CN115030693B - Multi-pulse high-energy gas fracturing bomb with built-in segmented grain - Google Patents
Multi-pulse high-energy gas fracturing bomb with built-in segmented grain Download PDFInfo
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- CN115030693B CN115030693B CN202210482139.9A CN202210482139A CN115030693B CN 115030693 B CN115030693 B CN 115030693B CN 202210482139 A CN202210482139 A CN 202210482139A CN 115030693 B CN115030693 B CN 115030693B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/117—Shaped-charge perforators
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/1185—Ignition systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
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 a built-in segmented grain, which comprises a baffle igniter, a plurality of bombs, a shock-resistant disc connector and a shock-resistant disc which are connected in sequence; the circumferential side wall of the projectile body is provided with a plurality of pressure relief holes, the center of the projectile body is axially provided with a center ignition tube, an annular cavity formed between the projectile body and the center ignition tube is filled with a high-energy material grain of the projectile body, and the center ignition tube is filled with ignition powder; the two adjacent elastic bodies are connected through a double male connector, and the middle part of the double male connector is provided with a middle protruding part with the outer diameter larger than that of the elastic bodies. The fracturing bomb realizes the custom management of the multi-pulse energy output mode in the fracturing process, can generate shock waves with characteristic frequency bands to be loaded on the stratum, so that a plurality of radial crack groups which are not controlled by ground stress are formed in a near-wellbore zone, and the effects of volume transformation, stability and high-efficiency output on oil and gas well exploitation and old well activation are achieved.
Description
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 a built-in segmented grain.
Background
Since the beginning of this century, the technology of built-in full-charge composite high-energy material fracturing guns represented by GasGun was promoted on a large scale from the beginning of exploitation of foreign oil and gas wells. The technology realizes that the exploitation radius, daily yield and stable yield period of a single well are greatly increased, the total recovery ratio reaches 50%, and the cost is reduced by 2/3; the reservoir reforming effect produces a qualitative leap; meanwhile, the method has the advantages of safe use, simple and convenient construction and the like. Has achieved great success in the old well activation and low-hole hypotonic well reconstruction.
The hydraulic fracturing is applied to the current reservoir exploitation and transformation technology in China on a large scale, a plurality of radial cracks with radial long distance cannot be formed in a near wellbore zone due to the influence of ground stress in the process of implementation, and long-term support of the cracks is very difficult due to the fact that stratum dislocation in the hydraulic fracturing process is very little, so that stratum seepage capability is extremely limited.
In recent years, most of the tested fracturing technologies related to the composite high-energy materials are bare external shell-free fracturing bullets, and the problems of unsafe construction, uncontrollable combustion, unobvious effect and the like exist. Currently, a multi-stage composite deep penetration perforating device disclosed by publication No. CN203285405U is also arranged in a fracturing gun body to improve safety, and comprises at least one integral perforating unit, wherein the integral perforating unit comprises a fracturing gun assembly and a composite perforating tool, the fracturing gun assembly comprises a cylindrical upper connector, a cylindrical fracturing gun body and a cylindrical middle connector which are sequentially and fixedly connected from top to bottom, the fracturing gun body is provided with a fracturing cartridge, and the side wall of the fracturing gun body is provided with a plurality of pressure relief holes. The perforating charges in the composite perforator form tunnels, two-stage gunpowder is excited to burn step by step, high-temperature and high-pressure gas is generated in a shaft and directly enters the perforation tunnels, the pressure acting time is greatly prolonged through multiple acting, and the thinner unconventional hydrocarbon reservoir can be effectively subjected to gas fracturing, so that deep penetration of a pore gap combination type is formed, and the diversion capacity of a near-wellbore zone is improved.
Disclosure of Invention
In order to solve the problem of low construction safety of bare-chemical external shell-less fracturing bomb in the prior art, the invention provides a multi-pulse high-energy gas fracturing bomb with built-in staged grain, which is mainly characterized in that the customized management of multi-pulse energy output modes in the fracturing process is realized by arranging special high-energy material grains in the staged manner in the fracturing bomb, and on the premise of ensuring construction safety, shock waves with characteristic frequency bands are generated to be loaded on a stratum, so that a plurality of radial crack groups which are not controlled by ground stress are formed in a near wellbore zone, the effects of volume transformation, stability and high efficiency production on oil and gas well exploitation and old well activation are achieved, and the problems that the fracturing effect single production is low, radial cracks cannot be formed in a radial long distance network and the stratum seepage capacity is limited in the fracturing bomb in the prior art are overcome; the combustion is uncontrollable, the construction is unsafe, and the operation cost is high.
