Acoustic well logging with threshold adjustment
Patent
·
OSTI ID:6690437
Acoustic well-logging methods and apparatus are provided for investigating earth formations traversed by a borehole. Acoustic waves is transmitted from different points in the borehole and received at other points in the borehole, and a reception signal is generated representative of the received acoustic waves. The time interval between the instant the measurement waves is transmitted and the instant the instantaneous amplitude of the reception signal exceeds a given detection threshold for the first time is measured as a function of depth and the value of the detection threshold is adjusted during each measurement sequence in accordance with the amplitude of the noise received during the next preceding listening interval.
- Assignee:
- Schlumberger Technology Corp.
- Patent Number(s):
- US 4040001
- OSTI ID:
- 6690437
- Country of Publication:
- United States
- Language:
- English
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