(19)
(11) EP 2 692 982 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
09.04.2014 Bulletin 2014/15

(43) Date of publication:
05.02.2014 Bulletin 2014/06

(21) Application number: 13155472.7

(22) Date of filing: 15.02.2013
(51) International Patent Classification (IPC): 
E21B 10/32(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: 01.08.2012 EP 12305953

(71) Applicant: HALLIBURTON ENERGY SERVICES, INC.
Houston, TX 77072-5299 (US)

(72) Inventors:
  • Claudey, Eric Yves
    Bergen, 5006 (NO)
  • Talamini, Mariano
    Mons, 7021 (BE)
  • Mageren, Olivier
    Jette, 1090 (BE)
  • Schmitz, Alexandre
    Marcq, 7850 (BE)
  • Lindgrin, Martin
    Stavanger, 4006 (NO)
  • Moi, Stein Erik
    Hommersak, 4310 (NO)
  • Ravndal, Svein
    Figglo, 4332 (NO)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Near-bit borehole opener tool and method of reaming


(57) The present disclosure relates to a near-bit borehole opener (reamer) tool and a method of drilling a wellbore comprising: (a) disposing in the wellbore a tool string; (b) lowering and rotating the tool string and drilling a first portion of the wellbore having a first diameter with the drill bit, wherein at least one cutter assembly of a first borehole reamer is in a closed position; (c) reaming with a second borehole reamer a portion of the wellbore to a second diameter larger than the first diameter, wherein a rat hole portion of the wellbore is not reamed with the second borehole reamer, said rat hole portion of the wellbore having the first diameter; (d) extending the at least one cutter assembly of the first borehole reamer; and (e) concurrently rotating and moving the first borehole reamer up or down in the rat hole portion of the wellbore with the first diameter and abrading and cutting away the wellbore wall contacted by the at least one cutter assembly of the first borehole reamer assembly, thereby enlarging the diameter of a portion of the rat hole portion of the wellbore.