The invention provides a multi-pulse high-energy gas fracturing bomb with built-in segmented grain, which comprises a baffle igniter, a plurality of elastic bodies, a shock-resistant disc connector and a shock-resistant disc which are sequentially and axially connected;
The device comprises a shell body, wherein a plurality of pressure relief holes are formed in the circumferential side wall of the shell body, a central ignition tube is axially arranged in the center of the shell body, a ring-shaped cavity formed between the shell body and the central ignition tube is filled with a paste high-energy material grain, and the central ignition tube is filled with an ignition powder with the burning speed being greater than that of the paste high-energy material grain;
an exploder for igniting the paste high-energy material grain and the ignition powder is arranged in the partition igniter;
the two adjacent elastic bodies are connected through a double male connector, and the middle part of the double male connector is provided with a middle protruding part with the outer diameter larger than that of the elastic bodies.
In an embodiment, the pressure relief hole is a through hole, a step through hole, or a step through hole provided with a blocking piece.
In one embodiment, the bulkhead igniter further comprises a bulkhead connector in threaded connection with the elastomer, wherein a cavity for placing the initiator, and a gland and a clamp for fixing the initiator are arranged in the bulkhead connector.
In an embodiment, the shell of the paste high-energy material grain is made of a fluoroplastic pipe.
In an embodiment, a plurality of kidney-shaped holes distributed along the axial direction are arranged on the circumferential side wall of the central ignition tube, two ends of the central ignition tube are also sleeved with brackets, and at least more than two struts distributed along the radial direction are arranged on the brackets.
In one embodiment, the middle bulge is provided with chamfers on both sides.
In one embodiment, the outer surface of the intermediate boss is knurled.
In an embodiment, one end of the impact disc connector is an external thread connected with the elastomer, the other end of the impact disc connector is an internal thread connected with the impact disc, and the external diameter of the internal thread end of the impact disc connector is the same as the diameter of the middle protruding part.
In an embodiment, the anti-collision disc comprises a connecting rod, and a threaded connector, a proximal disc, a plurality of middle discs and a distal disc which are connected in sequence through the connecting rod;
wherein the proximal disc is closest to the impact disc joint, the distal disc is furthest from the impact disc joint, and the diameter of the distal disc is smaller than the diameter of the proximal disc and smaller than the diameter of the intermediate disc.
In one embodiment, the peripheral edges of the proximal disc, the middle disc and the distal disc are provided with chamfers, and the chamfer side length is not less than 12mm.
Based on the above, compared with the prior art, the multi-pulse high-energy gas fracturing bomb with the built-in segmented grain provided by the invention has the following technical effects:
1. the segmented explosive column can be directly loaded into the elastomer on site, and the whole process of bullet and explosive split transportation safety requirement is realized without the need of pre-assembly on a special site.
2. The special baffle igniter is adopted, independent sealing is realized during assembly, high-temperature high-speed metal jet flow is output after excitation, and the explosive column can be ignited in air or water medium, so that the technical effect of safe and reliable ignition is effectively realized, and the pressure condition of an ultra-deep well is adapted.
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 in an accelerating way, the high-energy gas is matched with the gas quantity required by the extension of stratum cracks, the effective pressure maintenance time of a shaft is prolonged, and the joint making distance is longer.
4. The multistage arrangement of the paste high-energy material can skillfully utilize the formation temperature change rule, and the peak pressure output in the shaft rises linearly along with the increase of the operation depth, so that the paste high-energy material is automatically matched with the formation fracture pressure of 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
For a clearer description of embodiments of the invention or of the solutions of the prior art, the drawings that are needed in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art; the positional relationships described in the drawings in the following description are based on the orientation of the elements shown in the drawings unless otherwise specified.
FIG. 1 is a schematic diagram of a multi-pulse high energy gas fracturing bomb with built-in segmented grain;
FIG. 2is a schematic view of the structure of a bulkhead igniter;
FIG. 2.1 is a schematic view of a bulkhead fitting;
FIG. 2.2 is a schematic diagram of a clamp structure;
fig. 2.3 is a schematic diagram of a gland structure
Fig. 2.4 is a schematic axial projection of the gland of fig. 2.3;
FIG. 3 is a schematic view of an elastomeric structure;
FIG. 3.1 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 4 is a schematic diagram of a plug structure;
FIG. 5 is a schematic view of the structure of a center squib;
fig. 5.1 is an axial projection of the center squib of fig. 5;
FIG. 6 is a schematic diagram of a double male connector structure;
FIG. 7 is a schematic view of a scour protection disk joint;
fig. 8 is a schematic view of the structure of the impact-resistant disc.
