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METHOD AND APPARATUS FOR DYNAMICALLY INVESTIGATING A BOREHOLE
METHOD AND APPARATUS FOR DYNAMICALLY INVESTIGATING A BOREHOLE
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机译:动态研究井眼的方法和装置
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摘要
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 repetitively 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 borehold 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.
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