CN208416506U - Orthogonal net stitches pressure break perforating system - Google Patents
Orthogonal net stitches pressure break perforating system Download PDFInfo
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- CN208416506U CN208416506U CN201820853527.2U CN201820853527U CN208416506U CN 208416506 U CN208416506 U CN 208416506U CN 201820853527 U CN201820853527 U CN 201820853527U CN 208416506 U CN208416506 U CN 208416506U
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Abstract
A kind of orthogonal net seam pressure break perforating system, it is related to oil and gas wells in oil fields perforation completion field, including gun body, gun body is the hollow cavity of both ends open, gun body one end is connect with priming adapter, priming adapter is in contact with perforating system one end, the perforating system other end is connect with final quotaion, final quotaion is connect with disk is tensed, it tenses to connect in disk and gun breech and be in contact, the gun body other end connect with gun breech or connects in passing through and connect with next section gun body, the perforating system farthest realizes rock gap, perforation between rock stratum, transverse crack face and Vertical Cracks face caused by perforation are criss-cross, construct criss-cross net seam system, maximum oil-collecting effect can be obtained in well section in reservoir oil reservoir, greatly improve the recovery ratio of oil gas, and by changing the medium between perforating bullet and perforating bullet, weakened using reinforcing fiber nylon bullet support and is eliminated between bullet Interference.
Description
Technical field
The utility model relates to oil and gas wells in oil fields perforation completion fields, and in particular to a kind of orthogonal net seam pressure break perforation dress
It sets.
Background technique
Nearly well rock stratum brings up the concept of net seam system using pressure break, just has proposed in foreign countries very early.I.e. in Completion Operations,
By pressing crack construction, perfect net seam system is created, obtains maximum oil-collecting effect, Jin Erti in well section in reservoir oil reservoir
The recovery ratio of high oil gas.In the past, perpendicular to the conventional perforation of pit shaft, perforation tunnel is all single independence in all perforated intervals
, the gap that can be produced by duct pressure break is more by natural fractures or prolonging geological stress direction freely extends,
The gap made is random, can not preset.
With the development in oil field, unconventional oil and gas exploration and development needs mating new-type completion technique, goes to excavate conventional penetrate
Hole fracturing technique laser well-completing process fundamentally changes the potential that the prior art cannot achieve.Determine grinding for face perforating technology
It sends out successfully, is the realization of net seam pressure break from principle, provides feasible approach.Especially it is cut by laser firing mount technology maturation
Afterwards, allow the cloth bullet mode of perforator that revolutionary development has occurred, the jet direction of perforating bullet realizes controllably.Pressure break is stitched for net
Realization, lay a good foundation, become it is feasible.Understand the production method of firing mount in perforating appliances, we set the axle center of perforating bullet
The vertical line angle of the central axes of line and firing mount is firing angle, then laser firing mount can make arbitrarily penetrating for 0~45 ° of perforating bullet realization
Angle, the perforating appliances after changing cloth bullet mode, the primacord length Length discrepancy between bullet and bullet, propagation of explosion time are unequal；Bullet and bullet
Between distance become smaller, these factors produce large effect to the stability of perforator, therefore can generate charge interference, for understand
Certainly above-mentioned technical problem, spy propose a kind of new technical solution.
Utility model content
The purpose of this utility model is to overcome above-mentioned the shortcomings of the prior art places, and provide a kind of orthogonal net
Pressure break perforating system is stitched, pressure break only forms single independent section after solving the problems, such as previous perforation, vertical by what is realized after pressure break
Traversed by mistake net seam system, substantially increases the percolation ability between reservoir and pit shaft, can greatly improve the recovery ratio of oil gas.
The technical solution adopted in the utility model are as follows: a kind of orthogonal net seam pressure break perforating system, including gun body, feature exist
In: gun body is the hollow cavity of both ends open, and gun body one end is connect with priming adapter, and priming adapter connects with perforating system one end
Touching, the perforating system other end are connect with final quotaion, and final quotaion is connect with disk is tensed, and are connect and are in contact in tension disk and gun breech, gun body is another
End connect with gun breech or connects in passing through to be connect with next section gun body.
