Downhole seismic-sonic receiver

Details Downhole seismic-sonic receiver Downhole seismic-sonic receiver

2007-08-07

2007-08-07

Donovan, Lincoln (Department: 2837)

Acoustics

Geophysical or subsurface exploration

Seismic source and detector

C181S121000, C181S108000, C181S102000, C181S112000, C367S038000, C367S075000, C367S035000, C367S021000, C702S014000

Reexamination Certificate

active

11162505

ABSTRACT:
A downhole tool for gathering formation data from inside a borehole includes a substantially tubular housing adapted for axial connection to a drill string and multiple sensors coupled to the tubular housing. The sensors include a first pair of sensors aligned along a first axis and adapted to measure a spatial derivative along the first axis, a second pair of sensors aligned along a second axis and adapted to measure a spatial derivative along the second axis, and a third pair of sensors aligned along a third axis and adapted to measure a spatial derivative along the third axis. In selected embodiments, the spatial derivatives are used to differentiate seismic or sonic compression and shear waves measured in a downhole environment.

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