SonicScope The Next Generation of Sonic While Drilling ? SonicScope The Next Generation of ... Wireline

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    06-Jun-2018

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  • SonicScopeThe Next Generation ofSonic While Drilling

    Meretta Qleibo

    LWD Petrophysics Domain Champion

  • 2

    Agenda

    Quadrupole: Why? and How?

    Introduction to Sonic Scope

    Local Example

    Summary

  • 3

    Why Multipole? Why SonicScope?

    GoalProvide high data quality in real time

    Deliver a robust compressional and shear measurement for allformations, irrespective of mud type

    Obtaining reliable compressional and shear providesPore pressure trends

    Borehole stability analysis

    Gas detection/saturation

    Advanced drilling optimization/fracture gradient

    Advanced formation evaluation

  • 4

    From Monopole to Multipole

    SonicScope Multipole tool

    Vp & Vs in all formations

    Enhanced real-time delivery

    Stoneley

    sonicVISION Monopole tool

    Enhanced real-time delivery

    Vp & Vs in fast formations

    iSONIC First LWD sonic tool

    Monopole tool

    Vp only

    1996

    2004-2008

    2008onwards

  • 5

    DipoleMonopole Quadrupole

    Review of Borehole Acoustic Modes

  • 6

    Dispersive Waves, Flexural and Quadrupole Modes

    Slowness of the wave varies with frequency

    Stoneley wave

    Dipole flexuralwave

    Quadrupole wave

    Dipole flexuralDipole flexural QuadrupoleQuadrupole

  • 7

    Why Quadrupole and Not Dipoles for LWD?

    Wireline tool Drill Collar

    Frequency

    Wirelinetool flexural

    Borehole flexural

    Formation shear

    No interference

    Wireline dipole

    Slo

    wn

    ess

    Collarflexural

    StrongCoupling

    LWD dipole

    Slo

    wn

    ess

    Frequency

    Fast collarflexural mode

    Boreholeflexural mode

    Boreholequadrupole

    Collar quadrupole

    Slo

    wn

    ess

    LWD quadrupole

  • 8

    SonicScope 825 Key Technologies

    12 levels spaced at 90 degrees, 48 receivers total Industry best 4 inter-receiver spacing, aliasing completely eliminated Signal digitized at the receiver enables faster downhole processing 4 bulkheads vs. 28 for QBAT = stronger collar, simpler acoustic modeling

    High power to excite Quadrupole in slow formations Situated close to the receiver section to overcome attenuation

    Monopole collar arrival suppressed as low as possible I.D. optimized to separate QP propagation modes Enables Automatic Labeling, STC threshold

    Dual Layer Quadrupole Transmitter G42 Receiver Belts

    Screw on Centralizers Optimized Attenuation Section

    Ensure mode purity Wellsite Changeable Hard Faced

  • 9

    Quadrupole Shear Inversion

    Model-Based Inversion

    Dispersive approach

    Account for tool presence effect

    Tool Presence

    Tool equivalent model

    Includes all tool details

    Quadrupole Inversion Methodology

    Homogeneous Isotropic model

    Tool equivalent model

    Maximizing the semblance

    Boreholequadrupole mode

    Mode Search RZX Modeling

    Note: Size of the dots indicate energy

    Frequency (kHz)

    Slo

    wn

    ess

    (us/

    ft)

    Shear value

    Modeled Quadrupole Mode

    Real Quadrupole Data

    Slo

    wn

    ess

    (us/

    ft)

    Frequency (kHz)

    Shear value

    Model HI

    Measured Data

  • 10

    Local Data Review SonicScope825

    North West Shelf well

    12 hole section, near vertical

    Fast and slow formations

    Wireline logging suite included Sonic Scanner

  • 11

    Compressional delivered in real time

    Coherency plot and pumps off transmitted toenable QC of the data

    Pumps off test performed every stand

    Real time applications include seismic tie ins,pore pressure modeling and geomechanics

    Real Time Operations

    40 us/ft 240

    PS

    P

    (RT)DTCO, DTSM

    (RT)

  • 12

    Data analysis of high-frequency monopole

    PS

    Stoneley

    SlowFormation

    P St

    P S St

    P

    S

    St

    P

    St

    FastFormation

  • 13

    Data analysis of high-frequency monopole

    FastFormation

    SlowFormation

    P St

    P S St

    P

    S

    P

    St

    St

    P

    S

    St

    P

    St

    S

    P

  • 14

    Shear from Quadrupole Inversion

    Shear slowness

    Homogeneous IsotropicQuadrupole dispersion curve

  • 15

    LWD(RT)

    LWD(REC)

    WL

    Comparison between SonicScope Realtime, memory data, and Sonic Scannerlog (Monopole only)

    Memory data from SonicScope and SonicScanner show excellent agreement

    Real Time data quality is as good asmemory mode data

    Shear data is available in Real Time fromMonopole only (fast formations)

    Sonic Scanner ComparisonFast Formation, Monopole

  • 16

    Comparison between SonicScope 825Real time, memory data, and SonicScanner log (Monopole only)

    Monopole data in slow formation will not giveshear if Shear DT > Mud DT

    Compressional from Monopole approachingmud DT requires Leaky-P processing

    LWD(RT)

    LWD(REC)

    WLSonic Scanner ComparisonSlow Formation, Monopole

  • 17

    SonicScope Quadrupole shear shows anexcellent match to Sonic Scanner Dipoleshear

    Shear DT acquired up to 540 us/ft

    LWDQuadrupole

    WL DipoleSonic Scanner ComparisonSlow Formation, Quadrupole

  • 18

    Sonic Scope service is now available in 4.75 and8.25 collars

    Robust compressional delivered to client in real time

    High quality waveforms enable data analysis and QC

    Excellent Agreement between SonicScope andWireline Sonic Scanner

    Summary

  • 19

    SonicScope

    Latest Schlumberger Generation of Real-Time LWD Sonic

    High Quality Monopole Data

    Multipole Capability

    Available in 4.75 and 8.25 collars

    SonicScopeThe Next Generation of Sonic While DrillingAgendaWhy Multipole? Why SonicScope?From Monopole to MultipoleReview of Borehole Acoustic ModesDispersive Waves, Flexural and Quadrupole ModesWhy Quadrupole and Not Dipoles for LWD?Slide Number 8Quadrupole Shear InversionLocal Data Review SonicScope825Real Time OperationsData analysis of high-frequency monopoleData analysis of high-frequency monopoleShear from Quadrupole InversionSonic Scanner ComparisonFast Formation, MonopoleSonic Scanner ComparisonSlow Formation, MonopoleSonic Scanner ComparisonSlow Formation, QuadrupoleSummarySonicScope

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