COLLAR DETECTOR

Abstract: a plunger assembly includes a plunger body and a collar detecting assembly. the plunger body is disposed within a wellbore string that has multiple collars. the collar detecting assembly includes a housing attached to the plunger body, and spring-loaded pins attached to and extending through a side wall of the housing to bear against an interior wall of the wellbore string. each of the spring-loaded pins momentarily extends at an annular gap formed between two pipes at each collar as the plunger body moves along the pipe. the collar detecting assembly also includes a transducer that converts movement of the spring-loaded pins into electronic signals including timestamps. a transmitter of the plunger transmits the timestamps to a system including one or more computers. the system determines, as a function of the timestamps, a speed of the plunger assembly along the wellbore string.

Inventor(s): Bagus Wahyu Setiadi

CPC Classification: E21B43/121 ({Lifting well fluids (monitoring of down-hole pump systems )})

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