Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1990-08-23
1991-10-29
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
367 57, 367 79, 340858, 346 33WL, G01V 140, G01V 122
Patent
active
050620843
ABSTRACT:
A method and apparatus for acquiring acoustical data from a borehole and is especially useful in carrying out tomogrphy surveys. The borehole digital geophone (BDG) tool of the present invention is capable of operating from a standard, 7-conductor logging cable with no special cables being required since the individual digital geophone modules (DGM) which form the BDG tool are connected together by short, separate lengths of the same 7-conductor cable. Each DGM acquires, digitizes, stacks, and stores data generated by its own three-component geophone assembly prior to transmitting these signals to the surface over a dedicated conductor in the cable thereby substantially increasing the sample rate of the tool which, in turn, substantially reduces the field time to run a tomography survey.
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Brochure, "Bolt Wellseis System for Interwell Tomography", Bolt Technology Corp., Norwalk, Conn.
Bentley John W.
Schoepf Victor L.
Sidhwa Feroze J.
Hager Jr. George W.
McKillop Alexander J.
Mobil Oil Corporation
Moskowitz Nelson
Speciale Charles J.
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