Metal-to-metal packer seal for downhole disconnectable pipe joint

In an elongated pipe string comprised of interconnectable pipe lengths which, when engaged, form separable upper and downhole pipe segments, for conducting a treating fluid into a subterranean well, said pipe string including a separable metal-to-metal seal joint adapted to fluid tightly engage said upper and downhole segments, and which is resistant to corrosive deterioration when exposed to a corrosive atmosphere caused by said treating fluid,

• the downhole segment of said pipe string having an upwardly facing end receptacle which defines at least one frusto-conical sealing surface, and a gasket deflecting surface, intersecting said at least one frusto-conical sealing surface,
• the upper segment of said pipe string having a connector at the lower end thereof aligned in axial registry with said upwardly facing end receptacle, and having a peripheral seal area having means to form a first metal-to-metal ring of contact with a portion of said at least one frusto-conical sealing surface, to define an annular extrusion compartment at each opposite side of the said first metal-to-metal ring of contact, between spaced apart contiguous surfaces of the connector and the end receptacle,
• at least two gaskets comprised of an extrudable metal, each of which substantially occupies each of said annular extrusion compartment to form second metal-to-metal annular seals compressed between the pipe string upper segment, and the pipe string downhole segment.