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Century Geophysical LLC
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Century Geophysical - Model 4239 -Express Stack In-Line Litho Density Tool

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The Series 4239 In-Line Litho-Density Tool employs two focused density detectors to compute borehole compensated density in real time while logging operations are underway. It further utilizes a photoelectric reader to measure the amplitude of returning gamma pulses, allowing for direct lithology determination. This tool can differentiate between various rock types such as sandstone, limestone, dolomite, shale, and others, represented as an additional logging curve. It also provides caliper readings. The tool necessitates the use of the 4000 Stack Gamma Ray Tool Sub for required telemetry functions and is compatible with all other Express Stack™ Tools except the 4841(DIL). The tool is fully digital, supports quick automatic setup, possesses a unique tool identification, requires assembly at the well site, and can be customized to meet specific needs. Specifications include a length of 348.13cm, an operating temperature of 125°C, a diameter of 6.35cm, pressure tolerance of 350kg/cm2, and a logging speed of 9m/min.

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The Series 4239 In-Line Litho-Density Tool sub uses two focused density detectors to computer borehole compensated density real time while logging.  This 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 all other Express Stack™ Tools except for the 4841(DIL). 

  • Fully downhole digital
  • Quick automatic setup, unique tool identification
  • Requires assembly at well site
  • Can be customized to your specific needs

Properties Measured:

  1. Caliper: Motorized, uphole actuated 33.02cm (13 in.) Offset(measured from top of Gamma Ray Tool Sub) 589.79(232.2 in.)

  2. Far Density: x 10.16cm(0.875 x 4.0 in) 35.8cm(14.1 in.) spacing Offset:630.43cm (248.2 in.)

  3. Compensated Density: Cdl (compensated density log) Offset: 630.43cm (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 x 1.25 in.) 20cm(7.9 in.) spacing Offset: 638.25cm(251.28in.)

  6. Photoelectric x 3.2cm(0.875 x 1.25 in.) 20cm (7.9 in.) spacing Offset: 638.25cm(251.28 in.)

  7. Density Source

  • Length: 348.13cm (137.06 in.)
  • Temperature: 125c (257F)
  • Diameter: 6.35cm (2.5 in)
  • Pressure: 350kg/cm2 (5000 psi)
  • Weight: 58 kg (128 lbs.)
  • Logging Speed: 9m/min. (30ft/min.)