Gamma Sensors

Model 751F

Focused Gamma Sensor with Vibration Detection
Output: Digital
Model 751F

The Applied Physics Systems Model 751F Focused Natural Gamma Sensor measures the gamma radiation occurring in well bores to detect the presence of porous petroleum reservoirs. T

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The sensors’ scintillation crystal and tungsten shield shields one side of the formation from the gamma sensor, which allows operators to differentiate sands from limestones. This allows operators to determine the downhole lithology and accurately place the well path inside the producing (sand) zone.

The sensors are temperature calibrated to ensure that it is accurate throughout the range.
To operate the sensor, rotation in the drillstring is stopped and the sensor is oriented in a specific direction (usually up or 0° and then down or 180°) and readings are taken to determine if any corrective steering action is necessary to stay within the target zone.

The Model 751F sensor can be used as either a standalone system or in with the Applied Physics Model 750 or 760 directional sensors. Communication with the Model 751F is achieved using a bi- directional TTL serial port. To achieve high gamma sensitivity, a 0.7 inch diameter by 5.3 inches long scintillation crystal is used to detect gamma rays.

The Model751F sensor has a two-axis 50 gee vibration sensor to monitor drilling induced vibration and shock. The vibration sensor is oriented to measure axial and lateral shock and vibration.

Typical Versions (others available)

  • Model 751 Standard
  • Model 751F – Focused Gamma Sensor with Vibration Detection
  • Model 751AZ – Azimuthal Gamma Sensor with Vibration Detection

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