Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1993-01-19
1995-01-17
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181106, 175 1, G01V 136, B21B 4702
Patent
active
053827600
ABSTRACT:
The seismic source (5) according to the invention is associated with a drill string (1) linking a drill bit to a surface installation close to the bit. It comprises a closed chamber (6) fastened inside a drill cellar (4) of the drill string. The section thereof is smaller than the inner section of the drill string, so as to allow free circulation of the drilling fluid. A reactive mass (8) may move within this chamber (6) and along the axis of drill string (1). Hydraulic or electro-mechanical means allow a strong alternating force of controlled frequency and duration to be applied to this mass. The energy necessary to the operating thereof is taken from the fluid current. This source requires no substantial modification in the usual drilling equipments. Drilling a well and performing seismic measurings may be achieved at the same time by means of the source by arranging sensors at the surface and/or in one or several adjacent wells.
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Laurent Jean
Staron Philippe
Institut Francais du Pe'trole
Moskowitz Nelson
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