EP0160449A1 - Perforateur de puits pétrole à unités préfabriquées - Google Patents

Perforateur de puits pétrole à unités préfabriquées Download PDF

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Publication number
EP0160449A1
EP0160449A1 EP85302658A EP85302658A EP0160449A1 EP 0160449 A1 EP0160449 A1 EP 0160449A1 EP 85302658 A EP85302658 A EP 85302658A EP 85302658 A EP85302658 A EP 85302658A EP 0160449 A1 EP0160449 A1 EP 0160449A1
Authority
EP
European Patent Office
Prior art keywords
housing
gun
charge
gun according
booster
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85302658A
Other languages
German (de)
English (en)
Inventor
John Anthony Regalbuto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jet Research Center Inc
Original Assignee
Jet Research Center Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jet Research Center Inc filed Critical Jet Research Center Inc
Publication of EP0160449A1 publication Critical patent/EP0160449A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/116—Gun or shaped-charge perforators
    • E21B43/117—Shaped-charge perforators

Definitions

  • This invention relates to a modular perforating gun for use in a well bore.
  • detonating cord, electrical wires or other charge initiating means are strung from one gun to the next throughout the gun string.
  • initiating means may not be properly secured to the charges, and connections from one gun to another may be defective.
  • initiating means and housings may take a day or more, which delays the entire producing operation and therefore costs a substantial sum of money.
  • the guns of the present invention can employ only secondary explosives which are relatively insensitive to elevated temperatures, physical shock, or sparks.
  • a modular perforating gun for use in a well bore, comprising: tubular housing means; a plurality of shaped charges disposed in said housing means; charge initiation means including detonating cord means and acceptor charge means at the end of said detonating cord means proximate the top of said tubular housing means.
  • the tubular housing has gun ports therein covered by a wall of decreased thickness.
  • a charge holder loaded with shaped charges employing secondary explosive.
  • a detonating cord comprising secondary explosive connects all the charges.
  • At the top of the cord is a booster and a booster pellet acceptor charge.
  • At the bottom of the detonating cord is a small axially disposed downwardly aimed shaped donor charge.
  • the booster, booster pellet and donor charge all contain secondary explosive. Both the booster pellet at the top of the cord and the charge at the cord bottom are covered by cover plates to provide a dustproof, water- resistant chamber wherein the shaped charges are contained.
  • the top of the housing above the upper cover plate is internally threaded, while the bottom of the housing comprises a "nose" having external threads thereon, so that the bottom nose of one housing may be made up into the top of another, much as drill pipe is made up.
  • the donor charge of the one gun is placed in close proximity to the acceptor charge in the adjacent gun, there being only the two cover plates therebetween.
  • a firing sub including a shaped donor charge therein can then be made up to the-top of the uppermost gun, the firing sub also having an initiation system therein to initiate the donor charge.
  • Such initiation systems are well known in the art, and may employ actuation by impact of a drop bar, by pressure increase in tubing from which the gun string is disposed, electrical actuation, or other well known means.
  • a bull plug preferably having a disposable block of wood, cement, rubber or other material therein to absorb the explosive jet from the donor charge of the lowermost gun.
  • Perforating gun 10 comprises a tubular housing 20 substantially enclosed within an outer sleeve 22 of lesser wall thickness.
  • Housing 20 possesses apertures 24 through the wall thereof, which apertures 24 are covered by sleeve 22.
  • Apertures 24 serve as gun ports for the explosive jets emanating from shaped charges within gun 10.
  • 0-ring grooves 26 at the bottom of housing 20 carry 0-rings 28 which bear upon the interior wall of sleeve 22, effecting a fluid-tight seal between housing 20 and sleeve 22.
  • the bottom edge 23 of sleeve 22 abuts annular shoulder 21 on the exterior of housing 20.
  • Sleeve 20 is of substantially the same exterior diameter as housing 20 below shoulder 21, thereby providing a substantially uniform exterior for gun 10.
  • o-rings 28 are employed in the preferred embodiment, it should be understood that a seal may be effected between sleeve 22 and housing 20 by welding, brazing, adhesive bonding or other well known means.
  • Sleeve 22 extends beyond the upper end 30 of housing 20, the purpose for which will become apparent hereafter.
