Method for spatially filtering signals representing formation and channel echoes in a borehole environment
First Claim
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1. A method of characterizing interfaces formed between various materials in a cased borehole environment by spatially filtering a set of signals representing the various materials, comprising the steps of:
- introducing acoustic energy into the cased borehole environment from a transducer in the borehole;
receiving at least two spatially distinct signals as a collection of data values including echoes representing arrivals from interfaces formed between the various materials;
recording each signal in a spatial signal set;
applying a spatial filter to at least one data value in a first signal in the spatial signal set and at least one other data value in at least one other signal in the spatial signal set to separate a first echo from at least one other echo; and
providing a filtered spatial signal set.
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Abstract
A method and apparatus for spatially filtering a signal set to enhance interface echoes representing a borehole configuration. The spatial filtering technique provides information regarding the various interfaces formed between materials in the borehole environment, as well as thicknesses of the various materials present in the borehole. Further, the presence of channels formed during the cementing procedure are detected.
34 Citations
27 Claims
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1. A method of characterizing interfaces formed between various materials in a cased borehole environment by spatially filtering a set of signals representing the various materials, comprising the steps of:
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introducing acoustic energy into the cased borehole environment from a transducer in the borehole; receiving at least two spatially distinct signals as a collection of data values including echoes representing arrivals from interfaces formed between the various materials; recording each signal in a spatial signal set; applying a spatial filter to at least one data value in a first signal in the spatial signal set and at least one other data value in at least one other signal in the spatial signal set to separate a first echo from at least one other echo; and providing a filtered spatial signal set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification