公开(公告)号：WO2018068147A1

公开(公告)日：2018-04-19

申请号：PCT/CA2017/051219

申请日：2017-10-13

Applicant: XACT DOWNHOLE TELEMETRY INC.

Inventor： XIAO, Xiaojun ,  VAN ZELM, John-peter ,  MCRORY, John Godfrey

IPC: E21B47/16 ,  E21B47/01 ,  H01L41/053

Abstract: A downhole acoustic transmitter has a piezoelectric transducer, an enclosure in which the piezoelectric transducer is housed, a transducer preload means which applies a selected compressive force against the transducer such that a mechanical preload is applied to the 5 transducer, and an acoustic tuning element which has a first end coupled to the transducer preload means or the transducer, and an open second end. The acoustic tuning element is not coupled to anything but the transducer preload means or transducer, so the transducer preload means effectively has a second open end and thus can maintain the same preload compressive force on the transducer even when the transmitter is subjected to tension and 10 compressive forces during operation.

Abstract translation: 井下声发射器具有压电换能器，封装有压电换能器的外壳，换能器预加载装置，该换能器预加载装置对换能器施加选定的压缩力，使得机械预加载施加到5 换能器，以及声学调谐元件，其具有耦合到换能器预加载装置或换能器的第一端和开放的第二端。 声学调谐元件除了换能器预加载装置或换能器之外没有任何耦合，因此换能器预加载装置有效地具有第二开放端并且因此即使在发射器受到张力时也可以在换能器上保持相同的预加载荷压缩力， 操作过程中的压缩力。

公开(公告)号：EP3526444A1

公开(公告)日：2019-08-21

申请号：EP17860078.9

申请日：2017-10-13

Applicant: Xact Downhole Telemetry, Inc.

Inventor： XIAO, Xiaojun ,  VAN ZELM, John-peter ,  MCRORY, John Godfrey

IPC: E21B47/16 ,  E21B47/01 ,  H01L41/053