公开(公告)号：US10995606B2

公开(公告)日：2021-05-04

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 Kalyanaraman ,  Erik Wielemaker

IPC: G01V1/28 ,  G01V1/46 ,  G01V1/50 ,  E21B47/00 ,  E21B47/005

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.

公开(公告)号：US10761064B2

公开(公告)日：2020-09-01

申请号：US15765460

申请日：2016-09-30

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Smaine Zeroug

IPC: G01N29/04 ,  G01N29/06 ,  G01N29/46

Abstract: Methods are provided for making, processing, and analyzing in situ measurements to indicate presence of thin bedding planes of weakness in a formation. Bedding planes as small as a few inches and smaller are identified using an ultrasonic borehole tool. In one embodiment, detected pseudo-Rayleigh waveforms are processed to determine whether multiple events are detected. If so, lamination and a likely bedding plane of weakness are identified. In another embodiment, a sonic borehole tool is run in conjunction with the ultrasonic borehole tool. Indications of shear and pseudo-shear wave speeds are compared, and where different, a bedding plane of weakness is identified. In another embodiment, a microresistivity imager is run with the ultrasonic borehole tool, and at locations where multiple events are not detected, the image obtained by the imager is inspected to find locations of sharp contrast with adjacent locations to thereby identify bedding planes of weakness.

公开(公告)号：US10705056B2

公开(公告)日：2020-07-07

申请号：US15575108

申请日：2016-05-18

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Ting Lei ,  Bikash Kumar Sinha ,  Smaine Zeroug

IPC: G01N29/44 ,  E21B47/00 ,  G01N29/04 ,  G01N29/265 ,  E21B47/14 ,  G01N29/07 ,  G01N29/11 ,  G01V1/50 ,  E21B33/14

Abstract: Methods are provided for identifying a cementation status of a multi-string cased wellbore utilizing sonic tools with monopole and/or dipole transmitters and with an array of sonic receivers axially displaced from the transmitter(s). The sonic tool is used to record waveforms. The waveforms are then processed to generate slowness and/or attenuation dispersions. The slowness and/or attenuation dispersions are projected onto a slowness and/or attenuation axis, and the results are compared to a data set of projected slowness and/or attenuation dispersions representing a plurality of different multi-string cased wellbore cement status scenarios in order to select the scenario most closely associated with the results. The presence or lack of eccentering of a casing is similarly obtained where the data set includes projected dispersions representing properly centered and ec-centered casings.

公开(公告)号：US10365405B2

公开(公告)日：2019-07-30

申请号：US15544187

申请日：2016-01-25

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Sushil Shetty ,  Lin Liang ,  Tarek M. Habashy ,  Vanessa Simoes ,  Austin Boyd ,  Bikash K. Sinha ,  Smaine Zeroug

IPC: G01V99/00 ,  G01V11/00 ,  G01N15/08

Abstract: A computer-implemented method is provided for determining properties of a formation traversed by a well or wellbore. A formation model describing formation properties at an interval-of-interest within the well or wellbore is derived from measured sonic data, resistivity data, and density data for the interval-of-interest. The formation model is used as input to a plurality of petrophysical transforms and corresponding tool response simulators that 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 by an inversion process to refine the formation model and determine properties of the formation at the interval-of-interest. In embodiments, properties of the formation may be radial profiles for porosity, water saturation, gas or oil saturation, or pore aspect ratio.

公开(公告)号：US10345465B2

公开(公告)日：2019-07-09

申请号：US15335797

申请日：2016-10-27

Applicant: Schlumberger Technology Corporation

Inventor： Mikhail Lemarenko ,  Christoph Klieber ,  Sylvain Thierry ,  Sandip Bose ,  Smaine Zeroug

IPC: G01V1/28 ,  G01V1/30 ,  G01V1/32 ,  G01V1/50 ,  E21B47/00 ,  E21B47/08

Abstract: Techniques involve obtaining acoustic data (including waves reflected from the casing, the annular fill material, the formation, and/or interfaces between any of the mud, the casing, and the annular fill material) from an acoustic logging tool. Techniques include normalizing the acoustic wave to result in a normalized wave having a comparable spectral shape with a reference wave, and comparing the normalized wave with the reference wave. The reference wave may be generated or modeled or produced from a look-up table or database, and may be estimated based on initial estimates of wellbore parameters. Based on the comparison of the normalized wave with the reference wave, a best-fit reference wave substantially matching the normalized wave may be identified. The best-fit reference wave may correspond with a thickness of the casing, an acoustic impedance of the annular fill material, and an acoustic impedance of mud.

公开(公告)号：US10138727B2

公开(公告)日：2018-11-27

申请号：US14170427

申请日：2014-01-31

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Smaine Zeroug ,  Bikash K. Sinha ,  Sandip Bose ,  Jiaqi Yang ,  Ting Lei ,  Ram Sunder Kalyanaraman

IPC: G01V1/40 ,  E21B49/00 ,  E21B47/00 ,  E21B47/14 ,  G01V1/50

Abstract: Apparatus and method for characterizing a barrier installed in a borehole traversing a formation including locating an acoustic tool with a receiver and a transmitter at a location in the borehole, activating the acoustic tool to form acoustic waveforms, wherein the receiver records the acoustic waveforms, and processing the waveforms to identify barrier parameters as a function of azimuth and depth along the borehole, wherein the waveforms comprise at least two of sonic signals, ultrasonic pulse-echo signals, and ultrasonic pitch-catch signals.

公开(公告)号：US09829597B2

公开(公告)日：2017-11-28

申请号：US14887653

申请日：2015-10-20

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Smaine Zeroug ,  Jiaqi Yang ,  Sandip Bose

IPC: G01V1/50 ,  E21B47/00

CPC classification number: G01V1/50 ,  E21B47/0005

Abstract: Techniques involve obtaining acoustic data from an acoustic logging tool, where the acoustic data includes waves reflected from the casing, the annular fill material, the formation, and/or interfaces between any of the casing, the annular fill material, and the formation. A crude casing thickness, tool position (e.g., eccentering), mud sound velocity may be estimated using the acoustic data. A specular reflection signal may also be estimated based on the acoustic data. A modeled waveform may be generated using the estimated specular reflection signal and one or more model parameters, such as an estimated crude casing thickness, an estimated tool position, an estimated sound velocity of mud between the acoustic logging tool and the casing, an estimated impedance of the annular fill material, and an estimated impedance of the mud. The modeled waveform may be calibrated in some embodiments. Furthermore, a casing thickness may be estimated by matching the modeled waveform with the corresponding measured acoustic data. The techniques may output one or more of a thickness of the casing, an apparent impedance of the annular fill material, and the impedance of mud.