Borehole Size Monitoring

Measurements of borehole diameter are made using acoustic pulse-echo sensors. The sensors measure the transit time of acoustic waves between the sensor and the borehole wall and transmit the results to the surface in real time. The surface computer system uses this information to derive the corresponding stand-off distance and borehole diameter, based on the calculated acoustic velocity of the borehole fluid under downhole conditions. The acoustic sensors also record detailed data in memory, which is processed after the run to derive measures of borehole shape, ellipticity and ellipse orientation.

CTN™ Compensated Thermal Neutron Sensor
LWD neutron porosity tool provides accurate formation porosity, fluid typing and lithology (in combination with density). Larger tools also feature an acoustic caliper, used to correct the neutron porosity measurement for borehole effects and to provide measurements of borehole size.
XBAT™ Azimuthal Sonic and Ultrasonic LWD Service
LWD sonic tool with multipole transmitters and four azimuthal receiver arrays along with a 4-pinger acoustic caliper.

Borehole Size Monitoring

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