The perforating system include positioning disk, deep penetrating charge, reinforcing fiber nylon bullet support, laser cutting firing mount and
Primacord, the positioning disk are in contact with priming adapter, and positioning disk is connect with laser cutting firing mount one end, are cut by laser firing mount
The other end is connect with final quotaion, and reinforcing fiber nylon bullet support is equipped with inside laser cutting firing mount, is set inside reinforcing fiber nylon bullet support
There is deep penetrating charge, deep penetrating charge is connect with primacord.
The deep penetrating charge includes body, silk pressing and groove, is equipped with groove, trench interiors at the top of the body
Equipped with primacord, silk pressing is additionally provided on body.
The laser cutting firing mount includes frame body and perforation cluster A, and frame body is equipped with three groups of perforation cluster A；The enhancing
Filled nylon bullet support is made of three groups of bullet support A, and bullet support A includes bullet support D and bullet support E.
The perforation cluster A includes shooting hole A, shooting hole B, shoot hole C, shoot hole D and shoot hole E, and described shoots
Hole A and hole C is shot in opposite directions with 17 degree firing angles and 120 degree of phase angles arrangements；Described shoots hole B perpendicular to frame body central axes cloth
It sets；Described shooting hole D and shoot hole E is arranged and is shot hole D in opposite directions with 6 degree of firing angles and 0 degree of phase angle and shoot the friendship of hole E jet stream
It is compiled in a bit；The bullet support D is equipped with perforation D and perforation E, the center line of the perforation D and the center line weight for shooting hole D
It closes, the center line of the perforation E is overlapped with the center line for shooting hole E, and the bullet support E is equipped with perforation A, perforation B and penetrates
Hole C, the center line of the perforation A are overlapped with hole A center line is shot, and the center line of the perforation B and shoot hole B center line
It is overlapped, the center line of the perforation C is overlapped with hole C center line is shot.
The laser cutting firing mount includes frame body and perforation cluster B, and frame body is equipped with three groups of perforation cluster B, and perforation cluster B includes
Perforation cluster C and perforation cluster D；The reinforcing fiber nylon bullet support is made of three groups of bullet support B, and bullet support B includes bullet support C and bullet support E.
The perforation cluster C includes shooting hole F, shoot hole G and shooting hole H, described to shoot hole F and to shoot hole H opposite
With 17 degree of firing angles and 120 degree of phase angle arrangements, described shoots hole G to arrange perpendicular to the central axes of frame body；The perforation
Cluster D includes shooting hole I, shoot hole J and shooting hole K, described to shoot hole I and shoot hole K in opposite directions with 6 degree phase angles of firing angle as 0
Degree arrangement, the described hole J that shoots are described to shoot hole I, shoot hole J, shoot hole K and penetrate to arrange perpendicular to the central axes of frame body
Stream is intersected in a bit；The bullet support C is equipped with perforation I, perforation J and perforation K, the center line of the perforation I and shoots hole I
Center line be overlapped, the center line of the perforation J is overlapped with the center line for shooting hole J, the center line and dress of the perforation K
The center line of shell hole K is overlapped, and the bullet support E is equipped with perforation A, perforation B and perforation C, the center line and dress of the perforation A
The center line of shell hole F is overlapped, and the center line of the perforation B is overlapped with the center line for shooting hole G, the center of the perforation C
Line is overlapped with the center line for shooting hole H.
The beneficial effects of the utility model are: the perforating system farthest realizes the perforation between rock gap, rock stratum, penetrate
Transverse crack face and Vertical Cracks face caused by hole are criss-cross, construct criss-cross net seam system, can be in reservoir
Maximum oil-collecting effect is obtained in oil reservoir in well section, greatly improves the recovery ratio of oil gas, and by changing perforating bullet and perforation
Medium between bullet weakens using reinforcing fiber nylon bullet support and eliminates charge interference.
Detailed description of the invention
Fig. 1 is the utility model structure diagram.
Fig. 2 is the utility model perforation cluster A structural schematic diagram.
Fig. 3 is the utility model perforation cluster B structure schematic diagram.
Fig. 4 is the utility model deep penetrating charge structural schematic diagram.
Fig. 5 is the utility model bullet support C-structure schematic diagram.
