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US 4,542,487 AGranted
Method and apparatus for shear wave logging
AssigneeConoco Inc.
InventorsWilliam M. Benzing, Waldo C. Patterson, Lawrence C. Cadle
Life of this patent
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Abstract
Apparatus for shear wave logging of formations adjacent a borehole wherein a tubular apparatus is specifically constructed for sympathetic movement with the borehole in response to low frequency horizontal shear waves. The apparatus consists of tubular frame structure with end members including housings for rigid seating of orthogonal pairs of horizontal wave detectors. Outer sleeve structure may be utilized for buoyancy adjustment.
Claims6
Apparatus for shear wave detection along a defined earth borehole, comprising:
- elongated cylindrical tube means of rigid material;
- logging cable means providing movable suspension of said tube means in said borehole;
- upper end cap means secured sealingly on one end of said tube means and being secured to said cable means;
- upper geophone housing means secured to said end cap means and extended into sealed seating within said tube means, said housing means having first and second transverse orthogonal bores formed in juxtaposition;
- lower end cone means secured sealingly on the opposite end of said tube means;
- lower geophone housing means secured to said end cone means and extended into sealed seating within said tube means, said housing means having third and fourth transverse orthogonal bores formed in juxtaposition;
- and
- a respective horizontal wave motion detector securely disposed in each of the first, second, third and fourth bores.
5 more elements
Dependencies are inferred from the claim text.