Reference numerals:
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention; the technical features designed in the different embodiments of the 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that all terms used in the present invention (including technical terms and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs and are not to 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 built-in segmented grain, which comprises a baffle igniter 100, a plurality of elastic bodies 200, a impact disc joint 400 and an impact disc 500 which are axially connected in sequence, wherein the whole appearance of the components is approximately hollow cylindrical or barrel-shaped. Specifically, the bulkhead igniter 100 and the projectile 200, the projectile 200 and the impact disc joint 400, and the impact disc joint 400 and the impact disc 500 are all screwed, and O-rings are attached to the portions to be sealed.
The blank of the projectile body 200 adopts a perforating gun barrel which is standard in the oilfield industry, and can bear the pulse internal pressure of more than 380MPa after the toughness is improved through heat treatment. A center squib 220 is axially provided at the center of the projectile 200, and an annular cavity formed between the projectile 200 and the center squib 220 is filled with a paste high energy material pellet 210, and generally, the length of the center squib 220 is identical to the length of the corresponding paste high energy material pellet 210. Specifically, the outer shell of the paste high-energy material grain 210 and the center squib 220 are made of thin-walled fluoroplastic pipe.
The center squib 220 is filled with a squib 230 having a burning rate greater than that of the paste high-energy material grain; specifically, the ignition charge 230 is located in the center squib 220 and is located in the center of the paste high energy material column 210, and the ignition charge 230 is rectangular columnar or cylindrical and is formed into an elongated shape or integrally formed by a plurality of connections.
Referring to fig. 3, the circumferential side wall of the projectile body 200 is provided with a plurality of pressure relief holes 201 as main output channels of shock waves, and preferably, the pressure relief holes 201 are symmetrically distributed in pairs and axially equidistant, and the projectile body 200 adopts a symmetrical perforating mode, so that large-amplitude displacement of transverse swing can be effectively eliminated, and damage to tools or sleeves can be effectively avoided.
Specifically, referring to fig. 3.1 and 4, the pressure relief hole 201 may be a through hole, a stepped through hole, or a stepped through hole provided with a blocking piece 202, wherein the stepped through hole provided with the blocking piece 202 is preferable, and an O-ring seal is adopted between the blocking piece 202 and the elastomer 200.
The length of the assembled fracturing tree is determined by the number of the tree 200, and the number of the tree 200 is generally determined by the length of the working section. The two adjacent elastomers 200 are connected through the double male connector 300, the double male connector 300 is of a hollow structure and is used for transmitting fire between the two connected elastomers 200, so that the high-energy material explosive column 210 of the paste is burnt backwards in sequence, and the materials of the double male connector 300 are the same as those of the elastomers 200.
Likewise, the elastomeric body 200 is threaded with the double pin 300 and is sealed with an O-ring.
The middle part of the double male joint 300 with reference to fig. 6 is further provided with a middle protrusion part 310 having an outer diameter larger than that of the projectile 200, so that a certain gap is maintained between the projectile 200 and the casing wall during the down-hole process, the projectile 200 is prevented from being scratched or the blocking piece 202 is prevented from being scraped, and the safety performance of construction is improved.
Mounted within the bulkhead igniter 100 is an initiator 101 for igniting the paste energetic material charge 210 and the ignition charge 230, which operates in the following manner:
When the initiator 101 in the bulkhead igniter 100 is activated, the axially output high temperature metal jet ignites the paste energetic material charge 210 and the ignition charge 230. Because the ignition charge 230 burns faster, the center of the paste high energy material charge 210 is penetrated and ignited, the paste high energy material charge 210 is radially and surface-enhanced burned in the newly generated inner hole, and the generated gas rapidly expands towards the shaft sleeve along the pressure release hole 201 on the elastomer 200, so that the generated shock wave acts on the reservoir layer to form a radial volume crack group. And part of the shock waves are reflected for multiple times in the sleeve, and a multi-pulse effect is generated after random reinforcement and weakening, so that the reservoir seam making effect is enhanced. Meanwhile, when the paste high-energy material grain 210 burns in a face increasing way, the output high-energy gas quantity is gradually increased, and is matched with the gas quantity acceleration consumption in the crack extension process, the effective pressure maintenance 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 connector 110 in threaded connection with the projectile 200, wherein a cavity for placing the initiator 101, a gland 120 for fixing the end of the initiator 101 away from the projectile 200, and a clamp 130 for fixing a part of the circumferential side wall of the initiator 101 are arranged in the bulkhead connector 110, the initiator 101 is excited to axially output a metal jet, and the metal jet is ejected through the bulkhead connector 110 near the bottom end face of the projectile 200 to ignite the high-energy material cartridge 210 and the ignition charge 230; wherein, the clamp 130 is provided with external threads matching with the internal threads of the bulkhead fitting 110, and the gland 120 is provided with a mounting hole 121 for fixing an assembly tool, as shown in fig. 2.4.