  • Sleeve 22 may be sized so that it will slide over housing 20, or may be sized for an interference fit, heated, inserted thereover and cooled.
  • securing sleeve 22 to housing 20 is not essential to the present invention, as will become more apparent hereafter.
  • a retaining means 40 which may comprise.a large o-ring, a circular spring, a split ring, or other well known retaining means.
  • Cover plate 38 seals the top of charge chamber 42, which is defined by chamber bore wall 44 of housing 20, chamber 42 extending to annular shoulder 46 at the bottom of wall 44.
  • the wall of housing 20 is of increased thickness and the bore wall 48 of lesser diameter, extending through the lower end of housing 20, which may also be referred to as nose 50.
  • Annular groove 52 opens into bore wall 48 proximate the end of nose 50.
  • the exterior of nose 50 at its upper end is of substantially the diameter as sleeve 22, and has annular shoulder 54 cut thereon, below which is cylindrical surface 56 of lesser diameter into which o-ring grooves 58 open. Grooves 58 carry 0-rings 60 therein.
  • shoulder 62 extends radially inwardly to external nose threads 64, which extend substantially.to the bottom 66 of nose 50.
  • shaped charges 70 are secured in charge holder 72, which may comprise a stamped sheet metal bracket, a cage made of wires, an extruded metal or plastic structure, or other constructions well known in the art.
  • Cover plate 38 may be an integral part of charge holder 72.
  • charges 70 are shown oriented at 120° intervals, the mouths 74 of charges 70 being aimed by charge holder 72 at apertures 24 when charge holder 72 is fully inserted into housing 20, annular edge 76 abutting shoulder 46.
  • the bottoms 78 of charges 70 are disposed substantially about the central axis of housing 20 in contact with detonating cord 80, which is disposed substantially on the axis of housing 20.
  • acceptor booster housing 82 At the top of cord 80 is acceptor booster housing 82, which may be welded, brazed or otherwise secured to top cover plate 38.
  • Booster housing 82 contains acceptor booster pellet 84, below which is booster 86, which is in contact with the upper end of detonating cord 80 clamped or otherwise secured by booster housing 82.
  • tension - spring 88 Also attached to cover plate is one end of tension - spring 88, the other end of which is secured to detonating cord 80 to maintain cord 80 in a substantially taut, nnsagging state.
  • donor booster housing 90 At the bottom of cord 80 is donor booster housing 90, which may be welded, brazed, riveted, screwed, bonded or otherwise secured to charge holder 72.
  • Donor booster housing 90 possesses an axial bore therethrough, in which a small shaped charge 92, referred to as a donor charge, is disposed.
  • the mouth of donor charge 92 is aimed downwardly, with a standoff gap 94 at the mouth thereof.
  • the lower end of detonating cord 80 is clamped or otherwise secured proximate booster 96.
  • bottom cover plate 98 Immediately below and adjacent to donor booster housing 90 is circular bottom cover plate 98, which may or may not be secured to housing 90.
  • expandable retainer ring 100 which snaps into annular recess 52.
  • Threads 32' on gun 10' are made up with threads 64 on the note 50 of gun 10, seals 60 effecting a fluid and pressure-tight seal between nose 50 of gun 10 and sleeve 22' of gun 10', the top end 25' of sleeve 22' abutting shoulder 54 of gun 10.
  • bull plug 16 At the bottom of gun 10' is bull plug 16, of substantially the same exterior diameter as the top end of nose 50'.
  • the upper interior wall 110 of bull plug 16 is cylindrical in configuration, and leads to inwardly downwardly extending oblique annular shoulder 112, from which internal threads 114 extend to the bottom 116 of bull plug 16.
  • cavity 118 At the center of bottom 116 is cavity 118, which may contain a block of metal, cement, rubber, wood or other material 120 to absorb the explosive jet of donor charge 92' of gun 10'. Seals 60' effect a fluid and pressure-tight seal between nose 50' of gun 10' and bull plug 16 when threads 64' are made up with threads 114.
  • firing sub 12 At the top of gun 10 is firing sub 12, which is secured by threads 122 on its lower end to threads 32-on housing 20. Above threads 122 is radially extending annular shoulder 124 above which cylindrical surface 126 extends upwardly to radially extending annular shoulder 128. Above shoulder 128, the exterior of firing sub 12 is of substantially the same diameter as sleeve 22. When gun 10 and firing sub 12 are made up together, seals 132 carried in grooves 130 on firing sub 12 create a pressure and fluid-tight seal, and upper end 25 of sleeve 22 abuts shoulder 126 of sub 12.
