Magnetic susceptibility well-logging unit with single power supply thermoregulation system

Patent · Tue Nov 05 00:00:00 EST 1985

OSTI ID:5736529

Seeley, R L

The magnetic susceptibility well-logging unit with single power supply thermoregulation system provides power from a single surface power supply over a well-logging cable to an integrated circuit voltage regulator system downhole. This voltage regulator system supplies regulated voltages to a temperature control system and also to a Maxwell bridge sensing unit which includes the solenoid of a magnetic susceptibility probe. The temperature control system is provided with power from the voltage regulator system and operates to permit one of several predetermined temperatures to be chosen, and then operates to maintain the solenoid of a magnetic susceptibility probe at this chosen temperature. The temperature control system responds to a temperature sensor mounted upon the probe solenoid to cause resistance heaters concentrically spaced from the probe solenoid to maintain the chosen temperature. A second temperature sensor on the probe solenoid provides a temperature signal to a temperature transmitting unit, which initially converts the sensed temperature to a representative voltage. This voltage is then converted to a representative current signal which is transmitted by current telemetry over the well logging cable to a surface electronic unit which then reconverts the current signal to a voltage signal.

• Assignee: The United States of America as represented by the Secretary of the Interior
• Patent Number(s): US 4551681
• OSTI ID: 5736529
• Resource Relation: Patent File Date: Filed date 2 May 1983; Other Information: PAT-APPL-490276
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
MWD SYSTEMS
WELL LOGGING EQUIPMENT
DESIGN
CABLES
INTEGRATED CIRCUITS
MAGNETIC SUSCEPTIBILITY
POWER SUPPLIES
PROBES
SOLENOIDS
TELEMETRY
TEMPERATURE CONTROL
VOLTAGE REGULATORS
COMMUNICATIONS
CONTROL
DATA TRANSMISSION
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
MAGNETIC PROPERTIES
MICROELECTRONIC CIRCUITS
PHYSICAL PROPERTIES
440400* - Well Logging Instrumentation