Patent ID: 6273474
Filing Date: 2001-08-14
Classification: E21B,F16L

Abstract:
A corrosion-resistant, threaded connection assembly, comprising:a first tubular member comprising an outer metal tube of corrosion-prone material and an inner metal tubular lining of corrosion-resistant material, said outer tube having a first end and a second end, said first tubular member comprising a first pin connection on said first end, said first pin connection comprising a first nose portion comprising a first ring of corrosion-resistant material secured to said first end of said tube of corrosion-prone material, a first annular securing locus formed between said first ring and said first end of said tube, said first ring defining an annular, axially facing, first end surface, said first pin connection further including a first radially outwardly facing, annularly extending, thread-free pin shoulder formed on said first ring and a first axially extending, externally threaded portion providing male threads formed at least partially on said tube and extending axially inwardly of said first pin shoulder, said first securing locus being disposed intermediate said first end surface and the end of said first externally threaded portion distal said first end surface;a second tubular member comprising a metal coupling having a first end and a second end, said coupling having a first box connection formed in said first end and a second box connection formed in said second end, said coupling including an internally disposed, annularly extending section of corrosion-resistant material disposed intermediate said first and second ends of said coupling, each of said box connections comprising a radially inwardly facing, annularly extending box shoulder formed on said section of corrosion-resistant material, each of said box connections further including an axially extending, internally threaded portion providing female threads complementary to said male threads and extending axially outwardly of said thread-free box shoulder; andsaid pin and box shoulders being sized and configured such that when respective ones of said first pin connections are threadedly received in said first and second box connections, said pin and box shoulders are in metal-to-metal sealing engagement.