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    Method to Estimate Cement Acoustic Wave Speeds from Data Acquired by A Cased Hole Ultrasonic Cement Evaluation Tool
    31.
    发明申请
    Method to Estimate Cement Acoustic Wave Speeds from Data Acquired by A Cased Hole Ultrasonic Cement Evaluation Tool 有权
    从套管孔超声波水泥评估工具获得的数据估算水泥声波速度的方法

    公开(公告)号：US20150218930A1

    公开(公告)日：2015-08-06

    申请号：US14612101

    申请日：2015-02-02

    Applicant: Schlumberger Technology Corporation

    Inventor： Smaine Zeroug ,  Jiaqi Yang ,  Sandip Bose

    IPC: E21B47/00 ,  G01V1/48

    CPC classification number: G01V1/50 ,  E21B47/0005 ,  E21B47/14

    Abstract: Embodiments of the disclosure may include systems and methods for estimating an acoustic property of an annulus in a cement evaluation system. In one embodiment, a casing arrival signal is acquired at acoustic receivers a cement evaluation tool. A spectral amplitude ratio is calculated based on the casing arrival signal. The spectral amplitude ratio is scanned to detect and identify discontinuities. If discontinuities are detected, the frequency at the discontinuity may be used to estimate a wavespeed of the annulus. If discontinuities are not detected, attenuation dispersions are calculated and estimated, and an estimated wavespeed and parameters are updated until the calculated and estimated attenuation dispersions match.

    Abstract translation: 本公开的实施例可以包括用于估计水泥评估系统中的环的声学特性的系统和方法。 在一个实施例中，在声学接收器处获取水泥评估工具的套管到达信号。 基于壳体到达信号计算频谱振幅比。 扫描光谱振幅比以检测和识别不连续性。 如果检测到不连续性，则可以使用不连续处的频率来估计环带的波速。 如果不检测到不连续性，则计算和估计衰减分散，并且估计的波速和参数被更新，直到计算和估计的衰减色散匹配。

    Methods for characterizing and evaluating well integrity using unsupervised machine learning of acoustic data
    32.
    发明授权
    Methods for characterizing and evaluating well integrity using unsupervised machine learning of acoustic data 有权

    公开(公告)号：US12140019B2

    公开(公告)日：2024-11-12

    申请号：US16973059

    申请日：2019-06-06

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Lingchen Zhu ,  Sandip Bose ,  Smaine Zeroug

    IPC: E21B47/107 ,  E21B47/002 ,  E21B47/005 ,  G01V1/48 ,  G06N3/045 ,  G06N3/047 ,  G06N3/08

    Abstract: Methods and systems are provided that characterize and evaluate well integrity of a cased well using unsupervised machine learning of acoustic data. Sonic waveform data for acoustic signals received by the receiver array of a sonic logging tool is collected and processed to determine a high-dimensional representation of the sonic waveform data. The high-dimensional representation is input to an unsupervised machine learning system to determine a low-dimensional representation of the sonic waveform data. A clustering method is applied to the low-dimensional representation to identify a set of clusters therein. At least one well integrity property of the depth interval of the cased well is determined based on the set of clusters. In embodiments, the at least one well integrity property can characterize cement condition in an annulus of the cased well as a function of azimuth and depth and can be used to evaluate cement integrity in a depth interval of the cased well.

    Guided mode beamforming for probing open-hole and cased-hole well environments
    36.
    发明授权
    Guided mode beamforming for probing open-hole and cased-hole well environments 有权

    公开(公告)号：US11531132B2

    公开(公告)日：2022-12-20

    申请号：US16495408

    申请日：2018-03-26

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

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

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

    Abstract: A method and downhole tool is provided that uses beamforming to localize acoustic energy at a desired zone-of-interest within a wellbore traversing a subterranean formation. The tool has an array of transmitter elements configured to emit guided mode acoustic signals at variable amplitude and variable time delay, which are individually controlled by an amplitude factor and time delay assigned to respective transmitter elements. A set of amplitude factors and time delays can be assigned to the transmitter elements of the transmitter array such that the transmitter elements produce a focused acoustic beam at the desired zone-of-interest by combination of guided mode acoustic signals transmitted by the transmitter elements.

