公开(公告)号：US10895121B2

公开(公告)日：2021-01-19

申请号：US15756874

申请日：2016-09-02

Applicant: STATOIL PETROLEUM AS

Inventor： Henrik Manum ,  Qin Li

IPC: E21B21/08 ,  E21B21/10 ,  F16K37/00 ,  G01F1/74 ,  G01F15/00 ,  G01L13/00 ,  G01L19/00 ,  G01N9/36

Abstract: A method of monitoring the state of a choke valve in a managed pressure drilling system using a valve state parameter to represent the state of the choke valve includes measuring the flow rate of a material across the choke valve, measuring the pressure differential of the material across the choke valve, obtaining a valve characteristic of the choke valve, and calculating the valve state parameter using the flow rate, the pressure differential and the valve characteristic.