Fig. 6 is the utility model bullet support D structural schematic diagram.
Fig. 7 is the utility model bullet support E structural schematic diagram.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.
Referring to each figure, a kind of orthogonal net seam pressure break perforating system, including gun body 7, gun body 7 are the hollow cavity of both ends open
Body, 7 one end of gun body are connect with priming adapter 1, and priming adapter 1 is in contact with perforating system one end, the perforating system other end and tail
Disk 8 connects, and final quotaion 8 is connect with disk 9 is tensed, and connects and is in contact in tension disk 9 and gun breech 8,7 other end of gun body connect with gun breech 8 or
It connects in and is connect with next section gun body 7.
The perforating system includes positioning disk 2, deep penetrating charge 3, reinforcing fiber nylon bullet support 4, laser cutting bullet
Frame 5 and primacord 6, the positioning disk 2 are in contact with priming adapter 1, and positioning disk 2 is connect with laser cutting 5 one end of firing mount, swash
Light cutting 5 other end of firing mount is connect with final quotaion 8, is cut by laser inside firing mount 5 and is equipped with reinforcing fiber nylon bullet support 4, reinforcing fiber
Deep penetrating charge 3 is equipped with inside nylon bullet support 4, deep penetrating charge 3 is connect with primacord 6.
The deep penetrating charge 3 includes body 301, silk pressing 302 and groove 303, is equipped at the top of the body 301
Groove 303 is equipped with primacord 6 inside groove 303, is additionally provided with silk pressing 302 on body 301.During use, pass through groove
The position of 303 pairs of primacords 6 is defined, and move primacord 6 will not, while solid by gluing in locking hole 302
Silk pressing 302 can be such that primacord 6 does not move, and fix it more firm, it is ensured that primacord can be to body 301
It is ignited.
The laser cutting firing mount 5 includes frame body and perforation cluster A, and frame body is equipped with three groups of perforation cluster A；The enhancing
Filled nylon bullet support 4 is made of three groups of bullet support A, and bullet support A includes bullet support D23 and bullet support E24.
The perforation cluster A includes shooting hole A11, shooting hole B12, shoot hole C13, shoot hole D14 and shoot hole E15,
Described shooting hole A11 and shoot hole C13 is arranged in opposite directions with 17 degree of firing angles and 120 degree of phase angles；Described shoots hole B12 to hang down
Directly arranged in frame body central axes；Described shooting hole D14 and shoot hole E15 is in opposite directions 0 degree of arrangement with 6 degree of phase angles of firing angle and fills
It shell hole D14 and shoots hole E15 jet stream and is intersected in a bit；The bullet support D23 is equipped with perforation D231 and perforation E232, described
The center line of perforation D231 is overlapped with the center line for shooting hole D14, the center line of the perforation E232 and is shot in the E15 of hole
Heart line is overlapped, and the bullet support E24 is equipped with perforation A241, perforation B242 and perforation C243, the center of the perforation A241
Line is overlapped with hole A11 center line is shot, and the center line of the perforation B242 is overlapped with hole B12 center line is shot, and described penetrates
The center line of hole C243 is overlapped with hole C13 center line is shot.It is mounted on and shoots hole A11, shoot hole B12, shoot the depth in the C13 of hole
Three perforation tunnels that penetrating perforating bumb 3 is formed when projecting approximatively are in the same plane, and the stress between each duct compares
It concentrates, can be penetrated through first in pressure break, form a covering of the fan channel, frac pressure can converge in this region, reboot pressure break and split
It stitches the covering of the fan direction first cracked by three perforation tunnels to extend, realizes the controllability in laterally main pressure-break face, be pressure break
Lateral seam provides condition；It shoots hole D14, shoot hole E15 with 6 degree of firing angles, opposite cloth bullet, phase angle is 0 degree, and jet stream is intersected in
A bit, perforation tunnel pressure break perforation after formed a triangular wedge region, zonule take the lead in perforation be frac pressure increase-volume and
Offer condition is provided, to realize the controllability in longitudinal main pressure-break face, provides condition for pressure break longitudinal direction seam；It is mounted on and shoots
Hole A11, shoot hole B12, shoot hole C13, shoot hole D14, shoot hole E15 five launch hole bullets be cluster cloth bullet mode, often
Three clusters, i.e. 15 holes Kong Miwei/rice are distributed on rice bullet, and when perforation forms three groups of criss-cross cracks, has effectively achieved rock stratum
Pressure break is cracked in length and breadth, realizes that making for net system of seam is built near wellbore formation.Such arrangement mode is suitable for thin oil rock layer perforation.It is filling
It shell hole D14 and shoots and is provided with a bullet support D23 in the E15 of hole, perforation D231 and perforation E232 on bullet support D23 and shoot hole
D14 is identical with phase with the angle for shooting two holes hole E15, and perforation D231 and perforation E232 on bullet support D23 are penetrated with 6 degree
Angle, opposite cloth bullet, phase angle are 0 degree, and jet stream is intersected in a bit, and deep penetrating charge 3 is assemblied in bullet support D23, reinforcing fiber
4 support of nylon bullet plays the role of decrease and eliminates the charge interference of deep penetrating charge.
