Digital induction logging system including means for generating a plurality of transmitter frequencies
A digital induction resistivity logging system is disclosed for digitally measuring phase components in a receiver signal generated in response to eddy currents flowing in the earth's sub-surface formations. The induction logging system includes a central processing unit (CPU) located at the surface for receiving digital signals from a digital induction logging tool located downhole, and for analyzing the received data. The CPU supplies command and control signals to the induction logging tool to specify operating modes and parameters for obtaining the digital signals. The system further includes a digital telemetry system associated with a wireline cable for transmitting and receiving data between the induction tool and the CPU. The digital induction tool includes a digital sinewave generator for generating a highly phase stable, low distortion transmitter signal whose frequency is selectable from at least two of transmitter frequencies. Selection of the transmitter frequency may be based on optimizing the measurement of a characteristic of the formations being encountered by the tool. Automatic phase compensation is included to dynamically compensate for both static and dynamic temperature dependent phase errors due to circuits of the tool involved in the component measurements. A floating point analog-to-digital convertor capable of responding to the wide dynamic range in the detected phase component signals is provided to convert the phase detector output into digital signals for use by the CPU.
- Assignee:
- Schlumberger Technology Corporation
- Patent Number(s):
- US 4499421
- OSTI ID:
- 5418275
- Resource Relation:
- Patent File Date: Filed date 8 Jun 1981; Other Information: PAT-APPL-271275
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INDUCTION LOGGING
DATA PROCESSING
DIGITAL SYSTEMS
WELL LOGGING EQUIPMENT
RESISTIVITY LOGGING
ANALOG-TO-DIGITAL CONVERTERS
DATA TRANSMISSION SYSTEMS
RADIO EQUIPMENT
RESPONSE FUNCTIONS
TELEMETRY
COMMUNICATIONS
DATA TRANSMISSION
ELECTRIC LOGGING
ELECTRONIC EQUIPMENT
EQUIPMENT
FUNCTIONS
PROCESSING
WELL LOGGING
440400* - Well Logging Instrumentation