Importance

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Abstract

An oil field tubular connection is provided for joining metallic tubulars at a well site. At least one end of each tubular is provided with a frustoconical external sealing surface for metal-to-metal sealing engagement with a corresponding surface of an adjoining tubular. A plurality of antigalling grooves provided along the external sealing surface each project radially inward thereof and circumferentially encircle the threaded end of the tubular member and seal the groove from fluid communication with the interior of the tubular member. The antigalling grooves are particularly well suited for use with a low angular taper sealing surface of less than approximately 7.degree., and reduce galling between the metal sealing surfaces during makeup of the connection. Each tubular connection may also include an energizing groove spaced axially between the exterior sealing surface and the threads on the tubular member. The energizing groove receives excess thread lubricant, and has a uniform radial depth circumferentially about the tubular member for reducing the cross-sectional thickness of the tubular member, thereby allowing the exterior sealing surface to move radially outward in response to increased tubing pressure and allowing more flexibility for increased interference between the sealing surfaces during makeup of the connection.

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First Claim