Density Imaging Service


The SureLogTM tool family includes the iDNSC*. The iDNSC tool provides a bulk density image along with traditional bulk density, neutron porosity and PE curves. Tool standoff and hole cali-per measurements are also provided by a pair of ultrasonic transducers which can also be used to environmentally correct the neutron porosity curve.

The iDNSC density imaging tool records data in an industry leading extra high density format on a large memory module to enable high quality well statistics for calculation of the bulk density curve and the bulk density image. The extra-high resolution imaging service extracts the detail contained in this large number of nuclear counts by a combination of various techniques providing clarity in 128 sectors, a feature not yet seen on other on density images.

The extra-high resolution images clearly reveal faults and fractures along with internal features of reservoir rocks more closely associated with high resolution wireline tools and microelectrode LWD imagers. A distinct advantage of the iDNSC tool over LWD micro-electrode type imagers is the ability to generate images in oil-based muds.

Applications of the extra-high resolution imaging tool include fault and fracture characterization, rock stress distribution, facies characterization and potential cleat and fracture characterization for optimum well placement in the reservoir, specifi cally in coal-bed-methane reservoirs.

The iDNSC tool can be confi gured to operate in drilling environments with temperatures to 350 degF [175 degC] and pressures to 25,000 psi [172.4] MPa.


HP/HT wells where temperatures to 350 deg [175 degC] and pressures to 25,000 psi [172.4 MPa] are reached††

Formation evaluation and petrophysical analysis

Bed boundary detection

Geosteering and well placement

Structural and stratigraphic dip analysis

Features & Benefits

  • Density measurement uses rugged scintillation detectors for accurate formation density and photoelectric index determination

  • Measurement quality factors are computed along with log data

  • Real-time 4, 8, or 16 sector images of compensated density, photoelectric index and standoff

  • Up to 64 sector images for memory data

  • Survey quality directional measurement

  • Borehole shape log and borehole breakout analysis

  • Dynamic standoff based density and neutron processing delivers high quality measurements even in enlarged boreholes

  • LWD industry first californium-252 source for neutron porosity

  • Enhanced analysis from three neutron detectors with the 43/4 -in system

  • Two ultrasonic transducers provide accurate standoff/caliper measurements

  • Both transducers are aligned with the density and neutron detectors for accurate dynamic standoff-based processing

  • New highly rugged ultrasonic pitchcatch transducers