In practice the sonic log data is not presented as a travel time, because different tools have different Tx-Rx spacings, so there would be an ambiguity. A sonic log that determines the top of the cement column and estimates the quality of the cement bond between the casing and the formation. SPE disclaims any and all liability for your use of such content. Sonic Log Porosity from Hunt-Raymer Method (curved lines) and Wyllie Method (straight lines) - Shale Corrections Are Required Before Using This Graph. Nuclear logging - PetroWiki. Counterclockwise rotation is … Sonic and density well log data are vital for geophysicists, petrophysicists, engineers and geologists in the search and evaluation of economic oil and gas reserves.

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Nor is the data presented as a velocity. The compressional sonic log can be used as a moderately good estimator of porosity in water and, to some degree, oil-filled rocks. Sonic logs, also known as sonic travel time logs or slowness logs, rely on the properties inherent in Snell's Law to propagate sound from a logging tool through the rock to receivers on the same logging tool. Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. Although the original paper does not discuss shale corrections, they are essential. Jump to navigation Jump to search. Jump to navigation Jump to search. A recording of the diameter changes in a well made by a tool with mechanical arms that touch the wellbore or a sonic signal … The data is presented as a slowness or the travel time per foot traveled through the formation, which is called delta t (∆t or∆T), and is usually measured inµs/ft.

PetroWiki. SPE disclaims any and all liability for your use of such content. Glossary:Cement bond log. More information.

Highlights; ... and petrophysicists need to describe a reservoir.

The direction of rotation of the subassembly controls the orientation of the transducer. Sonic logging is the recording of the time required for a sound wave to traverse a definite length of formation. PetroWiki. A sonic log that determines the top of the cement column and estimates the quality of the cement bond between the casing and the formation. The goal of log analysis is to map out the downhole values of reservoir characteristics chiefly as porosity, fluid saturations, and permeability. A sonic log that determines the top of the cement column and estimates the quality of the cement bond between the casing and the formation. Sonic logging has become routine, and the collection of compressional and shear velocities in fast and slow formations is more-or-less straightforward, particularly with the use of dipole sonic tools and waveform processing. Wiki Sonic The Hedgehog est un site communautaire auquel n’importe qui peut contribuer. Gas corrections similar to those used in the Wyllie method can be used if needed. Communication is likely if CBL>10% of unbonded mv reading.

Glossary:Caliper log. Search Petrowiki: Sonic logging. Works on transmission of a sound wave and identifies areas that conduct the wave and those that do not (free pipe ringing). Petrowiki March, 2020. A sonic log that determines the top of the cement column and estimates the quality of the cement bond between the casing and …

Découvrez, partagez et ajoutez ce que vous savez ! Gas corrections similar to those used in … Sonic Log Porosity from Hunt-Raymer Method (curved lines) and Wyllie Method (straight lines) - Shale Corrections Are Required Before Using This Graph. SONIC LOG BASICS The first sonic logs appeared in 1957. Method The two most frequently used methods of estimating porosity from sonic measurements are the Wyllie time average method and the Raymer-Hunt-Gardner field observation method. SPE disclaims any and all liability for your use of such content. The speed of sound in rock is governed by the physical properties embodied in the Wood-Biot-Gassmann Equations. Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. More information. Although the original paper does not discuss shale corrections, they are essential. There are many methods that can be used to calculate the porosity, the user may use density log, sonic log, neutron log, or combination between them, but the most common one is neutron-density log combination. The UBI imager’s sonde has a rotating transducer subassembly, which is available in different sizes to log all standard sizes of open boreholes. In many cases, however, the data are missing or need editing due to environmental effects such as sonic cycle skipping or density rugose hole and washout effects. Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. Sonic logging has become routine, and the collection of compressional and shear velocities in fast and slow formations is more-or-less straightforward, particularly with the use of dipole sonic tools and waveform processing.