A threaded joint has a sealing ring radially positioned between a pin and a box and axially positioned on a portion of the pin on an opposite side of the threads of the pin from the nose of the pin. The sealing ring has two protruding annular lips positioned at a skewed angle to the longitudinal axi
A threaded joint has a sealing ring radially positioned between a pin and a box and axially positioned on a portion of the pin on an opposite side of the threads of the pin from the nose of the pin. The sealing ring has two protruding annular lips positioned at a skewed angle to the longitudinal axis, two or more radial annular ribs on an external surface, an internal surface, and an at least partly embedded reinforcement ring. When the joint is made up, the sealing ring is in sealing contact with an annular groove of the box by the annular ribs and in sealing contact with the pin by the internal surface. The internal surface of the sealing ring can have a uniform diameter or have radially protruding annular ribs.
대표청구항▼
1. A threaded joint for connecting tubes used in the hydrocarbon industry, the threaded joint having a longitudinal axis extending in a proximal direction and in a distal direction opposite to the proximal direction, the threaded joint comprising: a threaded pin;a threaded box comprising an abutment
1. A threaded joint for connecting tubes used in the hydrocarbon industry, the threaded joint having a longitudinal axis extending in a proximal direction and in a distal direction opposite to the proximal direction, the threaded joint comprising: a threaded pin;a threaded box comprising an abutment surface, the pin made up in the box;a sealing ring comprising: a first base comprising a radially inner portion having a first distally extending protrusion,a second face axially opposite to the first base and defining two or more annular lips thereon, the two or more annular lips comprising a first lip and a second lip, the first and second lips intersecting at a valley having a bottom,wherein the first base is distal to the second face and distal to an end of the threaded box,an external cylindrical surface with at least two annular ribs,an internal surface opposite the external cylindrical surface,a groove in the first base that is radially aligned with the valley of the second face such that a line that is parallel with the longitudinal axis of the joint can be drawn through the groove and the bottom of the valley, anda reinforcement ring that is partially embedded in the sealing ring such that an embedded portion of the reinforcement ring is inside the sealing ring and a protruding portion of the reinforcement ring is outside the sealing ring;the reinforcement ring being metal and T-shaped;the reinforcement ring spacing apart the abutment surface and a body of the sealing ring such that the abutment surface and the body do not contact each other in operation of the joint;the reinforcement ring directly contacting the bottom of the groove; andthe reinforcement ring having a cross-section, along an axial plane, that comprises only rectangular shapes;wherein: the sealing ring protrudes radially beyond a radially innermost surface of the protruding portion of the reinforcement ring and a radially outermost surface of the protruding portion of the reinforcement ring,a distalmost portion of the reinforcement ring is distal of a distalmost portion of the first base of the sealing ring,the first distally extending protrusion of the first base of the sealing ring has a distal end that is distal of at least some of the radially innermost surface of the protruding portion of the reinforcement ring,the reinforcement ring is not axially located between the annular lips,the sealing ring is radially compressed between the pin and the box on a non-threaded surface of the pin,the sealing ring is in sealing contact with the box via the at least two annular ribs and is in sealing contact with the pin via the internal surface, andthe pin does not include a radially protruding rib engaged with the sealing ring. 2. A threaded joint according to claim 1, wherein the internal surface of the sealing ring comprises a generally uniform diameter along the longitudinal axis of the sealing ring. 3. A threaded joint according to claim 1, wherein the internal surface is cylindrical. 4. A threaded joint according to claim 1, wherein the internal surface is rounded. 5. A threaded joint according to claim 1, wherein, when the sealing ring is in an uncompressed state, the internal surface is frustoconical with taper of about 3°. 6. A threaded joint according to claim 1, wherein the internal surface of the sealing ring comprises one or more annular ribs. 7. A threaded joint according to claim 1, wherein the sealing ring comprises an elastomeric material. 8. A threaded joint according to claim 1, wherein the first base is substantially flat. 9. A threaded joint according to claim 1, wherein the internal surface of the sealing ring contacts a tapered surface of the pin that tapers toward a nose of the pin, wherein the tapered surface is positioned on the opposite side of the threads from the nose. 10. A threaded joint according to claim 1, wherein the internal surface of the sealing ring contacts a surface of the pin that is parallel to the longitudinal axis of the joint. 11. A threaded joint according to claim 1, wherein the box has an annular groove configured to receive an external portion of the sealing ring after the joint is made up so that the at least two annular ribs of the external cylindrical surface of the sealing ring contact a surface of the groove. 12. A threaded joint according to claim 1, wherein the reinforcement ring has a square cross-section. 13. A threaded joint according to claim 1, wherein the maximum radial thickness of the reinforcement ring is less than the maximum radial thickness of the sealing ring when the sealing ring is compressed between the box and the pin. 14. A threaded joint according to claim 1, wherein a portion of the pin is coated to facilitate slidability of the sealing ring thereupon. 15. The threaded joint according to claim 1, wherein a first portion of the reinforcement ring is positioned inside the groove and a second portion is positioned outside the groove. 16. The threaded joint according to claim 1, wherein, during coupling of the pin and the box, the sealing ring slides longitudinally along and relative to the pin from a first position on the pin to a second position on the pin, wherein the entire longitudinal length of the pin between the first and second positions has a shape that is cylindrical or frustoconical. 