The Series 4239 Stacked Photoelectric Density Tool Sub
uses two focused density detectors to compute borehole
compensated density real time while logging. This logging
tool also measures the amplitude of the returning gamma
pulses using a photoelectric reader in order to determine
lithology directly. It can distinguish between sandstone,
limestone, dolomite, shale, and other rocks in the form of an
additional logging curve. Additionally, the tool also records
caliper readings. It requires the use of the 4000 Stack Gamma
Ray Tool Sub, which provides the needed telemetry, and is
compatible with the 4175 Stack Neutron Tool Sub.
FEATURES
Properties Measured
1. Caliper:
Motorized, uphole actuated
33.02 cm (13 in.).
Offset (measured from top of Gamma
Ray Tool Sub):
589.79 cm (232.2 in.)
2. Far Density:
2.2 x 10.16 cm (0.875 x 4.0 in.)
35.8 cm (14.1 in.)
spacing Offset: 630.43 cm (248.2 in.)
3. Compensated Density:
Cdl (compensated density log)
offset: 630.43 cm (248.2 in.)
4. Compensation:
Comp (compensation)
offset: 630.43 cm (248.2 in.)
5. Near Density:
2.2 x 3.2 cm (0.875 x1.25 in.)
20 cm (7.9 in.) spacing
Offset: 638.25 cm (251.28 in.)
6. Photoelectric:
2.2 x 3.2 cm (0.875 x1.25 in.)
20 cm (7.9 in.) spacing
Offset: 638.25 cm (251.28 in.)
7. Radioactive Source:
200–300 mCi Cesium 137 bullplug
Offset: 658.62 cm (259.3 in.)
Length: 348.13 cm (137.06 in.)
Temperature: 85 C (185 F)
Diameter: 63.5 mm (2.5 in.)
Pressure: 175 kg/cm2 (2500 psi)
Weight: 58 kg (128 lb.)
Logging Speed: 9 m/min. (30 ft./min.)
TOOL#: 4239