  • firing sub 30 comprises axial bore 134, at the bottom end of which is donor charge housing 90", donor charge 92", standoff gap 94", and booster 96", which are substantially identical to the similarly numbered components of gun 10.
  • Donor charge housing 90" clamps detonating cord 136, which runs upwardly in bore 134 to schematically shown firing head 138, at the top of which is booster pellet 140.
  • Firing head 138 may be designed to initiate booster pellet 140 by an explosive or non-explosive drop bar dropped down tubing string 14 from the surface, by a pressnre increase in tubing string 14, by electrical means, by a shaped donor charge lowered down the tubing string 14 on a wireline, or by other means known in the art.
  • Firing head 138 is retained in bore 134 by an expandable retaining ring 142, which snaps into annular groove 144 in the wall of bore 134.
  • 0-ring 146 seals between firing head 138 and the wall of bore 134.
  • Threads 148 on firing sub 12 engage threads 150 on tubing string 14.
  • Sub cover plate 152 held by retaining ring 154, covers the bottom of bore 134 below donor charge 92".
  • FIG. 2 of the drawings a second preferred embodiment of the present invention employing a slightly different structure is depicted.
  • Perforating gun 210 comprises a unitary tubular housing 220 having recesses 224 in the wall thereof, which recesses 224 serve as gun ports for the explosive jets emanating from shaped charges within gun 210.
  • housing 220 possesses annular sealing surface 229 on the interior thereof. Sealing surface 229 terminates at inwardly-extending radial shoulder 230, below which internal threads 232 are cut into the inner wall of housing 220. Below threads 230 is inwardly radially extending annular shoulder 234, below which is another, smaller diameter annular shoulder 236, shoulders 234 and 236 being formed in inwardly extending annular protrusion 231. Circular top cover plate 238 abuts shoulder 236, and is maintained in place by a retaining means 240, which may comprise a large 0-ring, a circular spring, a split ring, or other well known retaining means.
  • a retaining means 240 which may comprise a large 0-ring, a circular spring, a split ring, or other well known retaining means.
  • Cover plate 238 seals the top of charge chamber 242, which is defined by chamber bore wall 244 of housing 220, chamber 242 extending to annular shoulder 246 at the bottom of wall 244.
  • the wall of housing 220 is of increased thickness and the bore wall 248 of lesser diameter, extending through the lower end of housing 220, which may also be referred to as nose 250.
  • Annular groove 252 opens into bore wall 48 proximate the end of nose 250.
  • the exterior of nose 250 at its upper end is of substantially the diameter as the rest of housing 220, and has annular shoulder 254 thereon, below which is cylindrical surface 256 of lesser diameter into which O-ring grooves 258 open. Grooves 258 carry O-rings 260 therein.
  • shoulder 262 extends radially inwardly to external nose threads 264, which extend substantially to the bottom 266 of nose 250.
  • shaped charges 270 are secured in charge holder 272, which may comprise any construction known in the art.
  • Cover plate 238 may be an integral part of charge holder 272.
  • Charges 270 are shown oriented at 120° intervals, the mouths 274 of charges 270 being aimed by charge holder 272 at recesses 224 when charge holder 272 is fully inserted into housing 220, annular edge 276 abutting shoulder 246.
  • charges 270 may be oriented at 90°, 72°, 180° or any other suitable intervals.
  • the bottoms 278 of charges 270 are disposed substantially about the central axis of housing 220 in contact with detonating cord 280, which is disposed substantially on the axis of housing 220.
  • acceptor booster housing 282 At the top of cord 280 is acceptor booster housing 282, which may be welded, brazed or otherwise secured to top cover plate 238.
  • Booster housing 282 contains acceptor booster pellet 284, below which is booster 286, which is in contact with the upper end of detonating cord 280 clamped or otherwise secured by booster housing 282.
  • Donor booster housing 290 At the bottom of cord 280 is donor booster housing 290, which may be welded, brazed, riveted, screwed, bonded or otherwise secured to charge holder 272.
  • Donor booster housing 290 possesses an axial bore therethrough, in which a small shaped charge 292, referred to as a donor charge, is disposed.
  • the mouth of donor charge 292 is aimed downwardly, with a standoff gap 294 at the mouth thereof.
  • the lower end of detonating cord 280 is clamped or otherwise secured proximate booster 296.
  • bottom cover plate 298 Immediately below and adjacent to donor booster housing 290 is circular bottom cover plate 298, which may or may not be secured to booster housing 290.
  • expandable retainer ring 300 which snaps into annular recess 252.
