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    ESTIMATING FORMATION STRESSES USING RADIAL PROFILES OF THREE SHEAR MODULI
    2.
    发明申请
    ESTIMATING FORMATION STRESSES USING RADIAL PROFILES OF THREE SHEAR MODULI 审中-公开
    使用三种剪切模式的径向轮廓估计形成应力

    公开(公告)号：US20150260870A1

    公开(公告)日：2015-09-17

    申请号：US14728357

    申请日：2015-06-02

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Bikash K. Sinha

    IPC: G01V1/50 ,  G01V1/28 ,  E21B49/00

    CPC classification number: G01V1/50 ,  E21B49/006 ,  G01V1/284 ,  G01V1/44 ,  G01V2210/62

    Abstract: Maximum and minimum horizontal stresses, and horizontal to overburden stress ratio, are estimated using radial profiles of shear moduli. Inversion enables estimation of maximum and minimum horizontal stresses using radial profiles of three shear moduli associated with an orthogonal set of axes defined by the three principal stress directions. Differences in the far-field shear moduli are inverted together with two difference equations obtained from the radial profiles of the dipole shear moduli C44 and C55, and borehole stresses in the near-wellbore region. The horizontal to overburden stress ratio is estimated using differences in the compressional, dipole shear, and Stoneley shear slownesses at two depths in the same lithology interval where the formation exhibits azimuthal isotropy in cross-dipole dispersions, implying that horizontal stresses are nearly the same at all azimuths. The overburden to horizontal stress ratio in a formation with axial heterogeneity may also be estimated using the far-field Stoneley shear modulus C66 and dipole shear modulus C55 together with the radial variation of the dipole shear modulus C55 caused by near-wellbore stress concentrations.

    Abstract translation: 使用剪切模量的径向轮廓来估计最大和最小水平应力以及水平与上覆岩层的应力比。 反转能够使用与由三个主应力方向定义的正交轴组相关联的三个剪切模量的径向轮廓来估计最大和最小水平应力。 远场剪切模量的差异与从偶极剪切模量C44和C55的径向轮廓获得的两个差分方程以及近井筒区域中的井眼应力一起反转。 在相同岩性间隔的两个深度处的压缩，偶极剪切和斯派利剪切速度的差异估计了水平到覆盖层应力比，其中形成在交叉偶极子分散体中呈现方位角各向同性，这意味着水平应力几乎相同 所有方位角 也可以使用远场Stoneley剪切模量C66和偶极剪切模量C55以及由近井眼应力集中引起的偶极剪切模量C55的径向变化来估计具有轴向异质性的地层中的覆盖层对水平应力比的影响。

    DETERMINING SHEAR SLOWNESS FROM DIPOLE SOURCE-BASED MEASUREMENTS ACQUIRED BY A LOGGING WHILE DRILLING ACOUSTIC MEASUREMENT TOOL
    3.
    发明申请
    DETERMINING SHEAR SLOWNESS FROM DIPOLE SOURCE-BASED MEASUREMENTS ACQUIRED BY A LOGGING WHILE DRILLING ACOUSTIC MEASUREMENT TOOL 有权

    公开(公告)号：US20210389487A1

    公开(公告)日：2021-12-16

    申请号：US17445956

    申请日：2021-08-26

    Applicant: Schlumberger Technology Corporation

    Inventor： Pu Wang ,  Sandip Bose ,  Bikash K. Sinha

    IPC: G01V1/28 ,  G01V1/50 ,  G01V1/32 ,  G01V1/30

    Abstract: A method for determining a shear slowness of a subterranean formation includes receiving waveforms data acquired by receivers in an acoustic measurement tool in response to energy emitted by at least one dipole source. The waveforms are processed to extract a formation flexural acoustic mode and a tool flexural acoustic mode. The processing includes transforming the time domain waveforms to frequency domain waveforms, processing the frequency domain waveforms with a Capon algorithm to compute a two-dimensional spectrum over a chosen range of group slowness and phase slowness values; and processing the two-dimensional spectrum to extract the multi-mode slowness dispersion. The method further includes selecting a plurality of slowness-frequency pairs from the formation flexural mode of the extracted multi-mode dispersion wherein each slowness-frequency pair comprises a slowness value at a corresponding frequency and processing the selected slowness frequency pairs to compute the shear slowness of the subterranean formation.

