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Compensated Neutron Sonde, CNS-IC

The CNS contains a radioactive source that bombards the formation with fast neutrons that are slowed down and then captured primarily by hydrogen atoms in the formation. The slowed neutrons been deflected back to the tool are counted by detectors. Since the tool responds primarily to the hydrogen content of the formation, the measurement is scaled in porosity units. The tool can be combined with other 530-series tools or subs through TCT and NEC.
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Common Electronic Circuit Section 1, NEC-IC

The main functions of NEC are the control, signal processing and communication for GRS, SGS, CNS, LDS and MFS; the control for HAS; the communication to surface acquisition system in conjunction with TCT.
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Hydraulic Pad-mounted Device, HAS-IC

The HAS, a hydraulic sidewall contact device, is used for the Combined Sonde of Micro-spherically Focused resistivity and Litho-Density measurements. The hydraulic device forces the Combined Logging Sonde of LDS and MFS to the sidewall during logging. It also provides a caliper for the correction of these pad-type logs.
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Combined Logging Sonde of Litho-Density and Micro-spherically Focused Logging

In conjunction with NEC and HAS, the Litho-density logs and the Micro-spherically Focused logs can be provided. The LDS uses a sonde-mounted gamma ray source (1.5Ci, Cs137) and two detectors to measure the bulk density and the effective photoelectric effect (Pe) of the formation. A caliper is also recorded. The tool uses two detectors to compensate the measurement result for the effects of mud cake and hole rugosity.
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