CTN™ Compensated Thermal Neutron Sensor

The CTN™ sensor 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. When combined with the ALD™ azimuthal lithodensity or QBAT™ or XBAT™ sonic sensors, the CTN tool logs can also be used to detect and evaluate gas-bearing formations, and to determine lithology and porosity in complex mineralogy formations.


  • Porosity measurement
  • Gas detection
  • Reservoir fluid typing
  • Lithology evaluation
  • Real-time evaluation
  • Wireline replacement

SOLAR™: this sensor also exists in the high temperature/high pressure version. Please refer to the SOLAR datasheet for details.

CTN™ Compensated Thermal Neutron Sensor

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Summary Summary LWD Log Interpretation Charts Sign in required
This document provides an insight into the sensitivity of LWD measurements to changes in the borehole environment and the impact that this has on the evaluation of a reservoir.
Summary Summary Oman: SOLAR Quad-Combo Saves 2-3 Days in HPHT wells Sign in required
In Oman, the operator of two high-temperature land gas wells wanted wireline-quality logs without the time and expense of wireline operations.
Summary Summary Kazakhstan: First Complete Wireline Replacement in Kazakhstan Sign in required
Explore alternative means to acquire the well information while reducing rig time and eliminating multiple logging runs.
Summary Summary Mexico: Sperry Drilling’s New Data Compression Software Facilitates Geosteering Within Thin Reservoir while Significantly Reducing Drilling Time Sign in required
In this shale gas well in the Eagle Ford play in Mexico, the primary objective was to drill a horizontal well with maximum lateral exposure within the 10 feet (3 meters) thick production zone. The challenge was to stay in the relatively thin shale pay zone while maintaining an aggressive rate of penetration.
Summary Summary U.K. Offshore: Operator Saves Significant Rig Time by Gathering Complete Formation Evaluation Data in Real Time Sign in required
In an offshore U.K. well, an operator needed to obtain a complete formation evaluation (FE) data set to measure reservoir and overburden characteristics in a deviated well.
Summary Summary Oman: Operator Proves Cost Savings With LWD High-Resolution Imaging Service Sign in required
Borehole imaging is one of the most rapidly advancing technologies in wireline logging and logging while drilling (LWD). In an onshore horizontal well in Oman, an operator needed more details of the geology in the reservoir in order to gain a better understanding of the distribution of faults, natural fractures, borehole breakouts, and drilling-induced fractures along the well path.
Summary Summary North Sea, Norway: Operator Successfully Runs 5 ¾-inch Slim-Hole Drilling Operation with Geo-Pilot® RSS System Sign in required
In a mature field on the Norwegian Continental Shelf of the North Sea, an operator had attempted twice to drill a new extended-reach drilling (ERD) wellbore with a 2.05 measured depth (MD) to true vertical depth (TVD) ratio that resulted in the bottomhole assembly (BHA) becoming lost in hole above the reservoir.
Summary Summary Mexico: Operator Saves Time USD 7.5 Million in Deepwater Rig Time by Acquiring Crucial Formation Evaluation Data in Real Time Sign in required
An operator on a deepwater well had recently issued an internal mandate seeking opportunities to reduce the authorizations for expenditure (AFEs) associated with drilling its oil and gas exploration and development projects.
Summary Summary CTN™ Compensated Thermal Neutron Sensor
Identifying Complex Lithologies and Gas
Summary Summary 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.
Summary Summary Logging-While-Drilling (LWD)
Halliburton delivers the highest quality borehole, early and accurate Logging-While-Drilling (LWD) formation evaluation, optimal wellbore placement, and maximum reservoir drainage. We continue to lead the industry with the widest array of MWD/LWD technologies.
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