E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/00 (2006.01) E21B 44/00 (2006.01) E21B 47/00 (2006.01) G01H 15/00 (2006.01) G01V 1/40 (2006.01)
Patent
CA 2186402
A method for recording or logging measurements that are substantially comparable to the acoustic impedance of formations crossed through by a borehole. The measurements are obtained from an acceleration sensor (11) placed in the drill string (2) between a rock breaking tool (7) and mechanical decoupling means (12) arranged between some elements of the drill string. A measurement indicating the acoustic impedance of the formations is obtained by processing the sensor signal using a function of the tool rotation speed and the depth.
La présente invention concerne une méthode pour obtenir un enregistrement ou diagraphie de mesures sensiblement comparables à l'impédance acoustique des terrains traversés par le forage. Les mesures sont obtenues à partir de capteurs d'accélération (11) placé dans la garniture de forage (2) entre l'outil (7) de destruction de la roche et des moyens de découplage mécanique (12) disposés entre certains éléments de la garniture. On obtient une mesure representative de l'impédamce acoustique des terrains forés en traitant ledit signal par une fonction de la vitesse de rotation de l'outil et de la profondeur.
Guesnon Jean
Mabile Claude
Naville Charles
Institut Francais Du Petrole
Robic
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