Acoustic logging based on wellbore resonance

doi:https://doi.org/10.2118/24686-PA

Title: Acoustic logging based on wellbore resonance

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Abstract

Wellbore resonance phenomena are the basis for a new acoustic logging method, the Stimulated Mode Acoustic Log (SMAL). The SMAL method stimulates a particular mode of wellbore vibration by exciting a resonance for that mode. Specific resonances are excited by driving an acoustic transmitter with a short tone burst of appropriate frequency. SMAL benefits include signal enhancement under adverse conditions, avoiding dispersion effects, propagating formation waves through cased and slotted liner completions, generating steady-state phase and amplitude data, and providing formation Q logs. All of these applications have arisen from studies of wellbore resonance phenomena through well logging and laboratory experiments. One means of study has been the wellbore excitation log, which shows the foot-by-foot response of the wellbore to swept-frequency excitation across the acoustic band. Excitation logs show that resonances are sensitive to lithology and formation saturation conditions. Additional insight has bene provided by generating standing waves under resonance conditions. This approach has led to a means of estimating a formation Q from the decay of standing tube waves. Q data, generated in this way, are consistent with laboratory data for core and quarry samples.

Authors:

Medlin, W L; Schmitt, D P ^[1]

Mobil R and D Corp., Dallas, TX (United States)

Publication Date:: 1996-06-01

Sponsoring Org.:: USDOE

OSTI Identifier:: 250832

Resource Type:: Journal Article

Journal Name:: SPE Formation Evaluation

Additional Journal Information:: Journal Volume: 11; Journal Issue: 2; Other Information: DN: Paper presented at the 1992 SPE Annual Technical Conference and Exhibition, Washington, DC (US), October 4--7; PBD: Jun 1996

Country of Publication:: United States

Language:: English

Subject:: 02 PETROLEUM; 03 NATURAL GAS; OIL WELLS; SONIC LOGGING; NATURAL GAS WELLS; DATA ANALYSIS; SOUND WAVES; WAVE PROPAGATION; TECHNOLOGY ASSESSMENT; RESPONSE FUNCTIONS

Citation Formats


                    Medlin, W L, and Schmitt, D P. Acoustic logging based on wellbore resonance.  United States: N. p., 1996. 
        Web.  doi:10.2118/24686-PA.

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                    Medlin, W L, & Schmitt, D P. Acoustic logging based on wellbore resonance.  United States.  https://doi.org/10.2118/24686-PA

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                    Medlin, W L, and Schmitt, D P. Sat .  
        "Acoustic logging based on wellbore resonance".  United States.  https://doi.org/10.2118/24686-PA.

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@article{osti_250832,

  title        = {Acoustic logging based on wellbore resonance},

  author       = {Medlin, W L and Schmitt, D P},

  abstractNote = {Wellbore resonance phenomena are the basis for a new acoustic logging method, the Stimulated Mode Acoustic Log (SMAL). The SMAL method stimulates a particular mode of wellbore vibration by exciting a resonance for that mode. Specific resonances are excited by driving an acoustic transmitter with a short tone burst of appropriate frequency. SMAL benefits include signal enhancement under adverse conditions, avoiding dispersion effects, propagating formation waves through cased and slotted liner completions, generating steady-state phase and amplitude data, and providing formation Q logs. All of these applications have arisen from studies of wellbore resonance phenomena through well logging and laboratory experiments. One means of study has been the wellbore excitation log, which shows the foot-by-foot response of the wellbore to swept-frequency excitation across the acoustic band. Excitation logs show that resonances are sensitive to lithology and formation saturation conditions. Additional insight has bene provided by generating standing waves under resonance conditions. This approach has led to a means of estimating a formation Q from the decay of standing tube waves. Q data, generated in this way, are consistent with laboratory data for core and quarry samples.},

  doi          = {10.2118/24686-PA},

  url          = {https://www.osti.gov/biblio/250832},
  journal      = {SPE Formation Evaluation},
number       = 2,

  volume       = 11,

  place        = {United States},

  year         = {1996},

  month        = {6}

}

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