Rotationally actuated collet style tubular connection

A subsea riser assembly comprising:

• a first tubular member having a central bore with an axis and an end with outer diameter grooves formed on an outer diameter portion of the first tubular member end;
• a collet landed in an initial position on an upward facing collet shoulder formed on the outer diameter of the first tubular member end, the shoulder axially below the first tubular member end outer diameter grooves;
• wherein the collet has lower inner diameter collet grooves formed on an inner diameter lower portion of the collet partially engaged with the outer diameter grooves of the first tubular member in the initial position, upper inner diameter collet grooves formed on an inner diameter upper portion of the collet, and outer diameter collet threads formed on an outer diameter portion of the collet that extend the axial length of the collet;
• wherein the collet is radially contractible from the initial position to a made-up position;
• an outer annular sleeve having sleeve threads formed on an inner diameter surface of the outer annular sleeve, the sleeve threaded onto the outer diameter collet threads in the initial position;
• a second tubular member having a central bore and an axis coaxial with the first tubular member central bore and axis, the second tubular member having an end with outer diameter grooves formed on an outer diameter portion of the second tubular member end inserted into the collet so that the outer diameter grooves on the first tubular member end and the outer diameter grooves on the second tubular member end are adjacent to the lower and upper inner diameter grooves of the collet, respectively, in the initial position;
• wherein a rotation of less than 360° of the outer annular sleeve relative to the collet causes the collet to move to the made-up position;
• wherein the threads on the outer diameter of the collet are partially engaged with the inner diameter threads of the outer annular sleeve in the made-up position so as to retain the collet in the made-up position;
• and
• wherein the upper and lower inner diameter grooves of the collet engage the outer diameter grooves of the first and second tubular member ends, thereby securing the first tubular member to the second tubular member in the made-up position.

A subsea riser assembly comprising:

• an upper tubular member having an end;
• a lower tubular member having an end, the lower tubular member coaxial with the upper tubular member;
• wherein the upper tubular member end is proximate to the lower tubular member end;
• a radially contractible collet having a downward facing shoulder on an inner diameter upper end and an upward facing shoulder on an inner diameter lower end;
• the upper tubular member having an upward facing shoulder on an end of the upper tubular member in contact with the downward facing shoulder on the upper end of the collet;
• the lower tubular member having a downward facing shoulder on an end of the lower tubular member in contact with the upward facing shoulder on the lower end of the collet;
• a lower portion of the collet partially engaged with the lower tubular member in the initial position;
• wherein the collet has threads on an outer diameter of the collet;
• an outer sleeve having threads on an inner diameter that fully engage the threads on the outer diameter of the collet in the initial position;
• wherein rotation of the outer sleeve and collet relative to each other causes the collet to fully engage the downward facing collet shoulder with the upward facing shoulder of the upper tubular member and the upward facing collet shoulder with the downward facing shoulder of the lower tubular member;
• and
• wherein the rotation causes the outer sleeve thread to move from a fully engaged position to a partially engaged position, thereby retaining the collet in a made up position that secures the lower tubular member to the upper tubular member.

A subsea riser assembly comprising:

• an upper tubular member having an end;
• a lower tubular member having an end with a plurality of box end fingers separated by slots, the lower tubular member coaxial with the upper tubular member;
• wherein the end of the upper tubular member is inserted into the end of the lower tubular member;
• wherein grooves are formed on an outer diameter of the upper tubular member end;
• wherein grooves are formed on an inner diameter of the lower tubular member end so that the grooves of the upper tubular member are proximate to the grooves of the lower tubular member when the upper tubular member is inserted into the end of the lower tubular member;
• a radially contractible split collet ring partially engaged with the end of the lower tubular member while in an initial position;
• wherein the split collet ring has threads on an outer diameter of the split collet member;
• an outer sleeve having threads on an inner diameter that fully engage the threads on the outer diameter of the split collet ring in the initial position;
• wherein rotation of the outer sleeve relative to the split collet ring causes the outer sleeve thread to move from a fully engaged position to a partially engaged position, thereby causing the split collet ring to contract radially and the box end fingers to contract radially;
• and
• the radial contraction of the box end fingers causes the grooves on the end of the upper tubular member to fully engage the grooves on the end of the lower tubular member, thereby securing the upper tubular member to the lower tubular member.