Downhole tool with compliant metal-to-metal seal

A method of coupling a downhole tool and a receiving member in a well, the method comprising:

• inserting an insertion member of the downhole tool into the receiving member, the downhole tool comprising a seal assembly being annular and comprising a compliant metal spring and a separate metal cover overlapping at least a portion of an outside of the spring, wherein one end of the cover is fixedly connected to or integral with the insertion member;
• and
• energizing and forming an annular metal-to-metal seal by compressing the seal assembly between the insertion member and the receiving member when inserting the insertion member into the receiving member.

A well structure for a well, comprising:

• a liner located in the well using a liner hanger, the liner hanger comprising a metal receptacle;
• and
• a tieback liner inserted into the receptacle and comprising a seal assembly, the seal assembly being annular and comprising a compliant metal spring and a separate metal cover overlapping at least a portion of an outside of the spring, wherein one end of the cover is fixedly connected to or integral with the tieback liner, the cover and the spring extending radially outward from the tieback liner so as to be compressed when the tieback liner is inserted within the receptacle to form an annular metal-to-metal seal between the tieback liner and the receptacle.