17. The threaded joint according to claim 1, wherein the two or more annular lips comprise a first annular lip and a second annular lip, the first lip extending in a first skewed direction relative to the longitudinal axis of the joint and the second lip extending in a second skewed direction relative to the longitudinal axis, the first lip having an inner surface that is generally radially-inwardly facing and the second lip having an outer surface that is generally radially-outwardly facing, wherein: when the sealing ring is uncompressed, the first annular lip extends radially outward of the external cylindrical surface of the sealing ring and the second annular lip extends radially inward of the internal surface of the sealing ring; andwhen the sealing ring is compressed between the pin and the box, the inner surface of the first annular lip and the outer surface of the second annular lip are each configured to move toward each other. 18. The threaded joint according to claim 1, wherein the pin and box define an inside duct and an outside, the joint configured to allow a flow of a hydrocarbon through the inside duct and to be in contact with sea water on the outside. 19. The threaded joint according to claim 1, wherein the annular lips define therebetween at least one substantially V-shaped channel, and the reinforcement ring is not positioned in the channel. 20. The threaded joint according to claim 1, wherein the reinforcement ring is located closer to the first base than the second face. 21. The threaded joint according to claim 15, wherein the radial thickness of the second portion is greater than the radial thickness of the first portion. 22. The threaded joint according to claim 1, wherein the first base of the sealing ring further comprises a radially outer portion having a second distally extending protrusion, the second distally extending protrusion having a distal end that is distal to at least some of a radially outermost portion of the reinforcement ring. 23. A joint comprising: a threaded pin;a threaded box coupled to the threaded pin;a seal ring compressed between the box and the pin, the seal ring comprising: a first axial end configured to contact an abutment on an inner surface of the box, the first axial end being generally planar and extending substantially the entire radial thickness of the seal ring when the seal ring is in an uncompressed state,a plurality of axially-protruding lips extending from a second axial end opposite the first axial end,an external radial surface with a plurality of radially-protruding ribs configured to sealingly contact an inner surface of the box, andan internal radial surface opposite the external surface, the internal radial surface configured to contact an outer surface of the pin; anda reinforcement ring fully embedded in the seal ring, the reinforcement ring being positioned at the radial middle of the radial thickness of the cross-section of the seal ring and closer to the first axial end than the second axial end, the radial thickness of the seal ring being between the external radial surface of the seal ring and the internal radial surface of the seal ring;wherein, when the threaded box is fully coupled with the threaded pin: the entire surface of the box that is in contact with the external radial surface of the seal ring is cylindrical;the entire surface of the pin that is in contact with the internal radial surface the seal ring is frustoconical with a generally constant angle, relative to a longitudinal axis of the joint, that is greater than 1 degree; andthe seal ring further comprises a projection that projects axially beyond the abutment on the inner surface of the box. 24. The joint according to claim 23, the pin further comprising a coating configured to facilitate the slideability of the seal ring. 25. The joint according to claim 23, wherein the angle of the frustoconical portion of the pin, relative to the longitudinal axis of the joint, is less than 15°. 26. The joint according to claim 23, wherein the pin comprises a frustoconical portion and a cylindrical portion, and wherein the internal surface of the seal ring contacts both portions in the course of make up. 27. The joint according to claim 23, wherein the reinforcement ring exerts a compressive force on the internal surface of the seal ring. 28. The joint according to claim 23, wherein the reinforcement ring comprises a material selected from the group consisting of aluminum, copper, nickel, silver, and stainless steel. 29. The threaded joint according to claim 23, wherein the pin does not include a radially protruding rib configured to engage the seal ring. 30. The joint according to claim 23, wherein the pin and box define an inside duct and an outside, the joint configured to allow a flow of a hydrocarbon through the inside duct and to be in contact with sea water on the outside. 31. The joint according to claim 23, wherein: the plurality of axially-protruding lips includes a first lip and a second lip;in an uncompressed state, the first lip and second lip of the seal ring are at first and second skewed angles relative to the longitudinal axis of the joint, and the first and second skewed angles being different; andthe internal radial surface of the seal ring is at an angle relative to the longitudinal axis, the angle of the internal radial surface being less than the second skewed angled of the second lip. 32. The joint according to claim 23, wherein the seal ring is configured to be installed on the pin before the pin is coupled with the box. 33. The joint according to claim 23, wherein the projection is located on a radially innermost portion of the first axial end and protrudes axially relative to a radially middle portion of the first axial end. 34. The joint according to claim 33, wherein, when the seal ring is compressed between the pin and the box, a radially outermost portion of the first axial end substantially does not protrude axially relative to the radially middle portion of the first axial end. 35. The joint according to claim 23, wherein the first axial end is the distalmost end of the seal ring. 36. The joint according to claim 23, wherein, when the threaded box is fully coupled with the threaded pin, the seal ring is not engaged with a radially protruding rib.
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