of projectiles 200, a scour protection disk joint 400 and a scour protection disk 500, which are axially connected in sequence, and the overall shape of the components is approximately hollow cylindrical or tubular. Specifically, threaded connections are adopted between the partition igniter 100 and the projectile body 200, between the projectile body 200 and the impingement plate connector 400, and between the impingement plate connector 400 and the impingement plate 500, and it should be noted that O-rings are installed at positions to be sealed.

The blank of the bullet 200 adopts a perforating gun barrel of oil field industry standard, and can bear impulse type internal pressure of more than 380MPa after the toughness is improved through heat treatment. A central fire tube 220 is axially disposed at the center of the body 200, and a circular cavity formed between the body 200 and the central fire tube 220 is filled with a paste energetic material column 210, and generally, the length of the central fire tube 220 is the same as the length of the corresponding paste energetic material column 210. Specifically, the outer shell of the high energy paste material cartridge 210 and the central ignition tube 220 are both made of thin-walled fluoroplastic tubes.

The ignition powder 230 with burning speed higher than that of the high-energy material powder column of the paste is filled in the central fire tube 220; specifically, the ignition charge 230 is located in the central fire tube 220 and is located in the center of the paste energetic material charge 210, and the ignition charge 230 is rectangular or cylindrical and is formed by connecting a plurality of charges into a long shape or an integral shape.

Referring to fig. 3, the circumferential side wall of projectile body 200 is equipped with a plurality of pressure release holes 201 as the main output channel of shock wave, and preferably, a plurality of pressure release holes 201 are two bisymmetry and axial equidistance distribution, and projectile body 200 adopts the mode of symmetry trompil, can effectively eliminate the displacement by a wide margin of horizontal hunting, effectively avoids instrument or sleeve pipe to take place the damage.

Specifically, referring to fig. 3.1 and 4, the pressure relief hole 201 may be a through hole, or a step through hole provided with a blocking piece 202, wherein the step through hole provided with the blocking piece 202 is preferred, and an O-ring seal is adopted between the blocking piece 202 and the elastomer 200.

The length of the assembled fracturing bomb is determined by the number of the bomb 200, and generally the number of the bomb 200 is determined by the length of the work task section. Two adjacent projectile bodies 200 are connected through a double male connector 300, the double male connector 300 is of a hollow structure and is used for transmitting fire between the two connected projectile bodies 200 to enable the high-energy material columns 210 of the paste to be sequentially burnt backwards, and the material of the double male connector 300 is the same as that of the projectile bodies 200.

Similarly, the body 200 is threaded into the dual pin 300 and sealed with an O-ring.

Referring to fig. 6, the middle of the dual male connector 300 is further provided with a middle protrusion 310 having an outer diameter larger than that of the projectile body 200, so that a certain gap is maintained between the projectile body 200 and a casing wall during a downhole process, the projectile body 200 is prevented from being scratched or the plug 202 is prevented from being scraped, and the safety performance of construction is improved.

The separator igniter 100 is internally provided with an initiator 101 for igniting a high-energy material charge 210 and an ignition charge 230 of a paste, and the specific working principle is as follows:

after the initiator 101 contained in the baffle igniter 100 is excited, the high-temperature metal jet flow axially output ignites the explosive column 210 of the paste energetic material and the ignition charge 230. Because the ignition powder 6 is fast in burning speed, the center of the high-energy material grain 210 of the paste body is subjected to penetrating ignition, the high-energy material grain 210 of the paste body is subjected to radial surface-increasing combustion in a newly generated inner hole, generated gas rapidly expands towards a shaft sleeve along a pressure relief hole 201 on the projectile body 200, and shock waves are generated to act on a reservoir stratum to form a radial volume fracture group. Part of the shock waves are reflected for multiple times in the casing, and a multi-pulse effect is generated after random strengthening and weakening, so that the seam forming effect of the reservoir is strengthened. Meanwhile, when the paste high-energy material grain 210 is subjected to surface increasing combustion, the output high-energy gas quantity is gradually increased and matched with the accelerated gas consumption in the crack extension process, the effective pressure maintaining time of a shaft is prolonged, and the crack extension distance is longer and can reach more than 30 meters.

In one embodiment, as shown in fig. 2 to 2.4, the bulkhead igniter 100 further comprises a bulkhead adaptor 110 in threaded connection with the projectile 200, a cavity for placing the initiator 101 is arranged in the bulkhead adaptor 110, a gland 120 is used for fixing the end of the initiator 101 far away from the projectile 200, and a clamp 130 is used for fixing part of the circumferential side wall of the initiator 101, the initiator 101 outputs a metal jet axially after being excited, penetrates through the bulkhead adaptor 110 close to the bottom end face of the projectile 200, and ignites the energetic material charge 210 and the ignition charge 230; wherein, the clamp 130 is provided with an external thread matching with the internal thread of the partition joint 110, as shown in fig. 2.4, the gland 120 is provided with a mounting hole 121 for fixing an assembly tool.

