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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