Packoff Sealing Assembly

A seal assembly for sealing a space between an inner well member and an outer well member, the seal assembly comprising:

• a packoff body;
• a pair of seals configured for positioning between the packoff body and the inner and outer well members, the seals having U-shaped cross-sections, each with a packoff body leg and a well component leg extending downwardly from a transverse connecting section, the well component legs of the seals being elastically bendable so as to resist inward deflection toward the packoff body, and to enable the seals to be set without the use of an energizing ring;
• the packoff body legs configured to threadedly engage the packoff body;
• and
• the well component legs having a sealing surface configured to mate with, and seal against, the sealing surface of the inner or outer well component.

A seal assembly for sealing the space between a wellhead and a casing hanger, the sealing assembly comprising:

• a packoff body configured for insertion between the wellhead and the casing hanger;
• a pair of annular metal seals for sealing between the packoff body and the wellhead and casing hanger, the pair of annular metal seals each having a U-shaped cross-section including a packoff body leg and a well component leg extending substantially downward from a transverse connecting section, the well component leg having a sealing surface configured for sealing engagement with the wellhead or the casing hanger, the well component leg being elastically bendable so that it resists inward deflection toward the packoff body and so that the pair of annular metal seals can be set without the use of an energizing ring;
• a pair of wiper rings attached to the packoff body below the pair of annular metal seals and configured to contact and wipe clean the surfaces of the wellhead and the casing hanger as the seal assembly is inserted therebetween;
• a retainer plate attached to the bottom of the packoff body and extending radially outward therefrom to retain the position of the pair of annular metal seals and the pair of wiper rings relative to the packoff body;
• and
• a pair of upper elastomeric seals positioned above the annular metal seals and configured to seal between the packoff body and the wellhead and casing hanger and to isolate the pair of seals from pressure above the upper seals.