Tension tubing hanger and method of applying tension to production tubing

A wellhead assembly, comprising:

• a tubular wellhead with a bore, a sidewall, and a fluid passage through the sidewall;
• a tubular outer tubing hanger member landed in the bore of the wellhead, the outer tubing hanger member having a bore with an axis;
• a tubular inner tubing hanger member having an engaged position in the bore of the outer tubing hanger member, the inner tubing hanger member having a sidewall;
• an axial fluid passage extending axially within the sidewall of the inner tubing hanger member in communication with the fluid passage of the wellhead for delivering fluids below the wellhead assembly;
• at least one shelf in the bore of the outer tubing hanger member, the shelf extending less than a full circumference, defining an axially extending slot;
• at least one flange on the exterior of the inner tubing hanger member, the flange having a circumferential extent less than a circumferential extent of the slot;
• wherein
• the inner tubing hanger member moves from an engaged position to an unengaged position allowing the inner tubing hanger member to be lowered axially relative to the outer tubing hanger member when the inner tubing hanger member is rotated in a first direction relative to the outer tubing hanger member;
• and wherein
• the inner tubing hanger is returned to the engaged position when the inner tubing hanger member is raised axially relative to the outer tubing and rotated in a second direction relative to the outer housing tubing member.

A method for supporting production tubing, comprising:

• (a) positioning a tubular inner tubing hanger member in a bore of a tubular outer tubing hanger member in an engaged position to define a tubing hanger assembly;
• (b) landing the tubing hanger assembly in a bore of a wellhead;
• (c) rotating the inner tubing hanger member while the outer tubing hanger member remains stationary with the wellhead, to operate a retaining mechanism and move the inner tubing hanger from an engaged position to an unengaged position;
• (d) lowering the inner tubing hanger member relative to the outer tubing hanger member;
• and
• (e) returning the inner tubing hanger member back to the engaged position and tensioning a string of production tubing that is secured to the inner tubing hanger member.