(19)
(11) EP 1 039 095 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.04.2001 Bulletin 2001/15

(43) Date of publication A2:
27.09.2000 Bulletin 2000/39

(21) Application number: 00302231.6

(22) Date of filing: 20.03.2000
(51) International Patent Classification (IPC)7: E21B 10/26, E21B 10/56
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 19.03.1999 US 125119

(71) Applicant: Diamond Products International, Inc.
Houston, Texas 77060 (US)

(72) Inventors:
  • Fielder, Coy M.
    Cypress, Texas 77429 (US)
  • Silva, Rogerio H.
    Spring, Texas 77379 (US)

(74) Representative: Frankland, Nigel Howard et al
FORRESTER & BOEHMERT Franz-Joseph-Strasse 38
80801 München
80801 München (DE)

   


(54) Downhole drill bit


(57) A downhole tool has a body defining a proximal end for connection to a drill string and a distal end which defines a pilot section and an intermediate reamer section. Both the pilot and the reamer sections define cutting surfaces. The body defines a rotational diameter and a smaller pass-through diameter. Stabilizing means arc coupled to the body opposite either the reamer or the pilot section .






Search report