The laser cutting firing mount 5 includes frame body and perforation cluster B, and frame body is equipped with three groups of perforation cluster B, perforation cluster B packet
Include perforation cluster C and perforation cluster D；The reinforcing fiber nylon bullet support 4 is made of three groups of bullet support B, bullet support B include bullet support C22 and
Bullet support E24.
The perforation cluster C includes shooting hole F16, shoot hole G17 and shooting hole H18, and described shoots hole F16 and shoot
For hole H18 in opposite directions with 17 degree of firing angles and 120 degree of phase angle arrangements, described shoots hole G17 to arrange perpendicular to the central axes of frame body；
The perforation cluster D includes shooting hole I19, shoot hole J20 and shooting hole K21, described to shoot hole I19 and shoot hole K21 phase
To being 0 degree of arrangement with 6 degree of phase angles of firing angle, described shoots hole J20 to arrange that described shoots perpendicular to the central axes of frame body
Hole I19, it shoots hole J20 and shoots hole K21 jet stream and be intersected in a bit；The bullet support C22 is equipped with perforation I221, perforation J222
And perforation K223, the center line of the perforation I221 are overlapped with the center line for shooting hole I19, the center of the perforation J222
Line is overlapped with the center line for shooting hole J20, and the center line of the perforation K223 is overlapped with the center line for shooting hole K21, described
Bullet support E24 be equipped with perforation A241, perforation B242 and perforation C243, the center line of the perforation A241 and shoot hole F16
Center line be overlapped, the center line of the perforation B242 is overlapped with the center line for shooting hole G17, in the perforation C243
Heart line is overlapped with the center line for shooting hole H18.The deep penetration for being mounted on and shooting hole F16, shoot hole G17 and shoot in the H18 of hole is penetrated
Three perforation tunnels that hole bullet 3 is formed when projecting approximatively are in the same plane, and the stress between duct compares concentration, in pressure break
When can penetrate through first, form a covering of the fan channel, frac pressure can converge in this region, reboot fracturing fracture by three perforations
The covering of the fan direction that duct is first cracked is extended, and is realized the controllability in laterally main pressure-break face, is provided for pressure break transverse direction seam
Condition；It shoots hole I19 and shoots hole K21 with 6 degree of firing angles, opposite cloth bullet, phase angle is 0 degree, and the axial line for shooting hole J20 is vertical
In the central axes of frame body, the three launch hole ejection streams for being mounted on and shooting hole I19, shoot hole J20, shoot in the K21 of hole are intersected in one
Point forms a triangular wedge region after the perforation of perforation tunnel pressure break, the perforation that takes the lead in of zonule is frac pressure increase-volume and remittance
Poly- offer condition provides condition to realize the controllability in longitudinal main pressure-break face for pressure break longitudinal direction seam；Shoot hole F16, dress
Shell hole G17, to shoot tri- launch hole bullet of hole H18 be cluster is to determine face perforation, shoots hole I19, shoots hole J20, shoots the hair of hole K21 tri-
Perforating bullet is that cluster is three jet stream perforations；Every three launch holes bullet is cluster, 15 holes Kong Miwei/rice；The program be determine face perforation with
Three jet stream perforating modes are staggered, and having effectively achieved rock stratum, pressure break is cracked in length and breadth, realize seam net system near wellbore formation
It makes and builds.Such arrangement mode is suitable for compared with heat-bodied oil rock stratum perforation.Hole I19 is being shot, hole J20 is being shot, shoots and be provided in the K21 of hole
Perforation I221, perforation J222 and perforation K223 on one bullet support C22, bullet support C22 with shoot hole I19, shoot hole J20 and shoot
The angle in tri- holes hole K21 is identical with phase, and two holes perforation I221 and perforation K223 of two sides are on bullet support C with 6 ° of firing angles, phase
To cloth bullet, phase angle is 0 °, and the three launch hole ejection streams of perforation I221, perforation J222 and perforation K223 are intersected in a bit, is worn deeply
Beam orifice bullet 3, which is assemblied in, to be increased in bullet support C22, and bullet support C22 plays decrease and eliminates the charge interference work of deep penetrating charge 3
With.
