Patent ID: 11920431
Assignee: INTERWELL NORWAY AS
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 18:
19. The method according to claim 15, wherein the production tubing system comprises:
the production tubing sub comprising:
the housing comprising a longitudinal through bore, the longitudinal through bore being configured to be provided in fluid communication with the through bore of the production tubing;
the opening provided radially in the housing; and
the valve assembly secured to the opening of the housing, the valve assembly comprising:
a fluid communication channel providing fluid communication from an outside of the housing to the longitudinal through bore of the housing;
a flapper valve device comprising a flapper element configured to be in a closed position in which the fluid communication channel is closed and an open position in which the fluid communication channel is open, the flapper element being biased to the closed position;
a flapper element supporting device configured to support the flapper element when the flapper element is in the open position; and
a securing device for securing the flapper valve device and the flapper element supporting device to the opening, the securing device comprising a through bore forming a first part of the fluid communication channel.