Production Inclinometer Accelerometer


Measures the acceleration caused by gravity to determine the well deviation


  • Correction of differential pressure density measurements for  well inclination
  • Interpretation of production log from a horizontal well
  • Identification of major tubular buckling
  • Deconvolution of tool data for unsteady tool movement, such as the yo-yo effect in deviated wells and when running on coiled tubing

Features and Benefits

  • Simultaneous operation with other production logging tools

Tool Description

The Sondex® production inclinometer accelerometer (PIA) measures the acceleration caused by gravity to within a range of ±2 g. Within this is the range of ±1 g, which corresponds to 0 to 180° deviation. From 0 to 90°, the output is equivalent to the cosine of the deviation. The production inclinometer accelerometer can be used to record downhole tool movement for data de-convolution.

Deviation measurement is particularly useful where phase separation occurs within a horizontal well because the relationship between the phases can often be related to the whether a phase is moving uphill or downhill.

The industry-standard, high-resolution, high-temperature sensor of the PIA consists of an arm with a capacitor plate held between a second capacitor plate and an electromagnet. The electromagnet holds the first plate centralized. The capacitance gap is used to monitor the position of the arm. Changes in acceleration because of gravity result in changes of the current required to hold the arm centralized. These changes in current are then converted to frequencies for output.