EP1243890A1 - Hohlladung mit einer Einlage aus mit metalbeschichtetem Metallpulver hoher Dichte - Google Patents

Hohlladung mit einer Einlage aus mit metalbeschichtetem Metallpulver hoher Dichte Download PDF

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Publication number
EP1243890A1
EP1243890A1 EP01302669A EP01302669A EP1243890A1 EP 1243890 A1 EP1243890 A1 EP 1243890A1 EP 01302669 A EP01302669 A EP 01302669A EP 01302669 A EP01302669 A EP 01302669A EP 1243890 A1 EP1243890 A1 EP 1243890A1
Authority
EP
European Patent Office
Prior art keywords
metal
liner
perforator
tungsten
shaped charge
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Withdrawn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
EP01302669A
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English (en)
French (fr)
Inventor
David James Leidel
Jerry L. Walker
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.)
Halliburton Energy Services Inc
Original Assignee
Halliburton Energy Services 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 Halliburton Energy Services Inc filed Critical Halliburton Energy Services Inc
Priority to EP01302669A priority Critical patent/EP1243890A1/de
Publication of EP1243890A1 publication Critical patent/EP1243890A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/032—Shaped or hollow charges characterised by the material of the liner

Definitions

  • the present invention relates generally to explosive shaped charges and, in an embodiment described herein, more particularly provides an oilwell perforator having a metal coated high density metal powder liner.
  • Oilwell perforators are used to perforate casing or liner lining a wellbore, to thereby provide a path for production, or injection, of fluids therethrough.
  • deep penetrating oilwell perforators have liners made of partially sintered metal powder, or blends of various metal powders. If different metal powders are used, extreme care must be taken to prevent segregation of the different powders. This segregation may be due to different particle shapes, densities and sizes in the different powders. A liner made of segregated metal powders is undesirable because it will not form an appropriately shaped metal jet when the perforator is detonated.
  • a metal powder having a suitably high density for use in a deep penetrating perforator is made up of tungsten metal particles.
  • the tungsten particles in the powder are relatively hard, and so the particles do not readily adhere together when the powder is pressed into a liner shape.
  • the ability of a pressed metal powder to resist deformation prior to being partially or fully sintered is known as the "green" strength of the pressed powder.
  • a sufficiently high green strength is required for handling and other manufacturing processes.
  • a present solution to the problem of low green strength in liners made from tungsten powder is to blend the tungsten powder with other metal powders which, although they may be less desirable in some respects than tungsten for use in deep penetrating perforators, enhance the green strength of the pressed metal powder. Due to the presence of the other metal powders in the liner, segregation problems occur and the tungsten content of the liner is reduced to less than about 95% of the liner by weight.
  • a shaped charge which includes a liner formed from metal coated high density metal powder.
  • a method of using the shaped charge as a perforator in a well is also provided.
  • a perforator which has a liner formed of a metal powder wherein particles thereof are coated with another metal.
  • the metal powder may be tungsten and the metal coating may be, for example, copper, lead, molybdenum, tin, nickel or silver.
  • the metal coating enhances the green strength of the liner and significantly reduces the possibility of segregation of the metals as opposed to a mere blending of metal powders.
  • a perforator which has a liner formed of a tungsten powder wherein particles thereof are coated with a less dense metal. Nevertheless, the liner has an increased proportion of tungsten therein, and therefore has an increased density as compared to conventional liners with tungsten powder therein, and the metal coating permits the tungsten powder particles to be pressed into a liner shape with sufficient green strength.
  • FIG. 1 Representatively illustrated in FIG. 1 is a method 10 which embodies principles of the present invention.
  • directional terms such as “above”, “below”, “upper”, “lower”, etc., are used for convenience in referring to the accompanying drawings. Additionally, it is to be understood that the various embodiments of the present invention described herein may be utilized in various orientations, such as inclined, inverted, horizontal, vertical, etc., without departing from the principles of the present invention.
  • a perforating gun 12 is conveyed into a wellbore 16 and positioned opposite a formation or zone 14. As depicted in FIG. 1, the gun 12 is conveyed on a tubular string 18, but other conveyances, such as wireline, etc., may be used.
  • the perforating gun 12 is fired, detonating shaped charges known to those skilled in the art as perforators within the gun, and forming perforations 20 extending from the wellbore 16 and into the zone 14. Fluid may now be flowed between the wellbore 16 and the zone 14.
  • shaped charges may be used in wells to perforate tubing, provide detonation transfer between guns, etc.
  • a perforator 24 embodying principles of the present invention is representatively illustrated.
  • the perforator 24 may be used in the method 10 in the gun 12, or may be used in other methods. Additionally, aspects of the perforator 24 described herein may be incorporated into other types of shaped charges, without departing from the principles of the present invention.
  • the perforator 24 includes an outer case 26, an inner liner 28 and an explosive material 30 retained between the case and liner.
  • the liner 28 is formed from a fully or partially sintered metal coated high density pressed metal powder.
  • the metal powder may be tungsten, with particles thereof coated with one or more of copper, lead, molybdenum tin and silver.
  • FIG. 3 is representatively illustrated a metal powder particle 34 with a metal coating 36.
  • the liner 28 has a content by weight of approximately 95% to less than 100% tungsten.
  • the tungsten content by weight is greater than 90%, but less than 100%. This content of tungsten produces a liner which has enhanced performance in creating a metal jet that forms a deep perforation tunnel.
  • the present applicants have solved the problem of low green strength in high tungsten content pressed metal powders by coating the tungsten powder particles with relatively ductile metal, such as copper, lead, molybdenum, tin, silver, nickel etc.
  • relatively ductile metal such as copper, lead, molybdenum, tin, silver, nickel etc.
  • the metal coated metal powder adheres well when pressed and has a sufficient green strength for a perforator liner, even though it has a high tungsten content.
  • the present applicants have also solved the problem of segregation between metals in a powdered metal liner having more than one metal therein. Specifically, by providing the high density metal powder particles with a metal coating, the metals are unable to segregate due to their different shapes, densities, size, etc.
  • the powder metal particles in the liner 28 may be other than tungsten and may be a combination of metals
  • the metal coating may be other than copper, lead, molybdenum, tin, nickel or silver and may be a combination of metals. Additionally, it is not necessary for the metal coating to be less dense or more ductile as compared to the metal powder particles.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
EP01302669A 2001-03-22 2001-03-22 Hohlladung mit einer Einlage aus mit metalbeschichtetem Metallpulver hoher Dichte Withdrawn EP1243890A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01302669A EP1243890A1 (de) 2001-03-22 2001-03-22 Hohlladung mit einer Einlage aus mit metalbeschichtetem Metallpulver hoher Dichte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01302669A EP1243890A1 (de) 2001-03-22 2001-03-22 Hohlladung mit einer Einlage aus mit metalbeschichtetem Metallpulver hoher Dichte

