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US 9,982,526 B2Granted
Method and apparatus for spectral noise logging
AssigneesTgt Oil and Gas Services Fze, Sonogram LLC
InventorsDmitry Aleksandrovich Davydov, Artur Mikhailovich Aslanian
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Abstract
In the present invention that considerable advantage is to be gained in the provision of apparatus and methods for spectral noise logging that exhibit improved frequency resolution and thus sensitivity over those systems known in the art since this would allow for improved detection and characterization of fluid flow through, or behind, a casing of a well penetrating subsurface formations.
Claims15
A spectral noise logging (SNL) tool, said tool comprising:
- an acoustic detector configured to generate an electrical output signal;
- a first frequency channel comprising a first gain stage arranged to receive and amplify the electrical output signal to produce a first channel output in a first frequency range;
- a second frequency channel comprising a filter and a second gain stage arranged to receive, filter and amplify the electrical output signal to produce a second channel output in a second frequency range, wherein the first and second frequency channels are separate electrical paths producing separate channel outputs, and wherein the second frequency range is a subset of the first frequency range;
- an analogue to digital convertor configured to digitize the first and second channel outputs to produce first and second digitized outputs, respectively;
- a computer processing unit (CPU) configured to process the first and second digitized outputs from said analogue to digital convertor to generate a power frequency spectrum data set, wherein the power frequency spectrum data set comprises a frequency component from the first frequency channel in the first frequency range and a low frequency component from the second frequency channel in the second frequency range;
- and
- an internal memory configured to store said power frequency spectrum data set.
4 more elements
Dependencies are inferred from the claim text.