Communications: electrical – Selective – Having electron beam device
Patent
1977-03-10
1978-10-31
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340 155BH, 340 17R, 181104, G01V 140
Patent
active
041237447
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 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.
REFERENCES:
patent: 3346068 (1967-10-01), Woods et al.
patent: 3496533 (1970-02-01), Semmelink
patent: 3614725 (1971-10-01), Moran
patent: 3732945 (1973-05-01), Lavigne
patent: 3916371 (1975-10-01), Broding
patent: 3961307 (1976-06-01), Hochheimer et al.
Birmiel Howard A.
Carpenter Bruce N.
Reens Louis H.
Schlumberger Technology Corporation
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