초록 ▼

A pipe couple is shown for connecting two pipelines of different materials together in a well environment which prevents deterioration of the pipe due to galvanic action. The couple achieves its purpose by coating the interior of the more noble pipe section with a wear-resistant, non-conductive coat

A pipe couple is shown for connecting two pipelines of different materials together in a well environment which prevents deterioration of the pipe due to galvanic action. The couple achieves its purpose by coating the interior of the more noble pipe section with a wear-resistant, non-conductive coating which prevents electrolytic action between the two dissimilar metals. It also achieves high pullout resistance while maintaining minimum outer dimensions to facilitate use of the couple in all types of wells including oil, gas and waste injection wells.

대표청구항 ▼

[ What is claimed is:] [1.] A pipe couple for protecting two adjacent sections of pipe of dissimilar metals included in a string of pipe to be suspended from its upper end in a hostile well environment, the pipe string being subject to high differential fluid pressures and electrolytic fluids, the c

[ What is claimed is:] [1.] A pipe couple for protecting two adjacent sections of pipe of dissimilar metals included in a string of pipe to be suspended from its upper end in a hostile well environment, the pipe string being subject to high differential fluid pressures and electrolytic fluids, the couple being assembled prior to inclusion in the string, the couple comprising:two generally aligned tubular elements of dissimilar metals, each of the dissimilar metals being electrolytically compatible with a respective one of the two adjacent sections of pipe being joined in the pipe string, one of the tubular elements making up the pipe couple being of a more noble metal than the other respective tubular element which is formed of a relatively less noble metal;each of the two tubular elements having an outer end which is threaded for connection with a respective one of the two adjacent sections of pipe in the pipe string, and an inner end for joining the other respective tubular element to make up the couple, each of the tubular elements also having a generally cylindrical internal bore which extends for a given length between the outer and inner ends thereof;a nonconductive coating uniformly applied along substantially the entire length of the internal bore of the tubular element formed of the more noble metal and along less than the entire length of the internal bore of the tubular element formed of the relatively less noble metal to inhibit the flow of galvanic induced electrical current between the more noble metal and the relatively less noble metal of the other respective tubular element making up the couple; andwherein the tubular elements making up the pipe couple are connected by a metal to metal seal threaded connection which provides an oxygen free environment within the connection.