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

Claim 0:
1. A well system, comprising:
a drill string positioned in a wellbore drilled into a subterranean zone, the drill string comprising a plurality of tubular segments and a drill bit at its downhole end;
a landing sub connected to a bottom end of one of the plurality of tubular segments, 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
a valve assembly configured to be pumped down the tubular string by fluid flowing in a downhole direction through the tubular string and to land within the landing sub central bore, the valve assembly comprising:
a main body with a valve central bore;
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 configured to block drilling fluid from flowing through the valve central bore when in an unruptured state; and
one or more valve body setting dogs positioned on an outer surface of the main body and configured to lock into the landing sub locking profile and thereby limit axial movement of the main body within the landing sub, wherein the system is configured such that, during drilling operations when the rupture disc is in the ruptured state, the valve assembly permits drilling fluid to flow through the valve central bore to the drill bit and prevents fluid flow in the uphole direction from the drill bit through the valve central bore.