AIR LAYER FOR IMPROVED PERFORMANCE OF TRANSDUCER AT LOW FREQUENCIES

    公开(公告)号:WO2022265658A1

    公开(公告)日:2022-12-22

    申请号:PCT/US2021/039659

    申请日:2021-06-29

    Abstract: A Transducer in a downhole environment with an increased amplitude of the transducer output at lower frequencies. A transducer may include a bender bar, wherein the bender bar may include a first piezoelectric layer disposed on one surface of the bender bar, a second piezoelectric layer disposed on the opposite surface of the bender bar, and a metallic substrate disposed between the first piezoelectric layer and the second piezoelectric layer. The transducer may further include a first fixed end is attached to the bender bar and connects the bender bar to a base, a second fixed end opposite the first fixed end that attaches the bender bar to the base, and a compartment disposed within the base.

    DETERMINATION OF BOREHOLE SHAPE USING STANDOFF MEASUREMENTS

    公开(公告)号:WO2020117271A1

    公开(公告)日:2020-06-11

    申请号:PCT/US2018/064542

    申请日:2018-12-07

    Abstract: A downhole tool is placed in a borehole of a subsurface formation. The downhole tool comprises a plurality of calipers arranged around a circumference of the downhole tool. A plurality of standoff measurements is received for different rotation angles of the downhole tool, wherein each standoff measurement is indicative of a distance between one of the plurality of calipers and a wall of the borehole. A plurality of apparent diameters of the borehole is determined for the different rotation angles of the downhole tool based on the plurality of standoff measurements and a radius of the downhole tool. A probability function is determined based on the plurality of apparent diameters and at least one of a semiminor axis, semimajor axis, and ellipticity of the borehole is identified based on the probability function.

    ULTRASONIC TRANSDUCER WITH REDUCED BACKING REFLECTION

    公开(公告)号:WO2020005226A1

    公开(公告)日:2020-01-02

    申请号:PCT/US2018/039724

    申请日:2018-06-27

    Abstract: A well tool can be used in a wellbore that can measure characteristics of an object in the wellbore. The well tool includes an ultrasonic transducer for generating an ultrasonic wave in a medium of the wellbore. The ultrasonic transducer includes a front layer, a rear layer, backing material coupled to the rear layer, and piezoelectric material coupled to the front layer and to the backing material. The rear layer can improve signal-to-noise ratio of the transducer in applications such as imaging and caliper applications.

    RINGDOWN CONTROLLED DOWNHOLE TRANSDUCER
    9.
    发明申请

    公开(公告)号:WO2020251557A1

    公开(公告)日:2020-12-17

    申请号:PCT/US2019/036610

    申请日:2019-06-11

    Abstract: An apparatus and system for deploying an acoustic sensor are disclosed, in some embodiments, an acoustic sensor includes a transducer comprising a piezoelectric material layer having a front side from which the transducer is configured to transmit acoustic sensing signals and an opposing back side. A backing material layer comprising an acoustic damping material is coupled at a front side to the back side of the piezoelectric material layer. An acoustic reflector such as may comprise a cavity containing gaseous or liquid fluid is disposed between the front side and a back side of the backing material layer.

    ULTRASONIC ECHO LOCATING IN A WELLBORE USING TIME GAIN COMPENSATION

    公开(公告)号:WO2020018117A1

    公开(公告)日:2020-01-23

    申请号:PCT/US2018/043129

    申请日:2018-07-20

    Abstract: A sensor system may be used to measure characteristics of an object in a wellbore. The sensor system may include an ultrasonic transducer that generates an ultrasonic wave in a medium of the wellbore and detects a reflection signal of the ultrasonic wave off the object in the wellbore. The sensor system may also include a processing device and a memory device in which instructions are stored. The memory may include instructions that cause the processing device to receive the reflection signal from the ultrasonic transducer, and to truncate and preprocess the reflection signal to generate a truncated reflection signal. The instructions may also cause the processing device to apply time gain compensation to the truncated reflection signal and determine an echo wavelet from the time gain compensated signal representing an echo of the ultrasonic wave off of a wall of the wellbore.

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