Preferably, as shown in fig. 2.2, the side walls of the clamp 130 are uniformly perforated for attenuating the effect of detonation waves during operation.
Preferably, referring to fig. 5, the circumferential side wall of the central squib 220 is provided with a plurality of axially distributed kidney-shaped holes, preferably equidistantly staggered, to facilitate the transfer of flame to the charge of high energy material 210 during operation of the ignition charge 230.
Referring to fig. 5.1, the center squib 220 is further provided with brackets 221 at both ends thereof, which may be fixed by riveting, welding or gluing. The support 221 has at least more than two radially distributed struts 221a, and in the embodiment shown in fig. 5.1, the number of struts 221a is 4, and the support 221 is mainly used for positioning the central squib 220 at the inner center of the projectile 200, and has a limiting effect, so that the ignition charge 230 ignites at the center of the paste energetic material cartridge 210.
Preferably, as shown in fig. 6, chamfer angles with an angle B are arranged on the periphery of two sides of the middle protruding portion 310, so that broken casing pipes are prevented from being blocked in the process of pushing down and lifting up the fracturing bomb, and construction safety is further guaranteed.
In some embodiments, the middle boss 310 is further provided with a plurality of mounting holes 311 for securing a special tool during assembly.
Preferably, the outer surface of the middle boss 310 is knurled to increase friction during installation.
In one embodiment, as shown in fig. 7, the impact disc connector 400 has an external thread at one end connected to the projectile 200 and an internal thread at the other end connected to the impact disc 500, and the external diameter of the internal thread end of the impact disc connector 400 is the same as the diameter of the middle boss 310.
Preferably, the outer surface of the internally threaded end of the impact disc connector 400 is also knurled, with an end face having a distance D machined for special installation tool securement. The portion adjacent to the projectile 200 is also provided with a chamfer angle E to prevent the broken casing from being stuck during the running and lifting of the fracturing projectile.
Preferably, referring to fig. 8, the impact disc 500 comprises a connection rod 501, and a threaded connection head 510, a proximal disc 520, several intermediate discs 530 and a distal disc 540 connected in sequence by the connection rod 501; the impact disc 500 may be integrally or sectionally fabricated, and then assembled by welding or screwing, etc., and is made of the same material as the projectile 200.
The proximal disc 520, the plurality of intermediate discs 530 and the distal disc 540 are used as structural members for mainly bearing impact force in the impact protection disc 500, and the impact protection disc 500 with the design is arranged at the tail part of the fracturing bomb, so that large displacement caused by longitudinal swing can be effectively eliminated, and damage to tools or sleeves can be effectively avoided.
Wherein the proximal disc 520 is closest to the impact disc joint 400, the distal disc 540 is furthest from the impact disc joint 400, and the diameter of the distal disc 540 is smaller than the diameter of the proximal disc 520 and smaller than the diameter of the middle disc 530, and the diameters of all the middle discs 530 are equal, so the impact disc 500 is designed to fully exert its cushioning effect. The number of intermediate disks 530 in the embodiment shown in fig. 8 is 2, but is not limited thereto.
Preferably, the peripheral edges of the proximal disc 520, the middle disc 530 and the distal disc 540 are provided with chamfers, in particular 90 ° chamfers, and the chamfer side length is not less than 12mm, which effectively prevents frac flick of the card.
The O-shaped rings used for sealing are made of high-hardness and high-temperature-resistant fluororubber materials, and can be used at a depth of 7500 meters in the pit.
In summary, compared with the prior art, the multi-pulse high-energy gas fracturing bomb with the built-in segmented grain provided by the invention has the following technical effects:
1. The explosive is placed in the fracturing bomb in a segmented mode by the aid of the high-energy material of the paste, the center ignition is achieved, the explosive is burnt in a face increasing mode, the output high-energy gas quantity is gradually increased, and the gas is matched with gas acceleration consumption in the crack extension process. The modularized sectional explosive column realizes the separation and transportation of the bullet and the explosive, is simply assembled on site and is safe in the well construction. The multi-pulse working mode applies the shock wave with characteristic frequency band to the stratum, and the crack extension distance can reach 30m or even longer, so that the near well region generates the technical effect of radial crack groups.