Specific embodiment is as follows: this device cloth bullet mode is dextrad helical arrangement, and the phase angle between cluster and cluster is 0
Degree, that is, the phase angle for shooting hole C13 and shooting hole D14 and shooting hole H18 and shoot between the I19 of hole is 0 degree, each to shoot in hole
The bullet spacing of deep penetrating charge 3 be 62.7mm；Transverse crack face and Vertical Cracks face caused by perforation are criss-cross,
Construct criss-cross net seam system.
In perforating oil gas well construction, perforating bullet successively successively detonates, two adjoining launch hole bullets, previous launch hole bullet
The shock wave generated when detonation can be folded with the detonation wave of the second launch hole bullet and disturb, be in the second launch hole bullet cavity liner not right
In the pressure field of title, cavity liner crushes during crushing in asymmetry, reduces metal jet and forms quality, therefore reduces jet stream
Wear deep performance.It is charge interference that this detonation wave, which folds the process of disturbing,.Charge interference is the most important of reduction perforator performance
Reason to increase the action time of load wave, and makes to unload by will fill reinforcing fiber nylon material between perforator perforating bullet
Wave action time is greater than load wave action time, plays the role of slicing and elongates wavelength, wavelength, which increases velocity of wave, to be reduced, and phase is reduced
The pressure difference to be detonated around a launch hole bullet after adjacent two bullets, reduces the interference that previously detonation perforating bullet generates, improves perforating appliances
Perforation wears deep stability.The perforating system farthest realizes the perforation between rock gap, rock stratum, cross caused by perforation simultaneously
It is criss-cross to fracture surface and Vertical Cracks face, construct criss-cross net seam system, can in reservoir oil reservoir well section
It is interior to obtain maximum oil-collecting effect, the recovery ratio of oil gas is greatly improved, and by changing the medium between perforating bullet and perforating bullet, adopt
Weaken and eliminate charge interference with reinforcing fiber nylon bullet support.
In figure, description positional relationship only for illustration, should not be understood as the limitation to this patent；Obviously, this reality
It is merely examples for clearly illustrating the present invention with novel above-described embodiment, and is not to the utility model
Embodiment restriction.For those of ordinary skill in the art, it can also make on the basis of the above description
Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all practical new at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model right and wants within the spirit and principle of type
Within the protection scope asked.
Claims (6)
1. a kind of orthogonal net stitches pressure break perforating system, including gun body, it is characterised in that: gun body is the hollow cavity of both ends open,
Gun body one end is connect with priming adapter, and priming adapter is in contact with perforating system one end, and the perforating system other end is connect with final quotaion,
Final quotaion connect with disk is tensed, and is connect and is in contact in tension disk and gun breech, the gun body other end connect with gun breech or connect in passing through with it is next
Gun body connection is saved, the perforating system includes positioning disk, deep penetrating charge, reinforcing fiber nylon bullet support, laser cutting bullet
Frame and primacord, the positioning disk are in contact with priming adapter, and positioning disk is connect with laser cutting firing mount one end, are cut by laser
The firing mount other end is connect with final quotaion, is cut by laser inside firing mount and is equipped with reinforcing fiber nylon bullet support, in reinforcing fiber nylon bullet support
Portion is equipped with deep penetrating charge, and deep penetrating charge is connect with primacord.
