Flexible casing systems and methods

A flexible casing connection, comprising:

• a first casing joint, comprising:
• a first tubular,
• a first male connection formed on a first end of the first tubular, the first male connection comprising an axial length and a plurality of threads formed on a first portion of an external surface of the first male connection less than the axial length of the first male connection, and
• a first female connection formed on a second end of the first tubular opposite the first end, the first female connection comprising an axial length and a plurality of threads formed on a first portion of an internal surface of the first female connection less than the axial length of the first female connection;
• a second casing joint, comprising:
• a second tubular comprising a particular length, a particular diameter, and a second wall thickness,
• a second male connection formed on a first end of the second tubular, the second male connection comprising an axial length and a plurality of threads formed on a first portion of an external surface of the second male connection less than the axial length of the second male connection, and
• a second female connection formed on a second end of the second tubular opposite the first end, the second female connection comprising an axial length and a plurality of threads formed on a first portion of an internal surface of the second female connection less than the axial length of the second female connection, where the plurality of threads of the second female connection are configured to rotate through the plurality of threads of the first male connection to be adjacent a second portion of the external surface of the first male connection exclusive of the first portion of the external surface of the first male connection;
• and
• a sleeve positioned over a portion of each of the first male connection and the second female connection and a radial gap between the first male connection and the second female connection.

A casing joint, comprising:

• a tubular comprising a particular length, a particular diameter, and a first wall thickness;
• a male connection formed on a first end of the tubular, the male connection comprising an axial length and a plurality of threads formed on a portion of an external surface of the male connection less than the axial length of the male connection, the male connection comprising a plurality of slots formed on a first axial surface of the first end of the tubular and a plurality of pegs formed on a second axial surface of the first end of the tubular, the male connection further comprising a non-threaded surface formed on another portion of the external surface of the male connection less than the axial length of the male connection and separate from the portion of the external surface of the male connection that comprises the plurality of threads;
• and
• a female connection formed on a second end of the tubular opposite the first end, the female connection comprising an axial length and a plurality of threads formed on a portion of an internal surface of the female connection less than the axial length of the female connection,
• wherein the portion of the external surface of the male connection that comprises the plurality of threads is at an end of the first end of the tubular, and the non-threaded surface formed on the another portion of the external surface of the male connection is between the plurality of threads and the second end of the tubular.

A casing joint, comprising:

• a tubular comprising a particular length, a particular diameter, and a first wall thickness;
• a male connection formed on a first end of the tubular, the male connection comprising an axial length and a plurality of threads formed on a portion of an external surface of the male connection less than the axial length of the male connection, the male connection comprising a plurality of slots formed on a first axial surface of the first end of the tubular and a plurality of pegs formed on a second axial surface of the first end of the tubular;
• and
• a female connection formed on a second end of the tubular opposite the first end, the female connection comprising an axial length and a plurality of threads formed on a portion of an internal surface of the female connection less than the axial length of the female connection, the female connection further comprising a non-threaded surface formed on another portion of the internal surface of the female connection less than the axial length of the female connection and separate from the portion of the internal surface of the female connection that comprises the plurality of threads,
• wherein the portion of the internal surface of the female connection that comprises the plurality of threads is at an end of the second end of the tubular, and the non-threaded surface formed on the another portion of the internal surface of the female connection is between the plurality of threads and the first end of the tubular.