Preferably, as shown in FIG. 2.2, the clamp 130 side walls are uniformly perforated for attenuating the effects of detonation waves during operation.

Preferably, referring to fig. 5, a plurality of axially-distributed waist-shaped holes are formed in the circumferential side wall of the central fire tube 220, and preferably, the waist-shaped holes are equidistantly and alternately distributed, so that the ignition powder 230 can transfer flame to the paste energetic material powder column 210 when working.

Referring to fig. 5.1, two ends of the center fire tube 220 are further sleeved with brackets 221, which can be fixed by riveting, welding or gluing. At least more than two supports 221a distributed along the radial direction are arranged on the support 221, as shown in the embodiment shown in fig. 5.1, the number of the supports 221a is 4, and the support 221 is mainly used for positioning the central point fire tube 220 at the center position inside the projectile body 200 to play a limiting role, so that the ignition charge 230 is ignited at the center of the high-energy material charge 210 of the pasty body.

Preferably, as shown in fig. 6, chamfers with an angle B are disposed on both sides of the middle protrusion 310, so as to prevent the fracturing bomb from being stuck by a damaged sleeve during the downward entering and upward lifting processes, thereby further ensuring the construction safety.

In some embodiments, the middle protrusion 310 further has a plurality of mounting holes 311 for fixing a special tool during assembly.

Preferably, the outer surface of the middle protrusion 310 is knurled to increase friction during installation.

In one embodiment, as shown in fig. 7, the impingement plate connector 400 has an external thread at one end for connecting to the projectile body 200 and an internal thread at the other end for connecting to the impingement plate 500, and the external diameter of the internal thread end of the impingement plate connector 400 is the same as the diameter of the middle protrusion 310.

Preferably, the outer surface of the internally threaded end of the anti-impingement plate joint 400 is also knurled, and an end face with a distance D is machined at the same time for fixing with a special installation tool. The part close to the projectile body 200 is also provided with a chamfer with an angle E, so that the fracturing projectile is prevented from being clamped by a damaged sleeve in the processes of descending and lifting.

Preferably, with reference to fig. 8, the anti-shock disc 500 comprises a connecting rod 501, and a threaded connector 510, a proximal disc 520, several intermediate discs 530 and a distal disc 540, connected in turn by the connecting rod 501; the impact prevention disc 500 may be integrally formed or may be formed in a segmented manner and then assembled by welding, screwing, or the like, and may be made of the same material as the body 200.

The near-end disc 520, the plurality of intermediate discs 530 and the far-end disc 540 are used as structural members for mainly bearing impact force in the anti-impact disc 500, the anti-impact disc 500 designed as above is arranged at the tail part of the fracturing bomb, so that the large-amplitude displacement of longitudinal swing can be effectively eliminated, and tools or sleeves are effectively prevented from being damaged.

The proximal disc 520 is closest to the impingement plate connector 400, the distal disc 540 is farthest from the impingement plate connector 400, the diameter of the distal disc 540 is smaller than that of the proximal disc 520 and smaller than that of the intermediate discs 530, and the diameters of all the intermediate discs 530 are equal, so that the cushioning effect of the impingement plate 500 can be fully exerted. The number of the intermediate disks 530 of the embodiment shown in fig. 8 is 2, but is not limited thereto.

Preferably, the peripheries of the proximal disc 520, the middle disc 530 and the distal disc 540 are all provided with chamfers, particularly chamfers of 90 degrees, and the side length of each chamfer is not less than 12mm, so that the fracturing bomb is effectively prevented from being hung and clamped.

The O-shaped rings used for sealing are made of high-hardness and high-temperature-resistant fluororubber materials, and can be used at the depth of 7500 meters underground.

In summary, compared with the prior art, the multi-pulse high-energy gas fracturing bomb with the built-in segmented explosive columns provided by the invention has the following technical effects:

1. the high-energy material of the paste is placed in the fracturing bomb in sections, the center is ignited to realize the surface-increasing combustion of the explosive column, and the output high-energy gas quantity is gradually increased and matched with the gas accelerated consumption in the crack extension process. The modularized segmented explosive columns realize the separation and transportation of the ammunition and the explosive, are easy to assemble on site and are safe to construct in the well. The multi-pulse working mode applies shock waves of a characteristic frequency range to the stratum, the crack extension distance can reach 30m or even longer, and the technical effect of generating radial crack groups in a near-well area is achieved.

