MANAGED PRESSURE DRILLING SYSTEM HAVING WELL CONTROL MODE

A method of managing drilling pressures, comprising: measuring a flow rate of a drilling fluid injected into a tubular string extending into a subsea wellbore in a formation; measuring a flow rate of returns from a drill bit disposed on a bottom of the tubular string; comparing the returns flow rate...

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Bibliographic Details
Main Authors GRAYSON, Michael Brian, BOUTALBI, Said
Format Patent
LanguageEnglish
French
German
Published 27.09.2017
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A method of managing drilling pressures, comprising: measuring a flow rate of a drilling fluid injected into a tubular string extending into a subsea wellbore in a formation; measuring a flow rate of returns from a drill bit disposed on a bottom of the tubular string; comparing the returns flow rate to the drilling fluid flow rate to detect a kick; exerting backpressure on the returns using a first variable choke valve. The method further comprises, in response to detecting the kick: closing a blowout preventer of a subsea pressure control assembly (PCA) against the tubular string; and diverting the flow of returns from the PCA, through a choke line having a second variable choke valve, and through the first variable choke valve.
Bibliography:Application Number: EP20130752783