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Plunger lift installation and maintenance: Difference between revisions
Plunger lift installation and maintenance (view source)
Revision as of 18:07, 7 March 2014
, 7 March 2014→Plunger sensors
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Different types of sensors are available, but most are either acoustic or magnetic. Sensor dependability is imperative when controllers use plunger speed as a criterion for adjusting cycle times. In many cases, sensor failure causes well shut-in by the controller, or well loading and dying. | Different types of sensors are available, but most are either acoustic or magnetic. Sensor dependability is imperative when controllers use plunger speed as a criterion for adjusting cycle times. In many cases, sensor failure causes well shut-in by the controller, or well loading and dying. | ||
Magnetic coil based sensors are susceptible to stray electrical currents, such as those produced by cathodic protection. Such currents may cause erratic sensing of plunger arrivals. Insulating the lubricator and sensor from stray currents caused by cathodic protection or installing capacitance to level current fluctuations can improve performance. | |||
Magnetic coils in plunger sensors have been recently replaced with magnetometers that measure the magnetic field of the earth. An on board microprocessor watches for the changes to the magnetic field and the plunger passes by. This fundamental shift in plunger detection technology has allowed for a adjustable sensitivity, auto calibration, enhanced noise filtering, in field programming, and real time debugging. All of this combines to eliminate false positives/negatives, dramatically improving system performance. | |||
===Motor valves=== | ===Motor valves=== | ||