2. By adopting the special partition plate igniter, the ignition device is independently sealed during assembly, outputs high-temperature and high-speed metal jet after excitation, can realize ignition of explosive columns in air or water medium, adapts to the pressure condition of ultra-deep wells, and effectively realizes the technical effect of safe and reliable ignition.

3. Preferably, a stepped hole and blocking piece unidirectional pressure-bearing sealing technology is adopted, so that the technical effects of isolating high-energy materials from well fluid and synchronously solving the problem of overpressure inside the bomb body after ignition are effectively realized.

4. The bullet body symmetry trompil and installation afterbody anti-impact disc are preferably adopted, have effectively eliminated horizontal oscillation and vertically upwards displacement by a wide margin, avoid instrument and sleeve pipe damage to take place the technological effect.

In addition, it will be appreciated by those skilled in the art that, although there may be many problems with the prior art, each embodiment or aspect of the present invention may be improved only in one or several respects, without necessarily simultaneously solving all the technical problems listed in the prior art or in the background. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.

Although terms such as bulkhead igniters, detonators, bulkhead connectors, glands, mounting holes, clamps, projectiles, pressure relief holes, plugs, center squibs, supports, struts, ignition charges, columns of high energy material paste, double male connectors, lobes, mounting holes, anti-flush disc connectors, anti-flush discs, connecting rods, threaded connectors, proximal discs, intermediate discs, distal discs, etc., are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention; the terms "first," "second," and the like in the description and in the claims, and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a built-in many pulse high energy gas fracturing bullets of segmentation grain which characterized in that: comprises a clapboard igniter (100), a plurality of elastic bodies (200), an anti-impact disc joint (400) and an anti-impact disc (500) which are axially connected in sequence;

a plurality of pressure relief holes (201) are formed in the circumferential side wall of the projectile body (200), a central ignition tube (220) is axially arranged in the center of the projectile body (200), an annular cavity formed between the projectile body (200) and the central ignition tube (220) is filled with a paste high-energy material grain (210), and an ignition charge (230) with the burning rate larger than that of the paste high-energy material grain is filled in the central ignition tube (220);

an initiator (101) used for igniting a paste high-energy material grain (210) and an ignition charge (230) is arranged in the partition igniter (100);

the two adjacent projectile bodies (200) are connected through a double male connector (300), and a middle bulge (310) with the outer diameter larger than that of the projectile body (200) is arranged in the middle of the double male connector (300).

2. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: the pressure relief hole (201) is a through hole, or a step through hole provided with a blocking piece (202).

3. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: the baffle igniter (100) further comprises a baffle joint (110) in threaded connection with the projectile body (200), and a cavity for placing the initiator (101), a gland (120) for fixing the initiator (101) and a clamp (130) are arranged in the baffle joint (110).

4. The multi-pulse high-energy gas fracturing bomb with a built-in segmented explosive column according to claim 1, wherein: the shell of the paste high-energy material grain (210) is made of a fluoroplastic pipe.

5. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: the central ignition tube is characterized in that a plurality of waist-shaped holes distributed along the axial direction are formed in the circumferential side wall of the central ignition tube (220), supports (221) are further sleeved at two ends of the central ignition tube (220), and at least more than two support columns (221a) distributed along the radial direction are arranged on the supports (221).

6. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: the peripheries of two sides of the middle bulge part (310) are provided with chamfers.

7. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: the outer surface of the middle bulge part (310) is provided with knurls.

8. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: scour protection dish connects (400) one end and links to each other with projectile (200) for the external screw thread, and the other end is that the internal thread links to each other with scour protection dish (500), and the external diameter of the internal thread end of scour protection dish connects (400) with the diameter of middle bellying (310) is the same.

9. The multi-pulse high-energy gas fracturing bomb with built-in segmented explosive column according to claim 1, characterized in that: the anti-flushing disc (500) comprises a connecting rod (501), and a threaded connector (510), a near-end disc (520), a plurality of intermediate discs (530) and a far-end disc (540) which are connected in sequence through the connecting rod (501);

wherein the proximal disc (520) is closest to the erosion shield disc joint (400), the distal disc (540) is furthest from the erosion shield disc joint (400), and the diameter of the distal disc (540) is smaller than the diameter of the proximal disc (520) and the diameter of the intermediate disc (530).

10. The multi-pulse high-energy gas fracturing bomb with built-in segmented charge of claim 9, wherein: the peripheries of the near-end disc (520), the middle disc (530) and the far-end disc (540) are provided with chamfers, and the side length of each chamfer is not less than 12 mm.

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