(19)
(11) EP 3 390 758 A1

(12)

(43) Date of publication:
24.10.2018 Bulletin 2018/43

(21) Application number: 15910875.2

(22) Date of filing: 14.12.2015
(51) International Patent Classification (IPC): 
E21B 7/04(2006.01)
E21B 17/00(2006.01)
 E21B 7/06(2006.01)
E21B 47/02(2006.01)
(86) International application number:
PCT/US2015/065566
(87) International publication number:
WO 2017/105390 (22.06.2017 Gazette 2017/25)
(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
Designated Validation States:
MA MD

(71) Applicant: Halliburton Energy Services, Inc.
Houston, TX 77032 (US)

(72) Inventors:
  • SAMUEL, Robello
    Cypress TX 77433 (US)
  • ZHANG, Yuan
    Missouri City TX 77459 (US)

(74) Representative: Jennings, Michael John 
A.A. Thornton & Co. 10 Old Bailey
London EC4M 7NG
London EC4M 7NG (GB)

   


(54) DOGLEG SEVERITY ESTIMATOR FOR POINT-THE-BIT ROTARY STEERABLE SYSTEMS