Patent ID: 11933111
Assignee: TUBACEX UPSTREAM TECHNOLOGIES S.A.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 9:
10. Threaded joint for oil pipes, the joint comprising a female part and a male part, wherein a coupling direction between the male part and the female part and a coupling configuration are defined, the male part having a nose, wherein the female part is a joint tubular body comprising a coupling section which internal surface is threaded, an axis of the tubular body having the coupling direction, a seal section which prolongs the coupling section in the coupling direction with a decreasing diameter in the coupling direction, the seal section having an internal sealing surface and a shoulder at the end of the seal section for abutting the nose of the male part in the coupling configuration and wherein the male part comprises a tubular body which comprises a first section which external surface is threaded and which is complementary to the threaded internal surface of the female part, a second sealing section comprising a seal surface which in the coupling configuration cooperates with the seal surface of the female part for sealing the joint, the nose which in the coupling configuration abuts on the shoulder, wherein
the seal surface of the male part is made of a proximal conical section closer to the thread, and a distal section closer to the male part nose;
the internal sealing surface of the female part comprises a proximal section portion closer to the thread and a distal section portion closer to the shoulder;
the proximal section portion of the female part being a conical surface which forms, in the coupling configuration, a first seal with the proximal conical section of the male part, the proximal section portion and the proximal conical section having different cone angles;
the distal section portion of the female part having a convex surface which forms, in the coupling configuration, a second seal with the distal section of the male part;
such that in the coupling configuration a double seal formed by the first seal and the second seal is established, the first seal being a cone to cone seal that can prevent ingress from external pressure, the second seal being a convex to cone seal.