DETECTION OF POSITION OF A PLUNGER IN A WELL

摘要

A system for detecting when a plunger (110) reaches a bottom of a well includes a pressure sensor configured to measure a pressure of the well (100) and provide a measured pressure output. Derivative calculation circuitry (300) calculates a derivative of the measured pressure output. Detection circuitry (330) detects when the plunger (110) reaches the bottom of the well based upon the calculated derivative.