Monitoring wellbore scale and corrosion

    公开(公告)号:US11796704B2

    公开(公告)日:2023-10-24

    申请号:US17190982

    申请日:2021-03-03

    CPC classification number: G01V1/50 E21B47/006 G01V1/523 E21B47/12

    Abstract: Some methods of scale and corrosion monitoring of a well include receiving information from a plurality of transducers disposed in a ring on a circumference of a tubing of the well, the received information including frequency domain information representing a first longitudinal ultrasonic wave and a first torsional ultrasonic wave to arrive at the plurality of transducers; determining arrival times for the first longitudinal ultrasonic wave and the first torsional ultrasonic wave to arrive at the plurality of transducers based on the received information; comparing the determined arrival times with a range of predetermined arrival times from a model that accounts for wave refraction using a ray tracing scheme to determine a wall thickness of the tubing, a scale thickness of scale within the tubing, and a scale shear wave velocity of the scale; and identifying a material of the scale based on the determined scale shear wave velocity.

    Adaptive stimulation system
    77.
    发明授权

    公开(公告)号:US09879507B2

    公开(公告)日:2018-01-30

    申请号:US15686334

    申请日:2017-08-25

    Abstract: Adaptive stimulation systems combine impulse-generated swept-frequency stimulation vibration with cyclically-varying hydraulic pressure to provide adaptive down-hole stimulation. Swept-frequency stimulation vibration arises from cyclical shifts of the power spectral density (PSD) of each stimulator's fluid interface vibration (via closed-loop control of the rebound cycle time and/or the fluid interface's effective elastic modulus). PSD's are adjusted for resonance excitation and fracturing of geologic materials at varying distances from a wellbore, closed-loop control incorporating backscatter vibration from stimulated geologic material. One or more stimulators generate vibration in bursts comprising a plurality of vibration frequencies. Timed signals from a programmable controller affect directional propagation of combined vibration wave fronts from a stimulator array. As fracturing proceeds to smaller (e.g., proppant-sized) fragments having higher resonant frequencies, PSD's are up-shifted, increasing relative stimulation vibration power in higher frequencies. Progressive stimulation is thereby optimized, facilitating plain-water (or liquefied propane) fracs with self-generated proppant.

    Active damping control of a wellbore logging tool

    公开(公告)号:US09739903B2

    公开(公告)日:2017-08-22

    申请号:US14913924

    申请日:2014-08-07

    CPC classification number: G01V1/40 E21B47/14 E21B49/00 G01V1/52 G01V1/523

    Abstract: Systems and methods for actively controlling the damping of a wellbore logging tool are disclosed herein. A wellbore logging tool system comprises a processor, a memory, a wellbore logging tool comprising an acoustic transmitter, and a logging tool control module. The logging tool control module is operable to receive sensor signals from one or more sensors coupled to the wellbore logging tool after an actuation control signal has been transmitted to the acoustic transmitter and determine, using the received sensor signals, one or more current dynamic states of the acoustic transmitter. The logging tool control module is also operable to determine a damping control signal based on the one or more current dynamic states of the acoustic transmitter and transmit the damping control signal to the acoustic transmitter of the wellbore logging tool.

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