2. By adopting the special baffle igniter, the device is independently sealed during assembly, and high-temperature and high-speed metal jet flow is output after excitation, so that the explosive column can be ignited in air or water medium, the device is suitable for the pressure condition of an ultra-deep well, and the technical effect of safe and reliable ignition is effectively realized.
3. The one-way pressure-bearing sealing technology of the stepped hole and the blocking piece is preferably adopted, so that the technical effect of synchronously solving the problem of overpressure in the elastomer after the high-energy material is isolated from well fluid and ignited is effectively realized.
4. The symmetrical holes of the elastic bodies and the impact-resistant discs at the tail parts are preferably adopted, so that the transverse swing and the large-amplitude displacement in the longitudinal direction are effectively eliminated, and the technical effects of damage to tools and sleeves are avoided.
In addition, it should be understood by those skilled in the art that although there are many problems in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.
Although terms such as a septum igniter, initiator, septum adaptor, gland, mounting hole, clamp, elastomer, pressure relief hole, plug, center squib, bracket, post, ignition charge, paste energetic material cartridge, double male adaptor, middle boss, mounting hole, impact disc adaptor, impact disc, connecting rod, threaded connector, proximal disc, middle disc, distal disc, etc. are more used herein, the possibility of using other terms is not precluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention; the terms first, second and the like in the description and in the claims of embodiments of the invention and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
1. A multi-pulse high-energy gas fracturing bomb with a built-in segmented grain is characterized in that: comprises a baffle igniter (100), a plurality of elastic bodies (200), a shock-proof disc joint (400) and a shock-proof disc (500) which are axially connected in sequence;
A plurality of pressure relief holes (201) are formed in the circumferential side wall of the elastomer (200), a central ignition tube (220) is axially arranged in the elastomer (200), a ring-shaped cavity formed between the elastomer (200) and the central ignition tube (220) is filled with a paste high-energy material grain (210), and the central ignition tube (220) is filled with an ignition powder (230) with the burning speed being greater than that of the paste high-energy material grain;
An initiator (101) for igniting the paste high-energy material explosive column (210) and the ignition powder (230) is arranged in the partition igniter (100); the baffle igniter (100) further comprises a baffle connector (110) in threaded connection with the elastic body (200), and a cavity for placing the initiator (101) and a gland (120) and a clamp (130) for fixing the initiator (101) are arranged in the baffle connector (110); an external thread matched with the internal thread of the partition board joint (110) is arranged at one end, close to the elastomer (200), of the clamp (130), and a part of the circumferential side wall of one end, far away from the elastomer (200), of the clamp (130) is fixed with the circumferential side wall of the initiator (101) and forms a gap with the inner wall of the partition board joint (110); the gland (120) is connected with one end of the clamp (130) away from the projectile body and fixes the end of the initiator (101) away from the projectile body (200); the clamp (130) is used for fixing the circumferential side wall of the initiator (101) and uniformly perforating; the initiator (101) is used for axially outputting a metal jet after being excited so as to penetrate through the baffle joint (110) to be close to the bottom end face of the elastomer (200) and ignite the high-energy material grain (210) and the ignition powder (230);
The two adjacent elastic bodies (200) are also connected through a double male connector (300), and the middle part of the double male connector (300) is provided with a middle protruding part (310) with the outer diameter larger than that of the elastic bodies (200);
The double male connector (300) is of a hollow structure and is used for transmitting fire between two adjacent elastic bodies (200) so that a plurality of paste high-energy material grains (210) in the elastic bodies (200) can be combusted in sequence to provide shock waves with characteristic frequencies to be loaded in a stratum; the ignition powder (230) enables the center of the paste high-energy material grain (210) to be penetrated and ignited, so that the paste high-energy material grain (210) is subjected to radial surface-enhanced combustion in a newly generated inner hole, generated gas rapidly expands towards a shaft sleeve along the pressure release hole (201) on the elastomer (200), and shock waves are generated to act on a reservoir layer to form radial volume crack groups; and part of the shock waves are reflected in the well casing for multiple times, and a multi-pulse effect is generated after random strengthening and weakening.
2. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the pressure relief hole (201) is a through hole.
3. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the pressure relief hole (201) is a step through hole.
4. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the pressure relief hole (201) is a step through hole provided with a blocking piece (202).
5. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the shell of the paste high-energy material grain (210) is made of fluoroplastic pipe.
6. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the central ignition tube (220) is characterized in that a plurality of kidney-shaped holes distributed along the axial direction are formed in the circumferential side wall of the central ignition tube (220), two ends of the central ignition tube (220) are sleeved with supports (221), and at least more than two struts (221 a) distributed along the radial direction are arranged on the supports (221).
7. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: chamfer angles are arranged on the peripheries of two sides of the middle protruding portion (310).
8. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the outer surface of the middle protruding part (310) is provided with knurling.
9. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: one end of the anti-impact disc joint (400) is provided with external threads and is connected with the elastomer (200), the other end of the anti-impact disc joint is provided with internal threads and is connected with the anti-impact disc (500), and the external diameter of the internal thread end of the anti-impact disc joint (400) is the same as the diameter of the middle protruding part (310).
10. The multi-pulse high energy gas fracturing bomb of the built-in segmented grain of claim 1, wherein: the anti-collision disc (500) comprises a connecting rod (501), and a threaded connector (510), a proximal disc (520), a plurality of middle discs (530) and a distal disc (540) which are connected sequentially through the connecting rod (501);
wherein the proximal disc (520) is closest to the anti-collision disc joint (400), the distal disc (540) is furthest from the anti-collision disc joint (400), and the diameter of the distal disc (540) is smaller than the diameter of the proximal disc (520) and smaller than the diameter of the intermediate disc (530).
11. The multi-pulse high energy gas fracturing bomb of claim 10, wherein said bomb comprises: the peripheral edges of the proximal disc (520), the middle disc (530) and the distal disc (540) are provided with chamfers, and the chamfer side length is not less than 12mm.
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| CN202210482139.9A CN115030693B (en) | 2022-05-05 | 2022-05-05 | Multi-pulse high-energy gas fracturing bomb with built-in segmented grain |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098163A (en) * | 1993-07-26 | 1995-02-01 | 西安近代化学研究所 | Non-shell press-cracking bomb |
| CN2823549Y (en) * | 2005-06-15 | 2006-10-04 | 王安仕 | Chemical reaction pneumatic force deep penetration heat-deblocking device for oil-gas well |
| CN102031952A (en) * | 2010-11-26 | 2011-04-27 | 中国航天科技集团公司川南机械厂 | Multi-stage perforation supercharging method |
| CN202467792U (en) * | 2012-03-21 | 2012-10-03 | 甘肃省化工研究院 | Pressure generating device |
| CN106368663A (en) * | 2016-11-17 | 2017-02-01 | 西安物华巨能爆破器材有限责任公司 | Oil-gas well high-energy gas fracturing yield increasing device |
| CN213627545U (en) * | 2020-05-17 | 2021-07-06 | 西安物华巨能爆破器材有限责任公司 | Multi-pulse high-energy gas fracturing structure without falling objects in well |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7721820B2 (en) * | 2008-03-07 | 2010-05-25 | Baker Hughes Incorporated | Buffer for explosive device |
| US8950487B2 (en) * | 2011-12-06 | 2015-02-10 | Schlumberger Technology Corporation | Assemblies and methods for minimizing pressure-wave damage |
-
2022
- 2022-05-05 CN CN202210482139.9A patent/CN115030693B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098163A (en) * | 1993-07-26 | 1995-02-01 | 西安近代化学研究所 | Non-shell press-cracking bomb |
| CN2823549Y (en) * | 2005-06-15 | 2006-10-04 | 王安仕 | Chemical reaction pneumatic force deep penetration heat-deblocking device for oil-gas well |
| CN102031952A (en) * | 2010-11-26 | 2011-04-27 | 中国航天科技集团公司川南机械厂 | Multi-stage perforation supercharging method |
| CN202467792U (en) * | 2012-03-21 | 2012-10-03 | 甘肃省化工研究院 | Pressure generating device |
| CN106368663A (en) * | 2016-11-17 | 2017-02-01 | 西安物华巨能爆破器材有限责任公司 | Oil-gas well high-energy gas fracturing yield increasing device |
| CN213627545U (en) * | 2020-05-17 | 2021-07-06 | 西安物华巨能爆破器材有限责任公司 | Multi-pulse high-energy gas fracturing structure without falling objects in well |
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| CN115030693A (en) | 2022-09-09 |
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