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    Cement acoustic properties from ultrasonic signal amplitude dispersions in cased wells
    4.
    发明授权
    Cement acoustic properties from ultrasonic signal amplitude dispersions in cased wells 有权
    水泥声学特性从超声信号振幅分散在套管井中

    公开(公告)号：US09534487B2

    公开(公告)日：2017-01-03

    申请号：US14157359

    申请日：2014-01-16

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Smaine Zeroug ,  Jiaqi Yang ,  Sandip Bose

    IPC: G01V1/50 ,  E21B47/00

    CPC classification number: E21B47/0005 ,  G01V1/50

    Abstract: Apparatus and methods for characterizing the physical state of a barrier installed in a borehole traversing a formation including locating an ultrasonic tool with a plurality of spaced receivers and a transmitter at a location in the borehole, activating the ultrasonic tool to form ultrasonic waveforms, wherein the spaced receivers record the ultrasonic waveforms, aligning the transmitter and the spaced receivers, wherein the ultrasonic waveforms comprise propagated Lamb modes, processing the ultrasonic waveforms to obtain a first amplitude dispersion plot of attenuation as a function of frequency and first phase dispersion plot of phase velocity as a function of frequency, processing attenuation dispersions to identify discontinuities, and relating the discontinuities to barrier wavespeeds.

    Abstract translation: 用于表征安装在穿过地层的钻孔中的屏障的物理状态的装置和方法，包括将具有多个间隔开的接收器的超声波工具和位于钻孔中的位置的发射器定位，启动超声波工具以形成超声波形，其中 间隔的接收器记录超声波波形，对准发射器和间隔的接收器，其中超声波波形包括传播的兰姆模式，处理超声波波形以获得作为频率的函数的衰减的第一振幅色散图和相速度的第一相位色散图 作为频率的函数，处理衰减分散以识别不连续性，以及将不连续性与屏障波速相关联。

    Guided mode beamforming for probing open-hole and cased-hole well environments
    5.
    发明授权
    Guided mode beamforming for probing open-hole and cased-hole well environments 有权

    公开(公告)号：US11899153B2

    公开(公告)日：2024-02-13

    申请号：US18065694

    申请日：2022-12-14

    Applicant: Schlumberger Technology Corporation

    Inventor： Yang Liu ,  Ralph D'Angelo ,  Smaine Zeroug ,  Sandip Bose

    IPC: G01V1/44 ,  E21B47/14 ,  E21B49/00 ,  E21B47/005 ,  E21B47/00

    CPC classification number: G01V1/44 ,  E21B47/00 ,  E21B47/005 ,  E21B47/14 ,  E21B49/00

    Abstract: A downhole tool including at least one transmitter, a receiver array, and a controller. Each receiver element of the receiver array is configured to apply variable amplification and a variable time delay to detected acoustic waveforms, wherein the variable amplification is controlled by an amplification factor assigned to the given receiver element, and wherein the variable time delay is controlled by a time delay assigned to the given receiver element. The controller assigns a set of amplification factors and time delays to the receiver elements of the receiver array and combines signals resulting from the application of the variable amplification and the variable time delay to the detected acoustic waveforms such that sensitivity of the receiver elements of the receiver array is focused at a desired zone-of-interest in a wellbore corresponding to the set of amplification factors and time delays assigned to the receiver elements of the receiver array.

    Sonic logging for assessing well integrity
    8.
    发明授权
    Sonic logging for assessing well integrity 有权

    公开(公告)号：US10577915B2

    公开(公告)日：2020-03-03

    申请号：US14157391

    申请日：2014-01-16

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Bikash K. Sinha ,  Ting Lei ,  Smaine Zeroug

    IPC: E21B47/00 ,  E21B47/10 ,  G01V1/44

    Abstract: Methods are disclosed for detecting fluid in at least one annulus around at least one casing installed in a borehole traversing a formation utilizing a sonic tool. The sonic tool is activated in the borehole and the received sonic waveforms are processed to obtain a dispersion plot. A reference dispersion plot is generated using a model of the borehole where the casing is well-bonded by cement. The obtained and reference dispersion plots are compared. An indication of fluid and in some cases, the specific radial location thereof is obtained based on the signature of the obtained plot as opposed to the reference plot. The methods are effective in doubly-cased boreholes using monopole and/or dipole sources.

    WELL INTEGRITY ANALYSIS USING SONIC MEASUREMENTS OVER DEPTH INTERVAL
    9.
    发明申请
    WELL INTEGRITY ANALYSIS USING SONIC MEASUREMENTS OVER DEPTH INTERVAL 审中-公开

    公开(公告)号：US20190055830A1

    公开(公告)日：2019-02-21

    申请号：US16080104

    申请日：2017-03-02

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Maja Skataric ,  Sandip Bose ,  Smaine Zeroug ,  Bikash Kumar Sinha ,  Ram Sunder Kalyanraman ,  Erik Wielemaker

    IPC: E21B47/00 ,  G01V1/28 ,  G01V1/46 ,  G01V1/50

    Abstract: Methods arc provided for using sonic tool data to investigate a multi-string wcllbore. The sonic data is processed to obtain indications of phase slowness dispersions for multiple locations in the wellbore. The dispersions are aggregated. The aggregated dispersions are compared with a plurality of cut-off mode templates to identify the presence of cut-off modes or the lack thereof in the aggregated phase slowness dispersions. Features of the multi-string wellbore are identified based on the presence of the cut-off modes or the lack thereof. In another method, the sonic data is processed to obtain indications as a function of depth of at least one of an energy spectrum, a semblance projection, a slowness dispersion projection, an attenuation dispersion projection, and a wavenumber dispersion projection. The indications are inspected to locate a shift at a particular depth indicat- ing a transition in at least oneannulus of the multi-string wellbore.

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