Casing string torque transfer and suspension system and method for mandrel casing hangers

A casing string torque transfer and suspension system comprising:

• a running tool threadable to a mandrel casing hanger,
• the mandrel casing hanger comprising:
• a casing string threaded to the mandrel casing hanger and extending below the mandrel casing hanger;
• a plurality of flutes dispersed circumferentially around a flange of the mandrel casing hanger;
• and
• a pair of rotary drive rings extending around an outer diameter of one of the running tool, the mandrel casing hanger or a combination thereof, the pair of rotary drive rings comprising:
• an upper drive ring member pinned to the outer diameter of the running tool;
• and
• a lower driven ring member interlocked to the upper ring member below the upper ring member, the lower driven ring member comprising a set of protruding portions, each protruding portion of the set of protruding portions extending into one of the flutes when the running tool is threaded to the mandrel casing hanger;
• wherein each flute comprises a pair of axially extending walls, and each protruding portion further comprises:
• an axially extending side parallel to a first axially extending wall of the pair of axially extending walls, the axially extending side abuttable against the first axially extending wall such that rotation of the running tool in a first direction transfers torque through the abutment and rotates the casing string;
• and
• a sloping side opposite the axially extending side and spaced from a second axially extending wall of the pair of axially extending walls, such that rotation of the running tool in a second direction disengages the running tool from the mandrel casing hanger;
• and
• further comprising a bevel on a top corner of the second axially extending wall, wherein during rotation of the running tool in the second direction, the sloping side slides along the bevel as the lower driven ring member moves upward.

A casing string torque transfer and suspension system comprising:

• a running tool threadable to a mandrel casing hanger,
• the mandrel casing hanger comprising:
• a casing string threaded to the mandrel casing hanger and extending below the mandrel casing hanger;
• a plurality of flutes dispersed circumferentially around a flange of the mandrel casing hanger;
• a pair of rotary drive rings extending around an outer diameter of one of the running tool, the mandrel casing hanger or a combination thereof, the pair of rotary drive rings comprising:
• an upper drive ring member pinned to the outer diameter of the running tool;
• a lower driven ring member interlocked to the upper ring member below the upper ring member, the lower driven ring member comprising a set of protruding portions, each protruding portion of the set of protruding portions extending into one of the flutes when the running tool is threaded to the mandrel casing hanger;
• a first set of rectangular teeth extending downward from the upper drive ring member, the first set of rectangular teeth interlocking with a second set of rectangular teeth that extend upward from the lower driven ring member;
• and
• a plurality of cushioning members extending axially between the upper drive ring member and the lower driven ring member, the plurality of cushioning members dispersed circumferentially around the pair of rotary drive rings.

A method of rotating a casing string suspended in a downhole well comprising:

• securing a pair of rotary drive rings around an outer diameter of a running tool such that slanted teeth of the rotary drive rings extend into fluid bypass flutes of a mandrel casing hanger when the mandrel casing hanger is threaded to the running tool;
• cushioning a space between the pair or rotary drive rings with a compressible member;
• reciprocating the casing string by using the pair of rotary drive rings to transfer axial loads from the running tool to a casing string suspended below the mandrel casing hanger when the mandrel casing hanger is threaded to the running tool;
• abutting a vertical side of each slanted tooth of the slanted teeth of the rotary drive rings against the fluid bypass flutes to transfer torque from the running tool to the mandrel casing hanger and rotate the casing string in a right-handed direction;
• and
• retracting the pair of rotary drive rings by sliding a slanted side of the slanted teeth upward and away from the fluid bypass flutes to separate the running tool from the mandrel casing hanger when the running tool is rotated in a left-handed direction.