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：WO2018010015A1

公开(公告)日：2018-01-18

申请号：PCT/CA2017/050823

申请日：2017-07-07

Applicant: XACT DOWNHOLE TELEMETRY INC.

Inventor： XIAO, Xiaojun ,  WHALEN, Dave ,  VAN ZELM, J P ,  MCRORY, John Godfrey

IPC: E21B47/14

Abstract: 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.

Abstract translation: 井下声发射器具有预加载的压电换能器，其中容纳压电换能器的外壳，将换能器抵靠外壳的第一端联接器偏置的预加载弹簧，以及可调节的预加载 被安装到外壳的装置，使得选择的压缩力被施加到预加载弹簧，其继而促使换能器抵靠第一端联接器的面，使得机械预加载被施加到换能器。 可调节的预加载装置的位置和弹簧柔度被选择成使得施加到换能器的机械预载荷的水平补偿由于施加到发送器的变化的张力和压缩而导致的声学遥测发送器的预期挠曲量， 有效的预加载在换能器上。

公开(公告)号：EP3482044A1

公开(公告)日：2019-05-15

申请号：EP17826717.5

申请日：2017-07-07

Applicant: Xact Downhole Telemetry, Inc.

Inventor： XIAO, Xiaojun ,  WHALEN, Dave ,  VAN ZELM, John-Peter ,  MCRORY, John Godfrey

IPC: E21B47/14

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