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1. (WO2017155788) POSITION SENSING FOR WELLSITE PUMPING UNIT

Pub. No.:    WO/2017/155788    International Application No.:    PCT/US2017/020478
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: F15B 15/28
E21B 43/12
Applicants: WEATHERFORD TECHNOLOGY HOLDINGS, LLC
Inventors: ROBISON, Clark, E.
SABHAPATHY, Peri
THOMAS, Benson
Title: POSITION SENSING FOR WELLSITE PUMPING UNIT
Abstract:
A hydraulic pumping system for use with a subterranean well can include an actuator with a displaceable actuator member, a magnet device that displaces with the actuator member, the magnet device including at least one permanent magnet positioned between low magnetic permeability elements, and a sensor that senses a magnetic flux propagated from the magnet device. The actuator can include a cylinder, and the sensor can include an outer tube, with materials of the cylinder and outer tube having substantially a same magnetic permeability. An enclosure can be positioned exterior to the cylinder, with the sensor being positioned at least partially in the enclosure. The enclosure can be configured to focus the magnet flux, so that it propagates to the sensor.