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Services > Wireline
Logging Services > Acoustic Services |
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Acoustic
Services |
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Acoustic
Services
- Multipole Array Acoustic log
- Borehole Compensated Acoustic log
- Cross Multipole array Acoustic log
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Multipole
Array Acoustic log
The multipole array acoustic log logging system
integrates a monopole acoustic array with a
dipole array using a low frequency acoustic source,
ensuring the complete acquisition of compressional
and shear data in both slow and fast formations
in a single logging pass. Each array has eight
receivers designed to measure a specific type
of signal, and each is configured with high-powered
transmitters, improving data quality in both
openhole and through-casing applications. The
MAC(LFDT*) dipole transmitters can be configured
for either in-line or crossed-dipole measurements.
The MAC(LFDT) raw data are processed to obtain
waveform amplitude, slowness, and arrival time
(At). These data are incorporated into advanced
log analysis programs to evaluate fractures
and lithology, fluid content, and rock properties.
Synthetic seismograms can be constructed to
correlate with surface-seismic data and calibrating
velocity checkshot surveys.
Applications
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- Seismic - construction of synthetic seismograms
and integration with surface-seismic and borehole-seismic
data
- Rock mechanical properties - prediction of
rock strength for frac stimulation or formation
sand production programs
- Permeability - derived from Stoneley-wave
attenuation
- Lithology - improved estimation of porosity
and lithology in slow formations
- Formation fluid properties - generation of
acoustic hydrocarbon indicators
- Anisotropy - acquisition of crossed-dipole
measurements and evaluation of vertical microfractures
and state of stress
- Cased hole - through-casing acquisition of
shear-wave (S-wave) and compressional-wave (P-wave)
data
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Borehole
Compensated Digital Array Acoustic log
The BHC Acoustic log presents measurement data
on the velocity of sound in formations penetrated
by the wellbore. The time interval between the
arrival of the acoustic pulses at finite-spaced
receivers in the instrument is measured and
recorded in units of microseconds per foot (or
microseconds per meter). Porosity can be calculated
when the value of the acoustic travel time of
the formation matrix is known. Signature or
VDL waveform presentations are optional. Good
correlation, particularly in low porosity formations,
and minimizing borehole effects in rugose holes
characterize the BHC Acoustilog.
Applications
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- Determine porosity in liquid-filled holes
- Obtain accurate porosity data in rugose boreholes
- Correlation
- Obtain formation velocity data
- Identify lithology when used with other porosity
devices
- Determine secondary porosity when used with
other primary porosity measuring devices
- Identify fractures from Signature or VDL waveform
presentation
- Determine formation strength parameters using
compressional and shear wave travel times obtained
from signature data
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Cross
Multi-pole Array Acoustilog
The cross multipole array acoustilog (XMAC*)
service acquires full-wave acoustic data for
compressional, shear, and Stoneley evaluations,
but significant design improvements have resulted
in a broader range of capabilities.
Applications
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- Provide monopole full waveform, dipole full
waveform, and cross- dipole full waveform
- Provide quality compressional, shear and Stoneley
wave as well as its velocity and amplitude
- Applicable in highly deviated and horizontal
wells with its acoustic system design
- Determination of porosity, lithology and
permeability
- Identify fracture orientation and formation
anisotropy
- Detect directly hydrocarbons in the formation
- Predict producibility of unconsolidated sandstone
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