Patent ID: 11891878
Assignee: NINE DOWNHOLE TECHNOLOGIES, LLC
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A barrier valve comprising:
a housing having an outer surface and an inner surface, the inner surface defining a passage through the barrier valve and having a diameter;
an annular cartridge sized to fit concentrically within the passage, the cartridge having an outer surface and an inner surface;
a frangible disc composed of a ceramic material and comprising an annular portion sized to fit concentrically within the annular cartridge and a curved portion that extends outward from one end of the annular portion to block the flow of fluid therethrough, the annular portion having an outer surface with a surface roughness of less than 64 micro inches (rms);
a first elastomeric member between the outer surface of the cartridge and the inner surface of the housing;
a second elastomeric member between the outer surface of the annular portion of the frangible disc and the inner surface of the cartridge; and
a viscous lubricant on the outer surface of the second elastomeric member such that the lubricant penetrates imperfections in the frangible disc in at least the vicinity of the second elastomeric member;
wherein the barrier valve prevents the flow of gas in a direction through the passage for a duration of 15 minutes at a pressure of 10,000 psi and a temperature of 350 degrees F. when the frangible disc, the cartridge, and the elastomeric members are mounted therein;
wherein the lubricant is an oil with a viscosity between 50,000 centistokes and 125,000 centistokes.