Method and apparatus for dynamically investigating a borehole

Details Method and apparatus for dynamically investigating a borehole Method and apparatus for dynamically investigating a borehole

G - Physics

01

V

354/21, 349/6

G01V 1/28 (2006.01) G01V 1/46 (2006.01) G10K 11/34 (2006.01)

Patent

CA 1119283

Abstract An apparatus and method for investigating a borehole with energy transmissions whose directivity is varied in real time during the investigation is described. A plurality of transmitters are employed on a well logging tool with at least one receiver located ahead of the transmitters. The transmitters are repetatively activated to transmit a wave of energy to the receiver which produces a received wave. A parameter of the received wave is derived and used to vary the relative delay of activation of the transmitters to direct the beam of energy in a manner whereby the parameter is effectively enhanced for a subsequent investigation. A real time control is provided over the directivity of the energy transmissions to preferentially emphasize a particular segment of a received wave. An acoustic borehole investigation is described with which the detection of the travel time of a compressional wave or the peak value of a predetermined half cycle are optimized by controlling the directivity of the acoustic transmissions in real time. -1-

298586

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