(19)
(11) EP 3 482 044 A1

(12)

(43) Date of publication:
15.05.2019 Bulletin 2019/20

(21) Application number: 17826717.5

(22) Date of filing: 07.07.2017
(51) International Patent Classification (IPC): 
E21B 47/14(2006.01)
(86) International application number:
PCT/CA2017/050823
(87) International publication number:
WO 2018/010015 (18.01.2018 Gazette 2018/03)
(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

(30) Priority: 11.07.2016 US 201662360717 P

(71) Applicant: Xact Downhole Telemetry, Inc.
Calgary, Alberta T2E 6Y4 (CA)

(72) Inventors:
  • XIAO, Xiaojun
    Calgary, Alberta T3L 1W2 (CA)
  • WHALEN, Dave
    St. Johns, Newfoundland and Labrador A1H 0G8 (CA)
  • VAN ZELM, John-Peter
    Calgary, Alberta T2L 1Z4 (CA)
  • MCRORY, John Godfrey
    Calgary, Alberta T2N 1P2 (CA)

(74) Representative: Brown, Alexander Edward et al
Venner Shipley LLP 200 Aldersgate
London EC1A 4HD
London EC1A 4HD (GB)

   


(54) METHOD AND APPARATUS FOR PRE-LOADING A PIEZOELECTRIC TRANSDUCER FOR DOWNHOLE ACOUSTIC COMMUNICATION