The Neutron Logging provides accurate porosity, fluid type and lithology information for real-time decision making and wireline replacement applications. Porosity is computed from the near/far detector count rate ratio with robust environmental corrections applied for hole size, standoff, mud weight, mud salinity, formation salinity, pressure and temperature. In general Neutron tools are combined with the azimuthal litho-density tool, the Neutron tool logs can also be used to detect and evaluate gas-bearing formations, and to determine lithology and porosity in complex mineralogy formations.

The Litho-Density tool combines accurate density and photoelectric (Pe) measurements with azimuthal binning of data and an independent acoustic standoff sensor. These features not only provide density and Pe logs for petrophysical evaluation of the reservoir, but also valuable formation dip and borehole shape information for geosteering and hole quality applications.

Applications

Neuton Sensor:

Porosity measurement

Gas detection

Reservoir fluid typing

Lithology evaluation

Real-time evaluation

Wireline replacement

Density Sensor:

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.

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.

COTS can provide below tool assembly:

Neutron Density Integrated Sub(PD-150)