Walter Phillips, WANSCO
Lynn Rowlan, Echometer
The Polished Rod Transducer (PRT) is a practical and effective tool for well analysis, offering the ability to acquire dynamometer data quickly with minimal disruption to pumping operations. This paper provides guidance on best practices for obtaining reliable PRT readings and improving diagnostic accuracy.
The paper begins with a brief overview of how the PRT measures load through polished rod diameter change. It then addresses key factors that can affect data quality, including transducer temperature equalization, PRT orientation, and polished rod alignment. Practical recommendations are provided for field application, such as installing the PRT early to allow temperature stabilization before data acquisition.
A key finding presented in this paper is that thermal drift, particularly from sun exposure during acquisition, can produce data trends that may be misinterpreted as polished rod bending. These thermal effects are visually distinguishable from actual mechanical issues once the operator knows what to look for. Recognizing this distinction adds a valuable diagnostic skill to the operator's toolkit.
This paper will help operators and engineers get more value from PRT analysis by understanding both its capabilities and the conditions that influence its readings.