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