公开(公告)号：CA2875794C

公开(公告)日：2017-10-24

申请号：CA2875794

申请日：2013-06-07

Applicant: WEATHERFORD/LAMB INC

Inventor： TEODORESCU SORIN GABRIEL ,  BIRSE SCOTT D ,  ODELL ALBERT C II

IPC: F04C2/107 ,  E21B4/02 ,  E21B47/01

Abstract: A tachometer for a downhole motor includes: a tubular housing having a coupling for connection to a housing of the motor; and a probe. The probe: has a coupling for connection to a rotor of the motor, is movable relative to the tachometer housing, and has at least a portion disposed in a bore of the tachometer housing. The tachometer further includes electronics disposed in the tachometer housing and including: a battery; one or more proximity sensors for tracking an orbit of the probe; and a programmable logic controller (PLC). The PLC is operable: to receive the tracked orbit, and at least one of: to determine an angular speed of the probe using the tracked orbit, and to forecast a remaining lifespan of the motor using the tracked orbit.