Communications: electrical – Selective – Interrogation response
Patent
1973-09-17
1976-12-14
Birmiel, Howard A.
Communications: electrical
Selective
Interrogation response
340 18LD, 73152, G01V 140
Patent
active
039978672
ABSTRACT:
In the representative embodiment of the present invention disclosed herein, a first ported or grooved signal-producing member is coaxially disposed within the apparatus for dividing drilling fluids flowing through the drill string into two or more longitudinally-directed streams or jets. A second ported or grooved signal-producing member is coaxially arranged in the apparatus adjacent to the first member and adapted for rotation in a transverse plane to cyclically obstruct the fluid jets for developing an alternating or cyclic acoustic signal of a desired frequency in the drilling fluid stream. To provide coded data signals for detection at the surface, an electric motor is coupled to the rotatable member by a unique coupling unit which is cooperatively arranged to be selectively operated by data-coded electrical signal as required to position the rotating member in selected angular orientations in relation to the non-rotating member for selectively varying the phase relationship of the acoustic output signal.
REFERENCES:
patent: 3789355 (1974-01-01), Patton
patent: 3792428 (1974-02-01), Harrel et al.
patent: 3792429 (1974-02-01), Patton et al.
Archambeau, Jr. Ernest R.
Birmiel Howard A.
Moore Stewart F.
Schlumberger Technology Corporation
Sherman William R.
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