公开(公告)号：US10370945B2

公开(公告)日：2019-08-06

申请号：US15093954

申请日：2016-04-08

Applicant: Khalifa University of Science and Technology

Inventor： Igor Boiko ,  Mohammad Luai Hammadih ,  Khalifa Hasan Al Hosani

IPC: E21B43/12 ,  G05B13/04 ,  E21B47/00 ,  E21B47/06

Abstract: A method and apparatus for estimating a down-hole annulus pressure, and/or a down-hole tubing pressure, and/or a down-hole lift gas rate through a gas injection valve of gas lift system, which comprises at least one gas lift choke and at least one gas injection valve and at least one production choke. A state estimator is proposed to obtain the values of these down-hole process variables. The estimator contains a number of local estimators and an interpolation module.