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1. (WO2018081627) PLUNGER LIFT STATE ESTIMATION AND OPTIMIZATION USING ACOUSTIC DATA

Pub. No.:    WO/2018/081627    International Application No.:    PCT/US2017/058858
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Sat Oct 28 01:59:59 CEST 2017
IPC: E21B 47/008
Applicants: KELVIN INC.
Inventors: BANGOR, David
DUFFY, Logan
GUETZ, Adam
JACKSON, Tim
Title: PLUNGER LIFT STATE ESTIMATION AND OPTIMIZATION USING ACOUSTIC DATA
Abstract:
A method of probabilistically estimating a velocity of a plunger of a beam pump may comprise continuously monitoring well acoustics using a plurality of passive acoustic sensors attached to external structures of the beam pump; digitizing outputs of the plurality of passive acoustic sensors and sending the digitized outputs to a computing device for storage and processing; and using the digitized outputs of the plurality of passive acoustic sensors, estimating a probability of the velocity of the plunger using a hidden Markov model (HMM) to represent a probability of a position and the probability of the velocity of the plunger, the HMM comprising a state space model and an observational model.