4175 Stack Series Neutron Tool Subassembly 2009 All Rights Reserved-Century Wireline Services
This tool sub of the 4000 Stack Tools Series records the neutron porosity of the formation. The tool also records short and long neutron counts. It requires the use of the 4000 Stack Gamma Ray Tool Sub, which provides the needed telemetry, and is compatible with the 4239 Stack Density Tool Sub.   
FEATURES Properties Measured 1.   Neutron Detector, Far Spacing: He3 5.1 x 25.4 cm (2 x 10 in.)61cm (24 in.) spacing Offset (from top of Gamma Ray Tool Sub): 263.65 cm (103.8 in.) 2.   Neutron Detector, Near Spacing: He3 2.9 x 10.1 cm (1.125 x 4.0 in.) 32.4 cm (12.75 in.) spacing Offset:  291.08 cm (114.6 in.) 3.  Neutron Porosity: Neutron porosity offset: 297.18 cm (117in.) 4.   Radioactive Source: 5 Ci AmBe 241 neutron source, bullplug Offset: 320.14 cm (126.04 in.) Length: 194.1 cm (76.42 in.)  Temperature: 125 C (257 F) Diameter: 6.35 cm (2.5 in.)  Pressure: 350 kg/cm2 (5,000 psi) Weight: 28.8 kg (57 lb.)  Logging Speed: 9 m/min. (30 ft./min.) 
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