초록 ▼

There is provided a protective joint for production tubing having a body portion and an increased diameter portion within a zone to be protected and including a transition ring formation and a plurality of first and second generally cylindrical annular protective rings coaxially locatable with the b

There is provided a protective joint for production tubing having a body portion and an increased diameter portion within a zone to be protected and including a transition ring formation and a plurality of first and second generally cylindrical annular protective rings coaxially locatable with the body portion and the increased diameter portion, respectively. The transition ring formation is located between the first and second protective rings and may include a transition ring, a supporting ring and a compensating ring which are sealingly biased with the protective rings against two retainers by a biasing means to thereby form a protective shield capable of accommodating longitudinal movement of the production tubing relative to the protective joint as well as flexing in the production string.

대표청구항 ▼

A protective joint for tubulars having a body portion with a first diameter and at least one coupling portion connected to the body portion and having an increased diameter portion, at least a part of both the first and increased diameter portions being included within a zone to be protected by the

A protective joint for tubulars having a body portion with a first diameter and at least one coupling portion connected to the body portion and having an increased diameter portion, at least a part of both the first and increased diameter portions being included within a zone to be protected by the protective joint, said protective joint comprising: a plurality of first and second generally cylindrical annular protective rings, said first protective rings being coaxially located along the body portion of the tubular and said second protective rings being coaxially located along the increased diameter portion of the coupling portion, said first and second protective rings having flat and parallel faces, having sufficient inside diameters and being engagable with like protective rings along a plane intersecting the inside longitudinal axis of the tubular to accommodate bending movements along the longitudinal axis of tubular; at least one transition ring formation having first and second flat and parallel faces, said transition ring formation having an inside diameter and outside diameter at its first face approximately equal to the inside and outside diameter, respectively, of the first protective rings and said transition ring formation having an inside diameter and outside diameter at its second face approximately equal to the inside and outside diameter, respectively, of the second protective rings, the exterior surface of said transition ring formation comprising a generally continuous surface from the first face to the second face of the transition ring formation and the interior surface of said transition ring formation being configured to provide a space along the connection between the coupling portion and the body portion of the tubular sufficient to accommodate longitudinal movement of the protective device with respect to the tubular; and biasing means coaxially located along at least some portion of the tubular, said biasing means being engagable at one end with a retainer locatable on the tubular and at the other end with at least one of the protective rings to bias the first and second protective rings and the transition ring formation to thereby form a protective shield along the entire zone to be protected.