Patent ID: 11905791
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 5:
6. A method comprising:
attaching a landing sub to a bottom end of one of a plurality of tubular segments of a drill string, the landing sub comprising a landing sub central bore and a landing sub locking profile on an inner surface of the landing sub central bore and the drill string comprising a drill string at its downhole end;
lowering the drill string into a wellbore drilled into a subterranean zone;
pumping, by a flow of drilling fluid through the tubular string, a valve assembly in a downhole direction through the tubular string until the valve assembly lands within the landing sub central bore and valve body setting dogs positioned on an outer surface of a main body of the valve assembly lock into the landing sub locking profile, wherein the valve assembly comprises:
a flapper configured to pivot between an open position and a closed position, wherein in the closed position the flapper seals against a flapper seat and blocks fluid from flowing in an uphole direction through the valve central bore;
a rupture disc positioned in the valve central bore and configured to rupture in response to an application of a predetermined fluid pressure and to block fluid from flowing through the valve central bore when in an unruptured state;
increasing a fluid pressure of the drilling fluid in the tubular string until the rupture disc ruptures; and

during drilling operations after rupture of the rupture disc, flowing drilling fluid through the valve assembly to the drill bit.