SonicScopeThe Next Generation ofSonic While Drilling

Meretta QleiboLWD Petrophysics Domain Champion

2Agenda

Quadrupole: Why? and How?

Introduction to Sonic Scope

Local Example

Summary

3Why Multipole? Why SonicScope?

GoalProvide high data quality in real timeDeliver a robust compressional and shear measurement for all

formations, irrespective of mud type

Obtaining reliable compressional and shear providesPore pressure trendsBorehole stability analysisGas detection/saturationAdvanced drilling optimization/fracture gradientAdvanced formation evaluation

4From 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

5DipoleMonopole Quadrupole

Review of Borehole Acoustic Modes

6Dispersive Waves, Flexural and Quadrupole Modes

Slowness of the wave varies with frequency

Stoneley wave

Dipole flexuralwave

Quadrupole wave

Dipole flexuralDipole flexural QuadrupoleQuadrupole

7Why Quadrupole and Not Dipoles for LWD?

Wireline tool Drill Collar

Frequency

Wirelinetool flexural

Borehole flexural

Formation shear

No interference

Wireline dipole

Slow

ness

Collarflexural

StrongCoupling

LWD dipole

Slow

ness

Frequency

Fast collarflexural mode

Boreholeflexural mode

Boreholequadrupole

Collar quadrupole

Slow

ness

LWD quadrupole

8SonicScope 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

9Quadrupole Shear Inversion

Model-Based Inversion Dispersive approach Account for tool presence effect Tool Presence Tool equivalent model Includes all tool detailsQuadrupole Inversion MethodologyHomogeneous Isotropic modelTool equivalent modelMaximizing the semblance

Boreholequadrupole mode

Mode Search RZX Modeling

Note: Size of the dots indicate energy

Frequency (kHz)

Slow

ness

(us/f

t)

Shear value

Modeled Quadrupole Mode

Real Quadrupole Data

Slow

ness

(us/f

t)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

P SP

(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 monopoleFast

Formation

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 Comparison

Slow 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 Comparison

Slow 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