| 摘要 |
<p>The invention includes tubular connections that include a box member having an internal thread, an outer sleeve disposed about the box member and a bonding layer bonding the outer sleeve to the box member. This connection is particularly useful to radially-expandable tubular connections used in the oil and gas exploration industry and is useful for preventing a crack to propagate through the protective sleeve into the box member, especially when the tubular connection is undergoing radial expansion. The bonding material may include an adhesive, a retaining compound, an anaerobic cure adhesive, solder, brazing metal, weld material or combinations thereof. To provide a bonding layer that blunts or arrests crack propagation before a crack reaches the box member, the bonding layer has a bonding strength that is less than a threshold crack-propagating bonding strength, which is about one-fifth of the cohesive strength of the box member.</p> |
