The Density Neutron Standoff Caliper MultiLink (DNSCM™) tool is one component of the PathFinder SM LWD MultiLink system.

Features

• Formation density and photoelectric index logs
• Neutron porosity log
• Borehole caliper log
• Dynamic standoff-based filter to remove standoff effects from density and neutron measurements
• Real-time transmission of computed log data
• Backup batteries that allow tool operation in the absence of turbine power
• Location anywhere in the LWD toolstring
• Securely mounted, nonretrievable nuclear sources

• High-capacity nonvolatile memory. At a drilling rate of 200 ft/hr, the tool can store over 100 hours of log data at 6-in. intervals.
• Backup power can be used for logging-while-tripping without mud circulation.
• High-speed log memory download minimizes rig time spent downloading data.

• Spectral density measurement uses rugged scintillation detectors for accurate formation density and photoelectric factor determination.
  Standoff-weighted data processing yields high-quality density measurements, even in out-of-gauge holes.
• Measurement quality factors are computed with log data.
• Clamp-on stabilizer minimizes tool standoff.

• Compensated neutron measurement uses rugged helium-3 detectors for high count rates and excellent repeatability, even in out-of-gauge holes.
• Independent compensations for tool standoff and borehole diameter improve the accuracy of neutron porosity determination.
  

Caliper/Standoff Sensor

• Ultrasonic time-of-flight measurement uses three piezoelectric transducers located at 120° intervals around the tool.
• One transducer is in line with the density and neutron detectors for accurate standoff compensation.
• Three transducers provide accurate caliper data in elliptical boreholes, even when the tool is eccentric and while the drillstring is not rotating.
• Data is acquired every 10 milliseconds and averaged.

• Wellsite-selectable and configurable log formats are available. Log quality and tool health indicators are plotted in addition to log data.
• Borehole and environmentally corrected logs can be produced on site.
• Pronto™ package provides quick-look formation evaluation.
• Halliburton's Desktop Petrophysics™ workstation provides a full range of formation evaluation services at Log Computing Center locations.