    THROUGH TUBING NEAR-FIELD SONIC MEASUREMENTS TO MAP OUTER CASING ANNULAR CONTENT HETEROGENEITIES
    37.
    发明申请
    THROUGH TUBING NEAR-FIELD SONIC MEASUREMENTS TO MAP OUTER CASING ANNULAR CONTENT HETEROGENEITIES 有权

    公开(公告)号：US20220334284A1

    公开(公告)日：2022-10-20

    申请号：US17659913

    申请日：2022-04-20

    Applicant: Schlumberger Technology Corporation

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

    IPC: G01V1/50

    Abstract: Aspects described herein provide for methods and apparatus for characterizing azimuthal heterogeneities in a barrier installed outside an outer casing in a borehole traversing a formation in a cased hole configuration including an inner and outer casing. The approach is based on specific attributes in sonic signals acquired with an azimuthal and axial array receiver system located inside the inner casing. The methods include slowness-time-coherence (STC) processing based on specific arrivals identified in data acquired by axial arrays associated with multiple azimuthal sections of the receiver system. The specific arrivals contain STC signatures that can be examined in terms of coherence amplitude and localization within STC maps. Based on specific attributes in the sonic signals, an azimuthal coverage of the outer casing annular contents can be created.

    Method for determining properties of a thinly laminated formation by inversion of multisensor wellbore logging data
    38.
    发明授权
    Method for determining properties of a thinly laminated formation by inversion of multisensor wellbore logging data 有权

    公开(公告)号：US11422280B2

    公开(公告)日：2022-08-23

    申请号：US16612320

    申请日：2018-04-23

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Sushil Shetty ,  Qiwei Zhan ,  Lin Liang ,  Austin Boyd ,  Smaine Zeroug ,  Vanessa Simoes ,  Fabio Cesar Canesin

    IPC: G01V1/50 ,  E21B43/02 ,  E21B49/00 ,  E21B47/005

    Abstract: A method for determining properties of a laminated formation traversed by a well or wellbore employs measured sonic data, resistivity data, and density data for an interval-of-interest within the well or wellbore. A formation model that describe properties of the laminated formation at the interval-of-interest is derived from the measured sonic data, resistivity data, and density data for the interval-of-interest. The formation model represents the laminated formation at the interval-of-interest as first and second zones of different first and second rock types. The formation model is used to derive simulated sonic data, resistivity data, and density data for the interval-of-interest. The measured sonic data, resistivity data, and density data for the interval-of-interest and the simulated sonic data, resistivity data, and density data for the interval-of-interest are used to refine the formation model and determine properties of the formation at the interval-of-interest. The properties of the formation may be a radial profile for porosity, a radial profile for water saturation, a radial profile for gas saturation, radial profile of oil saturation, and radial profiles for pore shapes for the first and second zones (or rock types).

    Estimation of horizontal stresses and nonlinear constants in anisotropic formations such as interbedded carbonate layers in organic-shale reservoirs
    40.
    发明授权
    Estimation of horizontal stresses and nonlinear constants in anisotropic formations such as interbedded carbonate layers in organic-shale reservoirs 有权

    公开(公告)号：US11015443B2

    公开(公告)日：2021-05-25

    申请号：US16306688

    申请日：2017-05-31

    Applicant: Schlumberger Technology Corporation

    Inventor： Ting Lei ,  Smaine Zeroug ,  Bikash Kumar Sinha

    IPC: E21B49/00 ,  G01V1/30 ,  G01V1/46 ,  G01V1/50

    Abstract: Methods and systems are provided that identify relatively large anisotropic horizontal stresses in a formation based on (i) azimuthal variations in the compressional and shear slownesses or velocities of the formation measured from ultrasonic data acquired by at least one acoustic logging tool as well as (ii) cross-dipole dispersions of the formation measured from sonic data acquired by the at least one acoustic logging tool. In addition, the azimuthal variations in the compressional and shear slownesses or velocities of the formation and dipole flexural dispersions of the formation can be jointly inverted to obtain the elastic properties of the rock of the formation in terms of linear and nonlinear constants and the magnitude of maximum horizontal stress of the formation. A workflow for estimating the magnitude of the maximum horizontal stress can employ estimates of certain formation properties, such as overburden stress, magnitude of minimum horizontal stress, and pore pressure.

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