EP 3482044 A4 20200603 - METHOD AND APPARATUS FOR PRE-LOADING A PIEZOELECTRIC TRANSDUCER FOR DOWNHOLE ACOUSTIC COMMUNICATION
Title (en)
METHOD AND APPARATUS FOR PRE-LOADING A PIEZOELECTRIC TRANSDUCER FOR DOWNHOLE ACOUSTIC COMMUNICATION
Title (de)
VERFAHREN UND VORRICHTUNG ZUM VORSPANNEN EINES PIEZOELEKTRISCHEN WANDLERS FÜR AKUSTISCHE BOHRLOCHKOMMUNIKATION
Title (fr)
PROCÉDÉ ET APPAREIL DE PRÉCHARGE D'UN TRANSDUCTEUR PIÉZOÉLECTRIQUE POUR COMMUNICATION ACOUSTIQUE EN FOND DE TROU
Publication
Application
Priority
- US 201662360717 P 20160711
- CA 2017050823 W 20170707
Abstract (en)
[origin: WO2018010015A1] A downhole acoustic transmitter has a pre-loaded piezoelectric transducer, an enclosure in which the piezoelectric transducer is housed, a preload spring that biases the transducer against a first end coupling of the enclosure, and an adjustable preload means mounted to the enclosure such that a selected compressive force is applied to the preload spring, which in turn urges the transducer against a face of the first end coupling such that a mechanical preload is applied to the transducer. The position of the adjustable preload means and the spring compliance are selected so that the level of mechanical preload applied to the transducer compensates for an expected amount of flexing of the acoustic telemetry transmitter due to varying tension and compression applied to the transmitter, thereby maintaining an effective preload on the transducer.
IPC 8 full level
E21B 47/14 (2006.01); E21B 47/16 (2006.01)
CPC (source: EP US)
E21B 47/16 (2013.01 - EP US); E21B 47/26 (2020.05 - EP US)
Citation (search report)
- [XI] US 6137747 A 20001024 - SHAH VIMAL V [US], et al
- [A] WO 2015156768 A1 20151015 - KYLE DONALD [US], et al
- [A] US 5274606 A 19931228 - DRUMHELLER DOUGLAS S [US], et al
- [A] US 3992694 A 19761116 - EHRLICH STANLEY L
- [A] US 4129850 A 19781212 - MUMPER J [US]
- [A] US 2008316866 A1 20081225 - GOODEMOTE JOHN H [US], et al
- See references of WO 2018010015A1
Designated contracting state (EPC)
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
DOCDB simple family (publication)
WO 2018010015 A1 20180118; CA 3030368 A1 20180118; EP 3482044 A1 20190515; EP 3482044 A4 20200603; EP 3482044 B1 20230830; US 2019301280 A1 20191003
DOCDB simple family (application)
CA 2017050823 W 20170707; CA 3030368 A 20170707; EP 17826717 A 20170707; US 201716316848 A 20170707