  • a bull plug 16 Located below bottom cover plate 298 of perforating gun 210 is a bull plug 16, as previously described in FIG. 1B.
  • gun 210 At the top of gun 210 is the nose 250' of a second, substantially identical gun 210', guns 210 and 210' fitting together and operating together in the same manner as described with respect to guns 10 and 10'.
  • firing sub 12 as previously described in FIG. lA may be employed to initiate the shaped charges in guns 210 and 210'.
  • the explosives employed in shaped charges 70, 70' and 270; booster pellets 84, 84' and 284; boosters 86, 86', 286, 96, 96' and 296; detonating cords 80, 80', 280 and 136; and donor charges 92, 92' and 292 comprise secondary explosive.
  • firing head booster pellet 140 is to be initiated by a donor charge run downhole on a wireline, it too may comprise a secondary explosive.
  • the use of such an all- secondary-explosive perforating gun string possesses obvious safety advantages, particularly if booster pellet 140 is also of secondary explosive.
  • Generally utilized secondary explosives include any of a number of known explosive compounds, including but not limited to cyclotrimethylenetrinitramine, hexahydro-1,3,5-trinitro-5-triazine, cyclonite, hexogen, T4, commonly referred to as RDX; octogen, known as HMX; or 2,2',4,4',6,6'-hexanitrostilbene, known as HNS.
  • the perforating string is to be employed in a high temperature (above 500°F - 260°C) well bore, the explosive compound 2,6-bis(picrylamino)-3,5,dinitropyridine, known as PYX, may. be employed.
  • Another advantage of the perforating gun of the present invention is the ability to preload each gun in a clean, dry, well-lighted factory rather than at the well site.
  • the preloaded guns may then be transported to the well site, and made up together like drill pipe, there being no internal connections for the charge initiating means, even with respect to the firing sub at the top of the string.
  • This use of preloaded, sealed guns also prevents water, dust, mud and other debris from intruding on the interior of the guns, even in foul weather.
  • preloaded guns save considerable time at the well site, and, if needed, additional guns may be quickly secured from stock at the warehouse, camp, supply store or other distribution source.
  • the entire gun may be made to be disposed of after use, and may then be made of more inexpensive materials and construction than if the guns were to be reused several times.
  • Charge holder 72 way serve as a supporting structure for all internal components.
  • Bottom cover plate 98 and donor booster housing 90 may be integral with holder 72.
  • acceptor booster housing 82 and top cover plate 38 may be integral with holder 72.
  • shaped charges 70, booster pellet 84, booster 86, detonating cord 80, booster 96 and donor charge 92 may all be installed on charge holder 72, tension spring 88 affixed to cord 80, and charge holder 72 slid into housing 20.
  • Retaining ring 40 may then be placed over top cover plate 38, and ring 100 over bottom cover plate 98.
  • each vertical row of charges 70 is oriented toward its respective aperture 24; this may be ensured by employing any known spline or key means between housing 20 and charge holder 72.
  • Guns 10' and 210 may be assembled in a similar fashion.
  • booster pellet 140 of firing sub 12 is initiated by any of the aforementioned initiating means.
  • Pellet 140 in turn ignites detonating cord 136, which in turn initiates donor charge 92" through booster 96".
  • Booster pellet through booster 86, ignites detonating cord 80, which in turn initiates shaped charges 70.
  • booster 96 is actuated and initiates donor charge 92, which pierces bottom cover plate 100 of gun 10 and top cover plate 38' of gun 10'.
  • perforating guns of the present invention may be run in tandem, so as to obtain a gun string as long as is required to perforate the entire formation thickness.
  • a gun construction of the present invention not only is safety increased in connecting guns, but reliability of the explosive train transfer is enhanced through use of relatively short detonating cord lengths in conjunction with the larger donor, acceptor and booster charges, which eliminates the possibility of faulty cord connections between guns.
  • the guns may be secured together by fastening means other than threads; the O-rings may be carried inside the housing instead of on the nose; the charge bolder may be of different design and hold a greater or lesser number of charges on each plane; and others.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP85302658A 1984-04-27 1985-04-16 Perforateur de puits pétrole à unités préfabriquées Withdrawn EP0160449A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60500584A 1984-04-27 1984-04-27
US605005 1984-04-27

