(19)
(11) EP 2 899 360 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.04.2016 Bulletin 2016/17

(43) Date of publication A2:
29.07.2015 Bulletin 2015/31

(21) Application number: 15152253.9

(22) Date of filing: 23.01.2015
(51) International Patent Classification (IPC): 
E21B 10/00(2006.01)
C22C 29/08(2006.01)
 B22D 19/06(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 23.01.2014 US 201414162501

(71) Applicant: Varel Europe S.A.S.
64000 Pau (FR)

(72) Inventors:
  • THIGPEN, Gary M.
    Houston, TX Texas 77094 (US)
  • BELLIN, Federico
    Tomball, TX Texas 77375 (US)
  • AMUNDSEN, Marvin Windsor
    Houston, TX Texas 77095 (US)
  • THER, Olivier
    75012 Paris (FR)
  • DOURFAYE, Alfazazi
    75011 Paris (FR)
  • CUILLIER DE MAINDREVILLE, Bruno
    64000 Pau (FR)
  • GOMEZ, Williams
    65460 Bazet (FR)

(74) Representative: Neilson, Martin Mark et al
Urquhart-Dykes & Lord LLP Tower North Central Merrion Way
Leeds LS2 8PA
Leeds LS2 8PA (GB)

   


(54) Method for reducing intermetallic compounds in matrix bit bondline


(57) An apparatus and method for manufacturing a downhole tool that reduces failures occurring along a bondline between a cemented matrix coupled around a blank. The cemented matrix material is formed from a tungsten carbide powder, a shoulder powder, and a binder material, wherein at least one of the tungsten carbide powder or the shoulder powder is absent of any free tungsten. The blank, which optionally may be coated, is substantially cylindrically shaped and defines a channel extending from a top portion and through a bottom portion of the blank. The absence of free tungsten from at least one of the tungsten carbide powder or the shoulder powder reduces the reaction with iron from the blank, thereby allowing the control and reduction of intermetallic compounds thickness within the bondline.







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