CS-CNLT Compensated Neutron Logging Tool is used to measure formation porosity in both open holes and cased holes. It employs two thermal neutron detectors positioned at different distances from the neutron source: the near detector is called the Short-Spacing (SS) detector, while the far detector is called the Long-Spacing (LS) detector.

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Technical Parameters

Maximum Temperature	400°F (204°C) for 2.0 hours 350°F (177°C) for 4.0 hours
Maximum Pressure	20,000 psi (137.9 MPa / 1406 kg/cm²)
OD	3⁵⁄₈ in (3.63 in / 92.1 mm)
Maximum Borehole Diameter	24 in (609.6 mm) (limited by eccentralizer)
Minimum Borehole Diameter	4.75 in (120.6 mm)
Overall Length	8 ft - 9.25 in (2.311 m)
Weight	150 lb (68.0 kg)
Maximum Logging Speed	30 ft/min (9.0 m/min)
Recommend Logging Speed	18 ft/min (6.0 m/min)
Measurement Range	3–100 p.u. (limestone porosity units)
Accuracy	Porosity <7 p.u.: ±0.5 p.u. Porosity >7 p.u.: ±7% of recorded value
Repeatability	±1.5 p.u. in 15% porosity limestone formation
Depth of Investigation	12 in (304.8 mm) (evaluated in 7.88 in/200 mm water-filled borehole at 15% porosity)
Vertical Resolution	28 in (711.2 mm)
Measurement Point	Short-Spacing: 2 ft - 1.0 in (635.0 mm) from bottom Long-Spacing: 2 ft - 6.0 in (762.0 mm) from bottom
Tensile Strength	120,000 lb
Compressive Strength	78,000 lb
Cable Requirement	7-conductor cable
Conductor Allocation	AC Power: Conductors 1 & 4 Signal: Mode 2 / Mode 5 (Conductors 2, 3, 5, 6)
Head Voltage	180 VAC @ 65 mA
Radiation Source	Am241-Be 4714XS 18 Ci (4.5 MeV neutron source)

Features

Compatible with the Atlas5700 series tools.
Suitable for open holes and cased holes.
Enhanced long-spacing count rate, reduced statistical uncertainty, decreased borehole salinity effects, and improved linear transformation.
Detectors and main electronic components are housed in a vacuum-insulated flask to ensure stable performance in high-temperature environments.