Publications (1)

Publication Number Publication Date
EP0160449A1 true EP0160449A1 (fr) 1985-11-06

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3108092A4 (fr) * 2014-05-23 2017-11-01 Hunting Titan Inc. Système d'alignement pour perforateur
WO2022084363A1 (fr) * 2020-10-20 2022-04-28 DynaEnergetics Europe GmbH Canon de perforation et ensemble d'alignement
US11339614B2 (en) 2020-03-31 2022-05-24 DynaEnergetics Europe GmbH Alignment sub and orienting sub adapter
US11480038B2 (en) 2019-12-17 2022-10-25 DynaEnergetics Europe GmbH Modular perforating gun system
US11499401B2 (en) 2021-02-04 2022-11-15 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load
US11525344B2 (en) 2018-07-17 2022-12-13 DynaEnergetics Europe GmbH Perforating gun module with monolithic shaped charge positioning device
US11713625B2 (en) 2021-03-03 2023-08-01 DynaEnergetics Europe GmbH Bulkhead
US11795791B2 (en) 2021-02-04 2023-10-24 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load
USD1010758S1 (en) 2019-02-11 2024-01-09 DynaEnergetics Europe GmbH Gun body
CN117684922A (zh) * 2023-11-29 2024-03-12 大庆金祥寓科技有限公司 模块化电缆定方位分簇射孔装置及射孔工艺
USD1019709S1 (en) 2019-02-11 2024-03-26 DynaEnergetics Europe GmbH Charge holder
US11988049B2 (en) 2020-03-31 2024-05-21 DynaEnergetics Europe GmbH Alignment sub and perforating gun assembly with alignment sub
RU2822181C1 (ru) * 2023-05-31 2024-07-03 Игорь Моисеевич Рафалович Кумулятивный перфоратор
USD1034879S1 (en) 2019-02-11 2024-07-09 DynaEnergetics Europe GmbH Gun body
US12091919B2 (en) 2021-03-03 2024-09-17 DynaEnergetics Europe GmbH Bulkhead

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020112983A1 (fr) * 2018-11-29 2020-06-04 Hunting Titan, Inc. Tandem de perforateurs prêt à l'emploi universel

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873675A (en) * 1953-06-17 1959-02-17 Borg Warner Method and apparatus for detonating explosive devices in bore holes
GB884104A (en) * 1959-05-15 1961-12-06 Jet Res Ct Inc Well perforating charge and apparatus
US3040659A (en) * 1958-05-12 1962-06-26 Otis J Mcculleugh Well perforating device
US3211093A (en) * 1962-08-10 1965-10-12 Mccullough Tool Company Expendible gun assembly for perforating wells
FR1584062A (fr) * 1967-08-02 1969-12-12
US4051907A (en) * 1976-03-10 1977-10-04 N L Industries, Inc. Selective firing system
FR2519784A1 (fr) * 1982-01-13 1983-07-18 Aerospatiale Dispositif de transmission multivoies d'un ordre pyrotechnique comportant un ensemble relais a relevement de pieces
US4484639A (en) * 1983-07-25 1984-11-27 Dresser Industries, Inc. Method and apparatus for perforating subsurface earth formations

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873675A (en) * 1953-06-17 1959-02-17 Borg Warner Method and apparatus for detonating explosive devices in bore holes
US3040659A (en) * 1958-05-12 1962-06-26 Otis J Mcculleugh Well perforating device
GB884104A (en) * 1959-05-15 1961-12-06 Jet Res Ct Inc Well perforating charge and apparatus
US3211093A (en) * 1962-08-10 1965-10-12 Mccullough Tool Company Expendible gun assembly for perforating wells
FR1584062A (fr) * 1967-08-02 1969-12-12
US4051907A (en) * 1976-03-10 1977-10-04 N L Industries, Inc. Selective firing system
FR2519784A1 (fr) * 1982-01-13 1983-07-18 Aerospatiale Dispositif de transmission multivoies d'un ordre pyrotechnique comportant un ensemble relais a relevement de pieces
US4484639A (en) * 1983-07-25 1984-11-27 Dresser Industries, Inc. Method and apparatus for perforating subsurface earth formations

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3108092A4 (fr) * 2014-05-23 2017-11-01 Hunting Titan Inc. Système d'alignement pour perforateur
US11525344B2 (en) 2018-07-17 2022-12-13 DynaEnergetics Europe GmbH Perforating gun module with monolithic shaped charge positioning device
USD1019709S1 (en) 2019-02-11 2024-03-26 DynaEnergetics Europe GmbH Charge holder
USD1034879S1 (en) 2019-02-11 2024-07-09 DynaEnergetics Europe GmbH Gun body
USD1010758S1 (en) 2019-02-11 2024-01-09 DynaEnergetics Europe GmbH Gun body
US11480038B2 (en) 2019-12-17 2022-10-25 DynaEnergetics Europe GmbH Modular perforating gun system
US11339614B2 (en) 2020-03-31 2022-05-24 DynaEnergetics Europe GmbH Alignment sub and orienting sub adapter
US11988049B2 (en) 2020-03-31 2024-05-21 DynaEnergetics Europe GmbH Alignment sub and perforating gun assembly with alignment sub
WO2022084363A1 (fr) * 2020-10-20 2022-04-28 DynaEnergetics Europe GmbH Canon de perforation et ensemble d'alignement
US11499401B2 (en) 2021-02-04 2022-11-15 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load
US11795791B2 (en) 2021-02-04 2023-10-24 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load
US11713625B2 (en) 2021-03-03 2023-08-01 DynaEnergetics Europe GmbH Bulkhead
US12091919B2 (en) 2021-03-03 2024-09-17 DynaEnergetics Europe GmbH Bulkhead
RU2822181C1 (ru) * 2023-05-31 2024-07-03 Игорь Моисеевич Рафалович Кумулятивный перфоратор
CN117684922A (zh) * 2023-11-29 2024-03-12 大庆金祥寓科技有限公司 模块化电缆定方位分簇射孔装置及射孔工艺
CN117684922B (zh) * 2023-11-29 2024-06-11 大庆金祥寓科技有限公司 模块化电缆定方位分簇射孔装置及射孔工艺

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Inventor name: REGALBUTO, JOHN ANTHONY