WELLHEAD SEAL DEVICE TO SEAL CASING

摘要

A wellhead seal device forms one or more metal seals in an annular space between inner and outer tubular members such as a rough casing held within aligned casing and tubing heads. An annular metal sealing sleeve has a lower portion seated in the annular space, and an upper portion. The upper portion forms an inner sealing annulus adjacent the outer wall of the inner tubular member. A metal seal ring and a wedge ring are located in the inner sealing annulus. A retaining ring is retained by the upper portion above the wedge ring. Threaded seal energizing members extend through the retaining ring to push downwardly on the wedge ring and compress the metal seal ring radially inwardly to form a metal seal to the inner tubular member and thus seal the inner sealing annulus. The upper portion may form an outer sealing annulus adjacent the outer tubular member to accommodate a seal to the outer tubular member. To seal a rough casing extending through aligned casing and tubing heads, the lower portion of the annular metal sealing sleeve may seal to the casing head and to the casing. The upper portion may have an outer tapered surface to provide an external metal seal to a conical central bore section of the tubing head, and an inner surface to form the inner sealing annulus for an internal metal seal to the casing.