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  • SonicScope The Next Generation of Sonic 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?

    ─Goal Provide high data quality in real time

    Deliver a robust compressional and shear measurement for all formations, irrespective of mud type

    ─Obtaining reliable compressional and shear provides Pore 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

    2008 onwards

  • 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 flexural wave

    Quadrupole wave

    Dipole flexuralDipole flexural QuadrupoleQuadrupole

  • 7

    Why Quadrupole and Not Dipoles for LWD?

    Wireline tool Drill Collar

    Frequency

    Wireline tool flexural

    Borehole flexural

    Formation shear

    No interference

    Wireline dipole

    S lo

    w n

    es s

    Collar flexural

    Strong Coupling

    LWD dipole

    S lo

    w n

    es s

    Frequency

    Fast collar flexural mode

    Borehole flexural mode

    Borehole quadrupole

    Collar quadrupole

    S lo

    w n

    es s

    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

    Borehole quadrupole mode

    Mode Search  RZX Modeling

    Note: Size of the dots indicate energy

    Frequency (kHz)

    S lo

    w n

    es s

    (u s/

    ft )

    Shear value

    Modeled Quadrupole Mode

    Real Quadrupole Data

    S lo

    w n

    es s

    (u s/

    ft )

    Frequency (kHz)

    Shear value

    Model HI

    Measured Data

  • 10

    Local Data Review – SonicScope825

     North West Shelf well

     12 ¼” 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 to enable 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

    P S

    P

    (RT) DTCO, DTSM

    (RT)

  • 12

    Data analysis of high-frequency monopole

    P S

    Stoneley

    Slow Formation

    P St

    P S St

    P

    S

    St

    P

    St

    Fast Formation

  • 13

    Data analysis of high-frequency monopole

    Fast Formation

    Slow Formation

    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 Isotropic Quadrupole dispersion curve

  • 15

    LWD (RT)

    LWD (REC)

    WL

    • Comparison between SonicScope Real time, memory data, and Sonic Scanner log (Monopole only)

    • Memory data from SonicScope and Sonic Scanner show excellent agreement

    • Real Time data quality is as good as memory mode data

    • Shear data is available in Real Time from Monopole only (fast formations)

    Sonic Scanner Comparison Fast Formation, Monopole

  • 16

    • Comparison between SonicScope 825 Real time, memory data, and Sonic Scanner log (Monopole only)

    • Monopole data in slow formation will not give shear if Shear DT > Mud DT

    • Compressional from Monopole approaching mud DT requires Leaky-P processing

    LWD (RT)

    LWD (REC)

    WLSonic Scanner Comparison Slow Formation, Monopole

  • 17

    • SonicScope Quadrupole shear shows an excellent match to Sonic Scanner Dipole shear

    • Shear DT acquired up to 540 us/ft

    LWD Quadrupole

    WL DipoleSonic Scanner Comparison Slow Formation, Quadrupole

  • 18

    • Sonic Scope service is now available in 4.75” and 8.25” collars

    • Robust compressional delivered to client in real time

    • High quality waveforms enable data analysis and QC

    • Excellent Agreement between SonicScope and Wireline 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

    SonicScope�The Next Generation of �Sonic While Drilling Agenda Why Multipole? Why SonicScope? From Monopole to Multipole Review of Borehole Acoustic Modes Dispersive Waves, Flexural and Quadrupole Modes Why Quadrupole and Not Dipoles for LWD? Slide Number 8 Quadrupole Shear Inversion Local Data Review – SonicScope825 Real Time Operations Data analysis of high-frequency monopole Data analysis of high-frequency monopole Shear from Quadrupole Inversion Sonic Scanner Comparison�Fast Formation, Monopole Sonic Scanner Comparison�Slow Formation, Monopole Sonic Scanner Comparison�Slow Formation, Quadrupole Summary SonicScope