    Method for estimating anisotropic mechanical properties of a reservoir using sonic logging data
    5.
    发明授权
    Method for estimating anisotropic mechanical properties of a reservoir using sonic logging data 有权

    公开(公告)号：US10353094B2

    公开(公告)日：2019-07-16

    申请号：US15085982

    申请日：2016-03-30

    Applicant: Schlumberger Technology Corporation

    Inventor： Bikash K. Sinha

    IPC: G01V1/30 ,  G01V1/28 ,  G01V1/50

    Abstract: A method includes applying acoustic waves to the formation and detecting acoustic waves to acquire acoustic data. The method further includes determining (i) at least one of elastic constant C13 and elastic constant C23, (ii) elastic constant C33, (iii) at least one of elastic constant C44 and elastic constant C55, and (iv) elastic constant C66 using the acquired acoustic data. Elastic constant C11 is determined using elastic constant C33, at least one of elastic constant C44 and elastic constant C55, elastic constant C66, and a relationship between Thomsen parameter gamma and Thomsen parameter epsilon.

    Method for determining formation properties by inversion of multisensor wellbore logging data
    6.
    发明授权
    Method for determining formation properties by inversion of multisensor wellbore logging data 有权

    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.

    Method for Estimating Anisotropic Mechanical Properties of A Reservoir Using Sonic Logging Data
    8.
    发明申请
    Method for Estimating Anisotropic Mechanical Properties of A Reservoir Using Sonic Logging Data 审中-公开
    使用声波测井数据估算水库各向异性力学性质的方法

    公开(公告)号：US20160291181A1

    公开(公告)日：2016-10-06

    申请号：US15085982

    申请日：2016-03-30

    Applicant: Schlumberger Technology Corporation

    Inventor： Bikash K. Sinha

    IPC: G01V1/30 ,  G01V1/40

    CPC classification number: G01V1/306 ,  G01V1/284 ,  G01V1/50 ,  G01V2210/1299 ,  G01V2210/1429 ,  G01V2210/6242 ,  G01V2210/626

    Abstract: A method includes applying acoustic waves to the formation and detecting acoustic waves to acquire acoustic data. The method further includes determining (i) at least one of elastic constant C13 and elastic constant C23, (ii) elastic constant C33, (iii) at least one of elastic constant C44 and elastic constant C55, and (iv) elastic constant C66 using the acquired acoustic data. Elastic constant C11 is determined using elastic constant C33, at least one of elastic constant C44 and elastic constant C55, elastic constant C66, and a relationship between Thomsen parameter gamma and Thomsen parameter epsilon.

    Abstract translation: 一种方法包括将声波施加到形成和检测声波以获取声学数据。 该方法还包括确定（i）弹性常数C13和弹性常数C23中的至少一个，（ii）弹性常数C33，（iii）弹性常数C44和弹性常数C55中的至少一个，以及（iv）弹性常数C66，使用 获取的声学数据。 使用弹性常数C33，弹性常数C44和弹性常数C55，弹性常数C66中的至少一个以及Thomsen参数γ和Thomsen参数ε之间的关系来确定弹性常数C11。

    Multi-Frequency Inversion of Modal Dispersions for Estimating Formation Anisotropy Constants
    9.
    发明申请
    Multi-Frequency Inversion of Modal Dispersions for Estimating Formation Anisotropy Constants 有权
    用于估计形成各向异性常数的模态分散体的多频反转

    公开(公告)号：US20140369165A1

    公开(公告)日：2014-12-18

    申请号：US13916542

    申请日：2013-06-12

    Applicant: Schlumberger Technology Corporation

    Inventor： Bikash K. Sinha

    IPC: G01V1/30

    CPC classification number: G01V1/50 ,  G01V2210/6242

    Abstract: Systems and methods for the estimating a plurality of anisotropic elastic constants (Cij) using borehole dispersions and refracted compressional headwave velocity at a single logging depth in a vertical, deviated, or horizontal wellbore in a transversely-isotropic with a vertical axis of symmetry (“TIV”) formation. The estimated elastic constants can then be used to calculate near-wellbore stress distributions in the wellbore, which aids in an optimal completion design, such as for shale-gas production in the presence of shale heterogeneity.

    Abstract translation: 用于使用钻孔分散和垂直，偏斜或水平井筒中的单个测井深度处的折射压缩波头波速度估计多个各向异性弹性常数（Cij）的系统和方法，其垂直对称轴（“ TIV“）形成。 估计的弹性常数可以用于计算井眼中的近井筒应力分布，这有助于最佳的完井设计，例如在页岩异质性的情况下生产页岩气。

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