Patent Number: 6,254,147

Title: Fluid-tight connecting apparatus

Abstract: A fluid-tight coupling (2) for connecting opposite ends of the pipe section (4, 6) to provide a fluid-tight AI seal is described. The fluid-tight seal between the upper and lower tubular sections is provided by an upper and a lower metal-to-metal seal produced respectively between a lower sealing surface (10) of the upper pipe section (4) and an upper sealing surface (12) of an annular interface member (8) and an upper sealing surface (14) of the lower section (6) and a lower sealing surface (16) of the annular interface member (8). The metal-to-metal seals are produced and maintained by a collar (20) arranged coaxially about the coupling region of the tubular sections. The collar (20) is coupled by threads (24, 26) to the upper and lower pipe sections and rotation of the collar (20) in one direction brings the sections (4, 6) together comprising the interface member (8) and deforming at least one sealing surface of each pair of sealing surfaces (10, 12) and (14, 16) to increase the contact area and provide metal-to-metal seals. Embodiments and applications of the invention are described.

Inventors: Edwards; Jeffrey Charles (Scotland, GB)

Assignee: Expro North Sea, Limited

International Classification: E21B 17/02 (20060101); E21B 17/04 (20060101); E21B 17/042 (20060101); F16J 15/08 (20060101); F16L 15/00 (20060101); F16L 15/04 (20060101); F16L 19/02 (20060101); F16L 025/00 ()

Expiration Date: 07/03/2018