2. orthogonal net according to claim 1 stitches pressure break perforating system, it is characterised in that: the deep penetrating charge packet
Body, silk pressing and groove are included, groove is equipped at the top of the body, trench interiors are equipped with primacord, are additionally provided with silk pressing on body.
3. orthogonal net according to claim 1 stitches pressure break perforating system, it is characterised in that: the laser cutting firing mount packet
Frame body and perforation cluster A are included, frame body is equipped with three groups of perforation cluster A；The reinforcing fiber nylon bullet support is made of three groups of bullet support A,
Bullet support A includes bullet support D and bullet support E.
4. orthogonal net according to claim 3 stitches pressure break perforating system, it is characterised in that: the perforation cluster A includes dress
Shell hole A, shoot hole B, shoot hole C, shoot hole D and shoot hole E, it is described shoot hole A and shoot hole C in opposite directions with 17 degree of firing angles and
120 degree of phase angle arrangements；Described shoots hole B to arrange perpendicular to frame body central axes；It is described to shoot hole D and shoot hole E phase
It is intersected in a bit to arranging and shooting hole D with 6 degree of firing angles and 0 degree of phase angle and shoot hole E jet stream；The bullet support D is equipped with
Perforation D and perforation E, the center line of the perforation D are overlapped with the center line for shooting hole D, the center line and dress of the perforation E
The center line of shell hole E is overlapped, and the bullet support E is equipped with perforation A, perforation B and perforation C, the center line and dress of the perforation A
Shell hole A center line is overlapped, and the center line of the perforation B is overlapped with hole B center line is shot, the center line of the perforation C and
Shoot the coincidence of hole C center line.
5. orthogonal net according to claim 1 stitches pressure break perforating system, it is characterised in that: the laser cutting firing mount packet
Frame body and perforation cluster B are included, frame body is equipped with three groups of perforation cluster B, and perforation cluster B includes perforation cluster C and perforation cluster D；The enhancing
Filled nylon bullet support is made of three groups of bullet support B, and bullet support B includes bullet support C and bullet support E.
6. orthogonal net according to claim 5 stitches pressure break perforating system, it is characterised in that: the perforation cluster C includes dress
Shell hole F, it shooting hole G and shoots hole H, described shooting hole F and shoot hole H is arranged in opposite directions with 17 degree of firing angles and 120 degree of phase angles,
Described shoots hole G to arrange perpendicular to the central axes of frame body；The perforation cluster D includes shooting hole I, shooting hole J and shoot
Hole K, it is described to shoot hole I and shoot hole K in opposite directions with 6 degree firing angles and 0 degree of phase angle arrangement, it is described shoot hole J with perpendicular to
The central axes of frame body arrange, described to shoot hole I, shoot hole J, shoot hole K jet stream and be intersected in a bit；It is set on the bullet support C
There are perforation I, perforation J and perforation K, the center line of the perforation I to be overlapped with the center line for shooting hole I, in the perforation J
Heart line is overlapped with the center line for shooting hole J, and the center line of the perforation K is overlapped with the center line for shooting hole K, the bullet support
E is equipped with perforation A, perforation B and perforation C, the center line of the perforation A are overlapped with the center line for shooting hole F, the perforation
The center line of B is overlapped with the center line for shooting hole G, and the center line of the perforation C is overlapped with the center line for shooting hole H.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820853527.2U CN208416506U (en) | 2018-06-05 | 2018-06-05 | Orthogonal net stitches pressure break perforating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820853527.2U CN208416506U (en) | 2018-06-05 | 2018-06-05 | Orthogonal net stitches pressure break perforating system |
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| CN208416506U true CN208416506U (en) | 2019-01-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108412470A (en) * | 2018-06-05 | 2018-08-17 | 大庆金祥寓科技有限公司 | Orthogonal net stitches pressure break perforating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108412470A (en) * | 2018-06-05 | 2018-08-17 | 大庆金祥寓科技有限公司 | Orthogonal net stitches pressure break perforating system |
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