Apparatus for acoustically investigating a borehole
AssigneeSchlumberger Technology Corporation
InventorR. Mark Havira
Life of this patent
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Abstract
An apparatus is described for acoustically investigating a casing in a borehole with a source of acoustic energy that is directed at the reflecting surface of an acoustic reflector in front of which is an acoustically transparent window. The inclination of the window relative to the reflecting surface is selected to deflect secondary transmissions and thus reduce window produced interferences. Several embodiments are described.
Claims4
In an acoustic borehole investigating tool having an acoustic transducer for directing acoustic energy at a rotating reflector to acoustically investigate a radially remote wall with acoustic returns being reflected off the rotating reflector onto the acoustic transducer, the improvement comprising
- said tool being formed of upper and lower tool sections;
- an annular acoustically transparent window mounted to and between the upper and lower tool sections;
- a cylinder mounted for rotation about an axis to and inside the upper tool section and having sufficient axial length to internally bridge the annular transparent window and rotatably engage and structurally reinforce the lower tool section at the inside thereof, said cylinder having a tubular section with a side located opening radially opposite said annular transparent window, said tubular section commencing at the upper tool section and internally supporting said reflector radially opposite said side located opening to enable acoustic communication through the annular window.
Dependencies are inferred from the claim text.