Methods and apparatus for reducing interfering effects in measurement while drilling operations
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United States of America Patent
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-
Sep 8, 1987
Issued Date -
N/A
app pub date -
Jun 25, 1986
filing date -
Dec 5, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and methods of making measurements in a borehole while drilling by using a fluid circulation system having interfering pressure variations including the steps of measuring selected parameters at various depths in the borehole and generating in pressure changes indicative of the values of the measured parameters, producing signals representing a superposition of the generated pressure changes and the interfering pressure variations and utilizing the recurrence of the interfering pressure variations for deriving from the first signals resultant signals representing substantially the information carrying pressure changes.
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