Publications (1)

Publication Number Publication Date
EP1243890A1 true EP1243890A1 (de) 2002-09-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01302669A Withdrawn EP1243890A1 (de) 2001-03-22 2001-03-22 Hohlladung mit einer Einlage aus mit metalbeschichtetem Metallpulver hoher Dichte

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EP (1) EP1243890A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10309952B2 (en) 2014-08-28 2019-06-04 Hunting Titan, Inc. Synthetic target material for shaped charge performance evaluation, powdered metal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592790A (en) * 1981-02-20 1986-06-03 Globus Alfred R Method of making particulate uranium for shaped charge liners
US4613370A (en) * 1983-10-07 1986-09-23 Messerschmitt-Bolkow Blohm Gmbh Hollow charge, or plate charge, lining and method of forming a lining
DE3729780A1 (de) * 1987-09-05 1993-05-19 Battelle Institut E V Verfahren zur steigerung der eindringleistung von p-ladungen durch optimierung des werkstoffes der einlage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592790A (en) * 1981-02-20 1986-06-03 Globus Alfred R Method of making particulate uranium for shaped charge liners
US4613370A (en) * 1983-10-07 1986-09-23 Messerschmitt-Bolkow Blohm Gmbh Hollow charge, or plate charge, lining and method of forming a lining
DE3729780A1 (de) * 1987-09-05 1993-05-19 Battelle Institut E V Verfahren zur steigerung der eindringleistung von p-ladungen durch optimierung des werkstoffes der einlage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10309952B2 (en) 2014-08-28 2019-06-04 Hunting Titan, Inc. Synthetic target material for shaped charge performance evaluation, powdered metal
US12066423B2 (en) 2014-08-28 2024-08-20 Hunting Titan, Inc. Synthetic target material for shaped charge performance evaluation, powdered metal

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