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1. (WO2017039458) SYSTEM AND METHOD FOR MONITORING THE STATE OF A CHOKE VALVE IN A MANAGED PRESSURE DRILLING SYSTEM

Pub. No.:    WO/2017/039458    International Application No.:    PCT/NO2016/050181
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: E21B 21/08
E21B 34/02
E21B 44/00
Applicants: STATOIL PETROLEUM AS
Inventors: MANUM, Henrik
LI, Qin
Title: SYSTEM AND METHOD FOR MONITORING THE STATE OF A CHOKE VALVE IN A MANAGED PRESSURE DRILLING SYSTEM
Abstract:
A method of monitoring the state of a choke valve 12 in a managed pressure drilling system 1 using a valve state parameter to represent the state of the choke valve 12, the method comprising: measuring the flow rate of a material across the choke valve 12, measuring the pressure differential of the material across the choke valve 12, obtaining a valve characteristic of the choke valve 12, and calculating the valve state parameter using the flow rate, the pressure differential and the valve characteristic.