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US 4,874,061 AGranted
Downhole orbital seismic source
AssigneeConoco Inc.
InventorJack H. Cole
Life of this patent
Estimating the term…
Abstract
Apparatus for simultaneously generating elliptically polarized seismic shear waves and compression waves downhole for coupling energy through the fluid into the borehole wall. The apparatus includes an elongate frame for support in the borehole and the frame includes a drive means energizable to impart an orbital motion to at least a portion of the frame thereby to generate an orbital shear wave.
Claims15
A downhole seismic source for the simultaneous generation of elliptically polarized shear wave seismic energy and compression wave seismic energy into a fluid-filled borehole wall comprising:
- an elongated cylindrical frame means immersible in said fluid-filled borehole, said frame means having a central axis and first and second ends and an outer wall supportable at a point along said borehole wall;
- means including a cable connected to said cylindrical frame means first end for supporting the frame means at selected positions along said borehole;
- and
- drive means disposed in said frame means in approximately equal spacing from the first and second ends and energizable to impart an eccentric orbital motion to at least a circumferal portion of the frame means outer wall thereby to generate an elliptically polarized shear wave in said borehole wall.
1 more element
Dependencies are inferred from the claim text.