A downhole tubular apparatus, comprising: a first tubular member; a second tubular member; a threaded connection coupling the first and second tubular members; axial slits formed in the second tubular member, the axial slits configured to facilitate plastic deformation of the second tubular member and thereby release the threaded connection in response to plastic deformation of the second tubular member caused by an expansion cone coupled to the second tubular member; a metal-to-metal seal between the first and second tubular members; a pin end extending from the first tubular member, the pin end comprising: an internal shoulder disposed at an extremity of the pin end; a threaded portion; an intermediate shoulder portion having an outer Z profile and disposed between the internal shoulder and the threaded portion; a nose extension portion extending axially from the intermediate shoulder portion toward the internal shoulder; and a sealing portion partially forming the metal-to-metal seal and disposed between the nose extension portion and the internal shoulder; a box end extending from the second tubular member, the box end comprising: a corresponding threaded portion a sealing portion partially forming the metal-to-metal seal; an intermediate shoulder portion having an inner Z profile; a pre-expanded portion disposed between the intermediate shoulder portion and the sealing portion, wherein the pre-expanded portion has an inner surface radially outward relative to innermost surfaces of the sealing and the intermediate shoulder portions; and an internal shoulder disposed proximate the sealing portion. a first tubular member; a second tubular member; a threaded connection coupling the first and second tubular members; axial slits formed in the second tubular member, the axial slits configured to facilitate plastic deformation of the second tubular member and thereby release the threaded connection in response to plastic deformation of the second tubular member caused by an expansion cone coupled to the second tubular member; a metal-to-metal seal between the first and second tubular members; a pin end extending from the first tubular member, the pin end comprising: an internal shoulder disposed at an extremity of the pin end; a threaded portion; an intermediate shoulder portion having an outer Z profile and disposed between the internal shoulder and the threaded portion; a nose extension portion extending axially from the intermediate shoulder portion toward the internal shoulder; and a sealing portion partially forming the metal-to-metal seal and disposed between the nose extension portion and the internal shoulder; an internal shoulder disposed at an extremity of the pin end; a threaded portion; an intermediate shoulder portion having an outer Z profile and disposed between the internal shoulder and the threaded portion; a nose extension portion extending axially from the intermediate shoulder portion toward the internal shoulder; and a sealing portion partially forming the metal-to-metal seal and disposed between the nose extension portion and the internal shoulder; a box end extending from the second tubular member, the box end comprising: a corresponding threaded portion a sealing portion partially forming the metal-to-metal seal; an intermediate shoulder portion having an inner Z profile; a pre-expanded portion disposed between the intermediate shoulder portion and the sealing portion, wherein the pre-expanded portion has an inner surface radially outward relative to innermost surfaces of the sealing and the intermediate shoulder portions; and an internal shoulder disposed proximate the sealing portion. a corresponding threaded portion a sealing portion partially forming the metal-to-metal seal; an intermediate shoulder portion having an inner Z profile; a pre-expanded portion disposed between the intermediate shoulder portion and the sealing portion, wherein the pre-expanded portion has an inner surface radially outward relative to innermost surfaces of the sealing and the intermediate shoulder portions; and an internal shoulder disposed proximate the sealing portion.