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Acoustic Logs
BestPractices Probes are constructed of low-velocity materials, producing the shortest travel path for the acoustic pulse through the borehole fluid and the adjacent rocks, which have a velocity faster than that of the fluid.  +
DataAcquisition Most acoustic-velocity probes employ magne
Most acoustic-velocity probes employ magnetorestrictive or piezoelectric transducers that convert electrical energy to acoustic energy. Most of the transducers are pulsed from 2 to 10 or more times per second, and the acoustic energy emitted has a frequency in the range of 20 to 35 kHz. Acoustic probes are centralized with bow springs or rubber fingers so the travel path to and from the rock will be of consistent length. Some of the energy moving through the rock is refracted back to the receivers. The receivers reconvert the acoustic energy to an electrical signal, which is transmitted up the cable. At the surface, the entire signal may be recorded digitally for acoustic waveform logging, or the transit time between two receivers may be recorded for velocity logging. Amplitude of portions of the acoustic wave also may be recorded; that technique is described later under waveform logging.
is described later under waveform logging.  +
EstimatedCostHighUSD 1,600 centUSD (0.016 kUSD, 1.6e-5 MUSD, 1.6e-8 TUSD)  +
EstimatedCostLowUSD 100 centUSD (0.001 kUSD, 1.0e-6 MUSD, 1.0e-9 TUSD)  +
EstimatedCostMedianUSD 462 centUSD (0.00462 kUSD, 4.62e-6 MUSD, 4.62e-9 TUSD)  +
EstimatedTimeHigh 0.0881 years (772.08 hours, 32.17 days, 4.596 weeks, 1.057 months)  +
EstimatedTimeLow 0.023 years (201.36 hours, 8.39 days, 1.199 weeks, 0.276 months)  +
EstimatedTimeMedian 0.044 years (385.92 hours, 16.08 days, 2.297 weeks, 0.528 months)  +
ExplorationCostPerMetric foot  +
ExplorationGroup Downhole Techniques +
ExplorationSubGroup Well Log Techniques +
ExplorationTimePerMetric job  +
FieldProcedures The geophysical/well logging service company conducts the down hole logging operation and produces both digital and hard copy logs. The Drilling contractor trips the drill pipe and bit and conditions the well bore for logging.  +
LithologyInfo determine porosity of layers  +
NEPAanalysis Well logging is a standard operation associated with the drilling permit approval and is included in the downhole analysis of the drilling program.  +
Name Acoustic Logs  +
OpenEI/PageDescription About Acoustic Logs, a geothermal exploration technique, including areas of use.  +
OpenEI/PageKeyword geothermal  + , exploration  + , techniques  + , Acoustic Logs  + , areas  +
Pitfalls An unstable well bore (sluffing, wash outs
An unstable well bore (sluffing, wash outs, etc) can be of concern in any well logging operation. In extreme condition, the loss of the logging tool down hole could possibly result in the loss of the hole and would require premature abandonment or the necessity to side track to complete the well drilling operation.
k to complete the well drilling operation.  +
References [http://www.epa.gov/esd/cmb/GeophysicsWebsite/pages/reference/methods/Borehole_Geophysical_Methods/Logging_Techniques_and_Tools/Acoustic_Logging.htm EPA-Environmental Geophysics-Geophysical Methods-Acoustic Logging]  +
StratInfo map discontinuities to determine their orientation.  +
TypeOf Well Log Techniques +
Has query
"Has query" is a predefined property that represents meta information (in form of a subobject) about individual queries and is provided by Semantic MediaWiki.
Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs + , Acoustic Logs +
Has processing error
"Has processing error" is a predefined property provided by Semantic MediaWiki and represents errors that appeared in connection with improper value annotations or input processing.
Acoustic Logs + , Acoustic Logs + , Acoustic Logs +
Categories Exploration Techniques , Geothermal , Acoustic Logs , Well Log Techniques
Modification date
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
20:42:44, 8 October 2013  +
hide properties that link here 
Acoustic Logs At Alum Area (Moos & Ronne, 2010) + , Acoustic Logs At Coso Geothermal Area (1977) + , Acoustic Logs At Coso Geothermal Area (2005) + , Acoustic Logs At Newberry Caldera Area (Combs, Et Al., 1999) + , Acoustic Logs At Raft River Geothermal Area (1979) + , Acoustic Logs At Steamboat Springs Area (Combs, Et Al., 1999) + , Acoustic Logs At The Needles Area (DOE GTP) + ExplorationTechnique
Cement Bond Log + , Cross-Dipole Acoustic Log + TypeOf
Acoustic Televiewer + redirect page
 
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