Patent ID: 7025360
Filing Date: 2006-04-11
Classification: E21B,F16L

Abstract:
1. A composite metal sealing ring for sealing between a first and second tubular members, the first tubular member having a first bore and a first conical inner sealing surface, the second tubular member having a second bore and a second conical inner sealing surface, the metal sealing ring comprising: a carbon steel body having a body central bore substantially aligned with the first and second bores of the first and second tubular members; a first conical outer sealing surface on the carbon steel body for sealing with the first conical inner sealing surface; a second conical outer sealing surface on the carbon steel body axially opposing the first conical outer sealing surface for sealing with the second conical inner sealing surface; at least one of a first and second inlay secured to the carbon steel body by welding and comprising one of a stainless steel and a corrosion resistant alloy and defining a respective one of the first and second conical outer sealing surfaces on the carbon steel body, a nominal inlay thickness being less than about 10% of a nominal carbon steel body thickness; and an expansion coefficient of the carbon steel body is less than 6.5E-6 inches/inch/°F., and approximates an expansion coefficient of the first and second tubular members, and an expansion coefficient of the at least one of the first and second inlay does not approximate the expansion coefficient of the first and second tubular members.