Loudness based method and system for determining relative location of an acoustic event along a channel

Registre Brevet USPTO
Numéro d'application 13958358
Numéro de brevet 09606250
Statut Délivré - en vigueur
Date de dépôt 2013-08-02
Date de la première publication 2014-02-06
Date de publication 2014-02-06
Date d'octroi 2017-03-28
Propriétaire Hifi Engineering Inc. (Canada)
Inventeur(s)
  • Hull, John
  • Jalilian, Seyed Ehsan
  • Cheuk, Philip

Abrégé

A method for determining relative location of an acoustic event along a channel such as a wellbore includes obtaining two acoustic signals at are obtained at two different and known depths in the wellbore, dividing the acoustic signals into windows, and determining the relative loudnesses of pairs of the windows. The power of the acoustic signals may be used as a proxy for the loudness of the acoustic event, and this determination can be made in the time or frequency domains. The relative depth of the acoustic event can then be determined relative to the two known depths from the relative loudnesses. The acoustic event may be, for example, casing vent flow, gas migration, a leak along a pipeline, or sounds observed in an observation well from a nearby well in which fracking is being performed.

Classes IPC  ?

  • G01N 29/07 - Analysing solids by measuring propagation velocity or propagation time of acoustic waves
  • G01N 29/11 - Analysing solids by measuring attenuation of acoustic waves
  • G01N 29/14 - Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
  • G01V 1/00 - Seismology; Seismic or acoustic prospecting or detecting
  • G01S 5/18 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
  • G01N 29/36 - Detecting the response signal
  • E21B 47/10 - Locating fluid leaks, intrusions or movements
  • G01V 1/28 - Processing seismic data, e.g. analysis, for interpretation, for correction
  • G01N 29/44 - Processing the detected response signal